WO2005104598A1 - Procede de commande de transfert et dispositif a station mobile l’utilisant - Google Patents

Procede de commande de transfert et dispositif a station mobile l’utilisant Download PDF

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Publication number
WO2005104598A1
WO2005104598A1 PCT/JP2004/005534 JP2004005534W WO2005104598A1 WO 2005104598 A1 WO2005104598 A1 WO 2005104598A1 JP 2004005534 W JP2004005534 W JP 2004005534W WO 2005104598 A1 WO2005104598 A1 WO 2005104598A1
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WO
WIPO (PCT)
Prior art keywords
base station
handover
timing
reference frame
physical channel
Prior art date
Application number
PCT/JP2004/005534
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English (en)
Japanese (ja)
Inventor
Shigeki Yamaguchi
Yoshihiro Kubo
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2004/005534 priority Critical patent/WO2005104598A1/fr
Publication of WO2005104598A1 publication Critical patent/WO2005104598A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to a technique for controlling handover in a compressed mode of a W-CDM clear A (Wideband Code Division Multiple Access) mobile communication system.
  • W—CD MA Wideband Code Division Multiple Access
  • IMT-2000 International Mobile Telecommunications-2000
  • IMT-2000 International Mobile Telecommunications-2000
  • ITU - R International Telecommunications Union - Radio communication Sector
  • the service area is composed of a collection of small areas called cells that can communicate with base stations.
  • the reason why the mobile phone can talk over a wide range is because the mobile phone communicates while switching the base station that covers the cell.
  • there are roughly two types of switching processing of the base station with which communication is performed One is to maintain communication with the currently accessed base station while maintaining communication with the new base station. Is a soft handover that terminates the communication with the base station of the switching source. The other is a hard handover in which communication with the currently accessed base station is terminated and communication is switched to communication with the new base station.
  • the carrier frequencies of base stations that cover basically adjacent cells are the same, and communication channels of a plurality of subscribers are multiplexed using a spreading code. In this case, soft handover is possible when switching between base stations. However, when multiple carriers provide services, the carrier frequencies of the base stations that cover adjacent cells may differ, and hard handover processing is performed when switching between base stations.
  • W-CDM Wideband Code Division Multiple Access
  • the shortening of the hard handover processing time is disclosed, for example, in Japanese Patent Application Laid-Open Publication No. 2000-308081.
  • the wireless condition of the base station indicates communication control information including a communication frequency and a scrambling pattern that is a spreading code.
  • the mobile unit has two radio units that have a transceiver unit with the base station. At this time, one radio unit communicates with the base station of the handover source, and the other radio unit establishes synchronization of the communication channel with the base station of the handover destination. If communication with the handover destination base station can be established, communication with the handover source base station is terminated, so that handover without instantaneous interruption is possible.
  • the present invention has been made to solve the above-described problems, and the handover processing time during hard handover using the compressed mode of the W-CDM (Wideband Code Division Multiple Access) mobile communication system is considered.
  • An object of the present invention is to provide a short handover control method and a mobile station device using the same.
  • a handover control method is a base station in which the timing of a reference frame of a common channel transmitted by a mobile station based on different carrier frequencies in a compression mode of a W-CDMA (Wideband Code Division Multiple Access) mobile communication system is unknown.
  • the reference frame timing acquisition processing for acquiring the reference frame timing and the downlink physical channel synchronization establishment processing for establishing physical channel synchronization on the downlink are performed in parallel. is there.
  • a mobile station apparatus differs in a compression mode of a W-CDMA (Wideband Code Division Multiule Access) mobile communication system.
  • Communication control unit that establishes synchronization of physical channels in the downlink when the timing of each frame is known in order to hand over to the base station whose timing of the common channel reference frame transmitted based on the carrier frequency is unknown. It is provided with.
  • a mobile station hands over to a base station whose reference frame timing of a common channel transmitted based on different carrier frequencies is unknown. Therefore, the handover processing time is short because the reference frame timing acquisition processing for acquiring the reference frame timing and the downlink physical channel synchronization establishment processing for establishing the downlink physical channel synchronization are performed in parallel. A handover control method can be obtained.
  • W_CDMA Wideband Code Division Multiple Access
  • a base station in order to perform handover to a base station whose timing of a reference frame of a common channel transmitted based on different carrier frequencies in a compression mode of a W-CDMA (Wideband Code Division Multiple Access) mobile communication system is unknown. If the timing of each frame is known, a mobile station device having a short handover processing time can be obtained because the communication control unit that establishes synchronization of the physical channel in the downlink is provided.
