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WO2017221349A1 - Système de communication sans fil, procédé de communication sans fil et station de base - Google Patents

Système de communication sans fil, procédé de communication sans fil et station de base Download PDF

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Publication number
WO2017221349A1
WO2017221349A1 PCT/JP2016/068521 JP2016068521W WO2017221349A1 WO 2017221349 A1 WO2017221349 A1 WO 2017221349A1 JP 2016068521 W JP2016068521 W JP 2016068521W WO 2017221349 A1 WO2017221349 A1 WO 2017221349A1
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WIPO (PCT)
Prior art keywords
base station
radio
wireless
channel capacity
wireless device
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Ceased
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PCT/JP2016/068521
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English (en)
Japanese (ja)
Inventor
三夫 小林
義博 河▲崎▼
大出　高義
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/JP2016/068521 priority Critical patent/WO2017221349A1/fr
Publication of WO2017221349A1 publication Critical patent/WO2017221349A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/22—Negotiating communication rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a wireless communication system, a wireless communication method, and a base station.
  • Patent Documents 1 and 2 There is known a wireless communication system that includes a plurality of base stations and a plurality of wireless devices, and performs wireless communication between the plurality of base stations and the plurality of wireless devices (for example, Patent Documents 1 and 2, and Non-Patent Documents 1 to 8).
  • the base station allocates radio resources for communication between a plurality of radio apparatuses connected to the base station and the base station. For example, the base station assigns radio resources according to a PF (Proportional Fair) method.
  • PF Proportional Fair
  • radio resources are allocated based on the instantaneous channel capacity and the average channel capacity.
  • Instantaneous channel capacity represents the amount of data communicated per unit time between a wireless device and a base station at a given time.
  • the average channel capacity is an average value of the instantaneous channel capacity with respect to time.
  • radio resources are more easily allocated as the average channel capacity is smaller, and radio resources are more easily allocated as the instantaneous channel capacity is larger. As a result, radio resources can be allocated fairly to a plurality of radio apparatuses connected to the base station.
  • a wireless communication system may execute a handover for switching a base station to which a wireless device is connected from a first base station to a second base station.
  • the second base station immediately after the handover is executed, the second base station cannot acquire information relating to the speed of communication performed by the wireless device targeted for the handover before the handover is executed.
  • the second base station may use a predetermined value or instantaneous channel capacity as the average channel capacity.
  • the speed (for example, average channel capacity) of communication between the radio apparatus and the second base station cannot be sufficiently reflected in the radio resource allocation in the second base station.
  • radio resources may not be allocated fairly to the radio apparatus connected to the second base station.
  • radio resources may not be properly allocated after handover is executed. Note that this problem can also occur in systems other than the PF system.
  • One of the objects of the present invention is to appropriately execute allocation of radio resources after handover is executed.
  • a wireless communication system includes a plurality of wireless devices including a first wireless device, and a first base station and a second base station that communicate with the plurality of wireless devices wirelessly.
  • the wireless communication system further includes a receiving unit and a control unit.
  • the receiving unit receives the first base station from the first base station in response to a handover in which the base station to which the first radio apparatus is connected switches from the first base station to the second base station. Information regarding the speed of communication between one base station and the first wireless device is received.
  • the control unit determines a radio resource used for communication between at least one radio apparatus including the first radio apparatus connected to the second base station by the handover and the second base station. assign.
  • FIG. 2 is a block diagram illustrating an example of a configuration of a wireless device in FIG. 1. It is a flowchart showing an example of the process which the base station of FIG. 1 performs. It is a flowchart showing an example of the process which the base station of FIG. 1 performs.
  • FIG. 2 is a sequence diagram illustrating an example of an operation of the wireless communication system in FIG. 1.
  • FIG. 2 is a sequence diagram illustrating an example of an operation of the wireless communication system in FIG. 1.
  • the wireless communication system 1 of the first embodiment performs wireless communication according to a predetermined communication method.
  • the communication method is the LTE method.
  • LTE is an abbreviation for Long Term Evolution.
  • the communication method may be a method different from the LTE method (for example, a method such as LTE-Advanced or 5G (5th Generation)). Further, the communication method may be a method using NOMA (Non-Orthogonal Multiple Access).
  • the wireless communication system 1 includes a packet gateway device 10 and a serving gateway device 20.
  • the packet gateway device may be represented as PGW (Packet Gateway).
  • the serving gateway device may be represented as SGW (Serving Gateway).
  • the number of PGWs 10 included in the wireless communication system 1 may be two or more.
  • the number of SGWs 20 included in the wireless communication system 1 may be two or more.
  • the PGW 10 and the SGW 20 are connected so as to communicate with each other.
  • An interface between the PGW 10 and the SGW 20 may be represented as an S5 interface.
  • the wireless communication system 1 includes P mobility management devices 30-1, ..., 30-P, M base stations 40-1, ..., 40-M, and N wireless devices 50-1,. ..., 50-N.
  • the mobility management device may be represented as MME (Mobility Management Entity).
  • P represents an integer of 2 or more.
  • MME30-p is also expressed as MME30 when it is not necessary to distinguish between them.
  • p represents each integer of 1 to P.
  • MME30-p may be represented as MME # p.
  • M represents an integer of 2 or more.
  • the base station 40-m is also referred to as a base station 40 when it is not necessary to distinguish.
  • m represents each integer from 1 to M.
  • Base station 40-m may be represented as base station #m.
  • N represents an integer of 1 or more.
  • the wireless device 50-n is also referred to as a wireless device 50 when it is not necessary to distinguish between them.
  • n represents each integer of 1 to N.
  • the wireless device 50-n may be represented as a wireless device #n.
  • each of the MME 30-1 and the MME 30-2 and the SGW 20 are connected to be communicable with each other.
  • An interface between each of the MME 30-1 and the MME 30-2 and the SGW 20 may be represented as an S11 interface.
  • the MME 30-1 and the MME 30-2 are connected to be communicable with each other.
  • the interface between the MME 30-1 and the MME 30-2 may be represented as an S10 interface.
  • Each of the base station 40-1 and the base station 40-2 and the MME 30-1 are connected to be communicable with each other.
  • An interface between each of the base station 40-1 and the base station 40-2 and the MME 30-1 may be represented as an S1-MME interface.
  • the base station 40-1 and the base station 40-2 are connected to be communicable with each other.
  • the interface between the base station 40-1 and the base station 40-2 may be expressed as an X2 interface.
  • the base station 40-3 and the MME 30-2 are connected so as to communicate with each other.
