WO2009039757A1 - Procédé et appareil pour mettre en œuvre un transfert avec coupure dans une zone frontalière - Google Patents

Procédé et appareil pour mettre en œuvre un transfert avec coupure dans une zone frontalière Download PDF

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Publication number
WO2009039757A1
WO2009039757A1 PCT/CN2008/072305 CN2008072305W WO2009039757A1 WO 2009039757 A1 WO2009039757 A1 WO 2009039757A1 CN 2008072305 W CN2008072305 W CN 2008072305W WO 2009039757 A1 WO2009039757 A1 WO 2009039757A1
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WO
WIPO (PCT)
Prior art keywords
carrier frequency
bsc
mobile terminal
handover
frequency
Prior art date
Application number
PCT/CN2008/072305
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English (en)
Chinese (zh)
Inventor
Haofeng Qi
Yayong Chen
Yaobing Wang
Yunjuan Xie
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009039757A1 publication Critical patent/WO2009039757A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for implementing hard handover of a border area. Background technique
  • Soft handoff is generally possible between two intra-frequency cells within the base station controller (BSC).
  • BSC base station controller
  • the A3/A7 interface between the BSCs ensures that the intra-frequency neighbors between different BSCs can be soft-switched.
  • cell switching between BSCs of different manufacturers generally adopts the same frequency hard switching mode.
  • Hard Handoff (HHO) refers to the way in which the connection to the old traffic channel is disconnected before establishing a connection with the new service channel. For example, there is no A3/A7 interface between BSC1 and BSC2.
  • the same-frequency cell that is switched from the cell of the BSC1 to the BSC2 cannot implement the soft handover.
  • it can be configured to perform the same-frequency hard handover, and cut the pilot of the target BSC2 in a hard handover manner.
  • the embodiment of the invention provides a method and a device for implementing hard handover in a border area, which can reduce ping-pong switching which is relatively easy to occur in a hard handover process of a border cell of a heterogeneous vendor BSC.
  • the method for implementing hard handover of a boundary area includes:
  • Another embodiment of the present invention further discloses a method for implementing hard handover of a border area, where the method includes: when a mobile terminal on a basic carrier frequency of a second BSC border cell moves from a basic carrier frequency coverage area of a second BSC boundary cell When the basic carrier frequency coverage area of the first BSC boundary cell moves, it is determined whether the preset second handover condition is met, and if yes, the inter-frequency hard handover is performed, and the mobile terminal is switched to the frequency and basic provided by the first BSC.
  • the transition carrier frequency of the carrier carrier is different, and the coverage of the transition carrier frequency is at least greater than the coverage of the basic carrier frequency of the first BSC boundary cell.
  • the present invention also discloses a base station controller (BSC) capable of realizing hard handover of a border area, and includes the following modules:
  • a transition carrier frequency module configured to set a transition carrier frequency different from a basic carrier frequency, and the coverage of the transition carrier frequency is greater than a coverage of the basic carrier frequency
  • the hard handover module is configured to determine whether the mobile terminal in the basic carrier coverage area of the BSC meets a handover condition for switching to a transition carrier frequency, and if yes, to switch the mobile terminal to the transition carrier frequency.
  • the transition carrier frequency provided by the first BSC is configured as a hard handover target of the first BSC basic carrier frequency or the second BSC basic carrier frequency, and the transition carrier frequency is completely free of co-channel interference, and the pilot strength is used.
  • the good feature can reduce the ping-pong switching that is more likely to occur during the hard handover process of the border cell of the hetero-vendor BSC.
  • Figure 1 is a schematic diagram of the boundary formed between BSCs of different manufacturers
  • FIG. 2 is a schematic diagram of a transition carrier and a basic carrier coverage according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a handover of a mobile terminal from a BSC1 coverage area to a BSC2 coverage area according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a handover of a mobile terminal from a coverage area of a BSC2 to a coverage area of a BSC1 according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an algorithm for implementing handover of a mobile terminal from a transition carrier frequency to a basic carrier frequency according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an algorithm implementation of a load control hard handover of a mobile terminal from a basic carrier frequency of a BSC1 to a transition carrier frequency according to an embodiment of the invention
