WO2014171724A1 - Procédé de transfert intercellulaire pour prendre en charge une communication d'un terminal mobile à grande vitesse et système d'antennes distribuées pour l'effectuer - Google Patents

Procédé de transfert intercellulaire pour prendre en charge une communication d'un terminal mobile à grande vitesse et système d'antennes distribuées pour l'effectuer Download PDF

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Publication number
WO2014171724A1
WO2014171724A1 PCT/KR2014/003290 KR2014003290W WO2014171724A1 WO 2014171724 A1 WO2014171724 A1 WO 2014171724A1 KR 2014003290 W KR2014003290 W KR 2014003290W WO 2014171724 A1 WO2014171724 A1 WO 2014171724A1
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WO
WIPO (PCT)
Prior art keywords
unit
mobile terminal
digital unit
radio
handover
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PCT/KR2014/003290
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English (en)
Korean (ko)
Inventor
김준형
최성우
김일규
Original Assignee
한국전자통신연구원
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Publication of WO2014171724A1 publication Critical patent/WO2014171724A1/fr

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    • 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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • 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
    • H04W36/0094—Definition of hand-off measurement parameters
    • 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
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a handover method for supporting communication of a high-speed mobile object in a network environment consisting of a distributed antenna system, and a distributed antenna system for performing the same.
  • a technique for a network based on a distributed antenna system-multiple input multiple output (DAS-MIMO) is receiving attention.
  • the DAS-MIMO-based network separates a component that performs digital processing and a component that performs radio processing among the functions of the existing base station, thereby managing a plurality of radio units (RUs) and digital units (DUs). Unit), and each radio unit includes a plurality of antennas to perform a MIMO function.
  • RUs radio units
  • DUs digital units
  • the digital unit is located between the core network and a plurality of radio units to perform functions such as encryption and decryption of the digital signal, and the radio unit transmits the digital signal received from the digital unit according to the frequency band.
  • the radio unit After converting into a Radio Frequency) signal performs a function of a remote antenna for transmitting and receiving the converted RF signal with the terminal through the antenna.
  • a radio unit generally includes a module for RF processing and an analog to digital (AD) and digital to analog (DA) conversion module, and the digital unit includes a modem of a modem and a protocol layer except for functions provided in the radio unit.
  • a module for processing the functions of the upper layer is provided.
  • the digital unit and the plurality of radio units are connected through an optical fiber to transmit and receive data.
  • the radio unit may be regarded as one base station in view of transmitting a signal directly to a communication device mounted on a user terminal or a mobile object.
  • most digital signal processing including modulation and demodulation of a signal is substantially performed in a digital unit. Therefore, the radio unit may be said to perform the function of a remote radio antenna (RRH) rather than a function of a general base station.
  • RRH remote radio antenna
  • handover may occur frequently as the mobile device (or mobile terminal) receiving the service features and the structural features of the network may have high service quality, and the quality of service may be reduced due to the delay time caused by frequent handover. There is a problem of deterioration.
  • a connection is lost between the base station and the communication device mounted on the high speed mobile object. When this happens, the service for all users in the fast moving object is interrupted.
  • An object of the present invention for solving the above problems is to perform a handover easily in a network environment based on a distributed antenna system, to reduce the delay time due to the handover, high-speed movement that can avoid inter-cell interference
  • the present invention provides a handover method for supporting communication of a terminal.
  • Another object of the present invention is to provide a distributed antenna system for executing the above handover method.
  • a handover method for supporting communication of a fast mobile terminal is a handover method performed in a first digital unit, a plurality of services for providing a mobile terminal Determining whether all of the serving radio units of the shared radio unit are shared by a plurality of digital units, and performing handover to the mobile terminal when the plurality of serving radio units are all shared radio units.
  • the shared radio unit may be configured as a radio unit shared by the first digital unit which provides a service to the mobile terminal and a second digital unit which is a handover target of the mobile terminal.
