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WO2012014468A1 - Station de base et procédé de transfert intercellulaire - Google Patents

Station de base et procédé de transfert intercellulaire Download PDF

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Publication number
WO2012014468A1
WO2012014468A1 PCT/JP2011/004255 JP2011004255W WO2012014468A1 WO 2012014468 A1 WO2012014468 A1 WO 2012014468A1 JP 2011004255 W JP2011004255 W JP 2011004255W WO 2012014468 A1 WO2012014468 A1 WO 2012014468A1
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WIPO (PCT)
Prior art keywords
base station
communication terminal
wireless communication
lte
state
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PCT/JP2011/004255
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English (en)
Japanese (ja)
Inventor
康二 鳴島
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Kyocera Corp
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Kyocera Corp
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Publication of WO2012014468A1 publication Critical patent/WO2012014468A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements

Definitions

  • the present invention relates to a base station and a handover method.
  • LTE Long Term Evolution
  • UE User : Equipment
  • eNB evolved Node B
  • EPC Evolved Packet Core
  • a wireless communication terminal has two types of states, an RRC_IDLE state and an RRC_CONNECTED state.
  • the RRC_IDLE state refers to a state in which radio resources are not managed by the base station.
  • the RRC_CONNECTED state refers to a state in which radio resources are managed by the base station and the radio communication terminal can always perform data communication.
  • a handover when the wireless communication terminal is in the RRC_CONNECTED state will be described with reference to FIG.
  • a wireless communication terminal receives radio waves from a base station as a communication destination and adjacent base stations A and B adjacent to the base station, and measures communication quality (for example, radio wave intensity) (Measurement). Then, the wireless communication terminal transmits the measurement result to the base station which is the communication destination by a measurement report (Measurement Report) message. Then, the base station that has received the measurement report message determines which adjacent base station is to be handed over based on the radio wave intensity and the radio resource information of the measurement report message. After the handover destination is determined (in FIG. 8, the handover destination is determined to be the adjacent base station A), the wireless communication terminal and the handover destination base station (adjacent base station A) start a handover procedure (handover procedure).
  • communication quality for example, radio wave intensity
  • the wireless communication terminal transmits the measurement result to the base station which is the communication destination by a measurement report (Measurement Report) message. Then, the base station that has received the measurement report message determines which adjacent base station is to be handed
  • the timing at which the wireless communication terminal transmits the measurement report message is determined based on a transmission trigger set in the wireless communication terminal.
  • a transmission trigger There are two types of transmission triggers that determine the transmission timing of the measurement report message.
  • the transmission trigger is transmitted only when a specific radio wave condition is satisfied, a “periodic type trigger” that the wireless communication terminal transmits at regular intervals.
  • the wireless communication terminal transmits the measurement report message at a specified period T as shown in FIG.
  • a base station can set to a radio
  • the wireless communication terminal transmits the measurement report message to the base station only when a transmission trigger condition (for example, radio wave condition) is satisfied as shown in FIG. Send to.
  • a transmission trigger condition for example, radio wave condition
  • the event type trigger will be described in more detail.
  • An Intra-LTE handover is a handover in the LTE system
  • an Inter-RAT (Radio-Access-Technology) handover is a handover between different wireless communication systems.
  • the LTE system and the HRPD HRPD ( This is a handover between a high rate packet data (high-speed packet data) system or a CDMA (code division multiple access) system.
  • the LTE serving cell (LTE Serving Cell) is an LTE system base station that establishes a radio link with a radio communication terminal.
  • the LTE neighboring cell is a base station of the LTE system that is adjacent to the serving cell.
  • Inter-RAT Inter-Radio Access Technology
  • the transmission triggers of events A1, A2, and A5 are used for Intra-LTE handover between LTE systems.
  • Event B2 is used for an Inter-RAT handover from an LTE system base station to an Inter-RAT neighboring cell of another wireless communication system.
