WO2015165223A1 - Procédé et dispositif de transfert gsm souple - Google Patents

Procédé et dispositif de transfert gsm souple Download PDF

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Publication number
WO2015165223A1
WO2015165223A1 PCT/CN2014/089226 CN2014089226W WO2015165223A1 WO 2015165223 A1 WO2015165223 A1 WO 2015165223A1 CN 2014089226 W CN2014089226 W CN 2014089226W WO 2015165223 A1 WO2015165223 A1 WO 2015165223A1
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WO
WIPO (PCT)
Prior art keywords
target cell
mobile station
frequency point
cell
uplink signal
Prior art date
Application number
PCT/CN2014/089226
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English (en)
Chinese (zh)
Inventor
汪奇
程严
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中兴通讯股份有限公司
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Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2015165223A1 publication Critical patent/WO2015165223A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a global mobile communication system (Global System For Mobile Communications, GSM for short) soft handover method and apparatus.
  • GSM Global System For Mobile Communications
  • Soft Hand-off Refers to channel switching between cells when the carrier frequency of the pilot channel is the same.
  • the mobile subscriber maintains a communication link with both the original base station and the new base station, and only when the mobile station establishes stable communication in the new cell, disconnects from the original base station. It belongs to the unique switching function of the Code Division Multiple Access (CDMA) communication information system, which can effectively improve the switching reliability.
  • CDMA Code Division Multiple Access
  • More Softer Hand-Off Switching between two different signals in the Base Transceiver Station (BTS) is called softer handover. Whether soft switching or softer switching, it is to achieve the continuity of the mobile service to improve the user's subjective satisfaction. The difference between hard switching and soft switching: soft switching is first cut and then broken, hard switching is first broken and then cut.
  • the GSM system must switch between frequencies when switching, disconnect the link from the original frequency point, and then establish a link with the new frequency point, that is, the hard handover corresponding to the CDMA system. This causes problems of switching off calls and switching breaks.
  • the embodiment of the invention provides a method and a device for GSM soft handover, so as to at least solve the problem of switching dropped calls and switching breaks in the related art.
  • a method for GSM soft handoff comprising the steps of:
  • the frequency point currently used by the mobile station is a frequency point in the frequency resource pool used by the target cell
  • the switching is performed by activating the same time slot on the frequency point.
  • the activating the same time slot on the frequency point comprises:
  • the uplink receiving of the target cell is started, and the baseband processing of the target cell and the current cell are independent of each other;
  • the target cell normally receives the uplink signal sent by the mobile station, the downlink power of the target cell is turned on.
  • the switching by activating the same time slot on the frequency point comprises:
  • performing the handover includes:
  • the target cell normally receives the uplink signal sent by the mobile station, the downlink power of the target cell is turned on;
  • the target cell normally transmits the downlink signal to the mobile station by using the turned-down downlink power
  • the mobile station is handed over from the current cell to the target cell.
  • the downlink power of the target cell is turned on
  • the downlink power of the current cell is simultaneously turned off.
  • an apparatus for GSM soft handover including:
  • a determining module configured to determine whether the mobile station moves to a coverage area where the current cell overlaps with the target cell, and when determining that the mobile station moves to a coverage area where the current cell overlaps with the target cell, determining a frequency currently used by the mobile station Whether the point is the frequency point in the frequency resource pool used by the target cell;
  • the switching module is configured to perform switching by activating the same time slot on the frequency point if it is determined that the frequency point currently used by the mobile station is a frequency point in the frequency sharing resource pool.
  • the activating the same time slot on the frequency point comprises:
  • the uplink receiving of the target cell is started, and the baseband processing of the target cell and the current cell are independent of each other;
  • the target cell normally receives the uplink signal sent by the mobile station, the downlink power of the target cell is turned on.
  • the switching module comprises:
  • a determining unit configured to determine whether the target cell normally receives an uplink signal sent by the mobile station
  • the handover processing unit is configured to: when it is determined that the target cell normally receives the uplink signal sent by the mobile station, perform handover, and when it is determined that the target cell cannot normally receive the uplink signal sent by the mobile station, Switch.
  • the switching processing unit comprises:
  • a handover subunit configured to: when the target cell normally transmits the downlink signal to the mobile station by using the turned-down downlink power, to switch the mobile station from the current cell to the target cell.
  • the downlink power of the target cell is turned on
  • the downlink power of the current cell is simultaneously turned off.
  • the same frequency resource is used for handover in the coverage overlapping area of different cells, so that the GSM soft handover has the useability, the occurrence of the handover call drop is reduced, and the user experience is improved, and the baseband resources are independent from each other.
  • FIG. 1 is a flow chart of a method for GSM soft handover provided by the present invention
  • FIG. 2 is a schematic diagram of a device for GSM soft handover provided by the present invention.
  • FIG. 3 is a schematic diagram of GSM soft handover provided by an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for GSM soft handover provided by the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step S101 determining whether the mobile station moves to a coverage area where the current cell overlaps with the target cell;
  • Step S102 When it is determined that the mobile station moves to the coverage area where the current cell overlaps with the target cell, it is determined whether the frequency point currently used by the mobile station is a frequency point in the frequency resource pool used by the target cell;
  • a set of frequency points is used as a frequency resource pool. These frequency points are extracted from the network plan and can be used by multiple cells.
  • Step S103 If it is determined that the frequency point currently used by the mobile station is a frequency point in the frequency sharing resource pool, the handover is performed by activating the same time slot on the frequency point.