  • the performing of the handover for the mobile terminal may include transmitting a handover request message by the first digital unit and transmitting the data in response to the handover request message transmitted by the first digital unit. Receiving the interruption timing information and stopping the data transmission at the time indicated by the received data transmission interruption timing information by the first digital unit.
  • the handover method further includes the step of communicating with the mobile terminal through at least one radio unit of the plurality of serving radio units before performing the handover to the mobile terminal,
  • the radio unit that communicates with the mobile terminal is at least one shared radio unit
  • the mobile unit uses the fixed radio resource allocated in advance to the first digital unit among radio resources used by the at least one shared radio unit. Data can be transmitted to the terminal.
  • the handover method further comprises the step of communicating with the mobile terminal through at least one radio unit of the plurality of serving radio units before performing the handover to the mobile terminal, When the unit communicating with the mobile terminal is at least one shared radio unit, the radio resource used by the at least one shared radio unit is not a radio resource used by a second digital unit which is a handover target of the mobile terminal. Data may be transmitted to the mobile terminal using a radio resource.
  • a second radio resource for the handover between the first digital unit and the mobile terminal is determined by a radio resource to be used by the shared radio unit.
  • the method may further include dividing the digital units into fixed units.
  • a handover method for communication support of a fast mobile terminal for achieving the object of the present invention, receiving a handover request message from the serving digital unit of the mobile terminal, Determining a data transmission stop timing of the serving digital unit, a data transmission timing of a target digital unit to which the mobile terminal is to be handovered, and the determined data transmission stop timing information to the serving digital unit in response to a handover request message. And transmitting the determined data transmission timing information to the target digital unit.
  • the determining of the data transmission stop timing and the data transmission timing may include: moving speed information of the mobile terminal, and arrangement and transmission scheme of at least one shared radio unit shared by the serving digital unit and the target digital unit.
  • the data transmission stop timing and the data transmission timing may be determined in consideration of at least one piece of information.
  • the serving digital unit for providing a communication service to the mobile terminal, the serving digital unit is connected through a specific interface and the mobile terminal in accordance with the movement of the mobile terminal; And a plurality of radio units connected to each of the serving digital unit and the serving digital unit and the target digital unit through a specific medium, wherein the plurality of radio units comprise the serving digital unit and the target digital unit and the specific unit. And a plurality of shared radio units connected in common via a medium and shared by the digital unit and the target digital unit.
  • the serving digital unit may transmit a handover request message when all of the plurality of serving radio units communicating with the mobile terminal are changed to a shared radio unit.
  • the distributed antenna system determines the data transmission stop timing of the serving digital unit and the data transmission timing of the target digital unit according to the received handover request message.
  • the apparatus may further include a gateway configured to transmit the determined data transmission stop timing information to the serving digital unit and to transmit the data transmission timing information to the target digital unit.
  • the serving digital unit may stop data transmission being transmitted to the plurality of shared radio units at the time indicated by the received data transmission stop timing information.
  • the radio resources used by the plurality of shared radio units may be pre-divided and allocated according to the serving digital unit and the target digital unit.
  • the serving digital unit when the serving digital unit transmits and receives data using at least one shared radio unit among the plurality of shared radio units, the serving digital unit uses a radio resource allocated to the serving digital unit among radio resources used by the shared radio unit. And transmit and receive data, and when the target digital unit transmits and receives data using at least one shared radio unit among the plurality of shared radio units, the target digital unit is connected to the target digital unit among radio resources used by the shared radio unit. Data can be transmitted and received using the allocated radio resource.
  • a shared radio in which each digital unit shares and uses a plurality of radio units located in a cell boundary region of an adjacent digital unit The unit is configured to perform signal processing for communication with a high speed mobile terminal in one digital unit using a shared radio unit.
  • FIG. 1 is a conceptual diagram illustrating a configuration of a distributed antenna system for providing a communication service to a high speed mobile object.
  • FIG. 2 is a conceptual diagram illustrating interference occurring in a distributed antenna system based network environment.