  • W-CDMA Wideband Code Division Multiple Access
  • FIG. 1 is a block diagram showing an outline of handover according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram showing a configuration of a mobile station device according to Embodiment 1 of the present invention.
  • FIG. 3 is a diagram showing a communication control in the mobile station apparatus according to Embodiment 1 of the present invention.
  • 4 is a block diagram illustrating a configuration of a control unit.
  • FIG. 4 is a sequence diagram showing a series of operations of handover of related equipment including a mobile station device according to Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart showing main operations of handover of the mobile station device according to Embodiment 1 of the present invention.
  • FIG. 6 is a diagram showing instantaneous interruption times of communication channels of the mobile station apparatus according to Embodiment 1 of the present invention.
  • FIG. 1 is a block diagram showing an outline of a handover according to the first embodiment of the present invention.
  • the base station 10 communicates with a mobile phone which is a mobile station device in the cell 11.
  • the mobile phone in the cell 11 communicates with the base station 10 via a wireless communication channel.
  • the radio communication channel uses a carrier frequency of f ul for the uplink from the mobile phone to the base station 10 and a carrier frequency of f dl for the downlink from the base station 10 to the mobile phone.
  • the base station 20 performs wireless communication with a mobile phone in the cell 21.
  • the radio communication channel uses a carrier frequency of fu 2 for the uplink and f d 2 for the downlink.
  • the base stations 10 and 20 are connected to the radio network controller 30 connected to the core network 40 by wire.
  • the mobile phone 100 at position A in cell 11 is communicating with base station 10.
  • the mobile phone 100 moves to the position B.
  • position B is in the range where cells 11 and 21 overlap.
  • the mobile phone 100 that has moved to the position B becomes farther from the base station 10, and the reception level of the wireless communication channel transmitted from the base station 10 decreases.
  • the mobile phone 100 Notify the radio network controller 30 via the station 10 of the decrease in the reception level.
  • the radio network controller 30 selects the type of handover and the handover destination base station based on the notification information from the mobile phone 100 and the resource information of the base station covering the cells around the cell 11, and performs the base operation. Notify station 10.
  • the radio network controller 30 selects a hard handover using the compressed mode and the base station of the handover destination.
  • the base station 10 is notified together with the selection information of 20.
  • the base station 10 notifies the mobile phone 100 at the position B to disconnect the communication with the base station 10 and start the communication with the base station 20.
  • the mobile phone 100 performs a handover process for switching from the base station 10 to the base station 20 based on the information of the base station 20 designated from the wireless network control device 30 via the base station 1 ⁇ .
  • the mobile phone 100 After performing the handover process, the mobile phone 100 that has moved from the position B to the position C in the cell 21 communicates with the base station 20 using the wireless communication channel of the base station 20.
  • the setting information of the base station 20 specified via the base station 10 from the wireless network control device 30 includes the carrier frequency of the wireless communication channel of the base station 20 and the reception of data of the wireless communication channel. Includes timing, spreading code, etc.
  • FIG. 2 is a block diagram showing a configuration of the mobile station apparatus according to Embodiment 1 of the present invention.
  • Antenna 110 of mobile phone 100 receives a downlink radio signal transmitted by a W-CDMA (Wideband Code Division Multiple Access) method from a base station (not shown). The received signal to be received is output to the transceiver 120.
  • W-CDMA Wideband Code Division Multiple Access
  • the transceiver 120 includes a wideband band-pass filter (not shown) for extracting a frequency component in a predetermined band from the reception signal output from the antenna 110, and a carrier recovery circuit (for regenerating a carrier from the reception signal). And a receiver (not shown) for synchronously detecting the received signal using the carrier output from the carrier recovery circuit, and the received signal can be easily handled in the mobile phone 100. To convert to a signal with a frequency that is easy to handle.
  • the demodulated signal output by the receiving section is output to receiving path searching section 130 and receiving path extracting section 140.
  • Reception path search section 130 checks the reception timing of a radio signal reaching mobile phone 100 at various timings from the base station.
  • Radio waves transmitted from a base station include a direct wave that directly reaches the mobile phone 100 and a reflected wave that is reflected by a building or the like and arrives. Since some of these reflected waves reach the mobile phone 100 via a plurality of reception paths, the mobile phone 100 receives a radio signal from the base station at various times. Measure the delay port file of the common pilot channel (CPICH) included in the common channel transmitted from the base station, and determine the reception timing for various reception paths.
