JP5782879B2 - Processing device, wireless communication method, and program - Google Patents

Description

  The present invention relates to a processing device, a wireless communication method, and a program, and more particularly, to a processing device, a wireless communication method, and a program related to communication with a wireless terminal.

  In a current wireless communication system, a wireless base station is generally laid at the peak of traffic load. The radio base station always operates even when the traffic load is low. Therefore, in order to reduce the power consumption of the radio base station, a power saving control technique for reducing the transmission power of some of the radio cells or the radio base stations, stopping the transmission, and the like has been studied.

  In order for the wireless terminal to communicate, it is required that the received power and received quality of the reference signal satisfy predetermined values. Therefore, when power saving control is performed in some of the radio cells or radio base stations, it is necessary to accurately estimate a change in radio quality within the coverage of the radio cell or radio base station.

  Patent Document 1 discloses a control method for preventing power saving control from being performed simultaneously on adjacent radio base stations based on the physical distance between the radio base stations. Patent Document 2 discloses a method of reducing the coverage of the own cell by comparing the reception quality from a plurality of radio base stations using the measurement result of the radio quality received from the radio terminal. Here, it is assumed that “Measurement Report” defined by “MeasureResults” in Section 6.3.5 of Non-Patent Document 1 is used as a wireless quality measurement result. It is described in section 4.1.1.6 in Non-Patent Document 2 that “Measurement Report” is held in the radio base station and notified to the network management apparatus.

  In section 9.1.2.8 of Non-Patent Document 3, it is stipulated that the base station notifies the neighboring radio base stations that the base station shifts to the dormant state when the radio base station is suspended. This notification is defined as “Deactivation Indication”.

JP 2010-226704 A JP 2010-283440 A

3GPP TS36.331 V10.0.0 3GPP TS32.422 V10.2.0 3GPP TS36.423 V10.0.0

  However, the above-described technique has a problem that power saving cannot be achieved sufficiently. The problem is detailed below.

  The method described in Patent Document 1 will be described in detail. In this method, a radio base station that performs power saving control is selected according to the distance between the radio base stations calculated based on the position information of the radio base station. Then, the absolute value of the rate of decrease in transmission power at the radio base station and the absolute value of the rate of increase in transmission power at the surrounding radio base stations are controlled to match. However, in areas where the propagation environment is complex, the distance between radio base stations does not necessarily have a strong correlation with the propagation loss. Therefore, a problem arises when power saving control is performed according to only the physical distance between radio base stations without considering the propagation environment. Specifically, there is a risk that adjacent wireless base stations having complementary coverage will be simultaneously selected as targets for power saving control, and there is a risk that the rate of increase in transmission power at the peripheral wireless base stations will be insufficient. When such a problem occurs, it is not possible to compensate for the deterioration in radio quality associated with power saving control, and an area where communication is impossible occurs.

  Furthermore, the method of Patent Document 1 does not consider the increase in transmission power of a radio base station located around the radio base station that performs power saving control. For this reason, power consumption may increase significantly in neighboring radio base stations. For this reason, there is a risk that power is not sufficiently reduced in the entire communication system.

  Next, the method described in Patent Document 2 will be described in detail. In this method, based on the measurement result of the radio quality transmitted from the radio terminal, the power saving control of the cell is autonomously performed only when the radio quality within the coverage of the processing target cell satisfies a predetermined value. Yes. In general, power saving control is performed in a time zone when the traffic load is low. The timing at which power saving control is possible is limited due to the restrictions on the measurement period of traffic load for each radio cell and the measurement period for ensuring the reliability of radio quality. Therefore, it is difficult to perform power saving control for all wireless cells that have limited control timing and can perform power saving control in the system only by autonomous power saving control for the own cell. For this reason, there is a risk that power is not sufficiently reduced in the entire communication system.

  Non-Patent Document 2 stipulates that a wireless quality measurement result transmitted from a wireless terminal is notified to a network management device or the like that is a higher-level device of the wireless base station. Here, in order to accurately estimate a change in radio quality associated with power saving control, it is necessary to collect sufficient measurement results from all radio cells. Therefore, when the notification method described in Non-Patent Document 2 is used, the increase in signaling and data traffic associated with collection control becomes a problem.

  Non-Patent Document 3 stipulates that, in the suspension control of a wireless base station, the peripheral wireless base station is notified that the own wireless base station shifts to a suspended state. However, Non-Patent Document 3 does not stipulate that information on coverage degradation associated with the suspension control is notified. Furthermore, since changes in radio quality associated with radio base station suspension control are not taken into account, there is a possibility that coverage (an area in which communication is ensured) may deteriorate. Furthermore, when the radio base station autonomously determines the suspension control, an appropriate radio base station may not be a target of power saving control. In this case, the number of radio base stations that can be suspended may decrease, and power may not be sufficiently reduced.

  The present invention has been made in view of the above-described problems of the technology, and a processing apparatus and wireless communication capable of suppressing deterioration in wireless quality as much as possible and efficiently saving power as the entire wireless communication system. The main purpose is to provide a method and a program.

One aspect of the processing apparatus according to the present invention is as follows.
Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
Power saving target selection means for selecting the wireless cell set to be subjected to power saving control based on a wireless quality estimation result when the power saving control is performed.

One aspect of the wireless communication control method according to the present invention is:
A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
And a power saving target step of selecting the wireless cell set to be subjected to power saving control based on a wireless quality estimation result when power saving control is performed.

One aspect of the program according to the present invention is as follows:
On the computer,
A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
And a power saving target step of selecting the wireless cell set to be subjected to power saving control based on a wireless quality estimation result when power saving control is performed.

One aspect of the communication system according to the present invention is:
A communication system comprising a first device and a second device that can communicate with each other,
Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
The notification means for notifying the wireless base station or the network management device of the estimation result of the wireless quality when the power saving control is performed and the power saving control based on the estimation result of the wireless quality when the power saving control is performed A power saving target selecting means for selecting a wireless cell set,
The measurement control means, the wireless quality estimation means, the notification means, and the power saving target selection means are provided in either the first device or the second device.

  According to the present invention, it is possible to provide a processing device, a wireless communication method, and a program that can suppress degradation of wireless quality as much as possible and can efficiently save power as the entire wireless communication system.

