WO2015147510A1 - Dispositif et procédé de transfert intercellulaire dans un système de communication mobile - Google Patents

Dispositif et procédé de transfert intercellulaire dans un système de communication mobile Download PDF

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WO2015147510A1
WO2015147510A1 PCT/KR2015/002830 KR2015002830W WO2015147510A1 WO 2015147510 A1 WO2015147510 A1 WO 2015147510A1 KR 2015002830 W KR2015002830 W KR 2015002830W WO 2015147510 A1 WO2015147510 A1 WO 2015147510A1
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Prior art keywords
handover
state
threshold
terminal
cell
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PCT/KR2015/002830
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English (en)
Korean (ko)
Inventor
문정민
류선희
니감안슈만
이성진
정정수
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삼성전자 주식회사
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Priority claimed from KR1020140063888A external-priority patent/KR20150111254A/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Publication of WO2015147510A1 publication Critical patent/WO2015147510A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells

Definitions

  • the present invention relates to a method and apparatus for handover by adaptively applying a handover parameter according to a state of a terminal in a mobile communication system.
  • the handover is to change a serving base station from which a terminal is currently provided to a base station capable of providing a better quality of service. For example, if a service quality is deteriorated while receiving a service from a serving base station, the terminal hands over to a target base station capable of providing better quality of service, and continues to receive service from the target base station.
  • Heterogeneous networks include a macro base station communication area capable of transmitting and receiving service data with a macro base station (i.e., a macro cell), and a small base station communication area capable of transmitting and receiving service data with a small base station (ie, small).
  • FIG. 1 shows an example of a heterogeneous network including a macro cell and a small cell.
  • a heterogeneous network includes a plurality of macro cells, and each macro cell includes at least one small cell.
  • one macro cell includes one macro base station 105, 107, 109, 111 and at least one small base station 113, 117, 119, 121, 123, 125, 157 for transmitting and receiving service data with at least one terminal 101 and 103.
  • the small base station may be, for example, a micro base station, a pico base station, a femto base station, or the like.
  • the mobile terminals 101 and 103 perform a handover in order to maintain a quality of service for a service they receive.
  • the terminal (101,103) When the serving cell of the terminal (101,103) is a macro cell capable of transmitting and receiving service data with the macro base station 105, the terminal (101, 103) is a macro base station from the macro cell capable of transmitting and receiving service data with the macro base station 105 according to the moving position It is possible to handover to a macro cell capable of transmitting and receiving service data with the 107 or a small cell capable of transmitting and receiving service data with the small base station 117.
  • the serving cell of the terminals 101 and 103 is a small cell capable of transmitting and receiving service data with the small base station 117
  • Handover to the small cell or macro base station 107 capable of transmitting and receiving data and the macro cell capable of transmitting and receiving service data may be handed over.
  • a terminal may handover from a macro cell to a macro cell, a macro cell to a small cell, a small cell to a macro cell, or a small cell to a small cell.
  • a handover parameter it is necessary to apply a handover parameter by applying a handover parameter according to the state of the UE.
  • the present invention provides an apparatus and method for handover by adaptively applying a handover parameter according to a state of a terminal in a mobile communication system.
  • a handover apparatus of a terminal includes: a receiver configured to receive a cell-specific handover parameter from a base station; And measuring a signal-to-noise ratio (SINR) of a small cell, determining a state of the terminal according to the measured SINR using the received cell-specific handover parameter, and determining the state of the terminal according to the state of the terminal. And a control unit for performing a handover using one of the handover parameter sets set based on the cell-specific handover parameter.
  • SINR signal-to-noise ratio
  • a handover method of a terminal includes: receiving a cell-specific handover parameter from a base station; And measuring a signal-to-noise ratio (SINR) of a small cell, determining a state of the terminal according to the measured SINR using the received cell-specific handover parameter, and determining the state of the terminal according to the state of the terminal. And performing a handover using one of the handover parameter sets set based on the cell-specific handover parameter.
