USRE43243E1 - Method for controlling an intersystem handover - Google Patents

Method for controlling an intersystem handover Download PDF

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Publication number
USRE43243E1
USRE43243E1 US12/457,810 US45781001A USRE43243E US RE43243 E1 USRE43243 E1 US RE43243E1 US 45781001 A US45781001 A US 45781001A US RE43243 E USRE43243 E US RE43243E
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Prior art keywords
transport format
radio communication
communication system
channel
signaling
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US12/457,810
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English (en)
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Michael Faerber
Kenneth Isaacs
David Wynne Thomas
Jean-Michel Traynard
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Siemens AG
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Siemens AG
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    • 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
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

Definitions

  • the invention relates to a method for the control of an intersystem handover, in particular the handover between a GSM- and a UMTS mobile radio system.
  • radio communication systems for example the European mobile radio system of the second generation GSM (Global System for Mobile Communications)
  • information such as speech, image information or other data are transmitted by electromagnetic waves over a radio interface.
  • the radio interface one or more connections are set up between a base station and plural subscriber stations; the subscriber stations can be, for example, mobile stations or stationary radio stations.
  • the radiation of the electromagnetic waves takes place at carrier frequencies which are situated in a frequency band provided for the respective system.
  • the UMTS Universal Mobile Telecommunication System
  • frequencies in the frequency band of about 2,000 MHz are provided.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • CDMA Code Division Multiple Access
  • a subscriber station which have set up a connection in a radio communication system are to be given the possibility of handing the connection over to a further radio communication system, which as the case may be supports another transmission mode.
  • Such an intersystem handover assumes, besides a synchronization of the subscriber station with the radio communication system which is to take over the connection, the knowledge of the transport format used.
  • TFCS Transport Format Combination Set
  • a so-called Transport Format Combination Identifier TFCI is subsequently signaled to the subscriber station, and states which transport format is used out of the set of possible transport format combinations.
  • the signaling of the set of transport format combinations TFCS would have a length of up to 200 8-bit bytes, depending on the number of possible TFCIs in a known GSM signaling channel. This length is very disadvantageous because of the only limited capacity available on the usable GSM signal channels.
  • the invention has as its object to propose a method or respectively a communication system station which makes possible a small loading of the signaling channel of at least one of the systems during the signaling of an intersystem handover.
  • the set of transport format combinations is reduced, and in the reduced form is used for transmission to a subscriber station on a signaling channel, for example, a GSM mobile radio system.
  • a signaling channel for example, a GSM mobile radio system.
  • the subscriber stations and corresponding network stations suitable for this method have a memory region with corresponding data.
  • FIG. 1 is a block circuit diagram of two neighboring radio communication systems, a subscriber station being situated in their overlapping radio cells.
  • two exemplary cases of a handover can be distinguished for a subscriber station in the region of two radio systems. It is assumed below that the handover is from a GSM to a UMTS mobile radio system, the implementation in the reverse direction also being possible in principle.
  • a service is requested by the subscriber station which cannot be made available by the GSM system or by a GSM transmission channel (so-called bearer).
  • bearer a GSM transmission channel
  • a first signaling channel SDCCH (Stand-Alone Dedicated Control Channel) is set up as an independent, fixedly allocatable control channel.
  • the transmission capacity of the SDCCH however appears insufficient for the transmission of the whole of the TFCS information, which in the present example can amount to up to 200 8-bit bytes.
  • no service is set up.
  • the problem is therefore solved according to the invention in that the handover is limited to a signaling channel.
  • a transport format indicator TFCI is used for the handover to the UMTS system over the GSM signaling channel GSM-SDCCH.
  • an a priori knowledge of the transport format indicator TFCI to be used must be present.
  • the negotiation over the service to be used can be concluded within the UMTS system, the transport format indicator TFCI being signaled to the subscriber station from the then completely available set of transport format combinations TFCS for the traffic channel within a so-called UMTS radio bearer configuration information.
  • a set of UMTS signaling channels can be defined. This enables access to the network by reduced signaling on these signaling channels.
  • the reduced signaling can be transmitted, for example, by a simple bitmap coding of 5 bits within a signaling channel SDCCH.
  • the advantage of the present state of the art according to Release 99 is that a handover of transmission channels with plural services and different qualities of service can be ignored on a GSM transmission channel; the concept of signaling by reduced data sets or counting of indicators can be expanded in the same manner to such procedures. Because of this, a complete flexibility in the TFCI coding within the signaling phase can be dispensed with.
  • the TFCI coding can be reduced to this required volume.
