WO2007001134A1 - Adaptive gps tdd repeater and method - Google Patents

Adaptive gps tdd repeater and method Download PDF

Info

Publication number
WO2007001134A1
WO2007001134A1 PCT/KR2006/002419 KR2006002419W WO2007001134A1 WO 2007001134 A1 WO2007001134 A1 WO 2007001134A1 KR 2006002419 W KR2006002419 W KR 2006002419W WO 2007001134 A1 WO2007001134 A1 WO 2007001134A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
tdd
repeater
base station
gps
Prior art date
Application number
PCT/KR2006/002419
Other languages
French (fr)
Inventor
Sidong Lee
Original Assignee
Sidong Lee
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 Sidong Lee filed Critical Sidong Lee
Publication of WO2007001134A1 publication Critical patent/WO2007001134A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]

Definitions

  • the present invention relates to a repeater and the method that enable the provision of good-quality calls to terminal users by amplifying weak radio signals between a base station and terminals, and, more specifically, a relaying method and the repeater that the up link and down link switching synchronization with the base station and terminals in a repeater of the TDD (Time Division Duplexing) system, by detecting the timing signal of the GPS and the power change of the downlink subframe signal level transmitted from the base station, generate a switching signal from these.
  • TDD Time Division Duplexing
  • the time length of a frame is 5mS
  • a frame is arranged in the order of and composed of a downlink subframe, TTG (Tx/Rx Transition Gap), a uplink subframe, and RTG (Rx/Tx Transition Group), and the ratio of the downlink subframe and uplink subframe within a frame varies adaptively according to the number of users and the amount of data to be transmitted.
  • the repeater of the TDD system must synchronize switching with the base station and terminal by generating a signal used in the up link and down link switching synchronization for relaying the base station signal and the terminal signal.
  • Another proposed repeater system synchronizing at the same time as the base station using the time signal of GPS can have a problem due to the error of a switching synchronization occurring by the propagation delay time of radio signal because of the propagation distance between the base station and a repeater.
  • the ratio of a downlink subframe and an uplink subframe changes adaptively according to the usage ratio of the uplink and downlink, and thus there has been a problem which cannot adaptively generate a switching signal at a repeater matching to this TDD signal.
  • the system solve a problem that cannot differentiate a downlink subframe signal from the base station and an uplink subframe signal from a terminal, which can occur when generating a switching signal only by a receiving radio signal power level receiving at the repeater, and another problem that it is difficult to generate a switching signal in case the strength of a receiving signal is low power level;
  • the repeater After detecting the RF (Radio Frequency) signal power level of a downlink subframe signal to be relayed and thus locating the ending point of a downlink subframe where the power level is starting to decrease rapidly, and generating an uplink switching signal for relaying an uplink subframe and then keeping until the next downlink switching signal, the repeater adaptively generates a switching signal according to the ratio of the downlink subframe and uplink subframe, which could not be embodied in the switching plan using only the GPS signal.
  • RF Radio Frequency
  • the repeater solves the problem that can occur owing to the propagation delay by providing as a timing reference signal for switching synchronization through delaying from the timing signal of GPS signal by as much as the propagation delay time of the base station signal at the timing signal of GPS signal which is a timing reference signal for the switching synchronization at the repeater by calculating the propagation delay time of a downlink subframe transmitted from the base station of the base station-repeater propagation through entering the base station- repeater distance with the preparation of a unit like a distance enterer at the repeater after measuring the distance between the base station and the repeater. And makes more accurate switching possible by applying after adding or subtracting various signal processing times taking place in the repeater from the propagation time of the base station signal;
  • the present invention can reduce mutual interference within the repeater by alternation of on and off through the control of RF modules consisting of active devices such as LNA (Low Noise Amplifier) and active mixer, which are downlink processing devices within the repeater for relaying downlink subframe signals, and the control of the active RF devices used as uplink processing devices for relaying uplink subframe signals;
  • active devices such as LNA (Low Noise Amplifier) and active mixer
  • a single antenna structure can transmit/receive the base station signals and receive the GPS signal
  • the repeater acquires a timing signal from GPS signal, and setting this timing signal as the timing reference signal for relaying a downlink subframe transmitted from the base station;
  • the repeater from the reference time for relaying the uplink subframe, relay the uplink subframe by generating a switching signal relaying the uplink subframe of the TDD signal frame,
  • the portable Internet system of the TDD method operates by synchronizing the transmitting time of a frame with the GPS signal at the base station as a reference.
  • a frame of the TDD signal is arranged in the order of and composed of a downlink subframe transmitted to the terminal direction by generating with the timing signal of GPS signal at the base station as a reference, TTG (Tx/Rx Transition Gap) where data transmission is not made, an uplink subframe transmitted from a terminal to the base station, and RTG (Rx/Tx Transition Gap), and the time length per frame of this TDD signal is 5mS.
  • TTG Tx/Rx Transition Gap
  • RTG Rx/Tx Transition Gap
  • the time length per frame of this TDD signal is 5mS.
  • the name of the frame elements such as TTG and RTG can be different country by country.
  • IPPS signal Universal Time Code
  • the repeater After the switching signal for relaying a the downlink subframe at the repeater and amplifying the downlink subframe signal transmitted from the base station, the repeater generates a switching signal for relaying an uplink subframe, which is a signal transmitted from a terminal, around the middle of the guard time, with the ending part of a downlink subframe, that is, the part which the power level of the downlink subframe rapidly decreases, as a reference, by monitoring the power level of the amplified downlink subframe signal, and then keeps it until a switching signal for relaying the next downlink subframe is generated.
  • a switching signal for relaying an uplink subframe which is a signal transmitted from a terminal, around the middle of the guard time
  • the switching signal can reduce interference within the repeater by on/ off of the power fed to devices amplifying or modulating the TDD signal within the repeater, in other words, by turning off the power to amplifying or modulating devices which are not amplifying or modulating the TDD signal according to time.
