WO2009084083A1 - Dispositif passerelle et procédé de transfert de données - Google Patents

Dispositif passerelle et procédé de transfert de données Download PDF

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Publication number
WO2009084083A1
WO2009084083A1 PCT/JP2007/075107 JP2007075107W WO2009084083A1 WO 2009084083 A1 WO2009084083 A1 WO 2009084083A1 JP 2007075107 W JP2007075107 W JP 2007075107W WO 2009084083 A1 WO2009084083 A1 WO 2009084083A1
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WO
WIPO (PCT)
Prior art keywords
time
data packet
transmission
base station
radio base
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Application number
PCT/JP2007/075107
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English (en)
Japanese (ja)
Inventor
Chigusa Miyahara
Hidefumi Takaoka
Hideki Nagino
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Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2007/075107 priority Critical patent/WO2009084083A1/fr
Publication of WO2009084083A1 publication Critical patent/WO2009084083A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/28—Timers or timing mechanisms used in protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the present invention relates to a gateway device and a data transfer method for transferring a data packet sent from a core network toward a radio base station.
  • 3G 3rd generation
  • This 3G also has several stages of development.
  • mobile phones adopting a protocol called 3.5G or HSDPA with higher communication speed have also appeared.
  • a protocol called Super3G or 3.9G is being studied.
  • This Super3G system provides a service (MBMS; Multimedia Broadcast / Multimedia Service) that simultaneously distributes image data such as streaming broadcasts to a large number of mobile users.
  • MBMS Multimedia Broadcast / Multimedia Service
  • streaming broadcast data distributed by a core network streaming broadcast server is simultaneously distributed simultaneously to a plurality of wireless mobile station devices via a gateway device as multicast packet data.
  • a time stamp transmission start time
  • the gateway device has a function of calculating a time stamp and giving a time stamp value to the packet.
  • the radio base station apparatus that has received the multicast packet keeps the packet until the time of the time stamp, and transmits the packet to a large number of radio mobile station apparatuses at the time of the time stamp.
  • FIG. 1 is a schematic diagram of a communication system that performs MBMS.
  • a core network 10 a gateway device 20, a plurality of radio base station devices 30, and a radio mobile station device 40 such as a mobile phone are shown.
  • the core network 10 has the configuration shown in FIG. , Connected to a LAN (Local Area Network), a content server 11 for high-speed and large-capacity file transfer, a content server 12 for streaming transmission, a SIP server 13 for managing voice calls, and an NTP (Network Time Protocol for managing the current time) ) Server 14 is included.
  • the content servers 11 and 12 and the SIP server 13 transmit multicast packets (here, these multicast packets are collectively referred to as MBMS packets), and the MBMS packets are received by the gateway device 20 with a time stamp and wirelessly transmitted. It is transmitted to the base station device 30.
  • the radio base station device 30 transmits the MBMS packet to the radio mobile station device 40 at the same time when the time stamp is reached.
  • the gateway device 20 receives the NTP packet representing the current time from the NTP client 14 and corrects the time.
  • the radio base station apparatus 30 performs time correction by GPS (Global Positioning System).
  • FIG. 2 is a diagram illustrating a hardware configuration related to time adjustment of the gateway device 20.
  • the NTP server 14 manages an accurate current time, and an NTP packet representing the current time is input to the gateway device 20 via the LAN.
  • the gateway device 20 also manages the current time, but since the current time managed by the gateway device 20 has a large error, the current time is corrected based on the received NTP packet.
  • the gateway device 20 includes a CPU 21, a memory 22, a clock 23, and a LAN interface 24.
  • the memory 22 stores NTP client software.
  • the current time of the gateway device 20 is managed based on the clock generated by the clock 23.
  • the NTP client software is executed by the CPU 21, analyzes the NTP packet received by the LAN interface 24, and corrects the current time managed by the gateway device 20 based on the NTP packet.
  • FIG. 3 is a flowchart showing a time stamp calculation processing flow performed by the gateway device.
  • the reception time T (x) of the MBMS packet is acquired based on the current time managed by the gateway device 20 (step S11).
  • x of T (x) is the serial number of the MBMS packet received this time (denoted as MBMS packet (x)), and x-1 described later is the serial number of the MBMS packet (x-1) received last time. It is shown that.
