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WO2011009366A1 - Procédé et système pour transfert synchronisé de cellule - Google Patents

Procédé et système pour transfert synchronisé de cellule Download PDF

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Publication number
WO2011009366A1
WO2011009366A1 PCT/CN2010/074693 CN2010074693W WO2011009366A1 WO 2011009366 A1 WO2011009366 A1 WO 2011009366A1 CN 2010074693 W CN2010074693 W CN 2010074693W WO 2011009366 A1 WO2011009366 A1 WO 2011009366A1
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WO
WIPO (PCT)
Prior art keywords
signal
cell
relay
base station
terminal
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2010/074693
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English (en)
Chinese (zh)
Inventor
王曼
朱昀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
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 ZTE Corp filed Critical ZTE Corp
Publication of WO2011009366A1 publication Critical patent/WO2011009366A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points

Definitions

  • the present invention relates to a cell handover technique in mobile communication, and more particularly to a method and system for cell synchronization handover of a communication system with a relay. Background technique
  • the repeater plays a big role in relaying wireless signals, extending wireless coverage, covering special terrain, deploying services, eliminating dead zones, and optimizing networks.
  • the main components of the repeater are the antenna (donor antenna and forwarding antenna), duplexer 11, low noise amplifier 12, filter 13 and power amplifier 14, which form a loop to the donor antenna.
  • the signal received from the base station is filtered and amplified, and the amplified signal is forwarded by the forwarding antenna to the next communication link.
  • the repeater station can be used to amplify the base station signal to achieve coverage of a larger area.
  • a repeater can be used to amplify signals in a specific direction to extend the wireless coverage area. Due to the low cost, flexible configuration and special functions of the repeater, it is widely used in many communication systems.
  • the repeater enhances the signal, if the station is always placed on the train, on the one hand, the signal sent by the base station is amplified by the repeater, which is equivalent to increasing the coverage of the base station and reducing the pressure of the terminal switching.
  • the communication between the repeater and the terminal is relatively static, and no Doppler shift is generated, so that the communication quality can be ensured.
  • the solution using the repeater can combat the deterioration of communication quality in high-speed scenes.
  • the repeater solution can amplify the signal of the base station and optimize the communication quality in the high-speed scene, the solution also faces the problem of dropped calls during handover.
  • the main object of the present invention is to provide a method and system for cell synchronous handover to solve the call drop problem of the prior art switching in a high speed scenario.
  • the present invention provides a method for cell synchronous handover, the method comprising:
  • the relay relays the signal from the source base station of the current serving cell to the terminal, and then forwards the signal to the terminal;
  • the relay and the terminal detect the signal strength of the neighboring cell in the moving direction, and according to the detection result, when determining that the handover condition is met, the relay interrupts and the signal of the source base station are forwarded, and the signal from the target base station is forwarded.
  • the signal is relayed and forwarded to the terminal, and the terminal performs handover to the target base station.
  • the method further includes: the relay implementing synchronization with the base station based on the identification code identified from the signal transmitted from the base station.
  • the method further includes:
  • the relay detects a new flag code
  • the synchronization with the base station corresponding to the original flag code is interrupted according to the strength of the received signal, and the correspondence with the new flag code is maintained.
  • the method further includes: the relay and the terminal are strong and weak signals of the neighboring cell
  • the signal strengths of the pre-serving cells are compared. If the two are equal, and the signals of the neighboring cells are increasing, and the signal of the current serving cell is decreasing, it is determined that the switching conditions are met.
  • the detecting the signal strength of the neighboring cell in the moving direction specifically: determining the azimuth information and the moving direction of the mobile cell, and determining the neighboring cell in the moving direction according to the azimuth information in the signal from the neighboring cell, The signal strength of the neighboring cells in the moving direction is detected.
  • the method further includes: determining a position information and a direction of motion by a global positioning system (GPS).
  • GPS global positioning system
  • the present invention also provides a system for cell synchronous handover, the system comprising: a terminal and a relay, wherein
  • the relay is used to perform relay processing on the signal from the source base station of the current serving cell and then forward the signal to the terminal; and is also used to detect the signal strength of the neighboring cell in the moving direction, according to the detection result, When it is determined that the handover condition is met, the signal forwarding with the source base station is interrupted, and the signal from the target base station is relayed and then forwarded to the terminal;