  • the activating the same time slot on the frequency point includes: performing uplink receiving of the target cell, and baseband processing of the target cell and the current cell are independent of each other; when the target cell normally receives the uplink signal sent by the mobile station After that, the downlink power of the target cell is turned on. And when the downlink power of the target cell is turned on, the downlink power of the current cell is simultaneously turned off.
  • the performing the switching by activating the same time slot on the frequency point includes: determining whether the target cell normally receives an uplink signal sent by the mobile station; and determining that the target cell normally receives the mobile station to send When the uplink signal is received, the handover is performed; when it is determined that the target cell cannot normally receive the uplink signal sent by the mobile station, the handover is not performed. That is, when the target cell normally receives the uplink signal sent by the mobile station, the downlink power of the target cell is turned on; when the target cell uses the downlink power that is turned on, the downlink signal is normally sent to the When the mobile station moves, the mobile station is handed over from the current cell to the target cell.
  • the current cell and the target cell according to the present invention perform soft handover by using respective baseband resources.
  • FIG. 2 is a schematic diagram of a device for GSM soft handover provided by the present invention.
  • the method includes: a determining module 201, configured to determine whether a mobile station moves to a coverage area where a current cell overlaps with a target cell, and when When it is determined that the mobile station moves to the coverage area where the current cell overlaps with the target cell, it is determined whether the frequency point currently used by the mobile station is a frequency point in the frequency resource pool used by the target cell; and the switching module 202 is configured to determine The frequency point currently used by the mobile station is a frequency point in the frequency sharing resource pool, and the switching is performed by activating the same time slot on the frequency point.
  • the switching module includes: a determining unit, configured to determine whether the target cell normally receives an uplink signal sent by the mobile station; and the handover processing unit is configured to: when determining that the target cell normally receives the uplink sent by the mobile station When the signal is received, the handover is performed, and when it is determined that the target cell cannot normally receive the uplink signal sent by the mobile station, the handover is not performed.
  • the switching processing unit includes: activating a downlink power subunit, and setting, when the target cell normally receives an uplink signal sent by the mobile station, turning on downlink power of the target cell; and switching a subunit , set to be small when the target When the downlink transmission power is normally transmitted to the mobile station by using the downlink power that is turned on, the mobile station switches the mobile station from the current cell to the target cell.
  • the activating the same time slot on the frequency point includes: performing uplink receiving of the target cell, and baseband processing of the target cell and the current cell are independent of each other; when the target cell normally receives the uplink signal sent by the mobile station After that, the downlink power of the target cell is turned on. And when the downlink power of the target cell is turned on, the downlink power of the current cell is simultaneously turned off.
  • the base station subsystem first performs a handover decision, and then determines whether the currently used frequency point is the level of the intermediate frequency point of the frequency point pool, the neighboring area and the timing advance. (Timing Advance, abbreviated as TA) is appropriate, etc., if it is, soft switching is possible.
  • the soft handover execution process includes: activating the same time slot with the same frequency point in the target cell, first not turning on the downlink power, and only performing uplink reception, and when the uplink signal is normally received on the target channel, turning on the downlink of the target channel, The downlink power of the original channel is turned off. When the measurement report of the target channel shows that the downlink reception of the UE is normal, the original channel is released.
  • the soft handover failure process includes: activating the same time slot with the same frequency point in the target cell, and starting uplink reception. If the uplink signal cannot be decoded normally, the target cell channel is released, and the soft handover fails.
  • FIG. 3 is a schematic diagram of the GSM soft handover provided by the embodiment of the present invention.
  • the user equipment User Equipment, UE for short
  • the handover decision is triggered. If the cell A and the cell B share a frequency resource pool, the soft handover operation can be performed.
  • the two cells simultaneously use the time slot 1 of the frequency Freq 1 (imeslo 1, referred to as TS1) for uplink.
  • TS1 frequency Freq 1
  • the determining that the cell A and the cell B share a frequency resource pool includes: the frequency resource pool refers to a group of multiplexed channels, and the frequency resource pool is configured to each cell before the cell works, and the BSS can determine by checking the configuration. Whether cell A and cell B are configured with the same channel resource pool.
  • the GSM soft handover scheme is divided into two types: intra-station and inter-station.
  • the clock synchronization of each cell under the same site is more suitable for soft handover implementation.
  • Soft handover of different sites requires GPS clock and other auxiliary means.
  • the present invention performs soft handover similar to CDMA by using the same frequency resource in the coverage overlapping area of different cells, and determines whether soft handover can be performed according to the TA and level conditions used by the user in the original cell.
  • a time slot is activated in the target cell with the same frequency point, and the downlink power is not turned on first, and only uplink reception is performed.
  • the uplink signal is normally received on the target channel
  • the downlink of the target channel is turned on, and the original is closed.
  • the downlink power of the channel when the measurement report of the target channel shows that the downlink reception of the UE is normal, the original channel is released.
  • the present invention has the following technical effects:
  • the invention can effectively reduce the call drop, switch the break, improve the Mean Opinion Score (MOS) value, improve the user perception, the existing synchronous switching mode in the GSM system, and more convenient to realize the softness of the GSM. Switch function.
  • MOS Mean Opinion Score
  • a method and an apparatus for GSM soft handover provided by an embodiment of the present invention have the following beneficial effects: by using the same frequency resource for handover in a coverage overlapping area of different cells, the GSM soft handover is useful, The occurrence of switching dropped calls is reduced, and the user experience is improved, and the baseband resources are independent of each other, and the application scenario is expanded.