1 is a block diagram showing a configuration of a wireless communication system according to a first exemplary embodiment. 1 is a block diagram showing a configuration of a radio base station according to a first exemplary embodiment. It is a figure which shows the structure of the base station information concerning Embodiment 1. FIG. FIG. 3 is a diagram illustrating measurement information transmitted from the wireless terminal according to the first embodiment. It is a figure which shows the structure of the radio | wireless quality statistical information concerning Embodiment 1. FIG. It is a figure which shows the structure of the radio | wireless quality statistical information concerning Embodiment 1. FIG. 3 is a flowchart showing a flow of processing of the radio base station according to the first exemplary embodiment; 10 is a flowchart showing a flow of processing of a wireless quality estimation unit according to the third exemplary embodiment. 5 is a pie chart showing a switching ratio of wireless terminals when power saving control is performed on a cell X. FIG. 6 is a block diagram showing a configuration of a radio base station according to a fourth exemplary embodiment. 10 is a flowchart showing a flow of processing of a traffic load estimation unit according to the fourth exemplary embodiment. 10 is a flowchart showing a flow of processing of a power saving target selection unit according to the fifth exemplary embodiment; 14 is a flowchart showing a flow of processing of a wireless quality estimation unit according to the sixth exemplary embodiment. It is a block diagram which shows the hardware structural example of the computer system for implement | achieving the wireless base station concerning this invention.

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless communication system according to the present embodiment. A network management apparatus 103 is arranged in the wireless communication system. The network management apparatus 103 is connected to the core network 101 and the wireless access network 102 via wired links 112 and 113. The network management apparatus 103 manages the communication state of the network, and performs maintenance and operation according to the state.

  The radio base stations 120, 121, and 122 manage the radio cells 140, 141, 142, respectively. Note that the radio base station may manage a plurality of radio cells. The number of radio base stations arranged can be an arbitrary number.

  The radio terminals 130 to 133 communicate via a radio link with the radio base station 120 (121) that manages the radio cell 140 (or 141) to which the radio terminal is connected. The wireless terminals 130 to 133 have a function of measuring wireless quality, and measure the wireless quality periodically or according to an arbitrary measurement trigger. The wireless terminals 130 to 133 transmit the measured wireless quality to the connected wireless base station. Although four wireless terminals are shown in FIG. 1, the number of wireless terminals belonging to the wireless cell is an arbitrary number.

  In the following description, in order to facilitate understanding, it is assumed that the radio base stations (120, 121) perform all the estimation processing (details will be described later) of radio quality and traffic load accompanying power saving control. To do. It is estimated that the network management apparatus 103 only holds long-term operation data. Note that the network management apparatus 103 may perform the above-described estimation process when an increase in signaling and data traffic is not a problem when collecting measurement results of wireless quality from wireless terminals.

  FIG. 2 is a block diagram showing the configuration of the radio base station 120. The radio base stations 121 and 122 have the same configuration. The radio base station 120 includes a base station information storage device 200, a radio quality statistical information storage device 201, a transmission / reception unit 210, a measurement control unit 211, a radio quality estimation unit 212, and a power saving target selection unit 213. Prepare.

  The base station information storage device 200 is a storage device that stores base station information 300 created based on information of each adjacent radio base station input from the transmission / reception unit 210. FIG. 3 is a diagram illustrating an example of the configuration of the base station information 300. The base station information 300 includes a base station ID 301, a cell ID 302, a traffic load 303, a maximum transmission power 304, and an antenna configuration 305. As illustrated, the antenna configuration 305 includes, for example, a height, a directivity pattern, an azimuth angle, and an elevation angle.

  The value of the traffic load 303 indicates the traffic load of each radio cell per unit time transmitted from the adjacent radio base stations 121 and 122. The value of this traffic load 303 is transmitted directly from the adjacent base station or transmitted from the network management apparatus 103 and updated. When the set value is changed, the maximum transmission power 304 and the antenna configuration 305 are directly transmitted from the adjacent radio base station or transmitted from the network management apparatus 103 and updated.

  The description of FIG. 2 will be made again. The transmission / reception unit 210 is a processing unit that communicates with adjacent wireless base stations and wireless terminals 130 and 131. Specifically, the transmission / reception unit 210 receives measurement information 310 (to be described later), transmits information in the wireless quality statistical information storage device 201, and the like.

  The measurement control unit 211 collects wireless quality measurement results from the wireless terminals (130, 131) via the transmission / reception unit 210. The radio quality measurement results include reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), and desired signal signal power. It includes at least one of signal-to-interference ratio (SIR), signal-to-interference plus noise power ratio (SINR).

  The radio quality estimation unit 212 extracts all radio cell sets (hereinafter referred to as radio cell sets) that can be the target of power saving control, and the radio quality and coverage when the power saving control is performed on each set. It is a processing unit for calculating the deterioration rate. Details will be described below.

  The radio quality estimation unit 212 periodically acquires the traffic load for each radio cell from the base station information storage device 200, and when the radio cells operated with a low traffic load exceed a predetermined ratio, the radio quality after power saving control Estimate quality. First, the radio quality estimation unit 212 acquires the radio quality measurement results transmitted from the radio terminals (130, 131) via the transmission / reception unit 210. Further, the radio quality estimation unit 212 acquires the traffic load for each radio cell configured by the own base station and the adjacent radio base station from the base station information storage device 200.

  With reference to FIG. 4, the measurement result (measurement information 310) of the radio quality transmitted from the radio terminal will be described. As shown in FIGS. 4A and 4B, the measurement information 310 defines a RANK 311, an RSRP value 312, and a cell ID 313. FIG. 4A shows measurement information transmitted from the wireless terminal 130. FIG. 4B shows measurement information transmitted from the wireless terminal 131. As illustrated, a different measurement result is transmitted for each wireless terminal. Further, the contents vary depending on the measurement time and the like.

  In the measurement information 310, the ranks 311 are assigned in the order of the RSRP value 312 (high radio quality). The radio cell corresponding to RANK # 1 is a serving cell of the radio terminal that has transmitted the measurement information 310. Subsequent radio cells corresponding to RANK # 2 to 7 are neighbor cells of the radio terminal that has transmitted the measurement information 310. When power saving control is performed on any of these radio cells, the radio quality (RSRP value in FIG. 4) in the serving cell changes.

  In the example of FIG. 4, the reference signal received power (RSRP value) is used as a measurement value. However, the measurement is not limited to this, and the reference signal received quality (RSRQ) and the received electric field strength (RSSI: Even using the Received Signal Strength Indicator (SIR), Signal to Interference Ratio (SIR), Signal to Interference plus Noise Power Ratio (SINR) good.