  • the base station can set a threshold for each wireless communication terminal for each trigger.
  • conditional expression event A5 Over time, as in FIG. 11, when the radio wave strength of the serving cell and the adjacent cell has changed, so that the conditional expression event A5 is filled at time t a. That is, at time t a, so that the Intra-LTE handover from LTE serving cell to LTE neighbor cell is started.
  • the base station that is the communication destination of the wireless communication terminal changes, and accordingly, the transmission trigger for the measurement report message set in the wireless communication terminal needs to be reset.
  • the base station transmits an RRCConnectionReconfiguration message to the wireless communication terminal as shown in FIG.
  • the RRCConnectionReconfiguration message includes information such as the type of trigger to be set by the wireless communication terminal, the period value of the periodic trigger, or the threshold value of the event type trigger.
  • the wireless communication terminal sets a new transmission trigger based on the received RRCConnectionReconfiguration message.
  • the wireless communication terminal performs an intra-LTE handover between LTE systems using the radio field strength of the base station measured in the LTE system.
  • an Inter-RAT handover from an LTE system to an Inter-RAT neighboring cell of another wireless communication system for example, HRPD system
  • it is necessary to measure the radio field strength of the base station of the other wireless communication system There is.
  • the radio communication terminal cannot measure the radio field intensity of the base station of another radio communication system in a state corresponding to the LTE system due to a difference in communication method. Therefore, as shown in FIG.
  • the wireless communication terminal periodically allocates a part of the subframe (Sub Frame) in the LTE system to the measurement of the radio field strength of the base station of the other system (Measurement), and temporarily Switch to another communication method.
  • This allocated section is called a measurement gap (Measurement Gap).
  • the conventional handover method is configured to enable not only intra-LTE handover between LTE systems but also Inter-RAT handover from the LTE system to other wireless communication systems. Must be set.
  • an object of the present invention which has been made in view of the above-described problems of the prior art, is to provide a base station and a handover method capable of changing the measurement gap setting.
  • the base station In the base station of the first system that communicates with the wireless communication terminal, A transmission / reception unit that receives communication quality between the wireless communication terminal and an adjacent base station of the first system adjacent to the own station and the own station; A control unit for controlling the transmission / reception unit, When the communication quality is equal to or higher than a first threshold, the control unit sends a message to the wireless communication terminal that the communication quality measurement of a base station of a second system different from the first system is not permitted from the transmission / reception unit. It controls to transmit.
  • the control unit determines that the communication quality between the base station and the adjacent base station of the first system is less than the first threshold value. If there, -Causing the wireless communication terminal to transmit a message to the transmitter / receiver to permit the communication quality measurement of the base station of the second system; -If the communication quality of the base station of the second system received via the transceiver is equal to or higher than a second threshold higher than the first threshold, the base station of the second system is It is desirable to determine the handover destination.
  • the solution of the present invention has been described as an apparatus.
  • the present invention can be realized as a method, a program, and a storage medium that stores the program substantially corresponding to these, and the scope of the present invention. It should be understood that these are also included.
  • the handover method was realized first invention as a method, In a handover method from a base station of a first system with which a wireless communication terminal is communicating to a base station of a second system different from the first system, When the communication quality of the base station of the first system or the adjacent base station of the first system adjacent to the base station is equal to or higher than a first threshold, the wireless communication terminal is connected to the base station of the second system. This includes the step of not measuring the communication quality.
  • the radio field strengths of the base station of the first system and the adjacent base station of the first system adjacent to the base station are both less than the first threshold value.
  • FIG. 1 is a schematic communication network diagram according to an embodiment of the present invention.
  • FIG. 2 is a functional block diagram showing a schematic configuration of the base station of the first system according to the embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a relationship between a transmission trigger, a state of a wireless communication terminal, and a handover between base stations according to an embodiment of the present invention.