  • the terminal is configured to receive a signal from the relay, and detect a signal strength of a neighboring cell in a motion direction, and perform handover to the target base station when determining that the handover condition is met according to the detection result.
  • the relay is further configured to implement synchronization with the base station based on the identification code identified from the signal transmitted from the base station.
  • the relay is further configured to: when detecting a new identifier code, interrupt synchronization with the base station corresponding to the original identifier according to the strength of the received signal, and maintain a correspondence with the new identifier.
  • the relay is further configured to compare the signal strength of the neighboring cell with the signal strength of the current serving cell, if the two are equal, and the signal of the neighboring cell increases, the signal of the current serving cell A decreasing trend is then determined to satisfy the switching condition.
  • the relay is further used to determine its own orientation information and direction of motion, and
  • the azimuth information in the signal of the neighboring cell determines the neighboring cell in the moving direction, and detects the signal strength of the neighboring cell in the moving direction.
  • a method and system for cell synchronous handover provided by the present invention, wherein a relay in a high-speed scenario and a terminal detect a signal strength of a neighboring cell in a moving direction, and according to the detection result, when it is determined that the handover condition is met, The relay interrupts the signal forwarding with the source base station, and relays the signal from the target base station to the terminal, and the terminal performs handover to the target base station.
  • the relay due to the enhancement effect of the relay on the signal, the coverage of the base station is increased, the pressure of the terminal handover is reduced, and the communication between the repeater and the terminal is relatively static, and no Doppler is generated. Le frequency shifting, thereby ensuring communication quality; on the other hand, ensuring that the relay and the terminal can perform cell handover synchronously, thereby solving the call drop problem of switching in a high speed scene.
  • FIG. 1 is a schematic structural view of a repeater in the prior art
  • FIG. 2 is a flowchart of a method for cell synchronous handover according to the present invention
  • FIG. 3 is a schematic diagram of cell handover in a high speed scenario according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a system for a cell synchronous handover according to the present invention.
  • FIG. 5 is a schematic structural diagram of a repeater of the present invention. detailed description
  • Two problems faced in high-speed scenarios One is the selection switching of the relay to the base station.
  • the antenna angle design of the conventional relay is fixed because the antenna coverage angle of the corresponding base station is also fixed.
  • the relay donor antenna is aligned with the antenna of the base station, the best relay effect can be ensured.
  • the base station corresponding to the relay changes continuously with the layout of the base station along the line, so the relay must judge which base station signal is better, and then receive the signal of the better base station.
  • the second is the handover between the terminal and the base station. The signal is sent from the base station.
  • the terminal After relaying and forwarding to the terminal, the terminal also needs to select an appropriate base station by handover.
  • the method for the cell synchronous handover provided by the present invention as shown in FIG. 2, mainly includes the following steps:
  • Step 201 The relay relays the signal from the source base station of the current serving cell to the terminal.
  • the relay receives the signal sent by the source base station of the current serving cell, relays the received signal to the terminal, and forwards the signal to the terminal.
  • the relay processing process is shown in FIG. Due to the enhancement of the signal by the relay, the coverage of the base station is increased, and the pressure of the terminal switching is reduced. On the other hand, the communication between the repeater and the terminal is relatively static, and no Doppler shift occurs. Can guarantee the quality of communication.
  • Step 202 The relay and the terminal detect a signal strength of a neighboring cell in a moving direction.
  • the relay and the terminal can first determine their own azimuth information and motion direction through a Global Positioning System (GPS), and determine neighboring cells in the motion direction according to the azimuth information in the signals from the neighboring cells, and then move the motion.
  • GPS Global Positioning System
  • the signal strength of neighboring cells in the direction is detected.
  • the cells are distributed along the railway in a single trend. For the relay and the terminal, there is only one adjacent cell in the direction of motion;
  • the network where the system is located is a public network along the high-speed rail, there may not be only one adjacent cell in the direction of motion, which may be one or more.
  • the relay and the terminal will detect the signal strength of each cell in the cell family in this direction of motion.
  • Determining whether it is a cell in the direction of motion detecting a change trend of the two orientation information of the relay or the terminal in a certain period of time, and comparing the orientation information in the signal of a certain starting point and the obtained neighboring cell, such as the same trend Then, it can be judged as a cell in the direction of motion.