  The operation of the radio quality estimation unit 212 will be described again. The wireless quality estimation unit 212 uses the acquired wireless quality measurement results (measurement information 310) and the traffic load for each wireless cell to perform the power saving control on one or more wireless cells (saving cells) A change in radio quality and a traffic load associated with (for example, a radio cell adjacent to) a radio cell that has performed power generation are estimated. Details are described below.

  The radio quality estimation unit 212 creates a radio cell set. For example, the radio quality estimation unit 212 extracts cell IDs ("A" to "G", "X") from the measurement information 310 shown in FIG. 4, and creates all sets (radio cell sets) that can be created therefrom. ("X", "A", "B", "X, A", "X, B", "X, C", "X, A, B", "X, A, C" ,,). The radio quality estimation unit 212 generates radio quality estimation results (radio quality statistical information in FIG. 5 described later) corresponding to each radio cell set. For example, the radio quality estimation unit 212 extracts a radio cell set (“X”), and estimates the radio quality and the number of connection switching of each radio cell when power saving is performed on the radio cell “X”. Here, the number of connection switching indicates the number of wireless terminals that switch the connection to the target wireless cell when power saving is performed on the wireless cell “X”. For example, the connection switching number of the wireless cell “A” is the number of wireless terminals that switch connection to the wireless cell “A” when power saving is performed on the wireless cell “X”. The radio quality estimation unit 212 statistically processes the estimated radio quality and the connection switching number of each radio cell and stores them in the radio quality statistical information storage device 201. Information stored in the wireless quality statistical information storage device 201 will be described later with reference to FIG.

  The statistical information stored in the wireless quality statistical information storage device 201 is appropriately transmitted to the adjacent wireless base station by the transmission / reception unit 210. Note that the statistical information stored in the wireless quality statistical information storage device 201 may be transmitted to the network management device 103 (FIG. 1) by the transmission / reception unit 210.

  FIG. 5 is a diagram showing details of the wireless quality statistical information 400 held by the wireless quality statistical information storage device 201. As a premise of FIG. 5, each wireless terminal transmits an SINR value as measurement information. The radio quality statistical information 400 includes a plurality of SINR statistical information, which is the same as the total number of radio cell sets. In FIG. 5, for convenience of explanation, only SINR statistical information 410 when the radio cell “X” is stopped and SINR statistical information 420 when the radio cells “X” and “A” are stopped are shown. Yes.

  In the SINR statistical information (410, 420), classified SINR values (411, 421), dead zone information (412, 422), and statistical values (413, 423) are defined. Hereinafter, the SINR statistical information 410 will be described.

  The SINR value 411 is divided into a plurality of sections (six sections in FIG. 5). ΒX0 in the dead zone 422 indicates the number of wireless terminals that cannot be connected when power saving control is performed on the wireless cell “X”, in other words, the number of measurement results from wireless terminals that can be connected only to the wireless cell “X”. Show.

  When a wireless terminal connected to the wireless cell “X” performs power saving control on the wireless cell “X”, the connection may be switched to another wireless cell. In general, when the power saving control is performed on the connected wireless cell “X”, each wireless terminal connected to the wireless cell “X” switches the connection to the wireless cell having the second highest wireless quality. . For example, the wireless terminal that has transmitted the measurement information 310 illustrated in FIG. 4A switches the connection to the wireless cell “A” when the wireless cell “X” is suspended. Similarly, the wireless terminal that has transmitted the measurement information 310 illustrated in FIG. 4B switches the connection to the wireless cell “B” when the wireless cell “X” is suspended. The radio quality estimation unit 212 estimates the change in traffic load when the radio cell “X” is suspended based on the measurement information transmitted from each radio terminal.

The radio quality estimation unit 212 estimates the radio quality of each radio terminal from the estimated traffic load. For example, the radio quality estimation unit 212 estimates the SINR value of the radio terminal (1) that switches the connection from the radio cell “X” to the radio cell “A” as “−2.0 dB”. In general, the estimation uses the SINR value of the cell located in RANK # 2 of the measurement information 310 transmitted by the wireless terminal. Radio quality estimation section 212 counts up the value of βA2 from this calculation result. The wireless quality estimation unit 212 calculates the estimated value for all wireless terminals that perform connection switching, and reflects the estimated value in the statistical value 423. The radio quality estimation unit 212 generates SINR statistical information 410 by calculating an estimated value for all radio terminals that perform connection switching. Radio quality estimation section 212 uses the ratio between the total number of reports of measurement information and βX0 as an estimated value of the coverage deterioration rate of radio cell “X”. Furthermore, when a predetermined threshold is provided and the communication quality is not satisfied, it can be determined that the coverage is not satisfied. When the predetermined threshold value is SINR> = − 6 [dB], the radio quality estimation unit 212 uses the following equation to calculate the radio communication system (radio cell “X”) when the power saving control is performed on the radio cell “X”. And the overall coverage deterioration rate of the radio cell related to the radio cell “X”.
(ΒX0 + βA0 + βB0 + βC0 + βD0 + βE0 + ...) / total number of reports

  Note that, as described above, a quality index other than the SINR value may be used as the wireless quality estimation measure after the power saving control. FIG. 6 shows radio quality statistical information 400 calculated based on the estimated value of the RSRP value. The wireless quality statistical information 400 shown in FIG. 6 includes RSRP statistical information 430 when the power consumption control is performed on the wireless cell “X”, and the wireless cells “X”, “A”, “B”, “C”. RSRP statistical information 440 in the case where power consumption is performed on “is shown. Here, when the predetermined threshold is RSRP> = − 118 [dBm], the radio quality estimation unit 212 calculates the coverage deterioration rate of the radio communication system by the same method as described above.

  Of course, reference signal reception quality (RSRQ), received electric field strength (RSSI), desired signal power to interference signal power ratio (SIR), etc. may be used as an estimation measure of radio quality after power consumption control. It is.

  The power saving target selection unit 213 acquires the wireless quality statistical information 400 and the traffic load change rate from the wireless quality statistical information storage device 201. Then, the power saving target selecting unit 213 selects a radio base station that performs power saving based on at least one of the acquired radio quality statistical information 400 and traffic load.