  • FIG. 4 is a flowchart showing processing of the LTE serving cell when the state of the wireless communication terminal is STATE_SERV according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_NEIGHBOR according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_WEAK according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a relationship between radio field intensity and time of an LTE serving cell, an LTE adjacent cell, and an HRPD adjacent cell according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a conventional handover method.
  • FIG. 9 is a diagram illustrating measurement report message transmission by a periodic trigger.
  • FIG. 10 is a diagram illustrating measurement report message transmission by an event type trigger.
  • FIG. 11 is a diagram showing the relationship between event A5 and handover.
  • FIG. 12 is a diagram illustrating RRCConnectionReconfiguration message transmission.
  • FIG. 13 is a diagram illustrating a measurement gap in the LTE subframe.
  • FIG. 1 is a schematic communication network diagram according to an embodiment of the present invention.
  • the communication network 11 includes a base station 101 of the first system, a base station (adjacent base station in the claims) 103 adjacent to the base station 101, and a base station 105 of the second system adjacent to the base station 101. And a wireless communication terminal 107.
  • An area 111 indicates a range (cell) in which radio waves of the base station 101 can reach.
  • An area 113 indicates a range in which radio waves from the base station 103 can reach.
  • a region 115 indicates a range where radio waves from the base station 105 can reach. That is, the area A where the areas 111, 113, and 115 overlap means that radio waves from the three base stations 101, 103, and 105 reach.
  • the first system is an LTE system and the second system is an HRPD system, but the present invention is not limited to this.
  • an LTE system can be selected as the first system
  • a CDMA system can be selected as the second system.
  • base station 101 communicating with radio communication terminal 107 is LTE serving cell
  • LTE system base station 103 adjacent to LTE serving cell is LTE adjacent cell
  • base station 105 of HRPD system adjacent to LTE serving cell is HRPD adjacent.
  • Each cell is referred to as a cell.
  • FIG. 1 shows only one LTE adjacent cell and one HRPD adjacent cell, the present invention is not limited to one, and a plurality of adjacent cells may exist.
  • FIG. 2 is a functional block diagram showing a schematic configuration of the base station of the first system according to the embodiment of the present invention.
  • the base station 101 of the present invention includes a transmission / reception unit 121 and a control unit 123.
  • the transmission / reception unit 121 transmits / receives various data to / from the wireless communication terminal 107.
  • the transmission / reception unit 121 receives a measurement report message from the wireless communication terminal 107 or transmits an RRCConnectionReconfiguration message to the wireless communication terminal.
  • the measurement report message includes the communication quality of the base station measured by the wireless communication terminal 107, such as information on the radio wave intensity (RSSI: Received Signal Strength Indicator) and the carrier level to interference noise ratio (CINR: Carrier Noise to Interference Noise and Noise Ratio). It is a waste.
  • RSSI Received Signal Strength Indicator
  • CINR Carrier Noise to Interference Noise and Noise Ratio
  • the radio communication terminal 107 can measure the radio field strength of a base station capable of communication, and the radio communication terminal 107 located in the cell of the base station 101 measures the radio field strength of the base station 101 as shown in FIG. can do. In addition, when the wireless communication terminal 107 moves to the area A, the wireless communication terminal 107 can measure the radio field intensity of the base stations 101, 103, and 105.
  • the RRCConnectionReconfiguration message includes information on a transmission trigger that determines the timing at which the wireless communication terminal 107 transmits a measurement report message to the base station.
  • the transmission trigger of this embodiment includes the periodic trigger and the four triggers shown in Table 1. Suppose that it is an event type trigger.
  • the control unit 123 controls and manages the entire base station 101 including each functional block of the base station 101.
  • the control unit 123 is configured as software executed on an arbitrary suitable processor such as a CPU (Central Processing Unit), or a dedicated processor specialized for each process (for example, DSP (Digital Signal Processor)). Can be configured.