  • L_time (x-1) represents the scheduled completion time of transmission of the previously received MBMS packet (x-1) from the radio base station device 30 to the radio mobile station device 40.
  • This scheduled transmission completion time is discretized in units of MTI representing the transmission cycle, which is obtained in step S15 described later when the flow of FIG. 3 is executed for the previously received MBMS packet (x ⁇ 1). It's time.
  • the transmission cycle MTI will be described later with reference to FIG.
  • Tdelay in the expression (1) is a radio frequency when the gateway device 20 transmits the MBMS packet to the radio base station device from the reception time of the MBMS packet and immediately prepares for transmission at the radio base station device.
  • the estimated time until the preparation for transmission in the base station apparatus is completed (this is called a delay time here) is shown.
  • step S12 the transmission time T (x) + Tdelay of the current MBMS packet is later than the scheduled transmission completion time when the transmission of the previous MBMS packet (x-1) at the radio base station apparatus is completed. It is determined whether (Yes) or not (No).
  • step S13 L_time (x-1) ⁇ T (x) + Tdelay Means that there is a time margin between the previous MBMS packet (x-1) and the current MBMS packet (x).
  • the radio base station apparatus should be notified this time
  • the MTI unit value immediately after the time of T (x) + Tdelay is obtained as TS (x) which is a time stamp indicating the transmission start time of the MBMS packet (x) from the radio base station apparatus (step S13). Details of step S13 will be described later.
  • step S14 it means that the previous MBMS packet (x ⁇ 1) and the current MBMS packet (x) have arrived at the gateway device successively.
  • the current MBMS to be notified to the radio base station device.
  • TS (x) which is a time stamp indicating the transmission start time of the packet (x) from the radio base station apparatus, is sent from the radio base station apparatus to the radio mobile station apparatus in the previous MBMS packet (x-1). Is scheduled to be transmitted (time stamp value L_Time (x ⁇ 1) discretized in MTI units. Details of step S14 will be described later.
  • step S15 the transmission completion time (time stamp value) L_Time (x) of the current MBMS packet (x) is obtained for calculation at the time of reception of the next MBMS packet (x + 1).
  • step S16 the current MBMS packet (X) is transmitted toward the radio base station apparatus with the time stamp value TS (x) obtained in step S13 or step S14.
  • FIG. 4 is step S12 of FIG. L_time (x-1) ⁇ T (x) + Tdelay It is a figure which shows the packet transmission / reception timing chart of the state which satisfies and progresses to step S13.
  • the horizontal axis represents the passage of time
  • the vertical line on the horizontal axis represents the passage of the time for each transmission cycle MTI.
  • MTI 10 msec (hereinafter, all units of msec are omitted).
  • MBMS packets are transmitted / received at the gateway device, transmitted / received at the wireless base station device, and received at the wireless mobile station device. Timing is shown.
  • FIG. 5 is a diagram showing a packet transmission / reception timing chart in a state in which the process proceeds to step S14 without satisfying the determination criterion in step S12.
  • the current packet (x) is sent to the gateway device following the previous packet (x-1). This is the case.
  • the radio base station apparatus transmits the previous packet (x ⁇ 1) at time 60 and the current packet (x) at time 70. To do.
  • the radio base station apparatus performs time correction by GPS, and always has an accurate time.
  • the gateway device obtains the time from the NTP server, and when the time correction frequency of the NTP server is low, or even if the correction frequency is high, the NTP server is discarded or stopped due to a high load or some trouble. When this occurs, the time managed by the gateway device may be shifted.
  • FIG. 6 is a diagram showing a packet transmission / reception timing chart when the time of the gateway device is ahead of the accurate time of the radio base station device.
  • the radio base station apparatus waits until the time 90 for the packet (x) and transmits the packet (x) to the radio base station apparatus, the residence time in the radio base station apparatus is increased by the advancement of the time of the gateway apparatus.
  • FIG. 7 is a diagram showing a packet transmission / reception timing chart when the time of the gateway device is corrected to an accurate time from the state where the time of the gateway device is advanced as shown in FIG.