  The power saving target selection unit 213 extracts the coverage deterioration rate from the radio quality statistical information 400, for example. Then, the power saving target selection unit 213 selects, as a power saving control target, a wireless cell set capable of performing power saving control on the largest number of wireless base stations from among the wireless cell sets whose coverage deterioration rate is equal to or less than a predetermined value. The power saving target selection unit 213 may select a radio base station that performs power saving control in consideration of radio quality.

  When the power saving target selection unit 213 selects the base station as a power saving target radio base station, the power saving target selection unit 213 performs power saving control of the base station by a known method.

  The configuration of the radio communication system and the radio base station according to the present embodiment has been described above. The radio base station transmission / reception function (transmission / reception unit 210), the radio terminal transmission / reception function, and the like are good for those skilled in the art of the present invention. Are known. Furthermore, since it is not directly related to the present invention, the detailed description of the configuration is omitted.

  Next, the operation of the radio base station 120 according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing an operation of the radio base station 120 according to the present embodiment.

  The radio quality estimation unit 212 acquires the traffic load for each radio cell from the base station information storage device 200 (S101). Then, the radio quality estimation unit 212 starts radio quality estimation processing after power saving control when radio cells operating at a low traffic load exceed a predetermined ratio (S102: Yes).

  The radio quality estimation unit 212 extracts all radio cell sets that are candidates for power saving control after the radio quality estimation process is started (S103). Then, the radio quality estimation unit 212 selects radio cell sets one by one (S104).

  Next, the radio quality estimation unit 212 estimates the traffic load for each radio cell when power saving control is performed on each radio cell included in the selected radio cell set (S105). This estimation is calculated according to the number of wireless terminals that switch wireless cell connections after power saving control. Further, the radio quality estimation unit 212 calculates the coverage deterioration rate by the method described above.

  Next, the radio quality estimation unit 212 estimates the radio quality of each radio terminal when power saving control is performed on each radio cell included in the selected radio cell set (S106). The radio quality estimation unit 212 reflects the estimated value in the radio quality statistical information 400 in the radio quality statistical information storage device 201 (S107).

  After performing the above-described processing (S105 to S107) for all the radio cell sets, the radio quality estimation unit 212 sends the radio quality statistical information 400 to other radio base stations or the like via the transmission / reception unit 210 ( S108). Further, the power saving target selection unit 213 calculates a radio base station that performs power saving based on the created radio quality statistical information 400 (S109).

A method for calculating the SINR value after power saving control from the RSRP value even when the wireless terminal cannot calculate the SINR value will be described below. In the following (Expression 1), γij is a value obtained by estimating the SINR value regarding the wireless terminal that has transmitted the measurement result j in the wireless cell i, Siji is the RSRP value obtained from the measurement result j for the serving cell i, and Iijk is The RSRP value of the neighbor cell k obtained from the measurement result j transmitted by the wireless terminal having the serving cell as the wireless cell i, ρk is the traffic load (0 <= ρk <= 1) of the neighbor cell k, and kTBF is the heat Noise.

By using (Equation 1) in this way, the wireless quality estimation unit 212 can calculate the SINR value if the RSRP value can be calculated even when the wireless terminal cannot calculate the SINR value. Furthermore, the RSRQ value Qij may be calculated using the following (Equation 2).

  Then, the effect of the radio | wireless communications system concerning this Embodiment is demonstrated. As described above, the radio quality estimation unit 212 estimates the radio quality and the coverage deterioration rate after the power saving control. The power saving target selection unit 213 can select an appropriate power saving control target in consideration of the wireless quality and the like in order to select the power saving control target with reference to the wireless quality and the coverage deterioration rate. That is, the radio communication system according to the present embodiment can execute power saving control while suppressing deterioration of radio quality associated with power saving control as much as possible.

  Further, as described above, the radio quality estimation unit 212 creates all radio cell sets that can be created based on the measurement result of the radio quality transmitted from the radio terminal. Furthermore, the radio quality estimation unit 212 estimates the radio quality and coverage degradation rate after the power saving control of each radio cell set. The power saving target selection unit 213 selects a power saving control target with reference to the wireless quality and the coverage deterioration rate. That is, since the power saving target selection unit 213 selects a power saving target in consideration of the state after power saving control of another radio base station, power saving and degradation of radio quality in the entire radio communication system. Prevention can be achieved.

  Furthermore, the radio quality estimation unit 212 notifies other radio base stations and network management devices of information relating to the radio quality estimated as described above, that is, enables sharing. By this notification, the communication amount of the entire network is compressed, and the network load and the like are reduced. Thereby, the signaling and data traffic in the whole radio | wireless communications system can be suppressed.

<Embodiment 2>
Next, the best mode for carrying out the second invention of the present invention will be described in detail. The radio communication system according to the present embodiment is characterized by performing pause control of a transmission unit for each radio base station. In addition, the process part which attached | subjected the same name and the same code | symbol performs the same process as Embodiment 1. FIG.

  The basic configuration of the radio communication system and the radio base station 120 according to the present embodiment is the same as that of the first embodiment (FIGS. 1 and 2). Furthermore, the basic operation of the radio base station 120 is the same as that shown in FIG. 7, but power saving control is performed simultaneously on all radio cells belonging to the same radio base station (for example, the pause control of the transmission unit is performed). carry out). Hereinafter, differences from the first embodiment will be described.

  In the creation of a radio cell set (S103 in FIG. 7), the radio quality estimation unit 212 creates a radio cell set with a radio cell configured by the same radio base station as a unit. For example, as shown in FIG. 3, when the base station having the base station ID “1” configures the radio cells A to C, the radio quality estimation unit 212 ((A), “B”, “C”) A radio cell set is generated in units of In other words, the radio quality estimation unit 212 performs a radio cell set including (“A”, “B”, “C”) or a radio cell set not including (“A”, “B”, “C”). Create one. Radio quality estimation section 212 estimates the radio quality when power saving control is performed by the same method as in Embodiment 1, and notifies the estimation result to other radio base stations.

  Next, effects of the communication system according to the present embodiment will be described. The radio base station 120 according to the present embodiment performs power saving control, preferably suspension control of a transmission function, for all the radio cells configured by the radio base station. That is, the common unit between the radio cells in the transceiver unit 210 in the radio base station 120 can be suspended. As a result, even when no traffic load is applied, the power consumed in a fixed manner can be reduced, and the power saving performance of the entire wireless communication system can be further improved.