  • a CPU Central Processing Unit
  • DSP Digital Signal Processor
  • the wireless communication terminal 107 Before describing the operation of the base station 101 according to an embodiment of the present invention, the wireless communication terminal 107 according to the priority of the base station of the communication destination (handover destination) of the wireless communication terminal 107 and the radio field strength of the base station. The state will be described.
  • the priority of the communication destination base station of the wireless communication terminal 107 will be described with reference to FIG. 1 and Table 2. As shown in FIG. 1, it is assumed that the wireless communication terminal 107 moves to a region A where radio waves reach from the base stations 101, 103, and 105 while communicating with the base station 101. Since the wireless communication terminal 107 has moved to the area A, it can maintain communication with the base station 101 and can be handed over to the base station 103 or 105. At this time, the priority of the communication destination base station of the wireless communication terminal 107 is determined as shown in Table 2. “1” in Table 2 has the highest priority, and “3” has the lowest priority. Since the handover places a load on the network, consumes power, and causes data loss and delay, the number of handovers should be small. Therefore, the base station 101 (LTE serving cell) that is currently communicating with the radio communication terminal 107, that is, managing the radio resources of the radio communication terminal, is set as the highest priority base station. That is, no handover is performed.
  • LTE serving cell LTE serving
  • the handover destination is the LTE system base station 103 (LTE adjacent cell) adjacent to the LTE serving cell or the HRPD system base station 105 (HRPD adjacent cell) adjacent to the LTE serving cell. Since the LTE system has a higher throughput value than the HRPD system, the LTE neighboring cell is set as the second highest priority base station as the communication destination. The base station with the lowest priority is set as the HRPD neighboring cell.
  • the wireless communication terminal 107 can assume three states: STATE_SERVE, STATE_NEIGHBOR, and STATE_WEAK.
  • STATE_SERV is when the radio field strength of the LTE serving cell is greater than or equal to the threshold value a, or when the radio field strength of the LTE serving cell is greater than or equal to the threshold value c and less than the threshold value a and the radio field strength of the LTE adjacent cell is less than the threshold value c (the first threshold value in the claims).
  • the state of the wireless communication terminal 107 is indicated.
  • STATE_NEIGHBOR indicates the state of the radio communication terminal 107 when the radio field strength of the LTE serving cell is less than the threshold value a and the radio field strength of the LTE adjacent cell is greater than or equal to the threshold value c.
  • STATE_WEAK indicates the state of the radio communication terminal 107 when the radio field strengths of the LTE serving cell and the LTE adjacent cell are both less than the threshold value c.
  • transmission triggers for different measurement report messages are set depending on the state.
  • event A2 is set.
  • STATE_NEIGHBOR events A1 and A5 and a periodic trigger are set.
  • Event A1 means that a measurement report message is transmitted when the radio field strength of the LTE serving cell becomes equal to or greater than the threshold value a.
  • Event A2 means that a measurement report message is transmitted when the radio field strength of the LTE serving cell becomes less than the threshold value a.
  • Event A5 means that a measurement report message is transmitted when the radio field strength of the LTE adjacent cell is equal to or greater than the threshold value b (second threshold value in the claims) and the radio field strength of the LTE serving cell is less than the threshold value c.
  • Event B2 means that a measurement report message is transmitted when the radio field intensity of the HRPD adjacent cell is equal to or greater than the threshold value b and the radio field intensity of the LTE serving cell is less than the threshold value c.
  • the threshold value is set lower in the order of a, b, and c.
  • the base station 101 receives the measurement report message due to the activation of the event A2, and determines whether or not the state of the wireless communication terminal 107 has transitioned from STATE_SERV to STATE_NEIGHBOR from the radio wave intensity information of the message. Further, the base station 101 recognizes that the state of the wireless communication terminal 107 has transitioned from STATE_NEIGHBOR to STATE_SERV upon reception of the measurement report message upon activation of the event A1.