  • An interface between the base station 40-3 and the MME 30-2 may be expressed as an S1-MME interface.
  • the base station 40-m forms a wireless area.
  • the base station 40-m may form a plurality of radio areas.
  • the wireless area may be represented as a coverage area or a communication area.
  • the wireless area may be represented as a cell.
  • the cell is a macro cell, a micro cell, a nano cell, a pico cell, a femto cell, a home cell, a small cell, a sector cell, or the like.
  • the base station 40-m communicates wirelessly with a wireless device 50-n located in a cell formed by the base station 40-m.
  • the base station 40-m provides radio resources in the cell formed by the base station 40-m.
  • radio resources are identified by time and frequency.
  • the radio resource includes a plurality of resource elements (REs) having different combinations of time and frequency.
  • REs resource elements
  • a period corresponding to seven REs that are continuous along the time axis is called a slot.
  • Two slots that are continuous along the time axis form one subframe.
  • 10 subframes that are continuous along the time axis form one radio frame.
  • the base station 40-m communicates with the radio apparatus 50-n located in the cell formed by the base station 40-m by using radio resources provided in the cell.
  • An interface between the base station 40-m and the radio apparatus 50-n may be expressed as an RRC (Radio Resource Control) interface.
  • the base station 40-m may be represented as a base station device, a wireless communication device, an eNB (Evolved Node B), or an NB (Node B).
  • eNB evolved Node B
  • NB Node B
  • EPC The portion higher than the base station 40 (in other words, close to the PGW 10) in the wireless communication system 1 may be represented as EPC.
  • EPC is an abbreviation for Evolved Packet Core.
  • a portion formed by the base station 40 in the wireless communication system 1 may be represented as E-UTRAN.
  • E-UTRAN is an abbreviation for Evolved Universal Terrestrial Radio Access Network.
  • the radio apparatus 50-n communicates by radio with the base station 40-m that forms the cell, using radio resources provided in the cell in which the radio apparatus 50-n is located.
  • the radio device 50-n may be represented as a mobile station, a radio terminal, a terminal device, a radio device, or a user terminal (UE).
  • the wireless device 50-n may be carried by a user, may be mounted on a moving body such as a vehicle, or may be fixed.
  • the base station 40-m includes an antenna 401, a reception radio unit 402, a demodulation / decoding unit 403, a control unit 404, a communication unit 405, an encoding modulation unit 406, And a transmission wireless unit 407.
  • the communication unit 405 is an example of a reception unit and an example of a transmission unit.
  • At least a part of the base station 40-m is realized by an LSI (Large Scale Integration). At least a part of the base station 40-m may be realized by a programmable logic circuit device (PLD; Programmable Logic Device).
  • the base station 40-m includes a processing device and a storage device, and at least a part of the functions of the base station 40-m is realized by the processing device executing a program stored in the storage device. May be.
  • the processing device is a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).
  • the storage device is at least one of a RAM, a ROM, an HDD, an SSD, a semiconductor memory, and an organic memory.
  • RAM is an abbreviation for Random Access Memory.
  • ROM is an abbreviation for Read Only Memory.
  • HDD is an abbreviation for Hard Disk Drive.
  • SSD is an abbreviation for Solid State Drive.
  • the storage device may include a recording medium such as a flexible disk, an optical disk, a magneto-optical disk, or a semiconductor memory, and a reading device that can read information from the recording medium.
  • the reception radio unit 402 receives a radio signal via the antenna 401.
  • Reception radio section 402 performs frequency conversion from the radio frequency band to the baseband (in other words, down conversion) on the received radio signal.
  • Reception radio section 402 performs A / D conversion on the frequency-converted signal.
  • a / D is an abbreviation for Analog to Digital.
  • Reception radio section 402 outputs the signal after A / D conversion.
  • the demodulation / decoding unit 403 performs demodulation / decoding processing on the signal output from the reception radio unit 402.
  • the demodulation / decoding process includes demodulation and error correction decoding.
  • Demodulation / decoding section 403 outputs a signal after demodulation / decoding processing (in other words, received data).
  • the control unit 404 processes the reception data output from the demodulation / decoding unit 403. Furthermore, the control unit 404 generates transmission data and outputs the generated transmission data. In addition, the control unit 404 controls communication as will be described later.
  • the communication unit 405 communicates with a base station 40-q different from the base station 40-m according to the control of the control unit 404.
  • q represents an integer different from m among integers of 1 to M.
  • the base station 40-m and the base station 40-q are connected to the MME 30-p, and the base station 40-m and the base station 40-q are directly connected.
  • the base station 40-q communicates directly without going through the MME 30-p.
  • the communication unit 405 may communicate with the base station 40-q via the MME 30-p when the base station 40-m and the base station 40-q are connected to the MME 30-p.
  • the communication unit 405 uses the MME 30-p and the MME 30-r when the base station 40-m is connected to the MME 30-p and the base station 40-q is connected to the MME 30-r. Via the base station 40-q. r represents an integer different from p among integers of 1 to P.
  • the encoding modulation unit 406 performs encoding modulation processing on the transmission data output from the control unit 404.
  • the coded modulation process includes error correction coding and modulation.
  • the error correction code is a turbo code.
  • the error correction code may be a Reed-Solomon code or a convolutional code.
  • the modulation may be in accordance with a modulation scheme including a multilevel modulation scheme such as QPSK, 16QAM, or 64QAM.
  • QPSK is an abbreviation for Quadriphase Phase-Shift Keying.
  • QAM is an abbreviation for Quadrature Amplitude Modulation.
  • the encoding modulation unit 406 outputs a signal after the encoding modulation processing.
  • the transmission radio unit 407 performs D / A conversion on the signal output from the encoding modulation unit 406.
  • D / A is an abbreviation for Digital to Analog.
  • Transmission radio section 407 performs frequency conversion from the base band to the radio frequency band (in other words, up-conversion) for the signal after D / A conversion.
  • the transmission radio unit 407 transmits a signal after frequency conversion (in other words, a radio signal) via the antenna 401.
  • the control unit 404 includes a scheduler unit 4041, a connection control unit 4042, a communication speed information generation unit 4043, and a communication speed information acquisition unit 4044.
  • the scheduler unit 4041 allocates radio resources to the radio device 50 connected to the base station 40-m.
  • the scheduler unit 4041 allocates radio resources according to a PF (Proportional Fair) method for each predetermined allocation unit.
  • the allocation unit is RB.
  • the PF method may be a method described in Non-Patent Documents 7 and 8.