  • FIG. 3 is a conceptual diagram illustrating a network environment to which a handover method for supporting communication of a fast mobile terminal according to an embodiment of the present invention is applied.
  • FIG. 4 is a flowchart illustrating a handover method for supporting communication of a fast mobile terminal according to an embodiment of the present invention.
  • FIG. 5 is a conceptual diagram illustrating a resource allocation method of a shared radio unit applied to a handover method according to an embodiment of the present invention.
  • a 'mobile terminal' may mean a user terminal moving at a high speed, or may mean a communication device mounted on a high speed moving body moving at a high speed such as a car, a bus, a train, a high speed train, and the like. It may mean a variety of means of transportation carried by the user carrying the communication terminal.
  • 1 is a distributed antenna system for providing a communication service to a fast moving object
  • a network based on a distributed antenna system may include a gateway 110, a plurality of digital units 120 and 130, and a plurality of radio units 141 to 146.
  • the gateway 110 may be connected to the plurality of digital units 120 and 130 through an optical cable, and transmit data transmitted from each digital unit 120 and 130 to the Internet, or data received from the Internet to the plurality of digital units. It transmits to the corresponding digital unit among the 120 and 130.
  • Each digital unit 120 and 130 may serve as a base station of a general mobile communication system, and manage a plurality of radio units 141 to 146 and mobile terminals connected to each radio unit.
  • the digital units 120 and 130 may be connected to each other through an X2 interface, and may be connected to the gateway 110 and an optical cable to access the Internet.
  • each of the digital units 120 and 130 may be connected to a plurality of radio units 141 to 143 or 144 to 146 managed by the digital unit 120 and 130 to transmit and receive user data and / or control signals.
  • the plurality of radio units 141 to 146 each perform a role of a remote antenna to transmit and receive signals to and from the mobile terminal 150 that moves at high speed.
  • the plurality of radio units 141 to 146 may be connected to the digital unit 120 or 130 that manages itself through an optical cable to transmit and receive data.
  • each radio unit 141 to 146 transmits data to the mobile terminal 150, it receives downlink data through an optical cable from the digital unit 120 or 130 managing itself, converts the data into an RF signal, and then downlinks the downlink.
  • each radio unit 141 to 146 When transmitting to the mobile terminal 150, and receiving a signal from the mobile terminal 150 through the uplink (uplink) through the optical cable to the corresponding digital unit (120 or 130) that manages the received signal Send it through.
  • each of the radio units 141 to 146 may include at least two antenna units that emit signals in different directions, and each antenna unit may be configured of a plurality of antennas to form a beam having a high directivity.
  • the mobile terminal 150 may also include a plurality of antennas for forming beams in different directions.
  • each radio unit 141 to 146 may be connected to a user terminal of a user who has boarded the high speed mobile body. Communication may be performed directly, and a communication device mounted on a high speed mobile object receives data transmitted from an arbitrary radio unit, and communicates with the wireless backhaul concept of transmitting the received data to each user terminal in the high speed mobile object. It can also be done.
  • the communication device mounted on the high speed mobile unit may be configured to convert data received from the radio unit into a Wi-Fi signal and transmit the data to a corresponding user in the high speed mobile unit.
  • a plurality of radio units 141 to 146 are installed at regular intervals along a track of a high speed train, and each radio unit 141 to 146 moves at high speed along a track.
  • handover occurs frequently according to the high-speed movement of the high-speed railway.
  • the service may be interrupted in all user terminals in the high speed train. Can be.
  • the handover delay time is reduced so that data transmission is not interrupted, thereby ensuring reliability of the radio link between the radio unit and the high speed mobile terminal. It should be possible.
  • FIG. 2 is a conceptual diagram illustrating interference occurring in a distributed antenna system based network environment.
  • a cell boundary formed by two adjacent digital units is illustrated.
  • the gateway 210, the first digital unit 220, and the second digital unit 230 are connected by an optical cable, and the first and second digital units 220 and 230 are connected through an X2 interface.