  • step S12 since the criterion of the expression (1) in step S12 is not satisfied, the process proceeds to step S14, and the transmission start time TS (x) of the packet (x) is set as the previous packet (x ⁇ 1)
  • Cited Document 1 discloses a technique for detecting a congestion state of a network and changing a transmission rate, it does not solve the stagnation that accompanies a time lag of the wireless base station device.
  • Japanese Patent Laid-Open No. 11-112305 discloses a technique for detecting a congestion state of a network and changing a transmission rate, it does not solve the stagnation that accompanies a time lag of the wireless base station device.
  • the present invention has been made in view of the above circumstances, and aims to quickly eliminate the retention of packets caused by the advance of the gateway device time after the gateway device time is corrected to the correct time. To do.
  • the first gateway device of the gateway devices of the present invention that achieves the above object has been sent from a core network including a content server that is responsible for transmitting data packets and an NTP server that is responsible for transmitting NTP packets representing the current time.
  • a gateway device that receives a data packet, attaches a transmission start timestamp indicating the transmission start time of the data packet from the radio base station to the radio mobile station, and transmits the data packet to the radio base station.
  • a time management unit that manages the current time and receives the NTP packet to correct the current time; Based on the current time managed by the time management unit, a reception time acquisition unit that acquires the reception time of the data packet sent from the core network; Delay prediction until a data packet is transmitted to the radio base station at the reception time of the data packet acquired by the reception time acquisition unit, and the radio base station is ready to transmit the data packet to the radio mobile station
  • a transmittable time predicting unit that predicts a transmittable time of the data packet from the radio base station, and The first condition that the first data packet received this time from the core network is a time after the transmittable time predicted by the transmittable time prediction unit, and the first condition received last time from the core network and transmitted to the radio base station
  • a time stamp calculation unit for obtaining the transmission start time stamp that satisfies both of the second condition that the time is a time after the scheduled transmission completion time of the data packet of 2 from the radio base station to the radio mobile station;
  • the transmission completion schedule for the first data packet is added
  • a transmission completion time prediction unit for obtaining the time The time stamp calculation unit has a time later than the first reception time of the first data packet received this time from the core network and the second reception time of the second data packet previously received from the core network.
  • the transmission start time stamp is obtained based only on the first condition of the first condition and the second condition.
  • the first gateway device of the present invention is corrected from the time at which the gateway device time is advanced to an accurate time, and from the core network before the first reception time of the first data packet received this time from the core network.
  • the transmission start time is based on only the first condition among the first condition and the second condition. Since the stamp is obtained, the retention of the packet is quickly eliminated after the time of the gateway device is changed to an accurate time.
  • the second gateway device of the gateway devices of the present invention receives data packets sent from a core network including a content server responsible for transmitting data packets and an NTP server responsible for transmitting NTP packets representing the current time.
  • a gateway device that receives the data packet and transmits it to the radio base station with a transmission start time stamp indicating the transmission start time of the data packet from the radio base station to the radio mobile station;
  • a time management unit that manages the current time and receives the NTP packet to correct the current time;
  • a reception time acquisition unit that acquires the reception time of the data packet sent from the core network; Delay prediction until data packet is transmitted to the radio base station at the reception time of the data packet acquired by the reception time acquisition unit, and the radio base station is ready to transmit the data packet to the radio mobile station
  • a transmittable time predicting unit that predicts a transmittable time of the data packet from the radio base station, and The first condition that the first data packet received this time from the core network is a time
  • a transmission completion time prediction unit for obtaining a time;
  • the wireless base station A transmission for obtaining a new transmission start time of the second data packet from the station to the radio mobile station, and transmitting a correction notification packet instructing the radio base station to correct the new transmission start time A time correction unit,
  • the transmission completion time prediction unit performs a new transmission from the radio base station to the radio mobile station for the second data packet.
  • the transmission completion prediction time is obtained, and the time stamp calculation unit has a first condition that the time is a time after the transmission possible time predicted by the transmission possible time prediction unit of the first data packet received this time from the core network, Satisfy both of the second condition that the second data packet received last time from the core network and transmitted to the radio base station is a time after the predicted new transmission completion time from the radio base station to the radio mobile station.