  • the scheduler unit 4041 acquires the instantaneous channel capacity for each of the radio apparatuses 50 connected to the base station 40-m.
  • the instantaneous channel capacity R n (t) for the wireless device 50-n represents the amount of data communicated per unit time between the wireless device 50-n and the base station 40-m at time t.
  • the instantaneous channel capacity may be expressed as instantaneous throughput or instantaneous communication speed.
  • scheduler section 4041 stores in advance the relationship between efficiency and CQI.
  • the scheduler unit 4041 measures the stored relationship and the radio signal (for example, the reference signal) transmitted from the base station 40-m received from the radio device 50-n.
  • the efficiency is acquired based on the CQI.
  • the efficiency represents the amount of data communicated between the wireless device 50-n and the base station 40-m per unit bandwidth and per unit time.
  • CQI is an abbreviation for Channel Quality Indicator.
  • the scheduler unit 4041 acquires a value obtained by multiplying the acquired efficiency by the system bandwidth of the radio resource provided by the base station 40-m as the instantaneous channel capacity R n (t).
  • the system bandwidth is 20 MHz, 15 MHz, 10 MHz, 5 MHz, 3 MHz, or 1.4 MHz.
  • the scheduler unit 4041 acquires the average channel capacity for each of the radio apparatuses 50 connected to the base station 40-m.
  • the average channel capacity T n (t) for the wireless device 50-n represents the average value of the instantaneous channel capacity R n (t) with respect to time at the time point t.
  • the average channel capacity T n (t + ⁇ t) at the time point t + ⁇ t for the wireless device 50-n is a moving average of the instantaneous channel capacity R n (t).
  • t c represents a predetermined time.
  • the average channel capacity may be expressed as average throughput or average communication speed.
  • the scheduler unit 4041 uses the mathematical formula 2 and the acquired instantaneous channel capacity R n (t) and average channel capacity T n (t) to obtain a metric value for the k-th wireless device group S k .
  • f k is calculated.
  • k represents an integer of 1 to K.
  • K represents an integer of 1 or more.
  • the wireless device group is a set of wireless devices 50 selected from the wireless devices 50 connected to the base station 40-m.
  • Equation 2 is expressed as Equation 3.
  • the scheduler unit 4041 calculates a metric value f k for the k-th wireless device group S k based on Equation 3.
  • the scheduler unit 4041 allocates radio resources to the radio devices 50 included in the radio device group S k having the maximum calculated metric value f k .
  • the connection control unit 4042 changes the base station 40 to which the radio device 50-n is connected from the base station 40-m to the base station 40-q. Whether or not to execute handover to switch to is determined based on the measurement result.
  • the handover may be expressed as HO (Handover).
  • the measurement result includes RSRP for each of a plurality of connection candidate cells including a connection cell and at least one neighboring cell, and CQI for the connection cell.
  • the connected cell is a cell formed by the base station 40-m to which the wireless device 50-n is connected.
  • the peripheral cell is a cell different from the connected cell.
  • the peripheral cell is a cell adjacent to the connected cell, or a cell at least partially overlapping with the connected cell.
  • RSRP is an abbreviation for Reference Signal Received Power.
  • the measurement result may include RSRQ instead of RSRP or in addition to RSRP.
  • RSRQ is an abbreviation for Reference Signal Received Quality.
  • the measurement result may be expressed as a measurement report.
  • the connection control unit 4042 determines to execute HO and the base station 40-q that is the HO destination, whereas when the HO condition is not satisfied, Decide not to perform HO.
  • the HO condition is a condition that a value obtained by subtracting the RSRP for the connected cell from the RSRP for the neighboring cell formed by the base station 40-q is equal to or greater than a predetermined margin amount.
  • the HO condition may be a condition that a value obtained by subtracting the RSRQ for the connected cell from the RSRQ for the neighboring cell formed by the base station 40-q is equal to or greater than a predetermined margin amount. Further, the HO condition is that the value obtained by subtracting the RSRP for the connected cell from the RSRP for the neighboring cell is equal to or greater than the first margin amount, and the value obtained by subtracting the RSRQ for the connected cell from the RSRQ for the neighboring cell is the second margin amount.
  • the condition may be as described above.
  • the communication rate information generation unit 4043 When the connection control unit 4042 determines to execute HO, the communication rate information generation unit 4043 generates communication rate information for the wireless device 50-h that is the target of HO. h represents an integer of 1 to N.
  • the communication speed information is information related to the communication speed between the base station 40-m and the wireless device 50-h that is the target of HO.
  • the communication speed information includes a first parameter, a second parameter, and a third parameter.
  • the first parameter represents the average channel capacity T s, h (t) for communication between the radio apparatus 50-h and the base station 40-m that are the targets of HO before the execution of HO.
  • the communication speed information generating unit 4043 an average channel capacity T s, as h (t), using the average channel capacity T h (t) calculated by the scheduler section 4041 based on Equation 1.
  • the average channel capacity T s, h (t) represented by the first parameter may be expressed as the first average channel capacity.
  • the second parameter represents the total channel capacity T s (t) before execution of HO.
  • the total channel capacity T s (t) is the average channel capacity T n for communication between each radio apparatus 50 connected to the base station 40-m and the base station 40-m before HO is executed.
  • T is the sum for the radio apparatus 50 connected to the base station 40-m before the execution of HO.
  • the communication speed information generation unit 4043 calculates the total channel capacity T s (t) based on Equation 4.
  • the communication speed information generating unit 4043 as the average channel capacity formula 4 T n (t), using the average channel capacity T n (t) calculated by the scheduler section 4041 based on Equation 1.
  • the wireless device group S s is a set of wireless devices 50 connected to the base station 40-m before execution of HO.
  • the total channel capacity may be expressed as a cell channel capacity.
  • the third parameter represents an allocated resource amount (in other words, an allocated resource amount before HO) B s, h (t) for the wireless device 50-h that is a target of HO before execution of HO.
  • the allocated resource amount is an amount of radio resources allocated per unit time for communication between the radio device 50-n and the base station 40-m.
  • the allocated resource amount is an average number of RBs that is the number of RBs allocated per unit time for communication between the radio apparatus 50-n and the base station 40-m.
  • the allocated resource amount is an average bandwidth that is a bandwidth allocated per unit time for communication between the radio apparatus 50-n and the base station 40-m.
  • connection control unit 4042 determines whether or not the HO destination base station 40-q is also connected to the MME 30-p to which the base station 40-m is connected.