  • the first digital unit 220 and the first to third radio units 241 to 243 are connected by an optical cable so that the first digital unit 220 manages the first to third radio units 241 to 243, and the second Based on a distributed antenna system in which the digital unit 230 and the fourth to sixth radio units 244 to 246 are connected by optical cables so that the second digital unit 230 manages the fourth to sixth radio units 244 to 246.
  • the network environment is shown as an example.
  • the first to sixth radio units 241 to 246 each provide services in both directions of the road through beamforming, and a portion of the service area of each radio unit 241 to 246 is provided. It may be arranged to overlap each other to provide a service to all sections of the road.
  • the first digital unit 220 properly selects radio resources (for example, frequency, time, spatial resources, etc.) used by the first to third radio units 241 to 243 managed by the first digital unit 220. By assigning, it is possible to control the interference between the radio units 241 to 243, and the second digital unit 230 also appropriately allocates radio resources of the fourth to sixth radio units 244 to 246 which it manages. Interference between the fourth to sixth radio units 244 to 246 may be controlled.
  • radio resources for example, frequency, time, spatial resources, etc.
  • the cell boundary corresponds to a road section between the third radio unit 243 and the fourth radio unit 244.
  • a plurality of radio units 241 to 246 are installed around the highway, as shown in FIG. 2, a plurality of mobile terminals (for example, a user terminal or a user terminal carrying a user terminal in a cell boundary area). Since many passenger cars, buses, etc.) are distributed and can transmit and receive signals to and from the radio unit at the same time, the effect of interference has a very important effect on the quality of service and data transmission speed.
  • the first mobile terminal 251 when the first mobile terminal 251 is close to the third radio unit 243, the first mobile terminal 251 is the second radio unit 242 and the third radio unit 243.
  • a signal (Interference 2) transmitted from the fourth radio unit 243 may be received, in which case the signal transmitted from the fourth radio unit 244 acts as an interference signal.
  • the second mobile terminal 252 passes between the third radio unit 243 and the fourth radio unit 244, the second mobile terminal 252 is the third radio unit 243 and the fourth radio unit.
  • the signal transmitted from the second radio unit 242 (Interference 1) can also be received, in which case the signal transmitted from the second radio unit 242 acts as an interference signal. do.
  • the second radio unit 242 in FIG. 2 simultaneously from the third radio unit 243 belonging to the first digital unit 220 and the fourth radio unit 244 belonging to the second digital unit 230. Since the signal is received, the signal must be independently received from two different digital units (ie, the first and second digital units 220 and 230), so that the gateway 210 receives the first digital unit 220 and the first signal. Since the two digital units 230 need to process data to be transmitted, the processing load of the gateway 210 increases. In addition, when the third radio unit 243 and the fourth radio unit 244 transmit a signal to the second mobile terminal 252, the signal transmitted from each radio unit 243, 244 is the second mobile terminal ( Timing control, which controls the time to reach 252, is also complicated.
  • the second mobile terminal 252 transmits a signal through uplink, a technology such as soft combining cannot be applied because the signal received from one digital unit cannot be processed. There are disadvantages.
  • the first digital unit 220 is used. Since the corresponding retransmission data must be transmitted to the second digital unit 230 through the X2 interface, the load of the X2 interface is increased and the signal processing complexity of each digital unit 220 or 230 is increased.
  • a plurality of radios are located in a cell boundary region of each digital unit.
  • the unit is configured as a shared radio unit shared by each digital unit, thereby facilitating handover between digital units and minimizing delay time due to handover.
  • a shared radio unit to perform the signal processing for communication with the high-speed mobile terminal in one digital unit to reduce the processing load of the digital unit and the gateway, and to facilitate the retransmission technology in uplink communication Make it applicable.
  • the present invention by pre-allocating radio resources to be used when each digital unit transmits and receives a signal through a shared radio unit by dividing the digital units into digital units, interference between cells can be mitigated in the cell boundary region, and resource allocation information and retransmission are required. Data can be reduced to minimize the load and implementation complexity of the X2 interface.