  • CPICH common pilot channel
  • the reception path extraction unit 140 includes an AZD conversion unit (not shown), a synchronous detection unit (not shown), a despread demodulation unit (not shown), and a RAKE combining unit ( Not shown).
  • the A / D converter converts the physical channels of the downlink including data symbols such as the common control physical channel (S_CCPCH: Secondary Common Control Physical Channel) and the dedicated physical channel (DPCH: Dedicated Physical Channel) into digital signals.
  • the signals that have been converted and code-demodulated by the synchronous detection unit and the despread demodulation unit are combined by a rake combining unit by correcting the time delay of the reception timing for each path, and output to the decoding unit 150.
  • the decoding unit 150 performs turbo / Viterbi decoding, dinterleaving, rate dematching, cyclic redundancy check (CRC) processing, and concealment processing, and generates transport channel data. Output to the mobile phone interface 170 and the communication control section 160.
  • CRC cyclic redundancy check
  • the communication control unit 160 controls the reception path search unit 130, the reception path extraction unit 140, the decoding unit 150, and the modulation / coding unit 190 described later. That is, communication control such as call termination control, data retransmission control, and transmission / reception power control is performed. The configuration of the communication control unit 160 will be described later.
  • the mobile phone interface 1700 performs display on the screen 181, which is a display of the mobile phone 100, controls input of the operation keys 182, and performs voice control for the microphone 18 3 ⁇ speaking power 1884. .
  • the decoding unit 190 performs transport redundancy data error correction code addition processing for cyclic redundancy check (CRC) processing, turbo Viterbi coding processing, interleaving processing, and rate matching processing. Then, the transport channel data is mapped to the physical channel data, modulated, and output to the transceiver 120.
  • the modulation is primary modulation, which is a narrowband modulation that modulates a carrier with physical channel data, and spread modulation is performed by switching a narrowband modulation signal with a spreading code to a wideband. Tuning secondary modulation.
  • the wideband modulated signal output from the modulation / encoding section 190 is output to the transceiver 120, and after being power-amplified, radiated from the antenna 110 into space.
  • the base station (not shown) receives radio waves radiated from the antenna 110 into the space, and performs communication between the base station and the mobile phone 100.
  • FIG. 3 is a block diagram showing a configuration of a communication control unit in the mobile station device according to Embodiment 1 of the present invention.
  • the reference control unit 160 obtains the reference frame timing.
  • the unit 1601 obtains the reference frame timing, which is the reception timing of the common channel broadcast from the base station, that is, obtains the reference frame system frame number (SFN). I do.
  • the system frame numbering means that the time of the pilot signal timing (pilot timing) provided at the beginning of the reference frame, which is the first frame of the common channel, is shifted from the reference time of the built-in clock of the mobile phone 100 by a frame. This is a number that indicates how many times the unit is late.
  • one frame is 10 milliseconds.
  • the downlink physical channel synchronization establishment processing section 162 performs downlink physical channel synchronization establishment processing when the timing in frame units is known. If the timing in frame units is known, the reference frame timing acquisition unit 161 and the downlink physical channel synchronization establishment processing unit 162 can perform each process independently.
  • the handover control section 16 3 controls handover processing.
  • the transmission power control section 164 performs transmission power control for the base station.
  • FIG. 4 is a sequence diagram showing a series of operations of handover of related equipment including the mobile station device according to Embodiment 1 of the present invention.
  • FIG. 5 shows main operations of handover of a mobile station device according to Embodiment 1 of the present invention. It is a flow chart.
  • FIG. 4 shows a mobile phone (MS: Mobile Station) 100, a base station (BS1: Base Station) 100, a base station (BS2) 20, and a radio network controller (RNC: Radio Network Controller).
  • equipment 30 indicates the operation and procedure between each equipment related to the handover process.
  • step S100 it is assumed that the mobile phone 100 is located in the cell 11, for example, at the position A in FIG. 1, and is communicating with the base station 10 using an individual channel.
  • step S110 the radio network controller 30 issues a request for starting the compressed mode to the base station 10.
  • the mobile phone 100 moves from position A to position B in FIG. 1, the distance of the mobile phone 100 from the base station 10 increases, and the reception level of the wireless communication channel transmitted from the base station 10 Decrease.
  • the mobile phone 100 notifies the wireless network control device 30 via the base station 10 of the reception level reduction.
  • the radio network controller 30 selects the type of handover and the handover destination base station based on the notification information from the mobile phone 100 and the resource information of the base station that covers cells around the cell 11.
  • the base station 10 is notified.