  • the HO request information is information that requests execution of HO.
  • the HO request information includes communication speed information generated by the communication speed information generation unit 4043.
  • the HO request information is a Handover Request message.
  • the connection control unit 4042 uses the base station 40-q according to the HO request information from the data received by the communication unit 405.
  • the transmitted HO response information is acquired.
  • the HO response information is information indicating permission to execute HO.
  • the HO response information is a Handover Request Acknowledge message.
  • the connection control unit 4042 transmits the radio reconfiguration information to the radio device 50-h connected to the base station 40-m.
  • the transmission data is generated as follows.
  • the radio reconfiguration information is information for instructing execution of connection processing for the base station 40-q that is the HO destination.
  • the radio reconfiguration information includes information for identifying the HO destination base station 40-q (for example, information for identifying a cell formed by the HO destination base station 40-q).
  • the connection process is a process for establishing a connection between the wireless device 50-n and the HO-destination base station 40-q.
  • the radio reconfiguration information is an RRC Connection Reconfiguration message.
  • connection control unit 4042 controls the communication unit 405 so that the HO necessary information is transmitted to the MME 30-p.
  • the HO required information is information for notifying that execution of HO is necessary.
  • the HO necessary information includes information for identifying the HO destination base station 40-q (for example, information for identifying a cell formed by the HO destination base station 40-q).
  • the HO necessary information includes communication speed information generated by the communication speed information generation unit 4043.
  • the HO necessary information is a Handover Required message.
  • the MME 30-p when receiving the HO necessary information from the base station 40-m, the MME 30-p specifies the MME 30-r to which the HO destination base station 40-q identified by the HO necessary information is connected. Further, the MME 30-p transmits the first transfer information to the specified MME 30-r.
  • the first transfer information is information for notifying reception of HO necessary information.
  • the first transfer information includes communication speed information included in the HO necessary information, and information for identifying the HO destination base station 40-q.
  • the first transfer information is a Forward Relocation Request message.
  • the MME 30-r when the MME 30-r receives the first transfer information from the MME 30-p, the HO request information including the communication speed information included in the first transfer information is identified by the HO identified by the first transfer information. Transmit to the previous base station 40-q.
  • the MME 30-r when the MME 30-r receives the HO response information from the base station 40-q in response to the HO request information, the MME 30-r sends the second transfer information to the MME 30-p that is the transmission source of the first transfer information. Send.
  • the second transfer information is information for notifying reception of HO response information.
  • the second transfer information is a Forward Relocation Request message.
  • the MME 30-p when the MME 30-p receives the second transfer information from the MME 30-r, the MME 30-p transmits the HO command information to the base station 40-m that is the transmission source of the HO necessary information.
  • the HO instruction information is information for instructing execution of HO.
  • the HO command information is a Handover Command message.
  • the connection control unit 4042 transmits the HO command information transmitted by the MME 30-p according to the HO necessary information from the data received by the communication unit 405. To get.
  • the connection control unit 4042 transmits the wireless reconfiguration information to the wireless device 50-h connected to the base station 40-m. Generate transmission data.
  • the base station 40-q has the same configuration as that of the base station 40-q with respect to reception of HO request information, transmission of HO response information, acquisition of communication speed information, and allocation of radio resources after execution of HO.
  • the base station 40-m has the same configuration as that of the base station 40-q with respect to reception of HO request information, transmission of HO response information, acquisition of communication speed information, and allocation of radio resources after execution of HO. Have.
  • the connection control unit 4042 controls the communication unit 405 so that the HO response information is transmitted to the base station 40-m. Further, when the base station 40-q transmits the HO response information to the base station 40-m, the connection control unit 4042 determines whether the wireless device 50-h performs a connection process executed by the wireless device 50-h according to the HO response information. 50-h is connected to base station 40-q.
  • the connection control unit 4042 controls the communication unit 405 so that the HO response information is transmitted to the MME 30-r. Further, when the base station 40-q transmits the HO response information to the MME 30-r, the connection control unit 4042 responds to the connection processing executed by the wireless device 50-h according to the HO response information, and the wireless device 50- h is connected to the base station 40-q.
  • the communication speed information acquisition unit 4044 acquires the communication speed information included in the HO request information from the data received by the communication unit 405. .
  • the communication speed information acquisition unit 4044 obtains the communication speed information included in the HO request information from the data received by the communication unit 405. get.
  • the scheduler unit may perform radio resource allocation using a predetermined value or the instantaneous channel capacity R h (t) as the average channel capacity T h (t). Conceivable.
  • the communication speed between the base station 40-q and the radio device 50-h cannot be sufficiently reflected in the radio resource allocation in the base station 40-q. Accordingly, in this case, after execution of HO, radio resources may not be allocated fairly to the radio device 50 connected to the base station 40-q.
  • the scheduler unit 4041 includes the radio device 50 connected to the base station 40-q after execution of HO, the base station, based on the communication speed information acquired by the communication speed information acquisition unit 4044. Radio resources are allocated to communications between 40-q.
  • the scheduler unit 4041 calculates the initial value Th h, ini (t) of the average channel capacity for the radio apparatus 50-h that is the target of HO based on Expression 5.
  • the wireless device 50-h targeted for HO is the wireless device 50-h newly connected to the base station 40-q as the HO is executed.
  • the initial value T h of average channel capacity for wireless device 50-h, ini (t) is the average channel capacity T h to the wireless device 50-h (t + ⁇ t) is first calculated after the execution of HO In this case, the average channel capacity T h (t) on the right side of Equation 1 is used.
  • the scheduler unit 4041 uses a total channel capacity T s of Equation 5 (t), using a second value parameter indicative included in the communication speed information.
  • the scheduler unit 4041 uses the value represented by the first parameter included in the communication speed information as the average channel capacity T s, h (t) in Equation 5.
  • the total channel capacity T t of Equation 5 (t) is the average channel capacity for communication between the wireless devices 50-n and the base station 40-q connected to the base station 40-q after execution of HO
  • T n (T) is the sum of the radio apparatus 50 connected to the base station 40-q after execution of HO.
  • the scheduler unit 4041 calculates the total channel capacity T t (t) based on Equation 6.
  • the wireless device group St is a set of wireless devices 50 connected to the base station 40-q after execution of HO.
  • the scheduler unit 4041 is calculated based on Equation 1 as the average channel capacity T v (t) for the wireless device 50-v different from the wireless device 50-h targeted for HO in Equation 6.
  • the average channel capacity T v (t) is used.
  • v represents an integer different from h among 1 to N integers.