  • the base station 101 determines that the base station 101 (LTE serving cell) should perform handover to the base station 103 (LTE neighboring cell) by receiving the measurement report message due to the activation of the event A5. In addition, the base station 101 determines that a handover from the base station 101 (LTE serving cell) to the base station 105 (HRPD neighboring cell) is to be performed by receiving the measurement report message due to the activation of the event B2. Further, when the state of the wireless communication terminal 107 is STATE_NEIGHBOR or STATE_WEAK, the base station 101 receives a measurement report message at a constant cycle by a periodic trigger. Thereby, the base station 101 recognizes the transition between STATE_NEIGHBOR and STATE_WEAK of the wireless communication terminal 107 and the transition from STATE_NEIGHBOR or STATE_WEAK to STATE_SERV.
  • the wireless communication terminal 107 unless the wireless communication terminal 107 becomes STATE_NEIGHBOR, the handover from the base station 101 to the base station 103 is not executed. Further, unless the state of the wireless communication terminal 107 becomes STATE_WEAK, handover from the base station 101 to the base station 105 (HRPD adjacent cell) is not executed. Therefore, the priorities shown in Table 2 are realized by the three states of the wireless communication terminal 107 and the transmission trigger assigned to each state.
  • the base station 101 Since the priority is determined, the base station 101 does not use the radio field strength information of the HRPD neighboring cell unless the state of the wireless communication terminal 107 is STATE_WEAK. Therefore, the base station 101 sends a message to the effect that the radio field strength measurement of the HRPD neighboring cell is not permitted to the wireless communication terminal 107 of STATE_SERV and STATE_NEIGHBOR.
  • the message not permitting the measurement of the radio field intensity is a message not permitting the setting of the measurement gap.
  • the wireless communication terminal 107 does not set the measurement gap for measuring the radio field strength of the HRPD adjacent cell until the state of the wireless communication terminal 107 becomes STATE_WEAK by the reception of the message, and the measurement gap is already set. If so, delete the measurement gap.
  • FIG. 4 is a flowchart showing processing of the LTE serving cell when the state of the wireless communication terminal is STATE_SERV according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_NEIGHBOR according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_WEAK according to an embodiment of the present invention.
  • FIG. 4 is a flowchart showing processing of the LTE serving cell when the state of the wireless communication terminal is STATE_SERV according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_NEIGHBOR according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating processing of the LTE serving cell when the state of the wireless communication terminal is STATE_WEAK according to an embodiment of
  • FIG. 7 is a diagram illustrating a relationship between radio field intensity and time of an LTE serving cell, an LTE adjacent cell, and an HRPD adjacent cell according to an embodiment of the present invention. 4 to 7, it is assumed that the wireless communication terminal 107 is located in the area A in FIG. 1 and can measure the radio field intensity of the base stations 101, 103, and 105.
  • the event A2 is set as the transmission trigger of the measurement report message of the wireless communication terminal 107.
  • the control unit 123 of the base station 101 controls the transmission / reception unit 121 to send a message to the wireless communication terminal 107 that the setting of the measurement gap for measuring the radio field intensity of the HRPD adjacent cell is not permitted (step S101). That is, the base station 101 instructs the wireless communication terminal 107 to measure only the radio field strength of the base stations 101 and 103 of the LTE system.
  • the wireless communication terminal 107 measures the radio field intensity of the base station 101 and the base station 103. Since the wireless communication terminal 107 does not measure the radio field intensity of the base station 105 of the HRPD system, there is no need to set a measurement gap. Radio wave intensity of the base station 101 (LTE serving cell) at time t 1 is less than the threshold a, the condition of the event A2 are satisfied. At this time, the wireless communication terminal 107 sends the measurement result to the base station 101 as a measurement report message.
  • the control unit 123 acquires the radio field strengths of the base station 101 (LTE serving cell) and the base station 103 (LTE neighboring cell) from the measurement report message (step S103). .