  • FIG. 7 is a schematic diagram of an algorithm implementation of a load control hard handover of a mobile terminal from a basic carrier frequency of a BSC2 to a transition carrier frequency according to an embodiment of the invention
  • FIG. 8 is a schematic diagram of an algorithm implementation of load control hard handover of a mobile terminal from a transition carrier frequency to a basic carrier frequency of a BSC according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of an algorithm for performing load control hard handover from a transition carrier frequency to a basic carrier frequency of a BSC1 according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a BSC1 for implementing hard handover according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention is directed to the boundary of the currently incompatible BSC (mainly the A3/A7 interface between the BSCs cannot be docked) (transient boundary, or the steady state boundary under the permission of the resource), and the switching success rate is low, which is difficult. It is necessary to cooperate with many problems, and a transition carrier frequency solution with high switching success rate, easy implementation of the single-sheet, and less cooperation between the two parties is given. In this program, just The primary party provides a wide enough transition carrier frequency in the BSC boundary area of both parties, and uses the transition carrier frequency to achieve hard handover between incompatible BSCs. Incompatible BSCs are usually BSCs produced by different vendors.
  • BSC1 has the basic carrier frequency of the cell: carrier frequency F1 and carrier frequency F2; BSC2 also has the basic carrier frequency of the cell: carrier frequency F1 and carrier frequency F2. BSC1 also provides another transition carrier frequency F3. The frequency of the carrier frequency is different from the frequency of the existing basic carrier frequency and will not be interfered by the basic carrier frequencies of BSC1 and BSC2, so it can be in the boundary area between BSC1 and BSC2. Cover a transition strip that is wide enough.
  • BSC1 is called a dominant BSC
  • BSC2 is an existing BSC, which is called a cooperative BSC.
  • the resident strategy of the mobile terminal idle state is as follows:
  • the mobile terminal in the idle state can adopt the prior art resident strategy in the cell of the BSC2.
  • the basic carrier frequencies F1 and F2 are camped through the hash (HASH) mode or any other idle state, and do not reside in the transition carrier frequency F3.
  • the cells in the border area of the two parties can complete the idle state handover by mutually configuring the other party as an idle neighboring area.
  • the access policy of the mobile terminal is as follows:
  • the mobile terminal can adopt the prior art access strategy in the cell of the BSC2 and the non-boundary cell of the BSC1;
  • the mobile terminal in the BSC1 border cell only allows it to access on the basic carrier frequency, does not allow it to access on the transition carrier frequency, and is not allowed to be assigned to the transition carrier frequency.
  • the service state switching strategy of the mobile terminal in the border area includes the following aspects:
  • the pseudo-pilot hard handover When the mobile terminal moves from the border cell of the BSC1 to the border cell of the BSC2, the pseudo-pilot hard handover, the Handdown hard handover, the inter-frequency neighbor search hard handover, and the direct hard handover may be used to switch to F3. Due to the good pilot strength of F3 and wide coverage, the success rate must be very high.
  • the handover process of pseudo pilot hard handover is implemented as follows:
  • the BSC2 boundary cell base carrier is configured in the system as an external pseudo pilot of BSC1, and the pseudo pilot target is configured as a transition carrier frequency.
  • the pseudo pilot hard switch of the basic carrier frequency of the BSCl boundary cell is turned on and the corresponding hard handover parameter is configured.
  • the BSC1 receives the handover request from the BSC2 to the basic carrier hard handover of the border cell, and instructs the mobile terminal to switch to the transition carrier frequency F3 of the BSC1. Since F3 has good pilot strength and wide coverage, this handover success rate is high and ping-pong switching does not occur.
  • the inter-frequency hard handover triggered by the RTD and the pilot strength or the inter-frequency neighbor search may be used to switch to the boundary carrier F3 of the boundary cell configuration of the BSC1.
  • the intra-cell inter-frequency hard handover (Handdown) or the inter-frequency neighbor search hard handover triggered by the loop delay (RTD) combined with the pilot strength (Eclo) may be employed.
  • the transition carrier frequency F3 does not carry too much traffic. If the load on the transition carrier frequency is not high and the user mobility is not too large, it may be considered not to the basic carrier. Do the switching.
  • F3 In order to ensure the wide coverage characteristics of the F3 carrier, the load on F3 must be controlled.