  • the repeater In order to relay a downlink subframe, which is the transfer direction of signals from the base station to a terminal, the repeater uses devices like amplifier, while it also uses an amplifier and other devices for relaying a uplink subframe, the signal transmission direction from a terminal to the base station. Since the communication signal of the TDD method used the same frequency for uplink and downlink signals, an unwanted situation like oscillation within the repeater can occur. To prevent this, by activating devices only for uplink when relaying uplink signals and activating ones only for downlink when relaying downlink signals, a phenomenon like oscillation or mutual interference can be avoided.
  • the repeater by delaying as long as the propagation delay of the radio signal according to the distance between the base station and repeater from the timing signal of the GPS signal and thus switching by adjusting to the timing reference signal for relaying the TDD signal, the error of switching timing according to the propagation delay of radio waves by the distance between the base station and repeater can be reduced.
  • This propagation delay time can be obtained by using a device like a GPS terminal with the map having the distance between the base station and repeater. Furthermore, adding or subtracting the signal processing time occurring at the repeater to the propagation delay time from the base station to the repeater, which is found by the method, enables more accurate switching.
  • a Yagi antenna is mainly used as an antenna to perform transmitting/receiving function between the base station and repeater. By adding a dipole antenna, which can receive the GPS signal from GPS satellites, on the central support of this yagi antenna, the antenna transmitting/receiving with the base station and receiving a GPS signal with a single antenna structure can be embodied.
  • the GPS TDD repeater for relaying Time Division Duplexing signals that, at the base station, transmits by setting the downlink subframe transmitting time of a TDD signal with the timing signal of GPS as a reference, and at the repeater, switches according to the timing signal of GPS by setting as a timing reference signal for relaying a TDD signal including the downlink subframe
  • [33] can be composed with the inclusion of a reference timer extracting the timing signal from GPS signals, a power sensor monitoring the RF power level change of the downlink subframe signal to be relayed at the repeater, a switching unit which generates a switching signal for relaying the downlink subframe of the TDD signal frame with the timing signal input of the reference timer as a reference timing and also generates a switching signal for relaying the uplink subframe of the TDD signal frame using the reduced amount according to the time of the monitored power level of the power sensor, and the main body of the repeater.
  • a reference timer extracting the timing signal from GPS signals
  • a power sensor monitoring the RF power level change of the downlink subframe signal to be relayed at the repeater
  • a switching unit which generates a switching signal for relaying the downlink subframe of the TDD signal frame with the timing signal input of the reference timer as a reference timing and also generates a switching signal for relaying the uplink subframe of the TDD signal frame using the reduced amount according
  • the switching unit of the repeater generates a switching signal for relaying the downlink subframe of the TDD signal frame with the timing signal extracted from GPS signals as a reference time, and generates a switching signal for relaying the uplink subframe of the TDD signal frame from the power level decrease of the downlink subframe signal according to the time by monitoring the power level change of the downlink subframe signal according to time to be relayed at the repeater.
  • the repeater relays the downlink subframe signal at an accurate time, even though the signal strength is low, by generating a switching signal for relaying the downlink subframe, and adaptively generates a switching signal according to the ratio of the downlink subframe and uplink subframe with accurate switching by generating a switching signal for relaying the uplink subframe from the signal level decrease of the downlink subframe by monitoring the RF signal level change of the downlink subframe.
  • the TDD repeater which synchronizes with the same time as the base station using the timing signal of GPS signals, compensates the propagation delay of radio waves between the base station and repeater by entering the propagation delay time of radio waves between the base station and repeater and thus delaying at the reference time, and makes more accurate switching possible by adding/subtracting a signal processing time taking place at the repeater to/from the propagation delay time of the base station signal;
  • the repeater By adding a dipole antenna, which receives the GPS signal, to the directional antenna of the repeater to perform the transmitting/receiving function between the base station and repeater, the repeater transmits/receives with the base station and receives the GPS signal with a single antenna structure, and expands the coverage of the base station signal and efficiently receives the GPS signal by additionally installing a dual amplifier.
  • FIG. 1 is a diagram showing that the ratio of the downlink subframe and uplink subframe of a TDD signal frame adaptively changes in the frame configuration of the specifications for 2.3GHz Band Portable Internet Serviceusing the TDD signal;
  • FIG. 2 is a diagram showing a frame of the TDD signal
  • FIG. 3 is a block diagram of an adaptive GPS TDD repeater according to an embodiment example of this invention.
  • FIG. 4 is a flow chart showing an operation example of an adaptive GPS TDD repeater
  • FIG. 5 is a drawing showing a switching signal occurring at the switching unit
  • FIG. 6 is a drawing showing an embodiment example of a dual antenna
  • FIG. 7 is a diagram showing an embodiment example of a dual amplifier.
  • FIG. 1 is a diagram showing that the ratio of the downlink subframe and uplink subframe of the TDD signal frame changes adaptively according to the usage amount of the downlink subframe and that of the uplink subframe of users in the frame configuration of the specifications for 2.3GHz Band Portable Internet Service using the TDD signal.
  • FIG. 2 is a diagram showing a frame of the TDD signal, which comprises in the order of a downlink subframe (downlink) transmitted from the base station to a terminal, TTG (Tx/Rx Transition Gap), an uplink subframe (uplink) transmitted from a terminal to the base station, and RTG (Rx/Tx Transition Gap). It shows the time length of a frame is 5mS.
  • FIG. 3 is a block diagram of an adaptive GPS TDD repeater (20) according to an embodiment example of this invention.
  • the base station (22) of the TDD communication system receives the GPS signal from GPS satellites (24), generates and transmits the frame of the TDD communication system by synchronizing at every base station (22) with the timing signal of the GPS signal as a reference.
  • the downlink subframe transmitted from the base station (22) is received at the dual antenna (28), in other words, a single antenna structure with directivity in the direction of the base station (22).
  • the downlink subframe received like this is connected to the repeater through the cable after amplification with low noise by a dual amplifier (30), in other words, an amplifier inserted between the cable connecting the single antenna structure with the main body of the repeater which is not installed inside the repeater but installed around the antenna like an antenna tower.
  • the cable performs the function of transmitting high-frequency waves as well as of feeding power to the dual amplifier (30).
  • the GPS signals can be separated from the TDD signal.