  • the control unit 123 determines whether the radio field strength of the LTE serving cell is less than the threshold value a and the radio field strength of the LTE adjacent cell is greater than or equal to the threshold value c (step S104). When the condition of step S104 is satisfied, the control unit 123 determines that the state of the wireless communication device 107 has transitioned from STATE_SERV to STATE_NEIGHBOR (step S105). Since it is necessary to change the transmission trigger according to the change in the state, the control unit 123 includes the information on the transmission trigger (events A1 and A5 and the periodic trigger) to be changed in the RRCConnectionReconfiguration message, and transmits and receives the message. It is made to transmit to 121 (step S106). The wireless communication terminal 107 receives the RRCConnectionReconfiguration message and changes the transmission trigger from event A2 to events A1 and A5 and a periodic trigger.
  • the control unit 123 of the base station 101 sends the radio communication terminal 107 to the radio field strength of the HRPD adjacent cell.
  • the transmitter / receiver 121 is controlled so as to send a message indicating that the measurement gap for measurement is not permitted to be set (step S201).
  • the wireless communication terminal 107 measures the radio field intensity of the base station 101 and the base station 103. Since the wireless communication terminal 107 does not measure the radio field intensity of the base station 105 of the HRPD system, there is no need to set a measurement gap. When the trigger condition of any one of the events A1, A5 or the periodic trigger is satisfied, the wireless communication terminal 107 transmits the measurement result to the base station 101 as a measurement report message.
  • the control unit 123 acquires the radio field strengths of the base station 101 (LTE serving cell) and the base station 103 (LTE neighboring cell) from the measurement report message (step S203). .
  • the control unit 123 determines whether or not the radio field intensity of the base station 101 (LTE serving cell) is greater than or equal to the threshold value a, or the radio field intensity of the base station 101 is greater than or equal to the threshold value c and less than the threshold value a. It is determined whether or not the intensity is less than a threshold value c (step S204). When the condition of step S204 is satisfied, the control unit 123 determines that the state of the wireless communication terminal 107 has transitioned from STATE_NEIGHBOR to STATE_SERV (step S205).
  • the control unit 123 Since it is necessary to change the transmission trigger in accordance with the change in the state, the control unit 123 includes the information on the transmission trigger (event A2) to be changed in the RRCConnectionReconfiguration message, and causes the transmission / reception unit 121 to transmit the message (Step S1). S206).
  • the wireless communication terminal 107 receives the RRCConnectionReconfiguration message, and changes the transmission trigger from the events A1 and A5 and the periodic trigger to the event A2.
  • the control unit 123 determines whether the radio field intensity of the base station 101 (LTE serving cell) is less than the threshold value c and the radio field intensity of the base station 103 (LTE neighboring cell) is greater than or equal to the threshold value b. (Step S207). When the condition of step S207 is satisfied, the control unit 123 determines the base station 103 (LTE neighboring cell) as a handover destination (step S208). The wireless communication terminal 107 communicates with the base station 103 by the handover procedure.
  • step S207 determines whether the radio field strengths of the base station 101 (LTE serving cell) and the base station 103 (LTE adjacent cell) are less than the threshold value c (step S209).
  • step S209 determines that the state of the wireless communication terminal 107 has transitioned from STATE_NEIGHBOR to STATE_WEAK (step S210).
  • the state of the wireless communication terminal 107 from the time t 2 in FIG. 7 is a STATE_WEAK.
  • the control unit 123 Since the transmission trigger needs to be changed according to the change in state, the control unit 123 includes the information on the transmission trigger (events A1 and B2 and the periodic trigger) to be changed in the RRCConnectionReconfiguration message, and transmits and receives the message. It is made to transmit to 121 (step S206).
  • the wireless communication terminal 107 receives the RRCConnectionReconfiguration message, and changes the transmission trigger from the events A1 and A5 and the periodic trigger to the events A1 and B2 and the periodic trigger.
  • the control unit 123 of the base station 101 causes the wireless communication terminal 107 to
  • the transmitter / receiver 121 is controlled so as to send a message to permit setting of a measurement gap for cell radio wave intensity measurement (step S301).