  • the scheduler unit 4041 uses the instantaneous channel capacity R h (t) as the average channel capacity T h (t) for the wireless device 50-h that is the target of HO in Equation 6. Note that the scheduler unit 4041 may use a predetermined value as the average channel capacity T h (t) for the wireless device 50-h that is the target of HO in Equation 6.
  • the initial value Th h, ini (t) of the average channel capacity for the radio apparatus 50-h that is the target of HO may be expressed as the second average channel capacity.
  • the calculation of the initial value Th h, ini (t) of the average channel capacity for the radio apparatus 50-h that is the target of HO may be regarded as the second average channel capacity estimation.
  • the scheduler unit 4041 assigns radio resources using the initial value Th h, ini (t) of the average channel capacity for the radio device 50-h that is the target of HO after execution of HO.
  • the allocated resource amount B t, h (t) is calculated.
  • the post-HO allocation resource amount B t, h (t) is the r allocation resource amount for the radio apparatus 50-h that is the target of HO after execution of HO.
  • the scheduler unit 4041 determines that the calculated post-HO allocation resource amount B t, h (t) is a predetermined coefficient to the pre-HO allocation resource amount B s, h (t) represented by the third parameter included in the communication speed information. It is determined whether or not it is larger than a value multiplied by ⁇ (in other words, threshold value ⁇ B s, h (t)).
  • the coefficient ⁇ has a positive value. For example, the coefficient ⁇ is 1.
  • the scheduler unit 4041 determines one of the radio resources allocated to the radio apparatus 50-h that is the target of HO. Reassign parts.
  • the reassignment of the radio resource cancels the assignment of the radio resource to the radio device 50-h, and transmits the radio resource that has been deallocated to the radio device 50-v other than the radio device 50-h and the base station. Assigned to the communication with the station 40-q.
  • Reassigning radio resources may be represented as reassigning radio resources.
  • the amount of radio resources to be reassigned corresponds to a value obtained by subtracting the threshold ⁇ B s, h (t) from the post-HO assigned resource amount B t, h (t).
  • the scheduler unit 4041 allocates an amount of radio resources equal to or less than the threshold value ⁇ B s, h (t) to communication between the radio device 50-h targeted for HO and the base station 40-q. .
  • the scheduler unit 4041 replaces the formulas 5 and 6 with the initial value Th, ini (t) of the average channel capacity for the radio device 50-h that is the target of HO, based on the formulas 7 and 8. May be calculated.
  • the wireless device group S t ′ is a set obtained by excluding the wireless device 50-h that is the target of HO from the set of wireless devices 50 connected to the base station 40-q after execution of HO.
  • the radio device 50-n includes an antenna 501, a reception radio unit 502, a demodulation / decoding unit 503, a measurement unit 504, a control unit 505, an encoding modulation unit 506, and the like. And a transmission wireless unit 507.
  • the wireless device 50-n is realized by an LSI.
  • at least a part of the wireless device 50-n may be realized by PLD.
  • the wireless device 50-n includes a processing device and a storage device, and at least a part of the functions of the wireless device 50-n is realized by the processing device executing a program stored in the storage device. May be.
  • the reception radio unit 502, the demodulation decoding unit 503, the encoding modulation unit 506, and the transmission radio unit 507 are the same as the reception radio unit 402, the demodulation decoding unit 403, the encoding modulation unit 406, and the transmission radio unit 407, respectively. Composed.
  • the measurement unit 504 measures RSRP for each of the plurality of connection candidate cells based on the signal output from the reception radio unit 502.
  • the control unit 505 processes the reception data output from the demodulation / decoding unit 503. Furthermore, the control unit 505 generates transmission data and outputs the generated transmission data.
  • the control unit 505 includes a connection control unit 5051 and a quality information generation unit 5052.
  • the quality information generation unit 5052 acquires RSRQ for each of the plurality of connection candidate cells based on the reception data output by the demodulation / decoding unit 503 and the RSRP measured by the measurement unit 504. Furthermore, the quality information generation unit 5052 acquires CQI for the connected cell based on the reception data output by the demodulation / decoding unit 503 and the RSRP measured by the measurement unit 504.
  • the quality information generation unit 5052 may acquire RSRQ based only on the reception data output by the demodulation / decoding unit 503 for each of a plurality of connection candidate cells. Further, the quality information generation unit 5052 may acquire the CQI based on only the reception data output from the demodulation / decoding unit 503 for the connected cell.
  • connection control unit 5051 generates transmission data so that the measurement result is transmitted to the base station 40-m to which the wireless device 50-n is connected.
  • the measurement result includes RSRP for each of the plurality of connection candidate cells and CQI for the connection cell.
  • the connection control unit 5051 acquires the wireless reconfiguration information from the reception data output by the demodulation / decoding unit 503. In this case, the connection control unit 5051 generates transmission data so that the connection process for the HO-destination base station 40-q identified by the acquired wireless reconfiguration information is executed.
  • the base station 40-1 executes the process shown in FIG. 4 every time a predetermined period elapses in order to allocate radio resources to the radio apparatus 50 connected to the base station 40-1.
  • a description will be given of the processing shown in FIG.
  • the base station 40-1 performs first loop processing (step S101 to step S108 in FIG. 4) using each of the at least one wireless device 50 connected to the base station 40-1 as a processing target one by one. Execute.
  • first loop process for the radio apparatus 50-n to be processed will be described.
  • the base station 40-1 acquires the instantaneous channel capacity R n (t) for the radio apparatus 50-n to be processed (step S102 in FIG. 4). Next, the base station 40-1 determines that the wireless device 50-n to be processed is newly connected to the base station 40-1 as the HO is executed, so that the average channel capacity T for the wireless device 50-n is increased. It is determined whether n (t) has not been calculated (in other words, it has not been calculated yet) (step S103 in FIG. 4).
  • the base station 40-1 determines “No” in step S103, and sets the flag F n for the radio apparatus 50-n to be processed to a false value (for example, a value representing “0”) (FIG. 4 step S104).
  • the base station 40-1 calculates an average channel capacity T n (t + ⁇ t) for the radio apparatus 50-n to be processed based on Equation 1 (step S107 in FIG. 4).
  • the average channel capacity T n (t + ⁇ t) is used as the average channel capacity T n (t) at the next execution of the processing shown in FIG. In this way, the base station 40-1 executes the first loop process for the radio apparatus 50-n to be processed.
  • the base station 40-1 performs the first loop process on all of the at least one wireless device 50 connected to the base station 40-1, and then proceeds to step S109 in FIG.