  • the GPS signal separated like this is fed to the reference timer (46).
  • the reference timer (46) outputs, from the received GPS signal, the timing signal
  • the timing signal (60) of the GPS signal which is 1-Hz cycle pulse synchronized to UTC (Universal Time Code), and then feeds it to the switching unit (44).
  • the timing signal (60) outputed from the reference timer (46) mainly outputs one pulse per second. In other words, it is IPPS (1 pulse per second), and the rising time of a pulse is synchronized to the UTC (Universal Time Code) and therefore reflects accurate timing information.
  • the switching unit (44) can be composed of a microprocessor and program, and is configured for the factors such as the distance or propagation delay time to be entered according to the distance (26) between the base station (22) and repeater (20) with the port for a distance entry pad (48).
  • the switching unit (44) delay (68) as much as the propagation time of the base station- repeater radio signals, which was entered from the distance entering pad (48), from the timing signal (60), and thus outputs and keeps a switching signal (62) according to time, which can relay a downlink subframe, until the time of entering a timing signal (60) spaced at a frame time period (5mS) at the next GPS signal.
  • the switching signal (62) that can continuously relay downlink subframes with the last timing signal as a reference can be outputed and maintained until the timing signal of the GPS signal is entered.
  • the switching signal (62) that can relay a downlink subframe generated from the switching unit (44) is transferred to the switch (32).
  • the downlink subframe transmitted from the base station is fed to the terminal (54) after amplification (52) through the downlink path (38), and some power is fed to the power sensor (50) and thus the RF power level change of the downlink subframe (76) is monitored.
  • the power sensor (50) At the end of the downlink subframe (76), power becomes low rapidly.
  • the switching unit (44) When the power sensor (50) detects the power becoming low, the time of the RF power rapidly decreasing is entered at the switching unit (44), the switching unit (44) generates and keeps a switching signal (64) that can relay the uplink subframe at the downlink path condition (38) of the switching signal, and thus generates a switching control signal for operating the uplink path (36) at the downlink path (38) activation condition, also drives (40) active devices (34) such as amplifier or mixer, and then does not drive active devices of the downlink path by cutting off power.
  • active devices (34) such as amplifier or mixer
  • the uplink subframe (78) signal of a terminal (54) is fed to the base station (22) by going through the uplink path (36), the dual amplifier (30) and the dual antenna (28).
  • FIG. 4 is a flow chart showing an operation example of the adaptive GPS TDD repeater.
  • Step Sl is a step to inspect a reference timing signal input, IPPS signal entered from the GPS signal. At this time, if the reference timing signal is not entered, the reference timing signal input can be continuously monitored. In this case, when the reference timing signal is entered, Step S3 which is the next step is performed.
  • Step S2 is a step for entering the delay time according to the propagation of radio signals between the base station and repeater and also entering this value to Step S3.
  • Step S3 is a step for delaying the delay time entered at Step S2 from the reference time signal entered at Step Sl. The signal delayed from the reference time signal and then it is entered to Step S4.
  • Step S4 generates a switching signal, which relays a downlink subframe, with the signal entered at Step S3 as a reference. Then Step S5 is performed.
  • Step S5 the decrease of power level according to the time of the downlink subframe relayed after Step S4 is monitored for a frame time (5mS). If the power level of the downlink subframe decreases by more than a predefined RF power level, Step S6 is performed. Otherwise, Step S7 is carried out.
  • Step S6 generates an uplink switching signal that can relay an uplink subframe by using the point of time, which the power level of the downlink subframe decreases by more than a predefined RF power level at Step S5, as a reference. Then Step S7 is conducted.
  • Step S7 is a step to inspect whether or not a frame time (5mS) has passed, after Step
  • Step S6 for a downlink switching signal that can relay a downlink subframe every frame time length has to be generated. It is inspected until a frame time passes. After a frame time, Step S8 is performed. At this time, the uplink switching signal of Step S6 remains the same.
  • Step S8 is a step for verifying whether the input cycle (IPPS: IS) of the reference timing signal has passed from entering the reference timing signal. If the input cycle (IS) of the reference timing signal has passed, Step Sl that confirms the existence of the reference timing signal input is carried out. Otherwise, Step S4 is again performed.
  • IPPS input cycle
  • Step S4 is conducted.
  • FIG. 5 is a drawing showing a switching signal occurring at the switching unit (44).
  • the TDD (Time Division Duplexing) system has a frame (72) comprising the downlink time (70), uplink time (74), and guard time such as TTG and RTG.
  • a frame structure With this frame structure, data exchange is made using the frame between the base station (22) and a terminal (54).
  • the repeater receives the GPS signal and uses IPPS signal, synchronized to the
  • FIG. 6 is a drawing showing an embodiment example of a dual antenna. It consists of a yagi antenna composed of waveguide director (102), resonator (104) and reflector (106), which can directionally receive signals from the base station, and a GPS dipole antenna (108) located at the antenna central support (120) shared by the yagi antenna and located at the back side with a certain distance separated, and thus a single antenna structure (dual antenna) is composed of a yagi antenna with strong directivity and a GPS-receiving dipole antenna that receives a GPS signal transmitted from a satellite (118).
  • a dual amplifier (100, 30) is installed at the antenna support close to the antenna (28), and thus the amplifier effectively amplifies signals.
  • FIG. 7 is a diagram showing an embodiment example of a dual amplifier (100, 30).
  • the dual amplifier (100, 30) separates the uplink path (162) from the downlink path (164) using two circulators (150), and the downlink path (164) of the dual amplifier comprises a dual amplifier high-frequency filter (152), a coupler (156), and low noise broadband amplifier (158) of the dual amplifier.
  • the driving power of the amplifier can be provided by separating only power from the power fed with a coaxial cable from the main body of the repeater.
  • an uplink signal is outputed to the broadband antenna through the two circulators (150), and a downlink subframe signal received from the antenna is outputed through a circulator (150), dual amplifier high-frequency filter (152), coupler (156), low noise broadband amplifier (158) of the dual amplifier, and a circulator (150).
  • the GPS signal is also outputed to the repeater side through the GPS filter (154), coupler (156), low noise broadband amplifier (158) of the dual amplifier, and circulator (150).
  • the adaptive GPS TDD repeater and method according to the present invention can be used as a repeater of the portable Internet using the TDD signal, and it can also be applied in an optical repeater operating by an optical cable connected between the base station and repeater.