  • the wireless communication terminal 107 measures the radio field intensity of the base station 101, the base station 103, and the base station 105.
  • the wireless communication terminal 107 needs to set a measurement gap in order to measure the radio field intensity of the base station 105 of the HRPD system.
  • the wireless communication terminal 107 transmits the measurement result to the base station 101 as a measurement report message.
  • the control unit 123 determines the base station 101 (LTE serving cell), the base station 103 (LTE adjacent cell), and the base station 105 (HRPD adjacent cell) from the measurement report message. Radio wave intensity is acquired (step S303).
  • the control unit 123 determines whether or not the radio field intensity of the base station 101 (LTE serving cell) is greater than or equal to the threshold value a, or the radio field intensity of the base station 101 is greater than or equal to the threshold value c and less than the threshold value a. It is determined whether or not the intensity is less than a threshold value c (step S304). When the condition of step S304 is satisfied, the control unit 123 determines that the state of the wireless communication terminal 107 has transitioned from STATE_WEAK to STATE_SERV (step S305).
  • the control unit 123 Since it is necessary to change the transmission trigger in accordance with the change in the state, the control unit 123 includes the information on the transmission trigger (event A2) to be changed in the RRCConnectionReconfiguration message, and causes the transmission / reception unit 121 to transmit the message (Step S1). S306).
  • the wireless communication terminal 107 receives the RRCConnectionReconfiguration message, and changes the transmission trigger from the events A1 and B2 and the periodic trigger to the event A2.
  • step S304 when the radio field intensity of the base station 101 is less than the threshold value a (No in step S304), the control unit 123 determines that the radio field intensity of the base station 101 (LTE serving cell) and the base station 103 (LTE adjacent cell) is the threshold value. It is determined whether it is less than c (step S307).
  • step S307 When the condition of step S307 is not satisfied, the radio field strength of the base station 103 (LTE adjacent cell) is equal to or greater than the threshold value c, and therefore the control unit 123 determines that the state of the wireless communication terminal 107 has transitioned from STATE_WEAK to STATE_NEIGHBOR ( Step S308). Since it is necessary to change the transmission trigger according to the change in the state, the control unit 123 includes the information on the transmission trigger (events A1 and A5 and the periodic trigger) to be changed in the RRCConnectionReconfiguration message, and transmits and receives the message. 121 is transmitted (step S306). The wireless communication terminal 107 receives the RRCConnectionReconfiguration message, and changes the transmission trigger from the events A1 and B2 and the periodic trigger to the events A1 and A5 and the periodic trigger.
  • step S307 when the radio field strengths of the base station 101 and the base station 103 are less than the threshold value c (Yes in step S307), the control unit 123 determines whether the radio field strength of the base station 105 (HRPD serving cell) is greater than or equal to the threshold value b. Is determined (step S309).
  • the base station 105 When the radio field intensity of the base station 105 is greater than or equal to the threshold value b (Yes in step S309), the base station 105 (HRPD adjacent cell) is determined as a handover destination (step S310). By the handover procedure, the wireless communication terminal 107 would communicate with the base station 105 from t 3 in FIG.
  • the control unit 123 has the radio field intensity of the base station 101 (LTE serving cell) of the LTE system or the base station 103 (LTE adjacent cell) of the LTE system adjacent to the base station 101 equal to or greater than the threshold value c. Then, the transmitter / receiver 121 is controlled so as to transmit to the wireless communication terminal 107 a message indicating that the setting of the measurement gap for measuring the radio field intensity of the base station 105 (HRPD adjacent cell) of the HRPD system is not permitted. That is, the radio communication terminal 107 does not need to set a measurement gap in order to measure the radio field intensity of the HRPD adjacent cell until both the radio field intensity of the LTE serving cell and the LTE adjacent cell are less than the threshold value c. Communication in is not interrupted. Therefore, it is possible to prevent a reduction in communication throughput in the LTE system.