  • FIG. 3 is a conceptual diagram illustrating a network environment to which a handover method for supporting communication of a fast mobile terminal according to an embodiment of the present invention is applied.
  • the gateway 310 and the plurality of digital units 320 and 330 are connected to each other through an optical cable and an X2 interface, and each of the digital units 320 and 330 is provided.
  • the gateway 310, the first digital unit 320, and the second digital unit 330 are connected through an optical cable, and the first and second digital units 320 and 330 are connected through an X2 interface.
  • the first digital unit 320 is connected to the first to fourth radio units 341 to 344 through an optical cable
  • the second digital unit 330 is connected to the third to sixth radio units 343 to 346 with an optical cable.
  • An example of a connected distributed antenna system based network environment is illustrated.
  • the third radio unit 343 and the fourth radio unit 344 are configured as a shared radio unit (S-RU) shared by the first digital unit 320 and the second digital unit 330 adjacent to each other.
  • the third radio unit 343 and the fourth radio unit 344 are also connected to the first and second digital units 320 and 330 through optical cables like other radio units.
  • the third radio unit 343 and the fourth radio unit 344 are configured as a shared radio unit (S-RU), but the shared radio unit shared by each digital unit is illustrated.
  • S-RU shared radio unit
  • the number of s is not limited to two, and the number of shared radio units may be changed according to the configuration or layout of the network or the actual channel environment.
  • handover between digital units will be described in more detail as a handover method for supporting communication of a fast mobile terminal according to an embodiment of the present invention.
  • the handover between radio units may be a known soft handover or hard handover method.
  • each radio unit may be configured to transmit a signal having high directivity in at least one specific direction through beamforming.
  • each of the radio units 341 to 346 transmits and receives a signal to and from the mobile terminal 350 using beams having strong directivity in both directions of the road.
  • the mobile terminal 350 when the mobile terminal 350 is located between the second radio unit 342 and the third radio unit 343 at time t1, the mobile terminal 350 has a magnitude of received signal strength at its location. Communicates with the second radio unit 342 and the third radio unit 343 that transmit the largest signal.
  • the received signal strength of the signal transmitted from each radio unit changes according to the position of the mobile terminal 350, and thus handover between radio units occurs.
  • the handover order of the radio units may vary according to transmission methods (for example, beamforming methods, etc.) used by each radio unit.
  • each of the radio units 341 to 346 transmits a signal having strong directivity in both directions of the road through beamforming, so that the mobile terminal 350 is connected to the third radio unit 343 at time t2.
  • the mobile terminal 350 When approaching, the mobile terminal 350 is located in a space corresponding to the side lobe of the beam radiated from the third radio unit 343 and the main lobe of the beam radiated from the fourth radio unit 344.
  • the received signal strength of the signal transmitted from the fourth radio unit 344 is greater than the signal transmitted from the third radio unit 343.
  • the mobile terminal 350 communicates with the second radio unit 342 and the fourth radio unit 344.
  • the mobile terminal 350 is located between the third radio unit 343 and the fourth radio unit 344 at time t3, the mobile terminal 350 is both composed of a shared radio unit (S-RU) Communication with the three radio units 343 and 344.
  • S-RU shared radio unit
  • start handover That is, in the example shown in FIG. 3, handover between the digital units 320 and 330 starts at time t3.
  • Handover between the digital units 320, 330 is first performed when the serving digital unit (ie, the first digital unit 320) recognizes that the mobile terminal 350 is all communicating with the shared radio units (S-RU). It begins with sending a handover request message to the gateway 310 via an optical cable.
  • the serving digital unit 320 may transmit a handover request message to the target digital unit 330 as well as the gateway 310.