<Embodiment 3>

  Next, the best mode for carrying out the third invention of the present invention will be described in detail. The radio quality estimation unit 212 according to the present embodiment is characterized in that the radio cell sets to be created are limited, that is, the total number of radio cell sets is reduced. In the figure, processing units having the same names and the same reference numerals perform basically the same processing as in the first and second embodiments.

  The basic configuration of the radio communication system and the radio base station 120 according to the present embodiment is the same as that of the first embodiment (FIGS. 1 and 2). Further, the basic operation of the radio base station 120 is the same as the operation shown in FIG. 7, but the number of radio cell sets to be created is limited in the radio cell set creation process (S103 in FIG. 7). Hereinafter, differences from the first embodiment will be described. A radio cell set is created according to one of the following policies.

(1) If the coverage degradation rate when the power saving control is performed on a radio cell (hereinafter also referred to as the own cell) configured by the own radio base station exceeds a predetermined value, the radio including the own cell Do not create a cell set (exclude it from power saving control).
(2) When (1) is not satisfied, a wireless cell set including a neighboring wireless cell adjacent to the own cell (hereinafter also referred to as a neighboring cell) is not created (excluded from power saving control) .
(3) If (1) is not satisfied, a wireless cell set including a neighboring cell that is in an inclusive relationship with the own cell is created (included in a candidate for power saving control).

  The above (1) to (3) will be described in detail with reference to FIG. FIG. 8 is a flowchart showing a radio cell set creation operation (corresponding to S103 in FIG. 7) of the radio quality estimation unit 212 according to the present embodiment.

  The radio quality estimation unit 212 extracts a cell ID from the measurement information 310 (for example, extracts a cell ID (“A” to “G”, “X”) from the measurement information 310 illustrated in FIG. 4) (S201). Note that the radio quality estimation unit 212 may extract the radio cell ID in units of radio cells configured by the same base station, as in the second embodiment.

  Next, radio quality estimation section 212 saves the own cell (for example, one of the cell IDs “A”, “B”, and “C” in the base station ID = 1 shown in FIG. 3). The coverage deterioration rate when power control is performed is estimated by the same method as in the first embodiment (S202). Then, the wireless quality estimation unit 212 determines whether or not the estimated coverage deterioration rate is less than a predetermined value (S203).

  When the coverage deterioration rate is not less than the predetermined value (is greater than or equal to the predetermined value) (S203: No), the radio quality estimation unit 212 determines that the own cell is not subject to power saving control, and excludes the own cell. A radio cell set is created (S204).

  On the other hand, when the coverage deterioration rate is less than the predetermined value (S203: Yes), the radio quality estimation unit 212 calculates the ratio of radio terminals that switch connections to neighboring cells after performing power saving control on the own cell (S205). From the ratio of connection switching destinations of wireless terminals, the wireless quality estimation unit 212 can determine the adjacency relationship of coverage between wireless cells. At the same time, the radio quality estimation unit 212 can grasp a radio cell in which the coverage deterioration rate significantly increases when power saving control is performed simultaneously with the own cell.

  Next, the radio quality estimation unit 212 determines whether or not the switching ratio of each neighboring cell is within a predetermined range (S206). For example, the predetermined range is 10% or more and less than 90%. The radio quality estimation unit 212 determines that a neighboring cell within a predetermined range cannot be subjected to power saving control simultaneously with the own cell (S206: No), and creates a radio cell set excluding the neighboring cell (S207). ). When the switching ratio of a certain neighboring cell exceeds the upper limit value of the predetermined range, it can be determined that the coverage of the neighboring cell and the coverage of the own cell are significantly overlapped. Therefore, such a peripheral cell can be a target of power saving control. In this way, the radio quality estimation unit 212 limits the total number of radio cell sets.

  The radio quality estimation unit 212 determines that the neighboring cells that are not within the predetermined range can be subjected to power saving control simultaneously with the own cell (S206: Yes), and creates a radio cell set related to the own cell and the neighboring cell (S208). ).

  A specific example of the processing of S203 and S205 to S208 will be described with reference to FIG. FIG. 9 is a pie chart showing the switching rate of wireless terminals when power saving control is performed on the wireless cell “X”. In FIG. 9, when the power saving control is performed on the wireless cell “X”, 40% of the wireless terminals connected to the wireless cell “X” are connected to the wireless cell “A”, and 41% are the wireless cell “B”. 7% are connected to the wireless cell “C”, 6% are connected to the wireless cell “D”, 5% are connected to the wireless cell “E”, and 1% cannot be connected. Therefore, when the predetermined value of the coverage degradation rate (threshold value in S203) is larger than 1%, the radio cell “X” becomes a target of power saving control (can be included in the radio cell set). Further, when the predetermined ratio (predetermined range in S206) is 10% to 90%, the wireless cell “A” and the wireless cell “B” are determined to be adjacent to the wireless cell “X”, and the wireless cell “X” is determined. At the same time, it is excluded from the targets for power saving control.

  Next, effects of the radio communication system according to the present embodiment will be described. The radio quality estimation unit 212 according to the present embodiment limits the total number of radio cell sets to be created with reference to the coverage deterioration rate after power saving control for the own cell and the connection switching ratio to the neighboring cells. Thereby, the calculation load of the estimation process after the power saving control performed by the wireless quality estimation unit 212 and the amount of information transmitted to other wireless base stations can be reduced. Furthermore, the radio base station 120 can suppress signaling and data traffic when reporting statistical information to other radio base stations and network management devices, and can reduce the network load. That is, it is not necessary to use a high-performance, high-capacity computer system for calculation of a radio base station that performs power saving control, and the network load is reduced, and the entire radio communication system is saved as in the first embodiment and the like. Electricity can be achieved.

<Embodiment 4>
Next, the best mode for carrying out the fourth invention of the present invention will be described in detail. The radio base station 120 according to the present embodiment includes a traffic load estimator 501. The traffic load estimator 501 estimates in detail a change in traffic load associated with power saving control for each radio cell. And In the figure, processing units having the same names and the same reference numerals perform basically the same processing as in the first and second embodiments.

  FIG. 10 is a block diagram showing a configuration of radio base station 120 according to the present embodiment. The radio base station 120 includes a traffic load estimation unit 501 in addition to the configuration of FIG. The wireless quality estimation unit 212 described above estimates the traffic load based on the number of connection switching after power saving control. The traffic load estimation unit 501 is a processing unit that calculates a more accurate traffic load after power saving control. The traffic load estimation unit 501 supplies the calculated traffic load to the radio quality estimation unit 212. Details of the processing of the traffic load estimation unit 501 will be described below.