  • the control unit 123 instructs the radio communication terminal 107 to transmit the base station 101 (LTE serving cell) and the base station 103 (LTE neighboring cell) of the LTE system to the radio communication terminal 107 when the radio field intensity is less than the threshold value c.
  • the transmission / reception unit 121 is controlled so as to send a message permitting the setting of the measurement gap for measuring the radio field intensity of the station 105 (HRPD adjacent cell).
  • the control unit 123 determines the base station 105 as the handover destination of the radio communication terminal 107 when the radio field intensity of the base station 105 received via the transmission / reception unit 121 is equal to or higher than the threshold value b higher than the threshold value c.
  • the handover from the LTE serving cell to the HRPD neighboring cell is not executed unless the radio field strength of the HRPD neighboring cell is equal to or greater than the threshold value b. . If the radio field strength of the LTE neighboring cell becomes equal to or greater than the threshold value c (c ⁇ b) before the radio field strength of the HRPD neighboring cell exceeds the threshold value b, the measurement of the radio field strength of the HRPD neighboring cell is interrupted, and the HRPD neighboring cell from the LTE serving cell. There is no possibility of a handover to the cell being performed.
  • the conditions for executing handover to the HRPD neighboring cell are stricter than the conditions for performing handover to the LTE neighboring cell. Therefore, it is possible to avoid unnecessarily performing handover to the base station of the HRPD system having a smaller throughput value than the LTE system.
  • each member, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined into one or divided. Is possible.

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

Abstract

L'invention concerne une station de base capable de modifier des paramètres d'intervalle de mesure, et concerne également un procédé de transfert intercellulaire. Une station de base (101) qui appartient à un premier système et communique avec un terminal de communication sans fil (107) comprend : une unité d'émission/réception (121) qui reçoit, à partir du terminal de communication sans fil (107), la qualité de communication entre la station proprement dite (101) et une station de base adjacente (103) qui appartient au premier système et est adjacente à la station proprement dite (101) ; et un contrôleur (123) qui exécute un contrôle de telle manière que, lorsque la qualité de communication est égale ou supérieure à une première valeur de seuil, un message de désactivation d'une mesure de qualité de communication d'une station de base (105) appartenant à un deuxième système qui diffère du premier système est transmis depuis l'unité d'émission/réception (121) jusqu'au terminal de communication sans fil (107).
PCT/JP2011/004255 2010-07-28 2011-07-27 Station de base et procédé de transfert intercellulaire Ceased WO2012014468A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-169731 2010-07-28
JP2010169731A JP2012034048A (ja) 2010-07-28 2010-07-28 基地局及びハンドオーバ方法

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WO2012014468A1 true WO2012014468A1 (fr) 2012-02-02

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JP6304926B2 (ja) 2013-01-17 2018-04-04 Kddi株式会社 通信制御装置、無線基地局装置、無線端末装置および通信制御方法
JP6306006B2 (ja) * 2013-07-09 2018-04-04 京セラ株式会社 ネットワーク装置及びユーザ端末
JP6557276B2 (ja) * 2017-04-28 2019-08-07 Kddi株式会社 飛行体
CN110476455B (zh) 2017-04-28 2021-10-26 Kddi株式会社 无线通信装置、通信控制方法和计算机程序

Citations (1)

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JP2003501910A (ja) * 1999-05-26 2003-01-14 ノキア コーポレイション セルラーネットワークのターミナルにおいて信号電力レベルの測定を開始する方法及びターミナル

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JP2003501910A (ja) * 1999-05-26 2003-01-14 ノキア コーポレイション セルラーネットワークのターミナルにおいて信号電力レベルの測定を開始する方法及びターミナル

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"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2(Release 10)", 3GPP TS 36.300 V10.0.0, June 2010 (2010-06-01), pages 51 - 80 *

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