  • SINR signal-to-noise ratio
  • FIG. 1 is a diagram illustrating an example of a heterogeneous network including a macro cell and a small cell;
  • FIG. 2 is a diagram illustrating a handover result when a terminal performs a handover method based on relative signal quality
  • FIG. 3 is a diagram illustrating a handover result when a terminal performs an absolute signal quality based handover method
  • FIG. 5 is a diagram illustrating a general cell range extension method
  • FIG. 6 is a view illustrating a case where hand-in and hand-out to which an embodiment of the present invention is applied are generated;
  • FIG. 7 is a diagram illustrating a situation in which hysteresis is applied to an A2 / A4 event during handover;
  • FIG. 8 is a diagram illustrating a situation in which a threshold value of an A2 / A4 event is adjusted
  • FIG. 9 is a view showing a handover method according to the position of a terminal in an embodiment of the present invention.
  • FIG. 10 is a view showing the operation of a terminal and a base station according to an embodiment of the present invention.
  • 11 is a view showing a change in SINR with time when a hand-out occurs in a terminal
  • FIG. 12 is a view showing a handover device according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating an example of determining a state of a terminal in a first processing unit 1233 according to an embodiment of the present invention
  • FIG. 14 is a diagram illustrating a method of performing state switching according to an SINR of a small cell in the first processor 1233 according to an embodiment of the present invention
  • FIG. 15 is a diagram illustrating an example of performing state switching according to a movement of a terminal in a first processing unit 1233 according to an embodiment of the present invention
  • 16 is a diagram illustrating a method of applying a handover parameter set according to a state of a terminal in a second processing unit 1235 according to an embodiment of the present invention
  • 17 is a view illustrating switching of a handover parameter set according to a change in SINR according to an embodiment of the present invention
  • FIG. 18 is a diagram illustrating a handover method according to an embodiment of the present invention.
  • the main subject of the present invention is that a UE located in a small cell in a heterogeneous network performs handover by adaptively applying a handover parameter according to a current state.
  • a handover method in which a handover (hereinafter, referred to as a macro-to-small handover) in which a terminal connected to a macro cell moves to a small cell occurs in a heterogeneous network including a macro cell and a small cell.
  • a small cell that is, a target
  • SINR Signal to Interference Noise Ratio
  • a macro cell ie, a serving macro cell
  • SINR Signal to Interference Noise Ratio
  • the handover from the serving macro cell to the target small cell is compared.
  • this is defined as an A3 event (RSRP / RSRQ of target cell> RSRP / RSRQ of serving cell + offset).
  • SINR means average SINR.
  • the UE may perform handover to a cell having the best signal quality.
  • a macro cell provides a large area for service, and thus a base station has a large transmit power.
  • a small cell provides a service in a small area, and thus a base station has a small transmit power. Therefore, when comparing the SINR of the macro cell and the small cell, it is very likely that the SINR of the macro cell is better than the SINR of the small cell. Therefore, macro-to-small handover is unlikely to occur, which may cause congestion of macro cells and under-utilization of small cells. The rate at which this phenomenon occurs is shown in FIG. 2.
  • FIG. 2 shows a handover result when a terminal performs a handover method based on relative signal quality.
  • the time that the UE stays in the macro cell ie, macro cell time of stay ratio
  • the time that the UE stays in the small cell ie, small cell ToS
  • the UE may use an absolute signal quality based handover method.
  • the UE does not consider the SINR of the serving macro cell but considers only the SINR of the target small cell and handover to the target small cell when the SINR of the target small cell is higher than a specific threshold. In 3GPP LTE, this is defined as an A4 event (RSRP / RSRQ of target cell> threshold).
  • the UE performs a handover from the serving small cell to the target macro cell, if the SINR of the serving small cell is lower than a specific threshold value by considering only the SINR of the serving small cell without considering the SINR of the target macro cell, the UE moves to the target macro cell. Handover may be performed. In 3GPP LTE, this is defined as an A2 event (RSRP / RSRQ of serving cell ⁇ threshold).