  • the base station 40-1 calculates the acquired instantaneous channel capacity R n (t), and the calculated average channel capacity T n (t), based on the metric values f k for the k-th radio apparatus group S k (Step S109 in FIG. 4). Next, the base station 40-1 allocates radio resources to the radio devices 50 included in the radio device group S k having the maximum calculated metric value f k (step S110 in FIG. 4).
  • the base station 40-1 performs second loop processing (step S111 to step S116 in FIG. 4) using each of the at least one radio apparatus 50 connected to the base station 40-1 in turn as a processing target. ).
  • the second loop process for the processing target wireless device 50-n will be described.
  • the base station 40-1, the flag F n to the wireless device 50-n to be processed is judged whether it is set to a true value (step S112 in FIG. 4).
  • the true value is a value different from the false value (for example, a value representing “1”).
  • the flag F n for each wireless device 50 connected to the base station 40-1 is set to a false value. Accordingly, the base station 40-1 determines “No” in step S112. In this way, the base station 40-1 executes the second loop process for the radio apparatus 50-n to be processed.
  • the base station 40-1 performs the second loop process on all of the at least one wireless device 50 connected to the base station 40-1, and then ends the process shown in FIG. To do.
  • the base station 40-1 executes the process shown in FIG. 5 in order to determine whether or not to execute HO for the radio apparatus 50 connected to the base station 40-1.
  • the base station 40-1 executes the process shown in FIG. 5 in order to determine whether or not to execute HO for the radio apparatus 50 connected to the base station 40-1.
  • the base station 40-1 waits until it receives a measurement result from the wireless device 50-n connected to the base station 40-1 (“No” route in step S201 in FIG. 5). Then, when receiving the measurement result from the radio apparatus 50-n, the base station 40-1 determines “Yes” in step S201 of FIG. 5, and whether the HO condition is satisfied based on the received measurement result. It is determined whether or not (step S202 in FIG. 5).
  • the base station 40-1 determines “No” in Step S202, returns to Step S201 without executing the processing after Step S203, and executes the processing after Step S201 again. .
  • the base station 40-1 determines “Yes” in step S202, executes HO for the wireless device 50-n that is the transmission source of the measurement result, and sets the HO destination. Base station 40-q.
  • the base station 40-1 calculates the total channel capacity T s (t) and the pre-HO allocated resource amount B s, n (t) for the radio apparatus 50-n. Further, the base station 40-1 generates communication speed information representing the average channel capacity T n (t), the total channel capacity T s (t), and the pre-HO allocated resource amount B s, n (t). (Step S203 in FIG. 5).
  • the base station 40-1 transmits the generated communication speed information (step S204 in FIG. 5). As described above, the communication speed information is included in the HO request information or the HO necessary information. Thereafter, the base station 40-1 returns to Step S201, and again executes the processes after Step S201.
  • the radio apparatus 50-1 transmits the measurement result to the base station 40-1 (step S301 in FIG. 6).
  • the base station 40-1 determines that the HO condition is satisfied based on the measurement result received from the wireless device 50-1 (“Yes” route in step S202 in FIG. 5). As a result, the base station 40-1 decides to execute HO for the radio apparatus 50-1 and the HO-destination base station 40-2.
  • the base station 40-1 generates communication speed information for the radio apparatus 50-1 (step S203 in FIG. 5), and sends the HO request information including the generated communication speed information to the HO destination base station 40-2. Transmit (step S204 in FIG. 5 and step S302 in FIG. 6).
  • the base station 40-2 Upon receiving the HO request information from the base station 40-1, the base station 40-2 transmits HO response information to the base station 40-1 (step S303 in FIG. 6). When receiving the HO response information from the base station 40-2, the base station 40-1 transmits the wireless reconfiguration information to the wireless device 50-1 (step S304 in FIG. 6).
  • the wireless device 50-1 executes a connection process to the HO destination base station 40-2 (step S305 in FIG. 6).
  • the connection process is a process according to a random access procedure.
  • the base station 40-2 connects the wireless device 50-1 to the base station 40-2 according to the connection process.
  • the wireless device 50-1 When connected to the base station 40-2, the wireless device 50-1 transmits wireless reconfiguration completion information to the base station 40-2 (step S306 in FIG. 6).
  • the wireless reconfiguration completion information is information for notifying the completion of the connection process for the HO destination base station 40-q.
  • the radio reconfiguration completion information is an RRC Connection Reconfiguration Complete message.
  • the base station 40-2 When the base station 40-2 receives the wireless reconfiguration completion information from the wireless device 50-1, the base station 40-2 performs a route switching process on the MME 30-1 (step S307 in FIG. 6).
  • the path switching process is a process of switching a communication path between the base station 40 and the SGW 20.
  • the base station 40-2 transmits a Path Switch Request message to the MME 30-1.
  • the MME 30-1 transmits a Path Switch Request Acknowledge message to the base station 40-2.
  • the base station 40-2 When executing the path switching process, the base station 40-2 transmits release information to the base station 40-1 (step S308 in FIG. 6).
  • the release information is information instructing release of information used for communication between the radio apparatus 50-1 and the SGW 20.
  • the release information is a UE Context Release message. In this way, the HO in which the base station 40 to which the radio apparatus 50-1 is connected switches from the base station 40-1 to the base station 40-2 is executed.
  • the base station 40-2 assigns radio resources to the radio device 50 connected to the base station 40-2. Therefore, the process shown in FIG. Run every time.
  • the base station 40-2 is first represented in FIG. 4 after the HO in which the base station 40 to which the radio apparatus 50-1 is connected is switched from the base station 40-1 to the base station 40-2 is executed. A description will be given of the case of executing the processing.
  • the base station 40-2 determines “Yes” in step S103 of FIG. 4 in the first loop process for the radio apparatus 50-1 to be processed. Then, the base station 40-2 sets a flag F 1 to the wireless device 50-1 to the true value (step S105 in FIG. 4).
  • the base station 40-2 sets an initial value T 1, ini (t) of the average channel capacity for the radio apparatus 50-1 based on the communication speed information included in the HO request information received from the base station 40-1. Calculation is performed (step S106 in FIG. 4).
  • the base station 40-2 uses the calculated initial value T 1, ini (t) as the average channel capacity T 1 (t) on the right side of Equation 1, so that the average channel capacity T for the wireless device 50-1 is calculated. 1 (t + ⁇ t) is calculated (step S107 in FIG. 4). Thereby, the base station 40-2 ends the first loop process for the radio apparatus 50-1 to be processed.