Landscapes

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

Abstract

The present invention relates to a repeater system that enables the provision of good-quality calls to terminal users by amplifying weak radio signals between a base station and terminals, and, more specifically, a relaying method and the repeater that generate a switching signal for relaying a downlink subframe from the timing signal of GPS and the distance between the base station and the repeater for the up link and down link switching synchronization with the base station and a terminal in the TDD (Time Division Duplexing) system, and that convert into a switching signal for relaying a uplink subframe at the ending time of a downlink subframe by detecting the amplified downlink subframe signal level transmitted from the base station at the repeater and thus inspecting the change of the power level, and that adaptively generate a switching signal according to the ratio of the downlink subframe and uplink subframe within a frame by detecting the time length of the downlink subframe within the frame.

Description

Description ADAPTIVE GPS TDD REPEATER AND METHOD
Technical Field
[1] The present invention relates to a repeater and the method that enable the provision of good-quality calls to terminal users by amplifying weak radio signals between a base station and terminals, and, more specifically, a relaying method and the repeater that the up link and down link switching synchronization with the base station and terminals in a repeater of the TDD (Time Division Duplexing) system, by detecting the timing signal of the GPS and the power change of the downlink subframe signal level transmitted from the base station, generate a switching signal from these. Background Art
[2] In a portable Internet signal using the Time Division Duplexing (hereinafter referred to as the TDD) signal, the time length of a frame is 5mS, a frame is arranged in the order of and composed of a downlink subframe, TTG (Tx/Rx Transition Gap), a uplink subframe, and RTG (Rx/Tx Transition Group), and the ratio of the downlink subframe and uplink subframe within a frame varies adaptively according to the number of users and the amount of data to be transmitted.
[3] In this case, the repeater of the TDD system must synchronize switching with the base station and terminal by generating a signal used in the up link and down link switching synchronization for relaying the base station signal and the terminal signal.
[4] As a method to acquire the up link and down link switching synchronization in a repeater of this TDD system, a method and the equipment, which generate a down link switching signal for relaying a downlink subframe by inspecting down link subframe's receiving radio signal power level and generate a switching signal for relaying a uplink subframe by receiving an uplink subframe radio signal power level from a terminal, ware proposed.
[5] But because this method must generate a switching synchronization signal by differentiating at the repeater an uplink subframe signal from the same frequency of the downlink subframe at the TDD system, it is difficult to differentiate the signals using this same frequency so problems in switching can occur. In addition, since a switching synchronized by a receiving radio signal power level, it was difficult to extract the synchronization signal from a low receiving signal level, and there was also a problem of malfunction due to incoming noises.
[6] Another proposed repeater system synchronizing at the same time as the base station using the time signal of GPS can have a problem due to the error of a switching synchronization occurring by the propagation delay time of radio signal because of the propagation distance between the base station and a repeater. In a portable Internet system like WiBro, the ratio of a downlink subframe and an uplink subframe changes adaptively according to the usage ratio of the uplink and downlink, and thus there has been a problem which cannot adaptively generate a switching signal at a repeater matching to this TDD signal. Besides, there was another inconvenience which had to separately install a GPS antenna and GPS cable for receiving the GPS signal.
[7] Another proposed repeater system which extracts a switching signal by demodulation from receiving a downlink signal from the base station, there is a problem that a signal received from the base station has to be delayed during the time of extracting a switching signal from the signal transmitted from the base station at a repeater and because a switching signal has to be extracted by installing a modem at the repeater, the system becomes complex and there is another problem that the different kinds of TDD signals cannot be applied. Disclosure of Invention Technical Problem
[8] In the present invention in order to solve the problems, by relaying a downlink subframe after generating a downlink switching signal for relaying a downlink subframe using as a reference of a switching synchronization with the timing signal of GPS as a reference by receiving the GPS signal at a repeater, the system solve a problem that cannot differentiate a downlink subframe signal from the base station and an uplink subframe signal from a terminal, which can occur when generating a switching signal only by a receiving radio signal power level receiving at the repeater, and another problem that it is difficult to generate a switching signal in case the strength of a receiving signal is low power level;
[9] After detecting the RF (Radio Frequency) signal power level of a downlink subframe signal to be relayed and thus locating the ending point of a downlink subframe where the power level is starting to decrease rapidly, and generating an uplink switching signal for relaying an uplink subframe and then keeping until the next downlink switching signal, the repeater adaptively generates a switching signal according to the ratio of the downlink subframe and uplink subframe, which could not be embodied in the switching plan using only the GPS signal.
[10] For the error of a switching synchronization occurred by the propagation delay according to the propagation distance between a base station and a repeater, which can be a problem in the TDD repeater synchronizing with the same time as the base station using the timing signal of GPS, the repeater solves the problem that can occur owing to the propagation delay by providing as a timing reference signal for switching synchronization through delaying from the timing signal of GPS signal by as much as the propagation delay time of the base station signal at the timing signal of GPS signal which is a timing reference signal for the switching synchronization at the repeater by calculating the propagation delay time of a downlink subframe transmitted from the base station of the base station-repeater propagation through entering the base station- repeater distance with the preparation of a unit like a distance enterer at the repeater after measuring the distance between the base station and the repeater. And makes more accurate switching possible by applying after adding or subtracting various signal processing times taking place in the repeater from the propagation time of the base station signal;
[11] The present invention can reduce mutual interference within the repeater by alternation of on and off through the control of RF modules consisting of active devices such as LNA (Low Noise Amplifier) and active mixer, which are downlink processing devices within the repeater for relaying downlink subframe signals, and the control of the active RF devices used as uplink processing devices for relaying uplink subframe signals;
[12] By adding a dipole antenna for receiving the GPS signal to the directional antenna of the repeater transmitting/receiving between the base station and repeater, a single antenna structure can transmit/receive the base station signals and receive the GPS signal;
[13] By adding a dual amplifier, which can amplify both a signal from the base station and the GPS signal, to a directional antenna receiving the GPS signal as well as transmitting and receiving with the signal of the base station, the present invention seeks to expand the coverage of the base station and effectively receive the GPS signal. Technical Solution
[14] The adaptive GPS TDD (Time Division Duplexing) repeater and method of the present invention for achieving these purposes,
[15] in the TDD relaying method that, at the base station, transmits by setting the downlink subframe transmitting time of a TDD signal with the timing signal of GPS signal as a reference, and at the repeater, switches the timing signal of GPS signal by setting as a timing reference signal for relaying a TDD signal including the downlink subframe:
[16] (a) The repeater acquires a timing signal from GPS signal, and setting this timing signal as the timing reference signal for relaying a downlink subframe transmitted from the base station;
[17] (b) The repeater, from the timing reference signal for relaying the downlink subframe, relay the downlink subframe by generating a switching signal relaying the downlink subframe of the TDD signal frame; [18] (c) When the repeater relays the downlink subframe of the TDD signal frame, monitor the change of power level according to the time of the amplified downlink subframe and thus set the timing reference for relaying the uplink subframe of the TDD signal frame with the time of the RF power level decreasing by more than a predetermined level as a reference; and
[19] (d) The repeater, from the reference time for relaying the uplink subframe, relay the uplink subframe by generating a switching signal relaying the uplink subframe of the TDD signal frame,
[20] Along with the (a) through (d), because a switching signal is generated by differentiating the time of a downlink subframe signal transmitted from the base station of the TDD signal, the repeater relays a downlink subframe signal at the time the downlink subframe must be relayed, and the up link/ down link switching ratio of the switching signal adaptively also changes to the adaptively changing TDD signal and thus the repeater operates without any data loss or malfunction.