  • the gateway 310 When the gateway 310 receives the handover request message from the serving digital unit 320, the gateway 310 correspondingly stops data transmission timing of the serving digital unit 320 and the target digital unit (ie, the second digital unit 330). The data transmission timing is determined, and the determined data transmission / stop timing information is transmitted to the serving digital unit 320 and the target digital unit 330 through an optical cable, respectively.
  • the gateway 310 may determine the data transmission stop timing and the data transmission timing in consideration of the speed of the mobile terminal 350, the deployment environment and / or transmission scheme of each radio unit including the shared radio unit.
  • the gateway 310 transmits a message requesting a handover to the second digital unit 320, and the gateway 310 responds to the handover request message received from the first digital unit 320 within a time t3 (ie, Before the time t4), the first digital unit 320 is notified of the data transmission stop time, and the second digital unit 330 is notified of the transmission start time. That is, the digital unit transmitting data to the mobile terminal 350 during the time t3 period is handed over from the first digital unit 320 to the second digital unit 330.
  • the shared radio unit is maintained as it is when performing handover from the first digital unit 320 to the second digital unit 330.
  • the serving digital unit 320 stops data transmission being transmitted to the mobile terminal 350 through the third and fourth radio units 343 and 344 based on the data interruption timing information received from the gateway 310,
  • the digital unit 330 starts data transmission to the mobile terminal 350 through the corresponding radio unit based on the data transmission timing information received from the gateway 310.
  • the target digital unit 330 may be configured to determine a radio unit to start data transmission according to the serving radio unit of the mobile terminal 350 and to start data transmission according to the data transmission timing for the determined radio unit.
  • the third radio unit 343 and the fourth radio unit 344 are configured as a shared radio unit (S-RU) to perform the handover between digital units only once at time t3.
  • the present invention performs handover between digital units 320 and 330 using a shared radio unit (S-RU)
  • the mobile terminal 350 may perform handover between digital units in addition to handover between radio units. You do not have to do anything.
  • the present invention applies a shared radio unit to a network environment based on a distributed antenna system to perform only one handover at a cell boundary point of an adjacent digital unit, thereby reducing processing complexity due to frequent handover. Service interruption due to handover delay can be prevented and signaling overhead required for handover can be reduced.
  • FIG. 4 is a flowchart illustrating a handover method for supporting communication of a fast mobile terminal according to an embodiment of the present invention.
  • FIG. 4 illustrates an example of a digital unit handover procedure performed in a network environment as shown in FIG. It is.
  • the first digital unit 420 is a serving digital unit (SDU) of the mobile terminal
  • the second digital unit 430 is a target digital unit (T-DU), which is a target digital unit for the mobile terminal to perform handover.
  • the first digital unit 420 determines whether the mobile terminal is connected only to shared radio units (S401).
  • the first digital unit 420 transmits a handover request message to the gateway 410 (S403).
  • the first digital unit 420 may transmit a handover request message to the gateway 410 through an optical cable.
  • the first digital unit 420 may simultaneously transmit a handover request message to the second digital unit 430 as well as the gateway 410.
  • the gateway 410 Upon receiving the handover request message from the first digital unit 420, the gateway 410 determines a transmission stop timing (or a data transmission stop point) of data that the first digital unit 420 is transmitting through the shared radio unit. In operation S405, the second digital unit 430 determines a transmission timing (or data transmission time) of data to be transmitted through the radio unit.
  • the gateway 410 transmits the determined data transmission stop timing information to the first digital unit 420 (S407), and transmits the data transmission timing to the second digital unit 430 (S409).
  • the first digital unit 420 receives the data transmission stop timing information transmitted by the gateway 410, and determines whether the data transmission stop point has arrived based on the received information (S411), and the data transmission stop point arrives. In one case, the transmission of the data being transmitted to the mobile terminal through the shared radio unit is stopped (S413).
  • the first digital unit 410 may transmit data to the mobile terminal through the shared radio unit until the data transmission stops, and in this case, the first digital unit 410 of all radio resources used by the shared radio unit. Data can be transmitted using radio resources pre-allocated for use. Alternatively, the first digital unit 410 may transmit data to the mobile terminal using radio resources not used by the second digital unit 430.