  • the base station 40-2 determines “Yes” in step S112 of FIG. 4 in the second loop processing for the processing target wireless device 50-1.
  • the base station 40-2 calculates a post-HO allocation resource amount B t, 1 (t) for the radio apparatus 50-1 (step S113 in FIG. 4).
  • the base station 40-2 determines that the calculated post-HO allocation resource amount B t, 1 (t) is determined based on communication speed information included in the HO request information received from the base station 40-1. It is determined whether it is greater than s, 1 (t) (step S114 in FIG. 4).
  • the base station 40-2 determines “No” in step S114, and performs step S115 in FIG. Without executing, the second loop process for the wireless device 50-1 to be processed is terminated.
  • the base station 40-2 determines “Yes” in step S114, and the step of FIG. Proceed to S115. Then, the base station 40-2 reassigns part of the radio resources assigned to the radio device 50-1 in step S110 (step S115 in FIG. 4). Thereby, the base station 40-2 allocates an amount of radio resources equal to or less than the threshold ⁇ B s, 1 (t) to communication between the radio apparatus 50-1 and the base station 40-2. Next, the base station 40-2 ends the second loop process for the radio apparatus 50-1 to be processed.
  • the wireless communication system 1 executes the process shown in FIG. 7 instead of the process shown in FIG.
  • the base station 40-1 executes the processing shown in FIG. 4 and the processing shown in FIG. 5 in the same manner as described above.
  • the wireless device 50-1 transmits the measurement result to the base station 40-1 (step S401 in FIG. 7).
  • the base station 40-1 determines that the HO condition is satisfied based on the measurement result received from the wireless device 50-1 (“Yes” route in step S202 in FIG. 5). As a result, the base station 40-1 decides to execute HO for the radio apparatus 50-1 and the HO destination base station 40-3.
  • the base station 40-1 generates communication speed information for the radio apparatus 50-1 (step S203 in FIG. 5), and transmits HO necessary information including the generated communication speed information to the MME 30-1 (FIG. 5). Step S204 and Step S402 in FIG. 7).
  • the MME 30-1 When the MME 30-1 receives the HO necessary information from the base station 40-1, the MME 30-1 transmits the first transfer information including the communication speed information included in the HO necessary information to the MME 30-2 (Step S403 in FIG. 7). Upon receiving the first transfer information from the MME 30-1, the MME 30-2 transmits HO request information including communication speed information included in the first transfer information to the HO destination base station 40-3 (step S404 in FIG. 7). ).
  • the base station 40-3 When receiving the HO request information from the MME 30-2, the base station 40-3 transmits the HO response information to the MME 30-2 (Step S405 in FIG. 7). When receiving the HO response information from the base station 40-3, the MME 30-2 transmits the second transfer information to the MME 30-1 (Step S406 in FIG. 7).
  • the MME 30-1 Upon receiving the second transfer information from the MME 30-2, the MME 30-1 transmits HO command information to the base station 40-1 (Step S407 in FIG. 7).
  • the base station 40-1 transmits wireless reconfiguration information to the wireless device 50-1 (step S408 in FIG. 7).
  • the wireless device 50-1 executes a connection process to the HO destination base station 40-3 (step S409 in FIG. 7).
  • the base station 40-3 connects the wireless device 50-1 to the base station 40-3 according to the connection process.
  • the wireless device 50-1 When connected to the base station 40-3, the wireless device 50-1 transmits wireless reconfiguration completion information to the base station 40-3 (step S410 in FIG. 7).
  • the base station 40-3 receives the wireless reconfiguration completion information from the wireless device 50-1, the base station 40-3 performs a path switching process on the MME 30-2 (step S411 in FIG. 7).
  • the base station 40-3 When executing the path switching process, the base station 40-3 transmits release information to the base station 40-1 (step S412 in FIG. 7). In this way, the HO in which the base station 40 to which the radio apparatus 50-1 is connected switches from the base station 40-1 to the base station 40-3 is executed.
  • the base station 40-3 executes the processing shown in FIG. 4 in the same manner as the base station 40-2 in the above case.
  • the second base station 40- according to the HO from the first base station 40-1 to the second base station 40-2 or 40-3. 2 or 40-3 receives the communication speed information from the first base station 40-1.
  • the communication speed information is information relating to the communication speed between the first base station 40-1 and the first radio apparatus 50-1.
  • the second base station 40-2 or 40-3 includes at least one radio device 50 including the first radio device 50-1 connected to the second base station 40-2 or 40-3 by HO.
  • a radio resource used for communication with the second base station 40-2 or 40-3 is allocated.
  • the communication speed information can be reflected in the radio resource allocation in the second base station 40-2 or 40-3.
  • radio resources can be appropriately allocated after HO is executed. Therefore, for example, when the PF scheme is used, radio resources can be allocated fairly to the radio apparatus 50 connected to the second base station 40-2 or 40-3 after execution of HO. .
  • the communication speed information is stored in units of data communicated per unit time between the first radio apparatus 50-1 and the first base station 40-1 before execution of HO.
  • a first parameter based on a first average channel capacity, which is an average value over time, is included.
  • the second base station 40-2 or 40-3 receives a unit time between the first radio apparatus 50-1 and the second base station 40-2 or 40-3.
  • a second average channel capacity that is an average value of the amount of data communicated to the time is estimated.
  • the second base station 40-2 or 40-3 performs radio resource allocation based on the estimated second average channel capacity.
  • the second average channel capacity can be estimated with high accuracy after execution of HO.
  • radio resource allocation can be appropriately executed. Therefore, for example, when the PF scheme is used, radio resources can be allocated fairly to the radio apparatus 50 connected to the second base station 40-2 or 40-3 after execution of HO. .
  • the first parameter represents the first average channel capacity.
  • the communication speed information includes the second parameter.
  • the second parameter represents a total channel capacity that is the sum of the average channel capacity for each of the at least one wireless device connected to the first base station before execution of HO, for the at least one wireless device. .
  • the second base station 40-2 or 40-3 performs the second average channel capacity estimation based on the first parameter and the second parameter.
  • the total channel capacity is strongly correlated with the second average channel capacity. Therefore, according to the wireless communication system 1, the second average channel capacity can be estimated with high accuracy after execution of HO.
  • the communication speed information is the amount of radio resources allocated for communication between the first radio apparatus 50-1 and the first base station 40-1 before execution of HO.
  • a third parameter representing a certain allocated resource amount is included.