[21] The portable Internet system of the TDD method operates by synchronizing the transmitting time of a frame with the GPS signal at the base station as a reference. A frame of the TDD signal is arranged in the order of and composed of a downlink subframe transmitted to the terminal direction by generating with the timing signal of GPS signal at the base station as a reference, TTG (Tx/Rx Transition Gap) where data transmission is not made, an uplink subframe transmitted from a terminal to the base station, and RTG (Rx/Tx Transition Gap), and the time length per frame of this TDD signal is 5mS. In this case, the name of the frame elements such as TTG and RTG can be different country by country. Also in a commercial GPS module, a signal generating one pulse per second (IPPS signal) synchronized to the UTC (Universal Time Code) can be outputed.
[22] As the frame of the TDD communication system has the time length of 5mS, in case of generating a switching signal using 1-PPS timing signal outputed from the GPS modem, signals to relay 200 frames for every IPPS must be generated. In other words, switching signals for relaying 200 downlink subframes must be generated. In this case, IPPS(I Pulse per Second) signal outputed from the GPS signal, that is, after the timing signal, 200 switching signals spaced at a 5mS interval for relaying downlink subframes are outputed according to the time. In this case, when there is no input of IPPS including the UTC information of GPS, the switching signal for continuously relaying downlink subframes spaced at a 5mS interval can be outputed until the lPPS-signal input is provided.
[23] After the switching signal for relaying a the downlink subframe at the repeater and amplifying the downlink subframe signal transmitted from the base station, the repeater generates a switching signal for relaying an uplink subframe, which is a signal transmitted from a terminal, around the middle of the guard time, with the ending part of a downlink subframe, that is, the part which the power level of the downlink subframe rapidly decreases, as a reference, by monitoring the power level of the amplified downlink subframe signal, and then keeps it until a switching signal for relaying the next downlink subframe is generated.
[24] In addition, the switching signal can reduce interference within the repeater by on/ off of the power fed to devices amplifying or modulating the TDD signal within the repeater, in other words, by turning off the power to amplifying or modulating devices which are not amplifying or modulating the TDD signal according to time.
[25] In order to relay a downlink subframe, which is the transfer direction of signals from the base station to a terminal, the repeater uses devices like amplifier, while it also uses an amplifier and other devices for relaying a uplink subframe, the signal transmission direction from a terminal to the base station. Since the communication signal of the TDD method used the same frequency for uplink and downlink signals, an unwanted situation like oscillation within the repeater can occur. To prevent this, by activating devices only for uplink when relaying uplink signals and activating ones only for downlink when relaying downlink signals, a phenomenon like oscillation or mutual interference can be avoided.
[26] Also in the repeater, by delaying as long as the propagation delay of the radio signal according to the distance between the base station and repeater from the timing signal of the GPS signal and thus switching by adjusting to the timing reference signal for relaying the TDD signal, the error of switching timing according to the propagation delay of radio waves by the distance between the base station and repeater can be reduced.
[27] This is for compensating the error of switching synchronization of the downlink subframe signal transmitted from the base station occurring due to the propagation delay due to the distance between the base station and repeater because the repeater is synchronizing the up link and down link switching using the timing signal of GPS by the same method as the base station. This propagation delay time can be obtained by using a device like a GPS terminal with the map having the distance between the base station and repeater. Furthermore, adding or subtracting the signal processing time occurring at the repeater to the propagation delay time from the base station to the repeater, which is found by the method, enables more accurate switching.
[28] And, if transmitting and receiving signals with a dual antenna, that is, a single antenna structure that transmits/receives the TDD signal and also receives the GPS signal using a single antenna central support, the advantages of space utilization and easy installation can be obtained by integrating a GPS receiving antenna and the TDD transmitting/receiving antenna at the same central support. [29] A Yagi antenna is mainly used as an antenna to perform transmitting/receiving function between the base station and repeater. By adding a dipole antenna, which can receive the GPS signal from GPS satellites, on the central support of this yagi antenna, the antenna transmitting/receiving with the base station and receiving a GPS signal with a single antenna structure can be embodied.
[30] If the TDD signal and the GPS signal received from the single antenna structure are entered into the main body of the repeater after amplification through a dual amplifier, in other words, an amplifier inserted between the cable connecting the main body of the repeater with the single antenna structure, not only the GPS signal but also the signal of the TDD signal is amplified and thus the input range, which the repeater can receive, is expanded. The receiving distance between the base station and repeater, therefore, can be widened.
[31] That is, by additionally installing a dual amplifier at the antenna that can amplify the base station signal and GPS signal with low noise, receiving the GPS signal effectively and widening the coverage of the base station signals can be sought.
[32] The GPS TDD repeater for relaying Time Division Duplexing signals that, at the base station, transmits by setting the downlink subframe transmitting time of a TDD signal with the timing signal of GPS as a reference, and at the repeater, switches according to the timing signal of GPS by setting as a timing reference signal for relaying a TDD signal including the downlink subframe
[33] can be composed with the inclusion of a reference timer extracting the timing signal from GPS signals, a power sensor monitoring the RF power level change of the downlink subframe signal to be relayed at the repeater, a switching unit which generates a switching signal for relaying the downlink subframe of the TDD signal frame with the timing signal input of the reference timer as a reference timing and also generates a switching signal for relaying the uplink subframe of the TDD signal frame using the reduced amount according to the time of the monitored power level of the power sensor, and the main body of the repeater.
[34] The switching unit of the repeater generates a switching signal for relaying the downlink subframe of the TDD signal frame with the timing signal extracted from GPS signals as a reference time, and generates a switching signal for relaying the uplink subframe of the TDD signal frame from the power level decrease of the downlink subframe signal according to the time by monitoring the power level change of the downlink subframe signal according to time to be relayed at the repeater.
[35] Besides, since service providers running data services using the TDD signals relay the TDD signals using the method and system like the one, they can effectively service the TDD signals at a cheaper cost. Advantageous Effects
[36] With the timing signal of GPS as a reference for a switching signal, the repeater relays the downlink subframe signal at an accurate time, even though the signal strength is low, by generating a switching signal for relaying the downlink subframe, and adaptively generates a switching signal according to the ratio of the downlink subframe and uplink subframe with accurate switching by generating a switching signal for relaying the uplink subframe from the signal level decrease of the downlink subframe by monitoring the RF signal level change of the downlink subframe.
[37] The TDD repeater, which synchronizes with the same time as the base station using the timing signal of GPS signals, compensates the propagation delay of radio waves between the base station and repeater by entering the propagation delay time of radio waves between the base station and repeater and thus delaying at the reference time, and makes more accurate switching possible by adding/subtracting a signal processing time taking place at the repeater to/from the propagation delay time of the base station signal;
[38] Prevent an oscillation by reducing mutual interference within the repeater through turning on and off the devices such as amplifier in the repeater by the control of a switching signal; and
[39] By adding a dipole antenna, which receives the GPS signal, to the directional antenna of the repeater to perform the transmitting/receiving function between the base station and repeater, the repeater transmits/receives with the base station and receives the GPS signal with a single antenna structure, and expands the coverage of the base station signal and efficiently receives the GPS signal by additionally installing a dual amplifier.
Brief Description of the Drawings
[40] FIG. 1 is a diagram showing that the ratio of the downlink subframe and uplink subframe of a TDD signal frame adaptively changes in the frame configuration of the specifications for 2.3GHz Band Portable Internet Serviceusing the TDD signal;
[41] FIG. 2 is a diagram showing a frame of the TDD signal;
[42] FIG. 3 is a block diagram of an adaptive GPS TDD repeater according to an embodiment example of this invention;
[43] FIG. 4 is a flow chart showing an operation example of an adaptive GPS TDD repeater;
[44] FIG. 5 is a drawing showing a switching signal occurring at the switching unit;
[45] FIG. 6 is a drawing showing an embodiment example of a dual antenna;
[46] FIG. 7 is a diagram showing an embodiment example of a dual amplifier.
Best Mode for Carrying Out the Invention [47] FIG. 1 is a diagram showing that the ratio of the downlink subframe and uplink subframe of the TDD signal frame changes adaptively according to the usage amount of the downlink subframe and that of the uplink subframe of users in the frame configuration of the specifications for 2.3GHz Band Portable Internet Service using the TDD signal.