  • the second digital unit 430 receives data transmission timing information transmitted by the gateway 410, and determines whether the data transmission timing has arrived at the data transmission time point based on the received information (S415). If it is, the data transmission is started to the mobile terminal via the radio unit (S417).
  • the second digital unit 430 may determine a target radio unit to start data transmission based on the location of the mobile terminal or the serving radio unit information of the mobile terminal.
  • the target radio unit may be a shared radio unit or may be configured as a combination of a shared radio unit and a general radio unit other than the shared radio unit.
  • a radio resource allocated to data transmitted to a shared radio unit shared by two adjacent digital units in order to apply a shared radio unit Configure this so that it does not overlap.
  • digital units managing the shared radio unit use the method of sharing resource allocation information with each other by feeding back resource allocation information to the counterpart digital unit in real time through the X2 interface, A method may be used in which the digital unit collectively schedules resources to transmit data through the shared radio unit.
  • TTI transmission time interval
  • the present invention uses a method of allocating radio resources to be used by each shared radio unit in advance by digital unit.
  • the method of allocating resources to be used by the shared radio unit may be configured differently according to the network structure and the channel environment.
  • FIG. 5 is a conceptual diagram illustrating a resource allocation method of a shared radio unit applied to a handover method according to an embodiment of the present invention.
  • FIG. 5 shows that the gateway 510 and the first and second digital units 520 and 530 are connected through an optical cable, and the first and second digital units 520 and 530 are connected through an X2 interface, and the first digital The unit 520 is connected to the first to fourth radio units 541 to 544 by an optical cable, and the second digital unit 530 is connected to the third to sixth radio units 543 to 546 by an optical cable.
  • the three radio units 543 and the fourth radio unit 544 are configured as shared radio units (S-RUs) shared by the first and second digital units 520 and 530
  • the first to sixth radios An example of a resource allocation method of each of the units 541 to 546 illustrates a frequency allocation method.
  • the frequency allocation method illustrated in FIG. 5 may be performed before the handover method illustrated in FIG. 4 is performed, the frequency allocation may be performed by the gateway 510, or the first digital unit 520. ) And the second digital unit 530 may collaborate in advance and allocate the frequency domains to be overlapped with each other.
  • the third radio unit 543 and the fourth radio unit 544 which are shared radio units (S-RUs) shared by the first digital unit 520 and the second digital unit 530. ) Uses a method of avoiding inter-cell interference by allocating the frequency band to be used by each of the digital units 520 and 530 in advance.
  • Inter-cell interference managed by each of the digital units 520 and 530 may be avoided by mapping to and by mapping the right frequency band 572 to data transmitted from the second digital unit 530.
  • the second mobile terminal 552 when the second mobile terminal 552 performs the handover from the first digital unit 520 to the second digital unit 530, the second digital terminal 552 is the target digital unit. Since the first digital unit 520 is provided with the service before completing the handover to the unit 530, the third and fourth radio units 543 and 544 may be configured to include the first digital unit 520 in the entire frequency band. Communicate with the second mobile terminal 552 using the left frequency band 571 allocated for use.
  • the first mobile terminal 551 and the second mobile terminal 552 are both radio units 541 belonging to the first digital unit 520. 544 through 544, the first digital unit 520 properly allocates resources used by the radio units 541 to 544 belonging to the first digital unit 520 to belong to the first digital unit 520. Interference between signals transmitted from the signals 541 to 544 can be avoided.
  • the third and fourth radio units 543 and 544 are in the entire frequency band.
  • the second digital unit 530 communicates with the second mobile terminal 552 using the right frequency band 572 allocated for use.
  • the fourth radio unit 544 transmits from the fourth radio unit 544. Interference 2 does not act as interference on the signal transmitted by the third radio unit 543 to the first mobile terminal 551.