  • the UE may enter or exit the small cell regardless of the signal quality of the macro cell. Therefore, by adjusting the threshold of the A2 / A4 event it is possible to control the time the terminal stays in the small cell.
  • the rate at which this phenomenon occurs is shown in FIG. 3.
  • 3 shows a handover result when the terminal performs an absolute signal quality based handover method.
  • the threshold value of the A2 / A4 event when the threshold value of the A2 / A4 event is high, the handover failure rate of the UE is low, and the small cell ToS is also short.
  • the threshold value of the A2 / A4 event is low, the probability of handover failure of the UE is high, and the small cell ToS is also long. This can be explained as follows.
  • the UE When the threshold of the A2 / A4 event is high, the UE enters the small cell when the signal quality of the small cell is very good and exits from the small cell when the signal quality of the small cell is very good. This can be accomplished by small cell hand-in (ie, macro-to-small handover) and hand-out (ie, small-to-macro handover) at a point close to the small cell base station. ) Is generated.
  • small cell hand-in ie, macro-to-small handover
  • hand-out ie, small-to-macro handover
  • the UE stays in the small cell for a short time, when the signal quality of the signal cell is very good, since the handover occurs to the small cell, it is highly likely to successfully receive the handover related information from the base station located in the small cell. Therefore, if the threshold of the A2 / A4 event is high, the probability of handover failure is low.
  • the UE enters the small cell when the signal quality of the small cell is poor and leaves the small cell when the signal quality of the small cell is bad. This means that hand-in and hand-out occur at a point far from the base station located in the small cell. Therefore, since the small cell handover occurs when the UE stays in the small cell for a long time but the signal quality of the small cell is not good, the possibility of successfully receiving the handover related information from the small cell BS is low. Therefore, when the threshold value of the A2 / A4 event is low, the probability of handover failure is high.
  • FIG. 4 illustrates a trade-off relationship between a handover failure probability and a small cell ToS in an A2 / A4 event.
  • the probability of handover failure is low, but the small cell ToS is also low, resulting in low utilization of the small cell.
  • the threshold of the A2 / A4 event is low (Low SINR threshold)
  • the small cell ToS is high but the probability of handover failure is high. Therefore, there is a need for a method for efficiently improving the trade-off relationship between the probability of handover failure and the small cell ToS. That is, there is a need for a method of increasing the small cell ToS while maintaining a constant handover failure probability or decreasing the handover failure probability while maintaining a constant small cell ToS.
  • the handover method using cell range extension is a concept included in the relative signal quality based handover method and the absolute signal quality based handover method described above.
  • 5 shows a general cell range extension method.
  • the offset of the A3 event or the threshold value of the A2 / A4 event is adjusted to the macro cell. This is to induce the located UE to perform handover to the small cell. Through this, it is possible to solve the low utilization of small cells generated in the relative signal quality based handover method and the absolute signal quality based handover method.
  • the handover related information from the base station located in the small cell is increased because the handover for the small cell occurs when the small cell ToS of the UE increases but the signal quality of the small cell is not good. Is unlikely to receive successfully. Therefore, the handover method using cell range extension has a high probability of handover failure.
  • the handover method based on the absolute signal quality based on the above-described handover method that is, when the SINR of the small cell is higher than a specific threshold value (ie, macro-to-small handover).
  • a specific threshold value ie, macro-to-small handover
  • hand-out i.e., small-to-macro handover
  • the trade-off relationship between the probability of handover failure and the small cell ToS Suggest ways to improve efficiently. That is, an embodiment of the present invention proposes a method of increasing the small cell ToS while maintaining a constant handover failure probability or decreasing the handover failure probability while maintaining a constant small cell ToS during handover.
  • the UE when the UE performs hand-in from the macro cell to the small cell when the SINR of the small cell is higher than the specific threshold, the small cell when the SINR of the small cell is lower than the specific threshold Perform a hand-out from the macro cell to the cell.
  • FIG. 6 illustrates a case where hand-in and hand-out to which an embodiment of the present invention is applied are generated.