FIG. 11 is a flowchart showing a processing flow of the traffic load estimation unit 501. The traffic load estimation unit 501 acquires statistical information (SINR estimated value after power saving control for each created wireless cell set) from the wireless quality statistical information storage device 201 (S301). Subsequently, the traffic load estimation unit 501 calculates the cell capacity of each wireless cell. Specifically, the traffic load estimation unit 501 calculates the cell capacity Ci of the wireless cell i to be calculated using the following (Equation 3). Note that γij is an SINR estimation value for the measurement result j in the wireless cell i, and the wireless cell i is a cell that becomes a serving cell after performing power saving control. Ne (i) is the total number of measurement results collected for wireless cell i after power saving control, B is the frequency bandwidth used by the wireless communication system, and α is implementation-dependent with respect to the Shannon limit This is an approximate coefficient for the capacity degradation.

Next, the traffic load estimation unit 501 uses the calculated cell capacity (Ci) and the communication amount (Di) per unit time in the wireless cell i (Equation 4) to estimate the traffic load after performing power saving control. ρi is calculated (S303). The communication amount Di is calculated from the communication amount before the power saving control is performed and the communication amount of the wireless terminal whose connection is switched to the wireless cell i after the power saving control is performed.

Note that the estimated value ρi of the traffic load of the wireless cell i may be calculated from (Equation 5) using the measured or estimated cell capacity Ci_pre before the power saving control and the traffic load ρi_pre.

  The traffic load estimation unit 501 supplies the estimated traffic load for each radio cell to the radio quality estimation unit 212. The radio quality estimation unit 212 executes again the estimation process shown in FIG. 7 using the supplied traffic load (S304).

  Next, effects of the radio communication system according to the present embodiment will be described. As described above, the radio base station 120 includes the traffic load estimator 501. The traffic load estimator 501 estimates in detail the change in traffic load associated with the power saving control for each radio cell. Since this estimated value is calculated considering not only the number of connection switching after power saving control but also the cell capacity and the like, the estimation accuracy is high. The radio quality estimation unit 212 generates the radio quality statistical information 400 described above using the traffic load estimation value for each radio cell supplied from the traffic load estimation unit 501. For this reason, the power saving target selection unit 213 can more accurately select a radio cell that can efficiently save power while suppressing deterioration in radio quality. Furthermore, by referring to this traffic load, congestion of the radio cell can be avoided. By avoiding radio cell congestion, it is possible to prevent communication processing failures and radio quality degradation.

<Embodiment 5>
Next, the best mode for carrying out the fifth aspect of the present invention will be described in detail. The power saving target selection unit 213 according to the present embodiment sets a wireless cell set in which the estimated value of the wireless quality after power saving control satisfies a predetermined value in any wireless cell and congestion does not occur in any wireless cell. It is selected as a target of power saving control. Hereinafter, the flow of processing of the wireless quality evaluation unit according to the present embodiment is shown in FIG. FIG. 12 is a flowchart showing a processing flow of the power saving target selection unit 213 according to the present embodiment.

  The power saving target selection unit 213 acquires the wireless quality statistical information 400, that is, the estimated value after power saving control for each wireless cell set, from the wireless quality statistical information storage device 201 (S401). Here, it is assumed that the radio quality statistical information 400 shown in FIG. 5 is held. The power saving target selection unit 213 extracts statistical information (SINR statistical information 410, SINR statistical information 420) for each wireless cell set included in the wireless quality statistical information 400. The power saving target selection unit 213 performs processing on each of the extracted statistical information (the following description will describe processing when the SINR statistical information 410 is extracted). The power saving target selection unit 213 extracts SINR values of the lower (bad) 5% of the SINR values from the SINR statistical information 410, and determines whether or not those values satisfy a predetermined value (S402). The lower (bad) 5% of the SINR value means the SINR value of a user located near a cell boundary or the like. In the above description, the threshold value is set to 5%. However, the threshold value is not necessarily limited thereto, and may be another value such as 10%.

  Furthermore, the power saving target selection unit 213 determines whether the traffic load of each wireless cell after the power saving control is less than a required value (S403). When both conditions (S402, S403) are satisfied, the power saving target selection unit 213 selects the radio cell set related to the SINR statistical information 410 as a target for power saving control (S404).

  When there are a plurality of wireless cell sets that satisfy both conditions (S402, S403), the power saving target selection unit 213 selects the one with the largest number of wireless cells included in the wireless cell set. Further, when the number of wireless cells included in the wireless cell is equal, the power saving target selecting unit 213 selects a wireless cell set having the maximum value of the lower 5% of the SINR estimated value. In the above description, the radio cell set is selected based on the SINR value. However, the present invention is not necessarily limited to this, and the same processing may be performed using the RSRP value.

  Next, effects of the radio communication system according to the present embodiment will be described. As described above, the power saving target selection unit 213 has a wireless cell set in which the estimated value of the wireless quality after power saving control satisfies a predetermined value in any wireless cell, and the traffic load is less than the predetermined value in any wireless cell. Is selected as the target of power saving control. As a result, it is possible to improve the power saving performance while more reliably suppressing the deterioration of the radio quality associated with the power saving control.

<Sixth Embodiment>
Next, the best mode for carrying out the sixth aspect of the present invention will be described in detail. The radio quality estimation unit 212 according to the present embodiment is characterized in that the above-described radio cell set can be created even when measurement results from radio terminals cannot be sufficiently collected. Hereinafter, processing (corresponding to S103 in FIG. 7) of the wireless quality estimation unit 212 according to the present embodiment will be described with reference to FIG. Note that the wireless quality statistical information storage device 201 sequentially stores statistical information related to RSRP.

  When creating the wireless cell set, the wireless quality estimation unit 212 determines whether there is a wireless cell in which the measurement information transmitted from the wireless terminal cannot be collected by a predetermined number or more (S501). Then, the radio quality estimation unit 212 selects all radio cells for which a predetermined number or more of measurement information has not been collected. For example, measurement information cannot be sufficiently collected in a time zone when the traffic load of the entire network is low.

  The radio quality estimation unit 212 acquires the RSRP estimation value after performing the power saving control previously estimated for each of the selected radio cells (S502). Here, it is desirable that the radio quality estimation unit 212 obtains an RSRP estimated value estimated in a time zone when the traffic load is high. Here, the time zone in which the traffic load is high may be a time zone in which the most measurement results are collected in one day, or the most recent time zone in which the total number per unit time is a predetermined value or more.