  • the second mobile terminal 552 performs the handover from the first digital unit 520 to the second digital unit 530
  • the first digital unit 520 is the second mobile terminal 552 is handed. Since the frequency band to be used by the third and fourth radio units 543 and 544 can be known in advance after the over is completed, the frequency used by the second radio unit 542 to transmit data to the first mobile terminal 551.
  • the signal transmitted from the second radio unit 542 by making the band use a frequency band not used by the second digital unit 530 among the frequency bands allocated to the third and fourth radio units 543 and 544 ( It is possible to prevent the interference 1) from interfering with the signals transmitted from the third and fourth radio units 543 and 544.
  • the frequency bands used by the shared radio unit are allocated in advance for each digital unit sharing the shared radio unit, thereby allocating resources between the digital units through the X2 interface. No feedback on the allocation information is needed, and intercell interference can be avoided.

Landscapes

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

Abstract

L'invention porte sur un procédé de transfert intercellulaire pour prendre en charge une communication d'un terminal mobile à grande vitesse, et sur un système d'antennes distribuées pour l'effectuer. Un procédé pour effectuer un transfert intercellulaire dans une première unité numérique du système d'antennes distribuées comprend : une étape consistant à déterminer si l'ensemble d'une pluralité d'unités radio de desserte pour fournir un service pour le terminal mobile est une unité radio partagée qui est partagée par une pluralité d'unités numériques ; et une étape consistant à effectuer un transfert intercellulaire pour le terminal mobile quand l'ensemble de la pluralité d'unités radio de desserte est l'unité radio partagée. Ainsi, le transfert intercellulaire pour l'unité mobile se déplaçant à grande vitesse peut être rapidement effectué et la qualité de service pour le terminal mobile à grande vitesse peut être assurée par réduction au minimum du retard dû au transfert intercellulaire.
PCT/KR2014/003290 2013-04-18 2014-04-16 Procédé de transfert intercellulaire pour prendre en charge une communication d'un terminal mobile à grande vitesse et système d'antennes distribuées pour l'effectuer WO2014171724A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0042594 2013-04-18
KR20130042594A KR20140125028A (ko) 2013-04-18 2013-04-18 고속 이동 단말의 통신 지원을 위한 핸드오버 방법 및 이를 수행하는 분산 안테나 시스템

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WO2014171724A1 true WO2014171724A1 (fr) 2014-10-23

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WO2018120462A1 (fr) * 2016-12-29 2018-07-05 华为技术有限公司 Procédé de commutation de groupe d'antennes et dispositif associé

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KR102313985B1 (ko) * 2016-11-23 2021-10-19 한국전자통신연구원 무선 유닛 선택 방법 및 프레임 설정 방법
US11271633B2 (en) * 2017-10-12 2022-03-08 Electronics And Telecommunications Research Institute Communication method and device for ultra-high-speed vehicle
KR102278610B1 (ko) * 2020-12-31 2021-07-16 주식회사 이엠따블유 차량용 무선 통신 시스템

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US20090075666A1 (en) * 2007-09-18 2009-03-19 Qualcomm Incorporated Signaling transmission on shared and dedicated channels in a wireless communication system
KR20090082115A (ko) * 2008-01-25 2009-07-29 엘지전자 주식회사 핸드오버 지연시간 감소 기법
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KR20100063555A (ko) * 2008-12-03 2010-06-11 고려대학교 산학협력단 중계기를 이용한 핸드오버 방법

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KR20090082115A (ko) * 2008-01-25 2009-07-29 엘지전자 주식회사 핸드오버 지연시간 감소 기법
KR20100003709A (ko) * 2008-07-01 2010-01-11 삼성전자주식회사 무선통신시스템의 핸드오버 장치 및 방법
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CN109314905A (zh) * 2016-12-29 2019-02-05 华为技术有限公司 一种天线组切换的方法及其相关设备
CN109314905B (zh) * 2016-12-29 2021-01-29 华为技术有限公司 一种天线组切换的方法及其相关设备

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