  • the selection is limited to a predefined list of possible TFCI, which represent the respectively possible combinations, instead of to the complete set of possible TFCI.
  • a coding of the combination possibilities can take place, as in the case first considered, by a bitmap coding of, for example, 7 bits.
  • the concept embraces a substitution of the complete TFCS signaling by a reduced set of combinations, which is known in both the subscriber station and the network.
  • the reduced signaling makes possible a first handover to a UMTS signaling and data channel, or to a UMTS signaling channel, which is subsequently used for passing on the connection setup or service setup, making use of the then completely available flexibility of the TFCI coding.
  • FIG. 1 shows, as a version of the first embodiment of the embodiment example, respective sections of two mobile radio systems RS 1 , RS 2 as an example of radio communication systems, e.g., a GSM and a UMTS mobile radio system.
  • a mobile radio system typically has numerous mobile switching centers MSC or UMSC (Mobile Switching Center or UMTS Mobile Switching Center), which belong to a switching network SSS (Switching SubSystem) and are networked together or produce the access to a fixed network, and of respectively one or more base station systems BSS (Base Station Subsystem) connected to these mobile switching centers MSC, UMSC.
  • MSC Mobile Switching Center or UMTS Mobile Switching Center
  • SSS Switching SubSystem
  • BSS Base Station Subsystem
  • a base station system BSS furthermore has at least one BSC (Base Station Controller) or RNC (Radio Network Controller) device for the allocation of radio-technical resources, and also at least one base station BTS (Base Transceiver Station) or NB (node B), respectively connected thereto.
  • BSC Base Station Controller
  • RNC Radio Network Controller
  • a base station BTS, NB can set up, over a radio interface, connections to subscriber stations UE (User Equipment), such as for example mobile stations or other mobile and stationary terminal devices.
  • Subscriber stations UE User Equipment
  • At least one radio cell is formed by each base station BTS, NB.
  • the size of the radio cell is as a rule determined by the range of a general signaling channel BCH (Beacon Channel) or BCCH (Broadcast Control Channel), which is transmitted from the base stations BTS, NB at a respectively higher transmitting power than that of the traffic channels.
  • BCH Beacon Channel
  • BCCH Broadcast Control Channel
  • FIG. 1 shows a subscriber station UE, which is embodied as a mobile station and which is situated in a coverage area, and also a first mobile radio system RS 1 which supports a UMTS standard, and in addition a second mobile radio system RS 2 ,which supports a GSM standard.
  • the subscriber station UE has set up a connection to the base station BTS, shown by way of example, of the second mobile radio system RS 2 .
  • the subscriber station UE periodically evaluates the transmission conditions of the radio interface to the base stations surrounding it, such as for example the indicated base station NB of the first mobile radio system RS 1 , in order, for example with a worsening of the transmission quality to the base station BTS of the second mobile radio system RS 2 , or with an additional setting up of a service, to instigate a handover to the base station NB of the first mobile radio station RS 1 .
  • the same method is also used, for example, with hierarchical network structures, when a connection is handed over between different hierarchy planes, for example, from a micro-cell to a macro-cell, which operate in respectively different frequency bands.
  • signal channels SIG.CH 1 or SIG.CH 2 are used as independent control channels which can be fixedly allocated, as has been described hereinabove in the context of the preferred signaling procedures.
  • the set of transport format combinations TFCS Transport Format Combination Set
  • TFCI Transport Format Combination Set
  • the subscriber station UE is connected to the GSM network RS 2 at a first time, then as explained hereinabove, the reduced set of transport format combinations TFCS is used for initiating a handover. After the setting up of a corresponding connection to the first communication system, the complete set of transport format combinations TFCS is used.
  • the signaling of the reduced information set can take place over different signaling channels, e.g., over the message control channel BCCH already existing for other control and signaling purposes.
  • the broadcasting of the reduced set of transport format combinations TFCS can thus in particular take place over the radio channel or message channel BCCH.
  • a dedicated transport format combination identifier TFCI is signaled and allocated, e.g., over the signaling channel SIG.CH, to the subscriber station UE, in common with the handover command.
  • This handover is to be capable of being performed in future radio communication systems, such as for example the UMTS mobile radio system, and also between radio communication systems which support different transmission methods. Further scenarios of the handover between like or different systems and transmission methods are conceivable.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Multiple Motors (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
  • Elevator Control (AREA)
  • Exchange Systems With Centralized Control (AREA)
US12/457,810 2000-03-06 2001-03-06 Method for controlling an intersystem handover Expired - Lifetime USRE43243E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/457,810 USRE43243E1 (en) 2000-03-06 2001-03-06 Method for controlling an intersystem handover

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP00301815 2000-03-06
EP00301815 2000-03-06
US12/457,810 USRE43243E1 (en) 2000-03-06 2001-03-06 Method for controlling an intersystem handover
US10/220,860 US6944453B2 (en) 2000-03-06 2001-03-06 Method for controlling an intersystem link transfer
PCT/EP2001/002508 WO2001067795A1 (fr) 2000-03-06 2001-03-06 Procede pour commander un transfert entre systemes