  The radio quality estimation unit 212 creates a radio cell set, calculates the quality estimate value of the radio cell after performing power saving control, and the like as in the first embodiment. At this time, the radio quality estimation unit 212 can use the estimated value acquired in S502 as the estimated quality value of the radio cell.

  Next, effects of the radio communication system according to the present embodiment will be described. As described above, the radio quality estimation unit 212 uses previously collected measurement information for radio cells for which a predetermined number or more of measurement information could not be collected. Thereby, even if there is a radio cell in which measurement information cannot be sufficiently collected due to a low traffic load, the radio base station 120 can select a radio base station that appropriately performs power saving control.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  Each process of the above-described processing units (transmission / reception unit 210, measurement control unit 211, radio quality estimation unit 212, power saving target selection unit 213) in the radio base station 120 is realized as a program that operates in an arbitrary computer. It is possible. The program may be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W and semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  FIG. 14 shows a hardware configuration example of a computer system for realizing the radio base station 120. For example, the system includes a central processing unit (CPU) 600 and a memory 610. The CPU 600 and the memory 610 are connected to a hard disk device (HDD) 620 as an auxiliary storage device via a bus. The system typically includes user interface hardware. Examples of user interface hardware include an input device 630 such as a pointing device (mouse, joystick, etc.) and a keyboard for inputting, and a display device 640 such as a liquid crystal display for presenting visual data to the user. There is. A storage medium such as the hard disk device 620 can store a computer program for giving a command to the CPU 600 or the like in cooperation with the operating system and for executing functions of each part of the system. That is, the program is expanded on the memory 610, the CPU 600 performs processing according to the program, and each block of the radio base station 120 is configured by cooperating with other hardware configurations. Each process performed by the radio base station 120 is realized by the CPU 600 executing a predetermined program. Of course, these systems can be configured by a plurality of computers, not by a single computer.

  Furthermore, in the above description, the radio base station 120 has been described as performing processing such as radio quality estimation, but the present invention is not necessarily limited thereto. The estimation processing by the radio base station 120 may be performed by the network management apparatus 103, or may be performed by another server or the like. That is, an arbitrary processing device existing on the network may execute each process of the radio base station 120 described above.

  The present invention can be applied to, for example, a radio base station and a network management apparatus that perform power saving operation in a radio communication system. Furthermore, the present invention can be applied to radio quality evaluation in a radio base station or a network management device.

  The present invention can be applied to radio quality evaluation performed in a radio base station or a network management apparatus for a radio base station failure or power outage.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
A processing apparatus comprising: a power saving target selecting unit that selects the wireless cell set that performs power saving control based on a wireless quality estimation result when power saving control is performed.

(Appendix 2)
The radio quality estimation means includes
The processing apparatus according to appendix 1, wherein it is determined whether or not to include all radio cells that constitute a radio base station as a unit in the radio cell set.

(Appendix 3)
The radio quality estimation means includes
The supplementary note 1 or the supplementary note 2 is characterized in that if the coverage deterioration rate when the power saving control is performed on a certain wireless cell exceeds a predetermined value, the wireless cell is not included in any of the wireless cell sets. Processing equipment.

(Appendix 4)
The radio quality estimation means includes
If the coverage deterioration rate when the power saving control is performed on the first wireless cell does not exceed a predetermined value, the ratio of wireless terminals that switch connection from the first wireless cell to another wireless cell is estimated, The processing apparatus according to appendix 3, wherein control is performed so that the second radio cell and the first radio cell whose switching rate is within a predetermined rate range are not included in the same radio cell set.

(Appendix 5)
The power saving target selecting means is:
The wireless cell set is selected as a target for power saving control, wherein a quality value calculated from the wireless quality statistical information satisfies a predetermined quality and a traffic load after power saving control satisfies a predetermined value. The processing apparatus according to any one of supplementary notes 1 to 4.

(Appendix 6)
The power saving target selecting means is:
When there are a plurality of wireless cell sets in which the quality value calculated from the wireless quality statistical information satisfies a predetermined quality and the traffic load after power saving control satisfies the predetermined value, the number of wireless cells included is the largest The processing apparatus according to appendix 5, wherein the wireless cell set is selected as a power saving control target.

(Appendix 7)
The radio quality estimation means includes
Storing the estimated wireless quality statistical information in a storage means;
When a certain number of pieces of measurement information for a certain radio cell cannot be collected within a certain time, the radio quality for the radio cell is obtained from the storage unit and used as an estimated value. The processing apparatus according to any one of supplementary notes 1 to 6.

(Appendix 8)
The radio quality estimation means includes
When power saving control is performed on a certain radio cell, each radio terminal that uses the radio cell as a serving cell estimates the radio cell switching ratio for switching connections, and estimates the radio quality when switching The processing apparatus according to any one of appendix 1 to appendix 7, which is a feature.

(Appendix 9)
The measurement result is
Reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), desired signal power to interference signal power ratio (SIR) In any one of appendix 1 to appendix 8, including at least one of: Signal to Interference Ratio (SNR), Signal to Interference plus Noise Power Ratio (SINR) The processing apparatus as described.

(Appendix 10)
Based on the radio quality statistical information, the cell capacity of each radio cell after power saving control is calculated, the communication amount per unit time of each radio cell, the calculated cell capacity, and the connection after power saving control The processing apparatus according to any one of appendix 1 to appendix 9, further comprising: a traffic load calculating unit that calculates a traffic load of each wireless cell after power saving control based on the switching status.

(Appendix 11)
The power saving target selecting means is:
There are a plurality of radio cell sets in which the quality value calculated from the radio quality statistical information satisfies a predetermined quality, the traffic load after power saving control satisfies the predetermined value, and the same number of radio cells are included. In this case, the processing apparatus according to appendix 6, wherein the wireless cell set having the best quality value calculated from the wireless quality statistical information is selected as a power saving control target.

(Appendix 12)
The radio quality estimation means includes
If a certain number or more of measurement information for the radio cell with the measurement control means cannot be collected within a certain time, the radio quality of the time when the traffic load on the radio cell is the largest is obtained from the storage means and estimated value The processing apparatus according to appendix 7, wherein:

(Appendix 13)
A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
A power saving control method comprising: a power saving target step for selecting the wireless cell set for performing power saving control based on a wireless quality estimation result when power saving control is performed.