  • Step 203 According to the detection result, when it is determined that the handover condition is met, the relay interrupts the signal forwarding with the source base station, and the signal from the target base station is relayed and then forwarded to the terminal, and finally The terminal performs handover to the target base station.
  • the application of the relay in the high-speed scene extends the coverage of the base station, but the switching of this relay destroys the existing network rules, causing overlapping of adjacent areas and increasing multipath interference.
  • the coverage area of the relay may overlap with other cells to generate the same frequency and adjacent frequency interference.
  • the relay selects the corresponding base station according to the known scrambling code information, relays the interrupt and the signal forwarding of the source base station at the cell boundary, and relays the signal from the target base station to the terminal; and relays the downlink flag to the base station.
  • the code also called the scrambling code, the cell identifier code, the synchronization code
  • the downlink identity code of the marker cell is transmitted in the downlink pilot time slot, and the base station transmits it in all directions of the cell.
  • this code is called a SYNC-DL code
  • the entire TD system has 32 sets of basic SYNC-DLs of length 64, each SYNC-DL marking one base station and one corresponding code group.
  • the relay After receiving the signal sent by the base station, the relay first down-converts the signal coupled from the base station, then performs digital demodulation through the high-speed AD, and finds the downlink synchronization code through the correlation algorithm, so as to reach the base station. When the two cell signal overlap area is at the boundary of the two cells, the relay strips out two sets of downlink synchronization codes.
  • the downlink synchronization code is removed from the codebook, and corresponds to a new downlink synchronization code, that is, a corresponding relationship with the next base station.
  • the relay and the terminal compare the signal strength of the neighboring cell with the signal strength of the current serving cell. If the two are equal, and the signal of the neighboring cell increases, the signal of the current serving cell decreases, then Determining that the switching condition is satisfied; thus, the terminal performs to satisfy the switching condition
  • the handover of the target base station, the relay interrupts the signal forwarding with the source base station, and receives the signal from the target base station, and relays the processing to the terminal. For example: As shown in Figure 3, the train moves at a high speed along the direction of the base station BS1 to the base station BS2. Since the direction of motion of the train is fixed, it will gradually move away from BS1 and close to BS2. The signal sent by BS1 is detected by PI and BS2.
  • the signal is P2.
  • P2 gradually approaches P1, it is the sign of entering the handover.
  • the signal is forwarded with the BS1, and the signal sent by the BS2 is started to be received, and the terminal and the BS2 perform the signaling interaction of the handover to achieve the purpose of smooth handover.
  • the train travels to the next cell boundary, the same switching operation as described above is repeatedly performed.
  • the present invention further provides a system for cell synchronous handover.
  • the system includes: a relay 10 and a terminal 20.
  • the relay 10 is configured to perform relay processing on the signal from the source base station of the current serving cell, and then forward the signal to the terminal 20.
  • the signal is also used to detect the signal strength of the neighboring cell in the moving direction, and is determined according to the detection result.
  • the terminal 20 is configured to receive a signal from the relay 10, and detect a signal strength of a neighboring cell in a moving direction, and perform handover to the target base station when determining that the handover condition is satisfied according to the detection result.
  • the relay 10 is further configured to: identify a flag code from a signal sent by the base station, and implement synchronization with the base station according to the flag code; when detecting a new flag code, interrupt and according to the strength of the received signal
  • the original flag code corresponds to the synchronization of the base station, and maintains the correspondence with the next base station.
  • the relay 10 is further configured to compare the signal strength of the neighboring cell with the signal strength of the current serving cell. If the two are equal, and the signal of the neighboring cell increases, the signal of the current serving cell decreases. Trend, then determine to meet the switching conditions.
  • the relay 10 is further configured to determine its own azimuth information and a moving direction, and determine neighboring cells in the moving direction according to the azimuth information in the signals from the neighboring cells, adjacent to the moving direction. The signal strength of the cell is detected.
  • the cell handover method of the present invention can be applied to various types of relays, such as: a repeater, a wireless backhaul BS, and the like.
  • a repeater as an example, as shown in FIG. 5, in order to implement the above method of cell handover, the repeater needs to add a control to the original duplexer 11, the low noise amplifier 12, the filter 13, and the power amplifier 14.
  • the controller 15 controls the function of performing signal strength detection, base station selection, and the like of the relay 10 shown in FIG. 4 by the controller 15.