  • the base station 20 serving the cell 21 is selected.
  • the base station 20 uses a radio communication channel of a frequency different from that of the base station 10 and performs a hard handover process using the compression mode.
  • the radio network controller 30 issues a request for starting the compressed mode to the base station 10.
  • step S120 the base station 100 issues a compression mode start request to the mobile phone 100 based on the compression mode start request from the wireless network control device 30.
  • step S121 the mobile phone 100 receives a compression mode start request from the base station 10 as a handover command.
  • step S130 based on the request to start the compression mode from the wireless network control device 30 to the base station 10 and the request to start the compression mode from the base station 10 to the mobile phone 100, the base station The station 10 and the mobile phone 100 start the compression mode.
  • step S131 the mobile phone 100 determines whether or not the frame timing of the handover destination base station 20 is known.
  • Frame timing is frame-level timing, not reference frame timing. If the frame timing is known, it means that the frame level can be synchronized. Once the frame level is synchronized, the physical channel can be opened. However, if the timing of the reference frame is unknown, physical channel data cannot be mapped to transport channel data, and significant data communication cannot be performed. If the frame timing is unknown, go to step S140.
  • step S140 the timing of each frame of the common channel of the base station 20 as the handover destination is measured.
  • the timing of the pilot signal on the common pilot channel (CPICH) broadcast from the base station 20 is measured.
  • the handover control unit 163 sends a frame timing acquisition request of the handover destination base station 20 to the reception path search unit 130.
  • the reception path search unit 130 measures the timing of the pilot signal on the common pilot channel (CPICH) from the handover destination base station 20.
  • step S150 the common channel of the handover destination base station 20
  • the measurement result of frame timing 2 is reported to the base station 10 of the handover source.
  • step S160 the measurement result of the frame timing of the common channel of the base station 20 received from the mobile phone 100 is reported to the wireless network 30.
  • step S170 a communication setting request with the mobile phone 100 is issued to the handover destination base station 20.
  • This communication setting information includes the carrier frequency of the wireless communication channel of the base station 20, the reception timing of the data of the wireless communication channel, the spreading code, and the like.
  • step S180 based on the communication setting request from the wireless network control device 30, the handover destination base station 20 performs communication setting for the dedicated channel.
  • step S190 the wireless network control device 30 causes the handover source base station 10 to perform a handover in which the mobile phone device 100 in communication is handed over to the handover destination base station 20. Make a request.
  • step S200 based on the handover request from the wireless network control device 30, the base station 100 issues a request to the mobile phone 100 to perform a handover to the handover destination base station 20.
  • step S210 based on the handover request from base station 10, mobile phone 100 starts handover processing from base station 10 to base station 20. This is the handover execution timing.
  • the handover control unit 163 sends a request for switching from the handover source base station 10 to the data transmission / reception setting of the handover destination base station 20 to the transceiver 120.
  • the data transmission / reception setting includes information on the carrier frequency of the handover destination base station 20 and the scrambling code.
  • step S 211 handover from base station 10 to base station 20 As processing, the downlink physical channel is switched from base station 10 to base station 20.
  • step S212 the mobile phone 100 determines whether or not the timing of the basic frame of the base station 20 of the handover destination is known. That is, it is determined whether or not the timing acquisition of the reference frame has been completed.
  • the basic frame timing of the base station of the handover destination is unknown, and the process proceeds to step S220.
  • step S224 the basic frame timing of the handover destination base station is known, and the process proceeds to step S224 described later.
  • step S220 a process of acquiring a system frame number (SFN) representing the timing of the reference frame, a process of establishing physical channel synchronization on the downlink, and a process of the power control preamble section are performed in parallel.
  • SFN system frame number
  • step S22 a system frame number (SFN) representing the timing of the reference frame is obtained.
  • the handover control unit 163 instructs the reference frame timing acquisition unit 161 to acquire the reference frame system frame number (SFN). Since the timing of the frame unit is known in step S150, the reference frame timing acquisition unit 161 can perform the acquisition processing of the system frame number (SFN) of the reference frame.
  • step S222 synchronization of the downlink physical channel is established.
  • the handover control unit 163 instructs the downlink physical channel synchronization establishment processing unit 162 to perform the process of establishing the synchronization of the physical channel of the line. Since the timing of each frame is known in step S150, the downlink physical channel synchronization establishment processing section 162 can perform the processing of establishing the synchronization of the downlink physical channel.
  • step S223 preparation for transmission power control for base station 20 is performed.
  • the handover control unit 163 instructs the transmission power control unit 164 to perform transmission power control processing.