[48] FIG. 2 is a diagram showing a frame of the TDD signal, which comprises in the order of a downlink subframe (downlink) transmitted from the base station to a terminal, TTG (Tx/Rx Transition Gap), an uplink subframe (uplink) transmitted from a terminal to the base station, and RTG (Rx/Tx Transition Gap). It shows the time length of a frame is 5mS.
[49] FIG. 3 is a block diagram of an adaptive GPS TDD repeater (20) according to an embodiment example of this invention;
[50] The base station (22) of the TDD communication system receives the GPS signal from GPS satellites (24), generates and transmits the frame of the TDD communication system by synchronizing at every base station (22) with the timing signal of the GPS signal as a reference.
[51] The downlink subframe transmitted from the base station (22) is received at the dual antenna (28), in other words, a single antenna structure with directivity in the direction of the base station (22).
[52] The downlink subframe received like this is connected to the repeater through the cable after amplification with low noise by a dual amplifier (30), in other words, an amplifier inserted between the cable connecting the single antenna structure with the main body of the repeater which is not installed inside the repeater but installed around the antenna like an antenna tower. In this case, the cable performs the function of transmitting high-frequency waves as well as of feeding power to the dual amplifier (30).
[53] In this case, if connecting a filter passing only a GPS signal to the cable, the GPS signals can be separated from the TDD signal. The GPS signal separated like this is fed to the reference timer (46).
[54] The reference timer (46) outputs, from the received GPS signal, the timing signal
(60) of the GPS signal, which is 1-Hz cycle pulse synchronized to UTC (Universal Time Code), and then feeds it to the switching unit (44). The timing signal (60) outputed from the reference timer (46) mainly outputs one pulse per second. In other words, it is IPPS (1 pulse per second), and the rising time of a pulse is synchronized to the UTC (Universal Time Code) and therefore reflects accurate timing information.
[55] The switching unit (44) can be composed of a microprocessor and program, and is configured for the factors such as the distance or propagation delay time to be entered according to the distance (26) between the base station (22) and repeater (20) with the port for a distance entry pad (48).
[56] Thereafter, after entering the timing signal (60) at the reference timer (46), the switching unit (44) delay (68) as much as the propagation time of the base station- repeater radio signals, which was entered from the distance entering pad (48), from the timing signal (60), and thus outputs and keeps a switching signal (62) according to time, which can relay a downlink subframe, until the time of entering a timing signal (60) spaced at a frame time period (5mS) at the next GPS signal. At this time, in case entering the timing signal of the GPS signal discontinues, the switching signal (62) that can continuously relay downlink subframes with the last timing signal as a reference can be outputed and maintained until the timing signal of the GPS signal is entered.
[57] The switching signal (62) that can relay a downlink subframe generated from the switching unit (44) is transferred to the switch (32). In this case, the downlink subframe transmitted from the base station is fed to the terminal (54) after amplification (52) through the downlink path (38), and some power is fed to the power sensor (50) and thus the RF power level change of the downlink subframe (76) is monitored. At the end of the downlink subframe (76), power becomes low rapidly. When the power sensor (50) detects the power becoming low, the time of the RF power rapidly decreasing is entered at the switching unit (44), the switching unit (44) generates and keeps a switching signal (64) that can relay the uplink subframe at the downlink path condition (38) of the switching signal, and thus generates a switching control signal for operating the uplink path (36) at the downlink path (38) activation condition, also drives (40) active devices (34) such as amplifier or mixer, and then does not drive active devices of the downlink path by cutting off power.
[58] Thereafter, the uplink subframe (78) signal of a terminal (54) is fed to the base station (22) by going through the uplink path (36), the dual amplifier (30) and the dual antenna (28).
Mode for the Invention
[59] FIG. 4 is a flow chart showing an operation example of the adaptive GPS TDD repeater. Step Sl is a step to inspect a reference timing signal input, IPPS signal entered from the GPS signal. At this time, if the reference timing signal is not entered, the reference timing signal input can be continuously monitored. In this case, when the reference timing signal is entered, Step S3 which is the next step is performed.
[60] Step S2 is a step for entering the delay time according to the propagation of radio signals between the base station and repeater and also entering this value to Step S3.
[61] Step S3 is a step for delaying the delay time entered at Step S2 from the reference time signal entered at Step Sl. The signal delayed from the reference time signal and then it is entered to Step S4. [62] Step S4 generates a switching signal, which relays a downlink subframe, with the signal entered at Step S3 as a reference. Then Step S5 is performed.
[63] At Step S5, the decrease of power level according to the time of the downlink subframe relayed after Step S4 is monitored for a frame time (5mS). If the power level of the downlink subframe decreases by more than a predefined RF power level, Step S6 is performed. Otherwise, Step S7 is carried out.
[64] Step S6 generates an uplink switching signal that can relay an uplink subframe by using the point of time, which the power level of the downlink subframe decreases by more than a predefined RF power level at Step S5, as a reference. Then Step S7 is conducted.
[65] Step S7 is a step to inspect whether or not a frame time (5mS) has passed, after Step
S6 or Step S5, for a downlink switching signal that can relay a downlink subframe every frame time length has to be generated. It is inspected until a frame time passes. After a frame time, Step S8 is performed. At this time, the uplink switching signal of Step S6 remains the same.
[66] Step S8 is a step for verifying whether the input cycle (IPPS: IS) of the reference timing signal has passed from entering the reference timing signal. If the input cycle (IS) of the reference timing signal has passed, Step Sl that confirms the existence of the reference timing signal input is carried out. Otherwise, Step S4 is again performed.
[67] At this time, if there is no input of the reference timing signal at the input cycle of the reference timing signal, again Step S4 is conducted.
[68] FIG. 5 is a drawing showing a switching signal occurring at the switching unit (44).
The TDD (Time Division Duplexing) system has a frame (72) comprising the downlink time (70), uplink time (74), and guard time such as TTG and RTG. With this frame structure, data exchange is made using the frame between the base station (22) and a terminal (54).
[69] Since the signal of portable Internet has a frame length of 5mS, communication is performed with 200 frames per second.
[70] The repeater receives the GPS signal and uses IPPS signal, synchronized to the
UTC time, as a reference. Then it delays a downlink switching signal (62) for relaying a downlink subframe (76) by as long as the propagation delay (68) between the base station and repeater, and then output and keep the time length cycle (72) of a frame according to time. After the downlink switching signal, a power sensor (50) detects the power of the downlink subframe to be relayed and uses the time of rapidly decreasing RF power as a reference. Then the repeater generates and maintains a switching signal (64) for relaying an uplink subframe at the switching unit (44). Thereafter, next downlink subframes (76) are relayed by downlink switching signals (62) ouputed periodically. [71] FIG. 6 is a drawing showing an embodiment example of a dual antenna. It consists of a yagi antenna composed of waveguide director (102), resonator (104) and reflector (106), which can directionally receive signals from the base station, and a GPS dipole antenna (108) located at the antenna central support (120) shared by the yagi antenna and located at the back side with a certain distance separated, and thus a single antenna structure (dual antenna) is composed of a yagi antenna with strong directivity and a GPS-receiving dipole antenna that receives a GPS signal transmitted from a satellite (118). In addition, a dual amplifier (100, 30) is installed at the antenna support close to the antenna (28), and thus the amplifier effectively amplifies signals.
[72] FIG. 7 is a diagram showing an embodiment example of a dual amplifier (100, 30).
The dual amplifier (100, 30) separates the uplink path (162) from the downlink path (164) using two circulators (150), and the downlink path (164) of the dual amplifier comprises a dual amplifier high-frequency filter (152), a coupler (156), and low noise broadband amplifier (158) of the dual amplifier. The driving power of the amplifier can be provided by separating only power from the power fed with a coaxial cable from the main body of the repeater.
[73] In the dual amplifier, an uplink signal is outputed to the broadband antenna through the two circulators (150), and a downlink subframe signal received from the antenna is outputed through a circulator (150), dual amplifier high-frequency filter (152), coupler (156), low noise broadband amplifier (158) of the dual amplifier, and a circulator (150). The GPS signal is also outputed to the repeater side through the GPS filter (154), coupler (156), low noise broadband amplifier (158) of the dual amplifier, and circulator (150). Industrial Applicability
[74] The adaptive GPS TDD repeater and method according to the present invention can be used as a repeater of the portable Internet using the TDD signal, and it can also be applied in an optical repeater operating by an optical cable connected between the base station and repeater.