  • the transmission start time stamp is obtained.
  • the previous time from the core network is earlier than the first reception time of the first data packet received this time from the core network, which is corrected to the accurate time from the time when the time of the gateway device has advanced.
  • the second reception time of the received second data packet is later, not only the packet after the time correction but also the packet sent to the radio base station before the time correction Also, the transmission start time is corrected, and packet retention is eliminated more quickly.
  • a first data transfer method of the data transfer method of the present invention that achieves the above object is a core server including a content server responsible for data packet transmission and an NTP server responsible for transmission of an NTP packet representing the current time.
  • the received data packet is received, and the data packet is transmitted to the radio base station with a transmission start time stamp indicating the transmission start time of the data packet from the radio base station to the radio mobile station.
  • a data transfer method comprising: A time management step for managing the current time and receiving the NTP packet to correct the current time; A reception time acquisition step of acquiring the reception time of the data packet sent from the core network based on the current time managed by the execution of the time management step; Delay prediction until a data packet is transmitted to a radio base station at the reception time of the reception time acquisition step and the radio base station is ready to transmit the data packet to the radio mobile station A transmission time predicting step for predicting a transmission time of the data packet from the radio base station by adding time; and The first condition that the first data packet received this time from the core network is a time after the transmittable time predicted in the transmittable time prediction step, and the first condition received last time from the core network and transmitted to the radio base station A time stamp calculation step for obtaining the transmission start time stamp satisfying both of the second condition that the time is a time after the scheduled transmission completion time of the data packet of 2 from the wireless base station to the wireless mobile station; By adding the estimated transmission time required for data packet transmission at the radio base station to the transmission start
  • a transmission completion time prediction step for obtaining a time In the time stamp calculating step, the second reception time of the second data packet previously received from the core network is later than the first reception time of the first data packet received this time from the core network.
  • the transmission start time stamp is obtained based on only the first condition out of the first condition and the second condition.
  • a second data transfer method of the data transfer method of the present invention that achieves the above object is provided from a core network including a content server responsible for data packet transmission and an NTP server responsible for transmission of an NTP packet representing the current time.
  • the received data packet is received, and the data packet is transmitted to the radio base station with a transmission start time stamp indicating the transmission start time of the data packet from the radio base station to the radio mobile station.
  • a data transfer method comprising: A time management step for managing the current time and receiving the NTP packet to correct the current time; A reception time acquisition step of acquiring the reception time of the data packet sent from the core network based on the current time managed by the execution of the time management step; Delay prediction until a data packet is transmitted to a radio base station at the reception time of the reception time acquisition step and the radio base station is ready to transmit the data packet to the radio mobile station A transmission time predicting step for predicting a transmission time of the data packet from the radio base station by adding time; and The first condition that the first data packet received this time from the core network is a time after the transmittable time predicted in the transmittable time prediction step, and the first condition received last time from the core network and transmitted to the radio base station A time stamp calculation step for obtaining the transmission start time stamp satisfying both of the second condition that the time is a time after the scheduled transmission completion time of the data packet of 2 from the wireless base station to the wireless mobile station; By adding the estimated transmission time required for data packet transmission at the radio base station to the transmission start
  • a transmission completion time prediction step for obtaining a time When the second reception time of the second data packet previously received from the core network is later than the first reception time of the first data packet received this time from the core network, the wireless base station A transmission for obtaining a new transmission start time of the second data packet from the station to the radio mobile station, and transmitting a correction notification packet instructing the radio base station to correct the new transmission start time A time correction step, In response to the fact that a new transmission start time of the second data packet has been obtained in the transmission time correction step, the transmission completion time prediction step performs a new transmission from the radio base station to the radio mobile station for the second data packet.
  • the transmission completion prediction time is obtained, and the time stamp calculation step includes a first condition that the time is a time after the transmission available time predicted by the transmission available time prediction unit of the first data packet received this time from the core network, Satisfy both of the second condition that the second data packet received last time from the core network and transmitted to the radio base station is a time after the predicted new transmission completion time from the radio base station to the radio mobile station. And a step of obtaining a transmission start time stamp.