  • F3 only acts as a handover carrier to bear the handover traffic, and the mobile terminal is not allowed to access on the carrier frequency F3.
  • an algorithm can be used to control the switching behavior of the mobile terminal, and reduce traffic on the transition carrier frequency. At least one of the following methods is included:
  • the load-control algorithm of the transition carrier frequency is used to switch to the basic carrier frequency of the BSC2 in the edge region covered by F3, the switching success rate is high, and the transition carrier load can be reduced.
  • the user on the transition carrier frequency F3 can also switch to the basic carrier frequency through other switching methods, such as inter-frequency neighbor search hard switching or other hard switching modes;
  • RTD_NEAR The RTD threshold that triggers a hard handoff at a near point
  • RTD_FAR RTD threshold that triggers hard handover from a far point
  • the RTD_NEAR is smaller than the RTD_FAR. If the current RTD of the mobile terminal is less than or equal to the RTD_NEAR, the terminal is located in the area closer to the base station; if the current RTD of the mobile terminal is greater than or equal to the RTD_FAR, The terminal is located in the area i or far from the base station.
  • EcIo_NEAR The Eclo threshold that triggers a hard handoff at a near point
  • EcIo_FAR Eclo threshold that triggers hard handoff from a far point; The above two thresholds are related to the signal strength of the carrier frequency. Generally, EcIo_NEAR is greater than EcIo_FAR. If the current Eclo of the mobile terminal is greater than or equal to EcIo_NEAR, it indicates that the signal of the mobile terminal is strong; if the current Eclo of the mobile terminal is less than or equal to EcIo_FAR , indicating that the signal in the area where the mobile terminal is located is weak.
  • RTD current loop delay of the mobile terminal
  • Eclo The current pilot strength of the mobile terminal.
  • the source carrier frequency (transition carrier frequency) is switched to the target carrier frequency (the basic carrier frequency of the BSC2);
  • the source carrier frequency (transition carrier frequency) is switched to the target carrier frequency (basic carrier frequency of BSC1).
  • the trigger diagram of the transition carrier frequency load control algorithm is shown in Figure 5.
  • the mobile terminal on the transition carrier frequency can be switched to the basic carrier frequency in time by the above algorithm, thereby effectively alleviating the load on the transition carrier frequency.
  • the parameters for the basic carrier frequency can also be flexibly set according to the above algorithm, so that the mobile terminal on the basic carrier frequency can switch to the transition carrier frequency in time to avoid the same frequency switching.
  • the parameters set for the basic carrier frequency include:
  • RTD load control hard handover algorithm
  • EcIo_NEAR 0
  • RTD_FAR and EcIo_FAR are set according to actual conditions to ensure the movement of the BSC1 boundary cell.
  • the terminal moves to the cell coverage area of the BSC1 until the actual loop delay RTD is greater than or equal to RTD_FAR and/or the actual pilot strength Eclo is less than or equal to EcIo_FAR, the mobile terminal switches to the transition carrier frequency.
  • the load control hard handover algorithm is started at the transition carrier frequency, and the handover target and handover parameters of the transition carrier frequency are configured, and when the mobile terminal on the transition carrier frequency moves to the boundary cell of the BSC2, the transition to the transition carrier is performed.
  • the system instructs the mobile terminal to switch to the basic carrier frequency of the BSC2 cell by determining that the actual loop delay RTD is greater than or equal to RTD_FAR and/or the actual pilot strength Eclo is less than or equal to EcIo_FAR.
  • the system determines that the actual loop delay RTD that satisfies the transition carrier frequency is less than or equal to RTD_NEAR and/or the actual pilot strength Eclo is greater than or equal to EcIo_NEAR, indicating that the mobile terminal switches to the basic carrier frequency of BSC1.
  • the parameter configuration of the transition carrier frequency should satisfy the following relationship:
  • RTD_NEAR Transition Carrier Frequency
  • RTD_FAR Base Carrier Frequency
  • the above-mentioned load control hard handover algorithm is only a feasible hard handover scheme when it is necessary to reduce the transient carrier frequency load, and is not the only hard handover scheme.
  • a hard handover of an inter-frequency neighbor search may also be used when switching from a transition carrier frequency to a basic carrier frequency of the BSC2.
  • the transition from the basic carrier frequency of the BSC1 to the BSC1 carrier frequency switching using the above-mentioned load control hard handover algorithm is only an alternative, for example, pseudo pilot hard handover, hard handover of different frequency neighbor search, direct Hard switching, etc.