  • Step S2224 is the same as step S222.
  • Step S225 is the same as step S223.
  • step S226 processing is performed for a Signaling Radio Bearer Delay section.
  • the Signaling Radio Bearer Delay section is a section provided in consideration of communication control information transmission delay.
  • step S230 the mobile phone 100 that has completed the handover process communicates with the base station 20 using the dedicated channel.
  • FIG. 6 is a diagram showing instantaneous interruption times of communication channels of the mobile station device according to Embodiment 1 of the present invention.
  • (A) of Fig. 6 shows the down link
  • (b) of Fig. 6 shows the instantaneous interruption time of the communication channel of the up link.
  • b is called Dedicated Physical Control Channel (DPCCH) quality measurement time and is the time required for downlink synchronization establishment processing. It takes at least 40 milliseconds.
  • c is the timing acquisition time of the reference frame, which takes 30 to 40 ms.
  • d is the maximum TTI (Transmission Time Interval) delimitation waiting time, which is the time used to delimit data determined for each communication type (bearer). It takes 10 to 80 milliseconds.
  • TTI Transmission Time Interval
  • the time c can be reduced. Therefore, the time of a + b + d is the instantaneous interruption time of the downlink transport channel.
  • the time T4 corresponds to the time T1 at which the switching of the downlink physical channel in FIG. 6A is started, and the switching of the physical channel of the uplink starts at the same time as the switching of the physical channel of the downlink starts. It is assumed that the synchronization establishment processing of the uplink physical channel is completed at time T5.
  • e is the time required to establish downlink physical channel synchronization, and corresponds to the time a + b in (a) of Fig. 6.
  • f is the time required for power control preamble section processing.
  • e + f is the instantaneous interruption time of the uplink transport channel.
  • the handover control method and the mobile station device using the same according to the present invention are suitable for executing a hard handover using a compression mode of a W-CDMA (Wideband Code Division Multiple Access) mobile communication method.
  • W-CDMA Wideband Code Division Multiple Access

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

Abstract

Il est prévu un procédé de commande de transfert offrant un court temps de traitement de commutation de stations de base lors d’un transfert grâce à un mode de compression d’un procédé de communications mobiles W-CDMA (accès multiple par répartition en code à large bande) et un dispositif à station mobile utilisant le procédé. Pour le transfert à une station de base où le cadencement des trames de référence d’un canal commun transmis en fonction d’une fréquence porteuse de différents dispositifs à station mobile est inconnu, un traitement d’acquisition du cadencement de trames de référence pour acquérir le cadencement de trames de référence et un établissement de synchronisation de canal physique aval pour établir la synchronisation du canal physique dans la ligne aval sont effectués en parallèle. De plus, pour le transfert à une station de base où un cadencement de trames de référence du canal commun transmis en fonction d’une fréquence porteuse de différents dispositifs à station mobile est inconnu, il est prévu une section de commande de communications (160) pour établir la synchronisation du canal physique dans la ligne aval si le cadencement dans l’unité à trames est connu.
PCT/JP2004/005534 2004-04-19 2004-04-19 Procede de commande de transfert et dispositif a station mobile l’utilisant WO2005104598A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2004/005534 WO2005104598A1 (fr) 2004-04-19 2004-04-19 Procede de commande de transfert et dispositif a station mobile l’utilisant

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PCT/JP2004/005534 WO2005104598A1 (fr) 2004-04-19 2004-04-19 Procede de commande de transfert et dispositif a station mobile l’utilisant

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977393A1 (fr) * 1997-04-16 2000-02-02 Ntt Mobile Communications Network Inc. Procede de communication amdc
EP0981256A2 (fr) * 1998-08-19 2000-02-23 Fujitsu Limited Méthode de transfert cellulaire, station de base, station mobile et système de communication mobile
EP1401225A1 (fr) * 2002-09-20 2004-03-24 Nec Corporation Station mobile à AMRC avec une première et une deuxième partie réceptrice pour arrondir un décalage de chip temporel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977393A1 (fr) * 1997-04-16 2000-02-02 Ntt Mobile Communications Network Inc. Procede de communication amdc
EP0981256A2 (fr) * 1998-08-19 2000-02-23 Fujitsu Limited Méthode de transfert cellulaire, station de base, station mobile et système de communication mobile
EP1401225A1 (fr) * 2002-09-20 2004-03-24 Nec Corporation Station mobile à AMRC avec une première et une deuxième partie réceptrice pour arrondir un décalage de chip temporel

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