  • FIG. 4 is a diagram illustrating a packet transmission / reception timing chart in a state in which L_time (x ⁇ 1) ⁇ T (x) + Tdelay is satisfied in step S12 of FIG. 3 and the process proceeds to step S13. It is a figure which shows the packet transmission / reception timing chart of the state which progresses to step S14, without satisfy
  • FIG. 8 is a diagram showing a time stamp calculation processing flow executed in the gateway device of the first embodiment of the present invention.
  • steps denoted by the same reference numerals as those in steps S10 to S16 in the flow shown in FIG. 3 are the same as those in the flow shown in FIG. 3.
  • steps S21 to S23 are performed. Has been added.
  • step S21 since T (x) ⁇ T (x-1), the reception time T (x) of the current packet (x) is greater than the reception time T (x-1) of the previous packet (x-1). It is determined whether it is time to return. When the reception time has not returned (No), step S22 is skipped and the process proceeds to step S23, and T (x) is set for the determination process in step S21 when the next packet (x + 1) is received. Saved to T (x-1), the process proceeds to step S12.
  • step S13 the transmission completion time of the previous packet (x-1) is ignored, and a value (MTI unit value) obtained by adding the delay time Tdelay to the reception time T (x) of the current packet (x) is obtained.
  • FIG. 9 is a diagram showing a packet transmission / reception timing chart in this case.
  • the transmission order of the packet (x) and the packet (x ⁇ 1) from the radio base station apparatus to the radio mobile station apparatus is reversed, but the radio mobile station apparatus uses the sequence number of the received packet. It is an interface that performs sequence control, and there is no problem.
  • FIG. 10 is a diagram showing a packet transmission / reception timing chart when a large number of packets are transmitted / received in the first embodiment.
  • packets (x-2) and (x-1) are received before time correction, and packets (x), (x + 1), (x + 2),..., (N) are received after time correction. Indicates the state.
  • the transmission start time stamps of the packets (x), (x + 1),..., (N) received after the time correction are reversed from the transmission start time stamps of the received packets before the time correction, as shown in FIG.
  • order control is performed in the radio mobile station apparatus, and information is transmitted to the user of the radio mobile station apparatus in the correct order.
  • FIG. 11 is a diagram showing a time stamp calculation processing flow executed in the gateway device according to the second embodiment of the present invention.
  • steps S10 to S16 in the flow shown in FIG. 3 are the same as the steps in the flow shown in FIG.
  • steps S31 to S35 are added compared to the flow shown in FIG.
  • step S31 as in step S21 of FIG. 8, it is determined whether or not the reception time has returned by T (x) ⁇ T (x ⁇ 1). If the reception time has not returned, steps S32 and S33 are performed. Skip to step S34.
  • step S34 as in step S23 of FIG. 8, T (x) is saved to T (x-1) for the determination process in step S31 when the next packet (x + 1) is received, and in step S12. move on.
  • step S31 when it is determined in step S31 that the reception time has returned, the process proceeds to step S32, and in this step S32, TS (x-1)> T (x) + Tdelay (2) Is satisfied.
  • TS (x ⁇ 1) in equation (2) is the previous packet (x ⁇ 1) calculated before time correction saved in step S35 when the previous packet (x ⁇ 1) was received.
  • T (x) + Tdelay is obtained by adding the delay time Tdelay to the reception time after the time correction of the packet (x).
  • the transmission start time of the previous packet (x ⁇ 1) is later than the transmission start possible time (T (x) + Tdelay) from the radio base station apparatus to the radio mobile station apparatus. It is determined whether or not.
  • step S33 is skipped and step S34 is skipped. move on.
  • step S32 If it is determined in step S32 that the expression (2) is satisfied, the process proceeds to step S33.
  • step S33 the transmission start time stamp TS (x-1) of the previous packet (x-1) is recalculated to the shortest time that the radio base station apparatus can transmit, taking into account the corrected current time, Along with this, the transmission completion time L_time (x-1) of the packet (x-1) is also recalculated, and the transmission start time stamp of the packet (x-1) is recalculated this time toward the radio base station apparatus.
  • a modification notification packet instructing modification to the transmitted transmission start time stamp TS (x ⁇ 1) is transmitted.