  • the second base station 40-2 or 40-3 has the amount of radio resources equal to or less than the value obtained by multiplying the allocated resource amount represented by the third parameter by the coefficient, between the first radio apparatus 50-1 and the second base station. Radio resource allocation is performed so as to be allocated for communication with the station 40-2 or 40-3.
  • the average channel capacity of one may be significantly smaller than the second average channel capacity.
  • the amount of allocated resources for communication between the radio apparatus 50 and the second base station 40-2 or 40-3 may become excessive. .
  • the allocation resource amount for communication between the first radio apparatus 50-1 and the second base station 40-2 or 40-3 is allocated before the HO is executed.
  • the amount can be suppressed to a value equal to or less than the value according to the resource amount. Therefore, it is possible to suppress an excessive amount of allocated resources for communication between the first radio apparatus 50-1 and the second base station 40-2 or 40-3.
  • the scheduler unit 4041 may calculate the initial value Th h, ini (t) of the average channel capacity for the radio apparatus 50-h that is the target of HO based on Expression 9 instead of Expression 5. .
  • the value ⁇ h (t) in Expression 9 is expressed by Expression 10.
  • the first parameter may represent a value ⁇ h (t) obtained by dividing the average channel capacity T s, h (t) by the total channel capacity T s (t).
  • the communication speed information may not include the second parameter.
  • the value ⁇ h (t) obtained by dividing the average channel capacity T s, h (t) by the total channel capacity T s (t) has a strong correlation with the second average channel capacity. Therefore, according to the wireless communication system 1, the second average channel capacity can be estimated with high accuracy after execution of HO.
  • the radio communication system according to the second embodiment is different from the radio communication system according to the first embodiment in that radio resources are not reassigned.
  • the difference will be mainly described.
  • symbol used in 1st Embodiment is the same or substantially the same.
  • the base station 40 executes a process in which the processes in steps S111 to S116 are deleted from the process illustrated in FIG. 4, instead of the process illustrated in FIG. .
  • the communication speed information may not include the third parameter.
  • the communication speed information is assigned to the wireless resource allocation in the second base station 40-2 or 40-3. Can be reflected. As a result, radio resources can be appropriately allocated after HO is executed.
  • the wireless communication system of the third embodiment is different from the wireless communication system of the first embodiment in that the total channel capacity is not used for calculating the initial value of the average channel capacity.
  • the difference will be mainly described.
  • symbol used in 1st Embodiment is the same or substantially the same.
  • the scheduler unit 4041 replaces the mathematical expressions 5 and 6 with the initial value T of the average channel capacity for the wireless device 50-h that is the target of HO based on the mathematical expression 11. h, ini (t) is calculated.
  • the communication speed information may not include the second parameter.
  • the communication speed information is assigned to the allocation of radio resources in the second base station 40-2 or 40-3. Can be reflected. As a result, radio resources can be appropriately allocated after HO is executed.
  • a wireless communication system according to the fourth embodiment will be described.
  • the radio communication system according to the fourth embodiment is different from the radio communication system according to the third embodiment in that radio resources are not reassigned.
  • the difference will be mainly described.
  • symbol used in 3rd Embodiment is the same or substantially the same.
  • the base station 40 executes a process in which the processes in steps S111 to S116 are deleted from the process illustrated in FIG. 4, instead of the process illustrated in FIG. .
  • the communication speed information may not include the third parameter.
  • the communication speed information is assigned to the wireless resource allocation in the second base station 40-2 or 40-3 after execution of HO. Can be reflected. As a result, radio resources can be appropriately allocated after HO is executed.
  • a wireless communication system according to a fifth embodiment will be described.
  • the wireless communication system according to the fifth embodiment is different from the wireless communication system according to the first embodiment in that the initial value of the average channel capacity is not calculated based on the communication speed information.
  • the difference will be mainly described.
  • symbol used in 1st Embodiment is the same or substantially the same.
  • the base station 40 executes a process in which the processes in steps S103 to S106 are deleted from the process illustrated in FIG. 4 instead of the process illustrated in FIG. .
  • the communication speed information may not include the first parameter.
  • the communication speed information may not include the second parameter.
  • the scheduler section 4041 when calculating the average channel capacity T h to the wireless device 50-h as the object of HO (t + ⁇ t), the first after the execution of the HO, the average channel capacity on the right side of Equation 1 A predetermined value is used as T h (t).
  • the scheduler unit 4041 may use the instantaneous channel capacity R h (t) as the average channel capacity T h (t) on the right side of Equation 1.
  • the communication speed information is assigned to the radio resource allocation in the second base station 40-2 or 40-3. Can be reflected. As a result, radio resources can be appropriately allocated after HO is executed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication sans fil (1) qui comprend une pluralité de dispositifs sans fil (50) comprenant un premier dispositif sans fil (50), et une première station de base (40) et une seconde station de base (40) qui communiquent sans fil avec la pluralité de dispositifs sans fil (50). Le système de communication sans fil (1) comprend une unité de réception et une unité de commande. L'unité de réception reçoit des informations relatives à la vitesse de communication entre la première station de base (40) et le premier dispositif sans fil (50) à partir de la première station de base (40) en réponse à un transfert de commutation de la première station de base (40) à la seconde station de base (40) par rapport à une station de base (40), à laquelle le premier dispositif sans fil (50) est connecté. L'unité de commande attribue une ressource sans fil à utiliser pour une communication entre la seconde station de base (40) et au moins un dispositif sans fil (50) qui comprend le premier dispositif sans fil (50), connecté à la seconde station de base (40) par le transfert.
PCT/JP2016/068521 2016-06-22 2016-06-22 Système de communication sans fil, procédé de communication sans fil et station de base Ceased WO2017221349A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009017168A1 (fr) * 2007-07-31 2009-02-05 Ntt Docomo, Inc. Dispositif de station de base et procédé dans un système de communication mobile
WO2011125131A1 (fr) * 2010-04-09 2011-10-13 株式会社日立製作所 Système de communication sans fil
JP2012004950A (ja) * 2010-06-18 2012-01-05 Hitachi Ltd 基地局、及び、無線通信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009017168A1 (fr) * 2007-07-31 2009-02-05 Ntt Docomo, Inc. Dispositif de station de base et procédé dans un système de communication mobile
WO2011125131A1 (fr) * 2010-04-09 2011-10-13 株式会社日立製作所 Système de communication sans fil
JP2012004950A (ja) * 2010-06-18 2012-01-05 Hitachi Ltd 基地局、及び、無線通信方法

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