  • the hand-in 605 occurs where the base station 630 of the small cell in the macro cell is located.
  • the terminal 601 since the terminal 601 performing the hand-in 605 is currently connected to the macro cell, the terminal 601 receives information necessary for performing handover from the base station 610 of the macro cell. Therefore, except when the small cell is located at the boundary of the macro cell, since the terminal 601 is provided with a good signal quality in the macro cell, it is highly likely to successfully receive information necessary for handover from the base station 610 of the macro cell. . This means that the terminal 601 does not have a high probability of handover failure when hand-in 605.
  • And hand-out 607 always occurs at the boundary of the small cell.
  • the terminal 603 performing the hand-out 607 since the terminal 603 performing the hand-out 607 is currently connected to the small cell, the terminal 603 receives the information necessary to perform the handover from the base station 630 of the small cell.
  • the signal quality between the base station 630 and the terminal 603 of the small cell is poor at the boundary of the small cell, it is difficult for the terminal 603 to successfully receive information necessary for handover from the base station 630 of the small cell. . This means that the terminal 603 has a high probability of handover failure when hand-out 607.
  • the probability of handover failure is not high when the hand-in occurs, whereas the probability of handover failure is high when the hand-out occurs.
  • the probability of handover failure must be mitigated as it causes service interruption for the user. Therefore, when a hand-out occurs, an improvement plan for reducing handover failure is needed.
  • a hand-in occurs, a method for increasing small cell use by increasing small cell ToS rather than a handover failure is needed. .
  • hysteresis is applied to prevent ping-pong handover.
  • handover occurs under the condition of Equation 1.
  • FIG. 7 illustrates a situation in which hysteresis is applied to an A2 / A4 event during handover.
  • the threshold applied to the hand-in 701 increases by the hysteresis value 730, the hand-in 701 is delayed and the small cell ToS is lowered.
  • the threshold applied to the hand-out 703 is lowered by the hysteresis value 730, the hand-out 703 is also delayed. This increases the small cell ToS but increases the probability of handover failure because the hand-out 703 occurs when the signal quality between the base station 750 and the terminal of the small cell becomes worse.
  • a margin equal to the value 730 of 2 ⁇ hysteresis exists between the hand-in 701 and the hand-out 703, the occurrence of the ping-pong handover can be prevented to a certain level.
  • FIG 8 illustrates a situation in which the threshold of the A2 / A4 event is adjusted.
  • the hand-in 801 is performed early to increase the small cell ToS during the hand-in 801, and when the signal quality between the terminal and the base station 810 of the small cell is good, the hand-out ( By performing the operation 803, it is possible to reduce the handover failure that occurs during the hand-out 803.
  • this threshold setting always results in ping-pong handover 850. That is, the terminal performs the hand-out 803 by satisfying the hand-out 803 condition as soon as the terminal performs the hand-in 801 and immediately hand-in 801 after performing the hand-out 803. ) Satisfies the condition and performs hand-in 801. Therefore, even in the case of handover, even though this ping-pong phenomenon is repeated, it is possible to increase the small cell ToS and reduce the handover failure, but this threshold setting is not applicable to the actual system.
  • an embodiment of the present invention proposes a method of increasing a small cell ToS when a hand-in occurs and preventing a ping-pong handover to a certain level while lowering the probability of handover failure when a hand-out occurs.
  • the embodiment of the present invention utilizes the experimental results as shown in FIG. 9 shows a handover method according to the position of the terminal in an embodiment of the present invention.
  • a terminal not yet adjacent to the small cell ie, a terminal in which the signal quality of the small cell is still poor
  • 901 does not consider hand-out and the small cell ToS Consider only hand-in to increase
  • the terminal 903 that receives a very high quality signal from the base station 907 located in the small cell does not consider hand-in and does not consider hand-in, and reduces hand-over failure probability. Only consider out.
  • the terminal 905 should consider both small cell hand-in and hand-out. Ping-Pong handover may occur in this area, and a method to prevent this should be applied.
  • FIG. 10 illustrates operations of a terminal and a base station according to an embodiment of the present invention.