  • step S33 When the recalculation is performed in step S33, the value after the recalculation in step S33 is adopted as the transmission completion time L_time (x-1) of the previous packet (x-1) in steps S12 and S14.
  • step S35 the transmission start time stamp TS (x) of the current packet (x) obtained in step S13 or step S14 is set to TS (for the processing in steps S32 and S33 when the next packet (x + 1) is received. Saved as x-1).
  • FIG. 12 is a diagram showing a packet transmission / reception timing chart in the second embodiment shown in FIG.
  • the transmission start time stamp TS (x ⁇ 1) is recalculated for the previous packet (x ⁇ 1) and notified to the radio base station apparatus, and the radio base station apparatus receives the notification and receives the previous packet (x ⁇ 1).
  • the transmission start time stamp TS (x-1) of the previous packet (x-1) is recalculated to a value that does not stay in the radio base station apparatus as described above. And notified to the radio base station apparatus. Since the transmission start time stamp TS (x) of the current packet (x) is also calculated using the transmission completion scheduled time L_time (x-1) after the recalculation of the previous packet (x-1), A value that does not stay in the base station apparatus is set. As described above, in the case of the second embodiment, the problem of packet retention is solved without causing reversal of the transmission order of packets from the radio base station apparatus to the radio mobile station apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un dispositif passerelle et un dispositif de transfert de données permettant de transférer un paquet, transmis par un réseau principal, à une station de base radio. La résidence du paquet en raison de l'avance temporelle du dispositif passerelle est dissoute rapidement après que le temps du dispositif passerelle a été corrigé en fonction du temps correct. Si la seconde heure de réception d'un second paquet de données reçu la dernière fois en provenance du réseau principal est plus tardive que la première heure de réception d'un premier paquet de données reçu cette fois-ci en provenance du réseau principal, le temps de transmission du second paquet est ignoré et le temps de transmission du premier paquet est calculé.
PCT/JP2007/075107 2007-12-27 2007-12-27 Dispositif passerelle et procédé de transfert de données WO2009084083A1 (fr)

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PCT/JP2007/075107 WO2009084083A1 (fr) 2007-12-27 2007-12-27 Dispositif passerelle et procédé de transfert de données

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PCT/JP2007/075107 WO2009084083A1 (fr) 2007-12-27 2007-12-27 Dispositif passerelle et procédé de transfert de données

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101895552A (zh) * 2010-07-22 2010-11-24 北京天融信科技有限公司 一种安全网关及其检测代理上网的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000308109A (ja) * 1999-04-16 2000-11-02 Matsushita Electric Ind Co Ltd 移動交換網における信号処理装置及び方法
WO2006027969A1 (fr) * 2004-09-09 2006-03-16 Matsushita Electric Industrial Co., Ltd. Appareil d’émission, appareil relais, appareil de réception et système de réseau incluant ces appareils
WO2006082628A1 (fr) * 2005-02-01 2006-08-10 Mitsubishi Denki Kabushiki Kaisha Système de synchronisation inter-station de base, dispositif de commande de synchronisation et station de base
JP2007166278A (ja) * 2005-12-14 2007-06-28 Nippon Telegr & Teleph Corp <Ntt> 無線通信システムおよび無線通信方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000308109A (ja) * 1999-04-16 2000-11-02 Matsushita Electric Ind Co Ltd 移動交換網における信号処理装置及び方法
WO2006027969A1 (fr) * 2004-09-09 2006-03-16 Matsushita Electric Industrial Co., Ltd. Appareil d’émission, appareil relais, appareil de réception et système de réseau incluant ces appareils
WO2006082628A1 (fr) * 2005-02-01 2006-08-10 Mitsubishi Denki Kabushiki Kaisha Système de synchronisation inter-station de base, dispositif de commande de synchronisation et station de base
JP2007166278A (ja) * 2005-12-14 2007-06-28 Nippon Telegr & Teleph Corp <Ntt> 無線通信システムおよび無線通信方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101895552A (zh) * 2010-07-22 2010-11-24 北京天融信科技有限公司 一种安全网关及其检测代理上网的方法
CN101895552B (zh) * 2010-07-22 2014-01-01 北京天融信科技有限公司 一种安全网关及其检测代理上网的方法

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