Abstract

L'invention concerne le domaine des technologies de communication sans fil. L'invention concerne un procédé et un dispositif de transfert GSM souple, consistant : à déterminer si une station mobile s'est déplacée dans la couverture chevauchante d'une cellule courante et d'une cellule cible ; puis, si tel est le cas, à déterminer si un point de fréquence utilisé à ce moment par la station mobile est le point de fréquence d'un groupe de ressources de point de fréquence utilisé par la cellule cible ; puis, s'il a été établi que le point de fréquence utilisé à ce moment par la station mobile est le point de fréquence du groupe de ressources partagées, à activer le même créneau temporel sur le point de fréquence pour la commutation. La présente invention met en oeuvre les mêmes ressources de fréquences pour la commutation dans la couverture chevauchante de différentes cellules afin d'améliorer la possibilité de mise en oeuvre du transfert GSM souple, ce qui réduit l'abandon d'appels pendant la commutation et améliore ainsi l'expérience utilisateur.
PCT/CN2014/089226 2014-04-30 2014-10-23 Procédé et dispositif de transfert gsm souple WO2015165223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410179135.9A CN105025540A (zh) 2014-04-30 2014-04-30 一种gsm软切换的方法及装置
CN201410179135.9 2014-04-30

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WO2015165223A1 true WO2015165223A1 (fr) 2015-11-05

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1251968A (zh) * 1998-10-20 2000-05-03 富士通株式会社 容纳更多数目的移动台的码分多址移动通信系统
US20030054823A1 (en) * 2001-09-14 2003-03-20 Sang-Ho Choi Method for performing a fast intra-PDSN soft handoff
WO2003036837A1 (fr) * 2001-10-19 2003-05-01 Linkair Communications, Inc. Procédé de transfert en synchronisation en cdma

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6611507B1 (en) * 1999-07-30 2003-08-26 Nokia Corporation System and method for effecting information transmission and soft handoff between frequency division duplex and time division duplex communications systems
CN1156185C (zh) * 2001-02-08 2004-06-30 华为技术有限公司 全球移动通信系统信道软切换的方法
KR100541876B1 (ko) * 2003-06-05 2006-01-10 한국전자통신연구원 직교 주파수 분할 다중 접속 셀룰러 시스템에서의핸드오버 방법 및 장치
CN101932042A (zh) * 2009-06-18 2010-12-29 大唐移动通信设备有限公司 一种小区切换的方法、设备和系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1251968A (zh) * 1998-10-20 2000-05-03 富士通株式会社 容纳更多数目的移动台的码分多址移动通信系统
US20030054823A1 (en) * 2001-09-14 2003-03-20 Sang-Ho Choi Method for performing a fast intra-PDSN soft handoff
WO2003036837A1 (fr) * 2001-10-19 2003-05-01 Linkair Communications, Inc. Procédé de transfert en synchronisation en cdma

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