  • the terminal 1001 receives a cell-specific handover parameter from a base station 1003 (1005).
  • the cell-specific handover parameter may include a state threshold 1, a state threshold 2, and a handover threshold 1 (or common threshold + cell-specific offset). 1)), the handover second threshold (HO threshold 2 (or common threshold + cell-specific offset 2)), the value of the first hysteresis (Hysteresis 1) and the value of the second hysteresis (Hysteresis 2), A detailed description of each parameter will be given later in the description of the handover apparatus according to the embodiment of the present invention.
  • the cell-specific handover parameter may have a different value for each cell.
  • FIG. 11 illustrates a change in SINR according to time when a hand-out occurs in a terminal.
  • SINR when hand-out occurs in a terminal, SINR is rapidly deteriorated 1101 according to time (or movement of the terminal) when interference is strong, whereas signal quality is improved according to time when interference is weak. It is slowly degraded 1103.
  • the base station 1003 broadcasts the cell-specific handover parameter (1005).
  • the terminal 1001 performs a handover by applying a handover parameter set according to a current state using the cell-specific handover parameter received from the base station 1003 (1007).
  • the method for the terminal 1001 to apply the handover parameter set according to the current state will be described in the description of the handover apparatus according to the embodiment of the present invention of FIG. 12.
  • the terminal 1001 may transmit a handover status report to the base station 1003 after performing the handover.
  • the handover status report may include information such as handover timing, SINR of handover related messages, and handover success / failure.
  • the base station 1003 may update the cell-specific parameter based on the received handover status report.
  • FIG. 12 illustrates a handover apparatus according to an embodiment of the present invention.
  • the handover apparatus includes a receiver 1210 and a controller 1230, and the controller 1230 includes a measurer 1231, a first processor 1233, and a second processor 1235. do.
  • the receiver 1210 receives a cell-specific handover parameter from a base station.
  • the cell-specific handover parameter may include a state threshold 1, a state threshold 2, and a handover threshold 1 (or common threshold + cell-specific). offset 1)), a handover second threshold (HO threshold 2 (or common threshold + cell-specific offset 2)), a value of first hysteresis (Hysteresis 1) and a value of second hysteresis (Hysteresis 2) .
  • the measuring unit 1231 measures the SINR of the small cell for a predetermined time.
  • the first processor 1233 measures the measured state using a state threshold 1 and a state threshold 2 among cell-specific handover parameters as shown in Equation 2 below.
  • the state of the terminal is determined according to the small cell SINR at a UE.
  • State 1 entry condition Small cell SINR at a UE ⁇ state threshold 1
  • State 2 entry condition Small cell SINR at a UE> state threshold 2
  • state threshold 1 is smaller than state threshold 2.
  • the terminal that satisfies the state 1 entry condition becomes state 1, and the terminal that satisfies the state 2 entry condition becomes state 2.
  • the terminal satisfying the State threshold 1 ⁇ Small cell SINR at a UE ⁇ State threshold 2 condition maintains its current state.
  • the first processor 1233 has an SINR of -8 dB. If it is lower, it is determined that the current state of the terminal is the first state (state 1). If it is higher than 3 dB of the SINR of the small cell, it is determined that the current state of the terminal is the second state (state 2).
  • the UE having an SINR between -8 dB and 3 dB is maintained without changing its state.
  • the first processor 1233 may perform a state transition according to the changed SINR of the small cell, as shown in FIGS. 14 and 15.
  • FIG. 14 illustrates a method of performing state switching according to the SINR of the small cell in the first processor 1233 according to an embodiment of the present invention
  • FIG. 15 is a diagram of a first processor 1233 according to an embodiment of the present invention. An example of performing a state switch in accordance with the movement of the terminal is shown.
  • the first processor 1233 may use the terminal using Equation 2 above. Re-determine the current state of.
  • an area near the small cell may be divided into three areas as follows.