  • the transition from the basic carrier frequency of the BSC2 to the BSC1 carrier frequency switching using the above-mentioned load control hard handover algorithm is only an alternative.
  • the most simple solution is to directly configure the basic carrier frequency between BSC2 and BSC1.
  • BSC1 directs it to switch to the transition carrier of BSC1.
  • pseudo-pilot hard handover, hard handover of inter-frequency neighbor search, and direct hard handover are optional hard handover algorithms.
  • the embodiment of the present invention utilizes the characteristics that the transition carrier frequency has no co-channel interference, the pilot strength is good, and the coverage is wide, and the ping-pong switching which is relatively easy to occur in the hard-switching process of the border cell of the different vendor BSC is reduced, and the device can be set. Quick optimization or no optimization is required, and the other party needs to cooperate less.
  • the BSC1 for implementing the solution of the embodiment of the present invention includes the following modules: a transition carrier module 1010, configured to set a transition carrier frequency different from a basic carrier frequency, and the transition carrier frequency The coverage is greater than the coverage of the basic carrier frequency;
  • the hard handover module 1020 is configured to determine whether the mobile terminal in the basic carrier coverage area of the BSC1 meets a handover condition for switching to the transition carrier frequency, and if yes, the mobile terminal is switched to the transition carrier module 1010. Transition carrier frequency; or determining whether the mobile terminal at the transition carrier frequency satisfies a condition for switching to a basic carrier frequency of the BSC1, and if so, switching the mobile terminal to a basic carrier frequency; or determining the transition Whether the mobile terminal of the carrier frequency satisfies the condition of switching to the basic carrier frequency of the adjacent BSC, and if so, instructs the mobile terminal to switch to the basic carrier frequency of the adjacent BSC.
  • the hard switching module 1020 includes:
  • a first switching unit 1021 configured to set an RTD_FAR and/or an EcIo_FAR of a basic carrier frequency of the BSC1, and determine whether an actual loop delay of the mobile terminal on the BSC basic carrier frequency is greater than or equal to the RTD_FAR, and/or Whether the actual pilot strength of the mobile terminal is less than or equal to the EcIo_FAR, and if yes, instructing the mobile terminal to perform an inter-frequency hard handover to the transition carrier frequency.
  • the second switching unit 1022 is configured to set the RTD_NEAR and/or EcIo_NEAR of the transition carrier frequency, and determine whether the actual loop delay of the mobile terminal on the transition carrier frequency is less than or equal to RTD_NEAR, and/or determine the transition carrier frequency.
  • the second switching unit further setting the RTD_FAR of the transition carrier frequency and / or EcIo_FAR, and judge Whether the actual loop delay of the mobile terminal on the transition carrier frequency is greater than or equal to RTD_FAR, and/or determining whether the actual pilot strength of the mobile terminal on the transition carrier frequency is less than or equal to EcIo_FAR, and if yes, indicating the mobile terminal Performing an inter-frequency hard handover, switching to the basic carrier frequency of the adjacent BSC 2 of the BSC1.
  • the transition carrier module 1010 further includes:
  • the transition carrier frequency information sending unit 1011 is configured to: when the neighboring vendor BSC2 initiates a hard handover to the BSC1, the BSC1 allocates resources on the transition carrier frequency, and feeds back the transition carrier frequency as the target carrier frequency through the handover request response message. Describe the manufacturer BSC. In this way, the heterogeneous BSC can preferentially switch the mobile terminal to the transition carrier frequency.
  • the adjacent BSC2 of the BSC1 also has the same structure and function as the BSC1, and can implement the handover of the mobile terminal in the BSC2 to the adjacent BSC of the BSC2.
  • the solution of the embodiment of the present invention requires less cooperation from different vendors, and most of the configurations are completed in the single-side BSC device:
  • the other party only needs to configure the same-frequency hard-switching relationship with the same single-chip, and there is no other matching requirement.
  • With the transition carrier frequency there is no co-channel interference at all, and the pilot strength is good.
  • Only the other side BSC supports the hardest single hard handover algorithm, which can improve the hard handover success rate of the BSC boundary.
  • the solution of the present invention utilizes the wide coverage characteristic of the transition carrier frequency, and reduces the situation that the conventional intra-frequency hard handover region is prone to ping-pong hard handover, and the handover success rate is unstable.