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

Abstract

La présente invention porte sur un procédé de transfert synchronisé de cellule, comprenant les opérations suivantes : un relais exécute un traitement de relais sur les signaux à partir d'une station de base source (BS) de la cellule de desserte actuelle, puis transfère les signaux traités à un terminal; le relais et le terminal exécutent une détection de l'intensité de signal de la cellule voisine dans la direction de déplacement; selon le résultat de détection, lorsqu'on considère que la condition de transfert est satisfaite, le relais interrompt le signal en cours de transfert avec la station de base source, exécute un traitement de relais sur les signaux à partir d'une station de base cible, puis transfère les signaux traités au terminal et le terminal effectue un transfert à la station de base cible. La présente invention porte également sur un système de transfert synchronisé de cellule. Le procédé et le système de la présente invention résolvent le problème d'abandon d'appel de l'état de la technique, qui se produit lorsque le terminal effectue un transfert de cellule dans une scène à vitesse élevée.
PCT/CN2010/074693 2009-07-23 2010-06-29 Procédé et système pour transfert synchronisé de cellule Ceased WO2011009366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200910089784.9 2009-07-23
CN200910089784.9A CN101965027B (zh) 2009-07-23 2009-07-23 一种小区同步切换的方法和系统

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WO2011009366A1 true WO2011009366A1 (fr) 2011-01-27

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WO2013010393A1 (fr) * 2011-07-21 2013-01-24 中兴通讯股份有限公司 Procédé et système pour nœud relais pour gérer un équipement utilisateur lors de l'interruption d'une liaison de retour

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KR101995293B1 (ko) * 2011-02-21 2019-07-02 삼성전자 주식회사 반송파 집적 기술을 사용하는 시분할 무선통신시스템에서 부차반송파의 활성화 또는 비활성화 방법 및 장치
CN102158920A (zh) * 2011-05-13 2011-08-17 新邮通信设备有限公司 一种切换基站时目标基站的选择方法及基站
CN102843716B (zh) * 2011-06-24 2015-11-25 中国移动通信集团公司 一种移动中继网络中的切换方法、系统和设备
CN103179609A (zh) * 2011-12-20 2013-06-26 中兴通讯股份有限公司 一种邻区选择的方法及系统
CN103249098A (zh) * 2012-02-03 2013-08-14 上海贝尔股份有限公司 一种移动中继自决定小区切换的方法
CN110580056A (zh) * 2019-09-23 2019-12-17 深圳大漠大智控技术有限公司 差分信号发射装置及增大差分无人机集群稳定飞行的方法
CN113825183B (zh) * 2020-06-19 2025-06-17 展讯通信（上海）有限公司 通信方法及装置
CN115396963B (zh) * 2021-05-25 2025-03-14 维沃移动通信有限公司 切换方法、装置和网络侧设备

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CN101965027A (zh) 2011-02-02

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