  • Second region Region 2 always corresponding to state 2 (Small cell SINR> state threshold 2, region 1505 in FIG. 15)
  • the third region is a region that appears because state threshold 1 and state threshold 2 are different from each other and state threshold 1 ⁇
  • hand-in is performed to increase the ToS of the small cell
  • the hand-out is performed to reduce the probability of handover failure.
  • Being in zone 3 provides a way to prevent ping-pong handovers while maintaining the hand-in / hand-out conditions of the previous state.
  • the second processor 1235 applies different handover parameters according to the state of the terminal determined by the first processor 1233.
  • HO parameter set 1 HO threshold 1 and hysteresis 1
  • HO parameter set 2 HO threshold 2 and hysteresis 2
  • Equation 3 is a value set for increasing small cell ToS and is mainly used when a terminal located in a macro cell performs hand-in. That is, in Equation 3, the HO parameter set 1 is applied when the state of the terminal is state 1.
  • Equation 4 is set to reduce the probability of handover failure and is used when a terminal located in the center of the small cell performs hand-out. That is, in Equation 4, the HO parameter set 2 is applied when the state of the terminal is state 2.
  • Equation 5 the cell-specific handover parameters (HO threshold 1, hysteresis 1, HO threshold 2, and hysteresis 2) used in Equations 3 and 4 satisfy the relationship in Equation 5 below. Should be set to
  • Table 1 below shows an example in which the cell-specific handover parameter is set such that Equation 5 is satisfied.
  • the HO threshold 1 value in the HO parameter set 1 is set relatively low as -7 dB. This means that the UE performs hand-in early in a state where the signal quality of the small cell is relatively poor, thereby increasing the small cell ToS. In general, radio link failure (RLF) occurs at -8 dB. Therefore, if the HO threshold 1 value is set to -8 dB or more, even though the signal quality of the small cell is relatively poor, the time and frequency resources that are not used in the small cell can be used a lot, thereby improving the performance of the UE.
  • RLF radio link failure
  • the HO threshold 2 value was set relatively high as -2 dB. This means that the terminal performs hand-out early in a state where the signal quality of the small cell is relatively good and successfully receives information necessary for handover from the base station where the small cell is located. This lowers the probability of handover failure that occurs during hand-out.
  • the second processor 1235 performs handover using HO parameter set 1 or HO parameter set 2 of Equations 3 and 4 according to the state of the terminal. That is, the second processor 1235 performs handover using HO parameter set 1 when the current state of the terminal is state 1, and performs handover by using HO parameter set 2 when the current state of the terminal is state 2. To perform.
  • FIG. 16 illustrates a method of applying a handover parameter set according to a state of a terminal in a second processor 1235 according to an embodiment of the present invention. That is, the second processor 1235 performs handover using the following handover parameter set according to the state corresponding to each region in FIG. 16.
  • HO parameter set 1 (for example, Hand-in @ -6 dB, hand-out @ -8 dB)
  • Second area always corresponding to state 2 (Small cell SINR> state threshold 2, area 1605 in FIG. 16)
  • HO parameter set 2 (for example, Hand-in @ -1 dB, hand-out @ -3 dB)
  • the terminal 1500 performs a handover using the HO parameter set 1 in an area 1601 (that is, an area corresponding to state 1).
  • the handover is performed using the HO parameter set 2.
  • FIG. 17 illustrates switching of a handover parameter set according to a change in SINR according to an embodiment of the present invention. That is, when the change in SINR with time as the UE moves as shown in FIG. 17, the time when hand-in occurs (-6 dB) 1701 and the time when hand-out occurs (-3 dB) 1705 It is stated.
  • the receiving unit 1210 of the terminal receives a cell-specific handover parameter from the base station (1801).
  • the measurer 1231 measures the SINR of the small cell (1803).
  • the first processor 1233 determines the state of the terminal using state threshold 1 and state threshold 2 of the measured SINR and the cell-specific handover parameter according to Equation 2 (1805). If the determined state of the terminal is state 1, the second processor 1235 performs a handover using HO parameter set 1 according to Equation 3 (1807). In contrast, when the determined state of the terminal is state 2, the second processor 1235 performs a handover using HO parameter set 2 according to Equation 4 (1809).