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

Abstract

L'invention porte sur un procédé et un appareil pour mettre en ouvre un transfert avec coupure dans une zone frontalière, le procédé comprenant les opérations suivantes : lorsqu'un terminal mobile qui est sur une fréquence de base de la cellule de bordure du premier contrôleur de station de base (BSC) se déplace de la zone de couverture de la fréquence de base de la cellule de bordure du premier BSC vers la zone de couverture de fréquence de base de la cellule de bordure du second BSC, déterminer si une première condition de transfert prédéterminée est satisfaite ou non, si la première condition de transfert prédéterminée est satisfaite, alors effectuer un transfert avec coupure interfréquence et transférer le terminal mobile à une fréquence provisoire fournie par le premier BSC qui est différente de la fréquence de base du premier BSC. Un autre procédé pour mettre en œuvre un transfert avec coupure dans une zone frontalière et un BSC capable de mettre en œuvre un transfert avec coupure dans une zone frontalière sont aussi décrits. La présente invention emploie la caractéristique de couverture large de la fréquence provisoire et évite le phénomène de transfert avec coupure en ping-pong qui se produit facilement dans une zone de transfert avec coupure intra-fréquence.
PCT/CN2008/072305 2007-09-20 2008-09-09 Procédé et appareil pour mettre en œuvre un transfert avec coupure dans une zone frontalière WO2009039757A1 (fr)

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Application Number Priority Date Filing Date Title
CN 200710151929 CN101232713B (zh) 2007-09-20 2007-09-20 一种实现边界区域硬切换的方法和装置
CN200710151929.4 2007-09-20

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CN102118751A (zh) * 2011-01-18 2011-07-06 中兴通讯股份有限公司 一种载频分配方法和装置

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CN101232713B (zh) * 2007-09-20 2011-01-12 华为技术有限公司 一种实现边界区域硬切换的方法和装置
CN101686504B (zh) * 2008-09-22 2012-07-18 中兴通讯股份有限公司 一种控制测量恢复的方法
CN101790206B (zh) * 2009-01-22 2012-06-27 鼎桥通信技术有限公司 一种小区内切换的方法
CN102238595B (zh) * 2010-04-30 2014-02-26 华为技术有限公司 小区失效的处理方法及其设备
CN103026759B (zh) * 2011-07-27 2016-03-30 华为技术有限公司 一种切换的方法和相关装置及通信系统
CN103686892A (zh) * 2012-09-20 2014-03-26 中国移动通信集团公司 一种小区重选方法、系统及终端、基站
CN114079523A (zh) 2020-08-17 2022-02-22 艾锐势企业有限责任公司 用于切换用户终端的方法、装置和计算机介质以及接入点

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WO1998027776A2 (fr) * 1996-12-17 1998-06-25 Northern Telecom Limited Procede de transfert 'impose' dans un amcr
CN1213942A (zh) * 1997-08-22 1999-04-14 三星电子株式会社 用多个共同频率的半软切换方法和系统
CN1221304A (zh) * 1997-12-26 1999-06-30 三星电子株式会社 码分多址蜂窝系统中小区内频率间硬切换的方法
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