Claims

Claims
[1] A method for Adaptive GPS TDD repeater that, at the base station, transmits signal by setting the transmitting time of a TDD signal with the timing signal of GPS signal as a reference, and at the repeater, switches up link and down link with the timing sianal of GPS signal by setting as a timing reference signal in order to relay the TDD signal comprising
(a) a step that the repeater acquires the timing signal from the GPS signal and sets this timing signal as a timing reference signal for relaying the TDD signal transmitted from the base station;
(b) a step that the repeater relays the TDD signal by generating a switching signal which can relay the TDD signal frame from the timing reference signal;
(c) a step that, when the repeater relays a TDD signal transmitted from the base station, sets a reference time for relaying the TDD signal frame to be transmitted from the terminal to the base station direction with the point of time, where the power level decreases by more than a predefined RF power level by monitoring the power level of the TDD signal transmitted from the base station according to time, used as a reference;
(d) a step that, the repeater relays the TDD signal, which was transmitted from the terminal, to the direction of the base station, by generating a switching signal which relays the TDD signal frame transmitted from a terminal to the direction of the base station, from the reference time for relaying the TDD signal frame transmitted from the terminal to the direction of the base station.
[2] The method as set forth in claim 1 further comprising a step that the switching signal turns on or off the power of the devices amplifying or modulating the TDD signal within the TDD repeater and thus turns off the power of the amplifying or modulating devices according to time which are not amplifying or modulating the TDD signal according to time.
[3] A method for Adaptive GPS TDD repeater that, at the base station, transmits signal by setting the transmitting time of a TDD signal with the timing signal of GPS signal as a reference, and at the repeater, switches up link and down link with the timing sianal of GPS signal by setting as a timing reference signal in order to relay the TDD signal comprising a step that, the repeater down link switching time is adjusted by the distance between the base station and repeater from the timing signal of the GPS signal at the repeater
[4] A method for Adaptive GPS TDD repeater that, at the base station, transmits signal by setting the transmitting time of a TDD signal with the timing signal of GPS signal as a reference, and at the repeater, switches up link and down link with the timing sianal of GPS signal by setting as a timing reference signal in order to relay the TDD signal comprising a step of that, the repeater having the characteristics of a single antenna structure that transmits/receives the TDD signal and receives the GPS signal by using a single antenna central support.
[5] The method as set forth in claim 4 further comprising a step that, the TDD signal and the GPS signal received from the single antenna structure are entered into the main body of the repeater after amplification through an amplifier inserted between the cable connecting the main body of the repeater with the single antenna structure.
[6] Apparatus for Adaptive GPS TDD repeater that, at the base station, transmits signal by setting the transmitting time of a TDD signal with the timing signal of GPS signal as a reference, and at the repeater, switches up link and down link with the timing sianal of GPS signal by setting as a timing reference signal in order to relay the TDD signal comprising a reference timer that extracts the timing signal from the GPS signal; a power sensor that detects the power level change of the downlink subframe signal to be relayed at the repeater; a switching unit that generates a switching signal for relaying a TDD signal frame transmitted from the base station with the timing signal of the reference timer as a reference time, and also generates a switching signal for relaying a TDD signal frame transmitted from a terminal to the base station with the time- related power change level of the monitored power level of the power sensor as a reference.
[7] Apparatus for Adaptive GPS TDD repeater that, at the base station, transmits signal by setting the transmitting time of a TDD signal with the timing signal of
GPS signal as a reference, and at the repeater, switches up link and down link with the timing sianal of GPS signal by setting as a timing reference signal in order to relay the TDD signal comprising the switching unit that generates a switching signal for relaying the TDD signal frame transmitted from the base station with the timing signal extracted from the
GPS signal as a reference, and also generates a switching signal for relaying the TDD signal frame transmitted from a terminal to the direction of the base station by monitoring the power level changed of the TDD signal transmitted from the base station
[8] The method to service the TDD signal by relaying the TDD signal using any one of claim 1 to 5
PCT/KR2006/002419 2005-06-29 2006-06-22 Adaptive gps tdd repeater and method WO2007001134A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020050056634 2005-06-29
KR10-2005-0056634 2005-06-29
KR20050114878 2005-11-29
KR10-2005-0114878 2005-11-29

Publications (1)

Publication Number Publication Date
WO2007001134A1 true WO2007001134A1 (en) 2007-01-04

Family

ID=37595350

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2006/002419 WO2007001134A1 (en) 2005-06-29 2006-06-22 Adaptive gps tdd repeater and method

Country Status (2)

Country Link
KR (1) KR20070001791A (en)
WO (1) WO2007001134A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009004552A1 (en) * 2007-06-29 2009-01-08 Nokia Corporation Improved relay node operation in a communication system
CN110071791A (en) * 2013-10-30 2019-07-30 安德鲁无线系统有限公司 Switching subsystem for the distributing antenna system using time division duplex
CN111315008A (en) * 2020-02-18 2020-06-19 东南大学 Communication time sequence setting method for control station and mobile station
US11297514B2 (en) * 2018-07-23 2022-04-05 Solid, Inc. Repeater and method of operation thereof
WO2023205182A1 (en) * 2022-04-18 2023-10-26 Pivotal Commware, Inc. Time-division-duplex repeaters with global navigation satellite system timing recovery
US11843955B2 (en) 2021-01-15 2023-12-12 Pivotal Commware, Inc. Installation of repeaters for a millimeter wave communications network
US11844050B2 (en) 2020-09-08 2023-12-12 Pivotal Commware, Inc. Installation and activation of RF communication devices for wireless networks
US11929822B2 (en) 2021-07-07 2024-03-12 Pivotal Commware, Inc. Multipath repeater systems
US11968593B2 (en) 2020-08-03 2024-04-23 Pivotal Commware, Inc. Wireless communication network management for user devices based on real time mapping
US11973568B2 (en) 2020-05-27 2024-04-30 Pivotal Commware, Inc. RF signal repeater device management for 5G wireless networks
US12010703B2 (en) 2022-11-03 2024-06-11 Pivotal Commware, Inc. Smart repeater systems