Related Parent Applications (1)

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US10/220,860 Reissue US6944453B2 (en) 2000-03-06 2001-03-06 Method for controlling an intersystem link transfer

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USRE43243E1 true USRE43243E1 (en) 2012-03-13

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US (2) US6944453B2 (fr)
EP (1) EP1262081B1 (fr)
JP (1) JP3673757B2 (fr)
KR (1) KR100524270B1 (fr)
CN (1) CN1418443B (fr)
AT (1) ATE277487T1 (fr)
AU (1) AU2001240680A1 (fr)
BR (1) BRPI0108975B1 (fr)
DE (1) DE50103757D1 (fr)
ES (1) ES2227149T3 (fr)
TR (1) TR200402765T4 (fr)
WO (1) WO2001067795A1 (fr)

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FI107220B (fi) * 1998-11-06 2001-06-15 Nokia Networks Oy Menetelmä kantajien ominaisuuksien hallitsemiseksi
WO2002080605A1 (fr) * 2001-03-30 2002-10-10 Nokia Corporation Procede pour assurer un transfert entre des reseaux d'acces radio
DE10117628A1 (de) * 2001-04-07 2002-10-10 Alcatel Sa Verfahren zum Betreiben eines funkbasierten Telekommunikationssystems
GB2377586B (en) * 2001-07-06 2005-06-29 Ipwireless Inc System and method for channel transport format allocation in a wireless communication system
US6845088B2 (en) * 2001-10-19 2005-01-18 Interdigital Technology Corporation System and method for fast dynamic link adaptation
KR100965670B1 (ko) * 2002-12-10 2010-06-24 삼성전자주식회사 이동통신시스템의 시스템간 셀 변경 방법
FR2850518B1 (fr) * 2003-01-29 2005-05-20 Evolium Sas Procede pour l'acces simultane a des services circuit et a des services paquet dans un systeme cellulaire de radiocommunications mobiles
CN100488315C (zh) * 2003-09-23 2009-05-13 中兴通讯股份有限公司 一种宽带码分多址系统传输格式组合集配置方法
CN100449975C (zh) * 2003-09-28 2009-01-07 华为技术有限公司 一种传输格式组合选择平滑处理方法
GB0326936D0 (en) * 2003-11-19 2003-12-24 Samsung Electronics Co Ltd Mobile communications
GB2413242B (en) * 2004-04-14 2006-07-12 Siemens Ag A method of optimising scheduling for a terminal in soft handover in a communication system
DE102004044957B4 (de) * 2004-09-16 2007-04-19 Infineon Technologies Ag Medium-Zugriffs-Steuerungs-Einheit, Mobilfunkeinrichtung und Verfahren zum Abbilden mittels einer Mobilfunkeinrichtung zu übertragender Daten
KR101119100B1 (ko) * 2005-01-03 2012-03-16 엘지전자 주식회사 데이터 블록 송수신 방법
CN101292446A (zh) 2005-10-31 2008-10-22 Lg电子株式会社 在无线移动通信系统中传输测量报告的方法
EP1955509A4 (fr) 2005-11-28 2011-07-06 Lg Electronics Inc Procede et appareil destines a generer et a transmettre une sequence de code dans un systeme de communication sans fil
DK2030394T3 (da) 2006-06-09 2014-10-27 Tq Lambda Llc Fremgangsmåde til transmission af data i et mobilkommunikationssystem
EP1876849A1 (fr) * 2006-07-06 2008-01-09 Nokia Siemens Networks Gmbh & Co. Kg Commutation et reconfiguration simultanée des liaisons radios dans un système de télécommunications mobiles
KR100939722B1 (ko) 2008-08-11 2010-02-01 엘지전자 주식회사 데이터 전송 방법 및 이를 위한 사용자 기기

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Also Published As

Publication number Publication date
ATE277487T1 (de) 2004-10-15
BRPI0108975B1 (pt) 2015-07-28
BR0108975A (pt) 2004-12-07
KR100524270B1 (ko) 2005-11-01
CN1418443A (zh) 2003-05-14
DE50103757D1 (de) 2004-10-28
US6944453B2 (en) 2005-09-13
JP3673757B2 (ja) 2005-07-20
CN1418443B (zh) 2010-06-16
ES2227149T3 (es) 2005-04-01
JP2003526295A (ja) 2003-09-02
EP1262081B1 (fr) 2004-09-22
KR20020087408A (ko) 2002-11-22
US20030153313A1 (en) 2003-08-14
EP1262081A1 (fr) 2002-12-04
TR200402765T4 (tr) 2004-11-22
WO2001067795A1 (fr) 2001-09-13
AU2001240680A1 (en) 2001-09-17

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