(Appendix 14)
On the computer,
A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
A program for executing a power saving target step of selecting the wireless cell set to be subjected to power saving control based on an estimation result of wireless quality when power saving control is performed.

(Appendix 15)
A communication system comprising a first device and a second device that can communicate with each other,
Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
The notification means for notifying the wireless base station or the network management device of the estimation result of the wireless quality when the power saving control is performed and the power saving control based on the estimation result of the wireless quality when the power saving control is performed A power saving target selecting means for selecting a wireless cell set,
The measurement control unit, the wireless quality estimation unit, the notification unit, and the power saving target selection unit are provided in either the first or the second device.

100 external network 101 core network 102 wireless access network 103 network management devices 110 to 113 wired links 120 to 122 wireless base stations 130 to 133 wireless terminals 140 to 142 wireless cell 200 base station information storage device 201 wireless quality statistical information storage device 210 Unit 211 measurement control unit 212 wireless quality estimation unit 213 power saving target selection unit 300 base station information 301 base station ID
302 Cell ID
303 Traffic load 304 Maximum transmission power 305 Antenna configuration 310 Measurement information 311 RANK
312 RSRP value 313 Cell ID
400 Radio quality statistical information 410, 420 SINR statistical information 411, 421 SINR values 412, 422 Dead zone information 413, 423 Statistical values 430, 440 RSRP statistical information 431, 441 RSRP values 432, 442 Dead zone information 433, 443 Statistical values 501 Traffic load estimation unit 600 CPU
610 Memory 620 HDD
630 Input device 640 Display device

Claims (10)

Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
Power saving target selection means for selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed , and
The radio quality estimation means includes
A processing apparatus for determining whether or not to include all wireless cells formed by a certain wireless base station as a unit in the wireless cell set . Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
  Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
  Power saving target selection means for selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  The radio quality estimation means includes
  If the coverage degradation rate when power saving control is performed on a certain radio cell exceeds a predetermined value, the radio cell is not included in any of the radio cell sets, and power saving control is performed on the first radio cell. If the coverage deterioration rate when implementing the above does not exceed a predetermined value, the ratio of wireless terminals that switch connection from the first wireless cell to another wireless cell is estimated, and the switching ratio falls within a predetermined ratio range. 2. A processing apparatus for controlling so as not to include two wireless cells and the first wireless cell in the same wireless cell set. Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
  Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
  Power saving target selection means for selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  The power saving target selecting means is:
  The radio quality statistics information selected from the radio cell set that satisfies the quality value calculated from the radio quality statistical information and the traffic load after the power saving control satisfies the predetermined value is selected as a power saving control target. When there are a plurality of the wireless cell sets in which the quality value calculated from the above satisfies the predetermined quality and the traffic load after power saving control satisfies the predetermined value, the wireless cell set including the largest number of wireless cells is included. A processing apparatus that is selected as a target of power saving control. Measurement control means for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets Radio quality estimation means for estimating quality based on measurement results collected by the measurement control means;
  Means for notifying a wireless base station or a network management device of an estimation result of wireless quality when power saving control is performed;
  Power saving target selection means for selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  The radio quality estimation means includes
  Save the estimated wireless quality statistical information in the storage means,
  When a certain number of pieces of measurement information for a certain radio cell cannot be collected within a certain time, the radio quality for the radio cell is obtained from the storage unit and used as an estimated value. Processing equipment. A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
  A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
  A power saving target selection step of selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  In the radio quality estimation step,
  A radio communication control method, comprising: determining whether or not to include all radio cells configured by a radio base station as a unit in the radio cell set. A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
  A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
  A power saving target selection step of selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  In the radio quality estimation step,
  If the coverage degradation rate when power saving control is performed on a certain radio cell exceeds a predetermined value, the radio cell is not included in any of the radio cell sets, and power saving control is performed on the first radio cell. If the coverage deterioration rate when implementing the above does not exceed a predetermined value, the ratio of wireless terminals that switch connection from the first wireless cell to another wireless cell is estimated, and the switching ratio falls within a predetermined ratio range. A radio communication control method, wherein control is performed so that two radio cells and the first radio cell are not included in the same radio cell set. A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
  A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
  A power saving target selection step of selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  In the power saving target selection step,
  The radio quality statistics information selected from the radio cell set that satisfies the quality value calculated from the radio quality statistical information and the traffic load after the power saving control satisfies the predetermined value is selected as a power saving control target. When there are a plurality of the wireless cell sets in which the quality value calculated from the above satisfies the predetermined quality and the traffic load after power saving control satisfies the predetermined value, the wireless cell set including the largest number of wireless cells is included. A wireless communication control method, wherein the method is selected as a power saving control target. A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
  A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
  A power saving target selection step of selecting the wireless cell set for performing power saving control based on the estimation result of the wireless quality when the power saving control is performed, and
  In the radio quality estimation step,
  Save the estimated wireless quality statistical information in the storage means,
  When a certain number of pieces of measurement information for a certain radio cell in the measurement control step cannot be collected within a certain time, the radio quality of the radio cell is obtained from the storage means and used as an estimated value. Wireless communication control method.   On the computer,
  A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
  Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
  A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
    Based on the estimation result of the wireless quality when the power saving control is performed, the power saving target selecting step for selecting the wireless cell set for performing the power saving control is executed, and
  In the radio quality estimation step,
A program for deciding whether or not to include all radio cells formed by a radio base station as a unit in the radio cell set. On the computer,
A measurement control step for collecting measurement results of radio quality for each radio cell from a radio terminal;
Radio in the case where a plurality of radio cell sets including one or more radio cells are generated from a radio cell and neighboring radio cells of the radio cell, and power saving control is performed on the radio cells included in each of the one or more radio cell sets A radio quality estimation step for estimating quality based on the measurement result collected in the measurement control step;
A notification step of notifying a wireless base station or a network management device of a wireless quality estimation result when power saving control is performed;
Based on the estimation result of the wireless quality when the power saving control is performed, the power saving target selecting step for selecting the wireless cell set for performing the power saving control is executed , and
In the radio quality estimation step,
Save the estimated wireless quality statistical information in the storage means,
When a certain number of pieces of measurement information for a certain radio cell in the measurement control step cannot be collected within a certain time, the radio quality of the radio cell is obtained from the storage means and used as an estimated value. program to be.

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