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101403603B1 (en) * 2007-09-04 2014-06-03 삼성전자주식회사 Apparatus and method for receiving gps signal in a communication system
KR200447673Y1 (en) * 2008-06-03 2010-02-11 에이티아이(주) Global positioning system device unit for repeater of mobile radio communication network system
CN101826908B (en) * 2009-03-06 2014-02-26 中兴通讯股份有限公司南京分公司 Data transmission method of relay system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000134143A (en) * 1998-10-23 2000-05-12 Fujitsu Ltd Radio relay system utilizing time division multiple access time division two-way transmission system
US6108364A (en) * 1995-08-31 2000-08-22 Qualcomm Incorporated Time division duplex repeater for use in a CDMA system
JP2002111571A (en) * 2000-09-28 2002-04-12 Nippon Telegr & Teleph Corp <Ntt> Radio repeater
US20040114545A1 (en) * 2002-12-16 2004-06-17 Edwards Keith Russell Phase error detection method for magnetic wall displacement type of magneto-optical recording device
KR20060031895A (en) * 2004-10-11 2006-04-14 에스케이 텔레콤주식회사 Method for controlling switching of tdd repeater by using gps signal and switch control apparatus therefor for use in portable internet system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6108364A (en) * 1995-08-31 2000-08-22 Qualcomm Incorporated Time division duplex repeater for use in a CDMA system
JP2000134143A (en) * 1998-10-23 2000-05-12 Fujitsu Ltd Radio relay system utilizing time division multiple access time division two-way transmission system
JP2002111571A (en) * 2000-09-28 2002-04-12 Nippon Telegr & Teleph Corp <Ntt> Radio repeater
US20040114545A1 (en) * 2002-12-16 2004-06-17 Edwards Keith Russell Phase error detection method for magnetic wall displacement type of magneto-optical recording device
KR20060031895A (en) * 2004-10-11 2006-04-14 에스케이 텔레콤주식회사 Method for controlling switching of tdd repeater by using gps signal and switch control apparatus therefor for use in portable internet system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009004552A1 (en) * 2007-06-29 2009-01-08 Nokia Corporation Improved relay node operation in a communication system
CN110071791B (en) * 2013-10-30 2022-04-19 安德鲁无线系统有限公司 Switching subsystem for distributed antenna system utilizing time division duplexing
CN110071791A (en) * 2013-10-30 2019-07-30 安德鲁无线系统有限公司 Switching subsystem for the distributing antenna system using time division duplex
AU2018229537B2 (en) * 2013-10-30 2020-03-19 Andrew Wireless Systems Gmbh Switching sub-system for distributed antenna systems using time division duplexing
US11362749B2 (en) * 2013-10-30 2022-06-14 Andrew Wireless Systems Gmbh Switching sub-system for distributed antenna systems using time division duplexing
US11297514B2 (en) * 2018-07-23 2022-04-05 Solid, Inc. Repeater and method of operation thereof
CN111315008A (en) * 2020-02-18 2020-06-19 东南大学 Communication time sequence setting method for control station and mobile station
CN111315008B (en) * 2020-02-18 2022-03-08 东南大学 Communication time sequence setting method for control station and mobile station
US11973568B2 (en) 2020-05-27 2024-04-30 Pivotal Commware, Inc. RF signal repeater device management for 5G wireless networks
US11968593B2 (en) 2020-08-03 2024-04-23 Pivotal Commware, Inc. Wireless communication network management for user devices based on real time mapping
US11844050B2 (en) 2020-09-08 2023-12-12 Pivotal Commware, Inc. Installation and activation of RF communication devices for wireless networks
US11843955B2 (en) 2021-01-15 2023-12-12 Pivotal Commware, Inc. Installation of repeaters for a millimeter wave communications network
US11929822B2 (en) 2021-07-07 2024-03-12 Pivotal Commware, Inc. Multipath repeater systems
WO2023205182A1 (en) * 2022-04-18 2023-10-26 Pivotal Commware, Inc. Time-division-duplex repeaters with global navigation satellite system timing recovery
US11937199B2 (en) 2022-04-18 2024-03-19 Pivotal Commware, Inc. Time-division-duplex repeaters with global navigation satellite system timing recovery
US12010703B2 (en) 2022-11-03 2024-06-11 Pivotal Commware, Inc. Smart repeater systems

Also Published As

Publication number Publication date
KR20070001791A (en) 2007-01-04

Similar Documents

Publication Publication Date Title
WO2007001134A1 (en) Adaptive gps tdd repeater and method
US7844216B2 (en) Wireless repeater using a single RF chain for use in a TDD wireless network
JP2007507132A (en) Method and apparatus for bi-directional synchronous transfer of radio signals
JPH10247874A (en) Time-division duplex system portable telephone repeater
TW200509561A (en) Antenna matching device and method thereof
US20110267976A1 (en) Wireless relay apparatus and wireless relay system
WO2012079187A1 (en) A base station subsystem, a rbs part and a tma part and methods thereof for synchronizing the rbs part and the tma part
CN102461007A (en) Method for controlling transmission/reception timing of base station antenna for tdd wireless communications and base station antenna using same
CN103181099A (en) Repeater device
RU2012127441A (en) WIRELESS DEVICE FOR WIRELESS COMMUNICATION AND METHOD FOR COMMUNICATION OF A RELAY-OFF DEVICE FOR WIRELESS COMMUNICATION WITH A BASIC STATION AND TERMINAL
KR20050110267A (en) Method for acquiring syncronization in relay of time division duplexing procedure and apparatus
JP2000253446A (en) Base station device and frame synchronization acquiring method
KR20040004261A (en) Repeating method and apparatus for TDD(Time Division Duplex) wireless communication
US20080137561A1 (en) Rf repeater used for time division duplexing and method thereof
KR100788872B1 (en) TDD RF repeater using separation of transmitting and receiving antennas
JPH07131401A (en) Radio repeating installation
WO2002025837A3 (en) Method and apparatus for determining an operating condition in a communications system using antenna arrays
KR100690112B1 (en) Relaying apparatus and method of time division duplexing type relay
JP3419750B2 (en) Automatic repeater for mobile radio communication
CA2362766A1 (en) Data transmission method and radio link system
KR200396927Y1 (en) GPS TDD RF Repeater
KR101589387B1 (en) Interference cancellation repeater based on time division
KR100642248B1 (en) Time Division Duplexing RF System
KR100690325B1 (en) Apparatus And Method For Controlling Bias Of Power Amplifier Using Repeater And Base Station Of Time Division Duplex Type Portable Internet System
KR20040108468A (en) Method and device for attaining synchronization from base station signals in time division duplex system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS TO RULE 112(1) EPC DATED 18.04.2008

122 Ep: pct application non-entry in european phase

Ref document number: 06769000

Country of ref document: EP

Kind code of ref document: A1