  • the second processor 1235 continuously tracks the state change of the terminal 1811 and performs handover when necessary.
  • the SINR at the hand-in point cannot be lower than the SINR at the hand-out point. If the SINR at the hand-in point is lower than the SINR at the hand-out point, the ping-pong handover always occurs because the hand-out condition is satisfied immediately after the hand-in and the hand-in condition is satisfied immediately after the hand-out. .
  • the SINR at the hand-in time point may be set lower than the SINR at the hand-out time point. That is, in the handover method according to an embodiment of the present invention, since the state of the terminal is determined by state threshold 1 and state threshold 2 having a predetermined difference, the HO parameter set may be adaptively set according to the state of the terminal.
  • the handover method according to an embodiment of the present invention can effectively improve the trade-off relationship between small cell ToS and handover failure probability.

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Abstract

La présente invention concerne un procédé et un dispositif pour réaliser un transfert intercellulaire par application de manière adaptative d'un paramètre de transfert intercellulaire selon l'état d'un terminal dans un système de communication mobile. Selon la présente invention, un dispositif de transfert intercellulaire d'un terminal dans un système de communication mobile comprenant une petite cellule et une macro-cellule comprend : une unité de réception pour recevoir un paramètre de transfert intercellulaire spécifique à une cellule à partir d'une station de base; et une unité de commande pour mesurer un rapport signal sur brouillage plus bruit (SINR) de la petite cellule, déterminer l'état du terminal selon le SINR mesuré à l'aide du paramètre de transfert intercellulaire spécifique à une cellule reçu, et réaliser un transfert intercellulaire, selon l'état du terminal, à l'aide d'un ensemble de paramètres de transfert intercellulaire parmi des ensembles de paramètres de transfert intercellulaire configurés sur la base du paramètre de transfert intercellulaire spécifique à une cellule.
PCT/KR2015/002830 2014-03-25 2015-03-23 Dispositif et procédé de transfert intercellulaire dans un système de communication mobile WO2015147510A1 (fr)

Applications Claiming Priority (4)

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IN382KO2014 2014-03-25
IN382/KOL/2014 2014-03-25
KR1020140063888A KR20150111254A (ko) 2014-03-25 2014-05-27 이동 통신 시스템에서 핸드오버 장치 및 방법
KR10-2014-0063888 2014-05-27

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110067827A (ko) * 2009-12-15 2011-06-22 한국전자통신연구원 차세대 이동 통신 시스템에서의 핸드오버 처리 장치 및 방법
KR20120084533A (ko) * 2011-01-20 2012-07-30 삼성전자주식회사 이기종 망에서 핸드오버를 지원하기 위한 방법 및 장치
KR20130102076A (ko) * 2010-11-05 2013-09-16 알까뗄 루슨트 무선 네트워크 및 무선 네트워크를 위한 네트워크 요소에서 잠재적인 로드 밸런싱 동작을 결정하기 위한 방법
WO2013138225A1 (fr) * 2012-03-16 2013-09-19 Research In Motion Limited Réglage de paramètre de mobilité et estimation d'état de mobilité dans des réseaux hétérogènes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110067827A (ko) * 2009-12-15 2011-06-22 한국전자통신연구원 차세대 이동 통신 시스템에서의 핸드오버 처리 장치 및 방법
KR20130102076A (ko) * 2010-11-05 2013-09-16 알까뗄 루슨트 무선 네트워크 및 무선 네트워크를 위한 네트워크 요소에서 잠재적인 로드 밸런싱 동작을 결정하기 위한 방법
KR20120084533A (ko) * 2011-01-20 2012-07-30 삼성전자주식회사 이기종 망에서 핸드오버를 지원하기 위한 방법 및 장치
WO2013138225A1 (fr) * 2012-03-16 2013-09-19 Research In Motion Limited Réglage de paramètre de mobilité et estimation d'état de mobilité dans des réseaux hétérogènes

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