WO1994000927A1 - Augmentation du niveau de puissance pendant la transmission d'une commande de transfert - Google Patents

Augmentation du niveau de puissance pendant la transmission d'une commande de transfert Download PDF

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Publication number
WO1994000927A1
WO1994000927A1 PCT/US1993/005078 US9305078W WO9400927A1 WO 1994000927 A1 WO1994000927 A1 WO 1994000927A1 US 9305078 W US9305078 W US 9305078W WO 9400927 A1 WO9400927 A1 WO 9400927A1
Authority
WO
WIPO (PCT)
Prior art keywords
power level
base
site
mobile
handoff command
Prior art date
Application number
PCT/US1993/005078
Other languages
English (en)
Inventor
Jeffrey D. Bonta
Barry J. Menich
Original Assignee
Motorola Inc.
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 Motorola Inc. filed Critical Motorola Inc.
Priority to JP50235894A priority Critical patent/JP3376583B2/ja
Priority to BR9306586A priority patent/BR9306586A/pt
Publication of WO1994000927A1 publication Critical patent/WO1994000927A1/fr
Priority to SE9404428A priority patent/SE9404428L/xx
Priority to FI946044A priority patent/FI946044A0/fi

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile

Definitions

  • Handing over from one radio-frequency (RF) channel to another in order to maintain a reasonable level of quality is a well known procedure in communications systems, specifically cellular radiotelephone systems.
  • the method of instructing a mobile to move from one RF channel to another is to transmit a digital message via a blank-and-burst (blank the voice transmission and burst the digital handoff message) technique in analog cellular radiotelephone systems and a frame stealing technique in digital cellular radiotelephone systems (such as time-division multiple access (TDMA) cellular radiotelephone systems).
  • TDMA time-division multiple access
  • the digital message, or handoff command is encoded and repeated in such a way that the receiving mobile has the best chance of decoding the message under adverse conditions.
  • most cellular systems suffer from thermal noise or interference (or both) at various locations throughout the geographic area being served. At times, the noise can be quite substantial with respect to the desired signal. If the signal-to-noise (S/N) ratio is poor enough in the downlink direction (transmission from a base-site to a mobile), the probability of successfully sending a handoff command from a serving base-site to a given mobile is significantly impaired.
  • S/N signal-to-noise
  • the signal path from the serving base-site on a given street to a mobile on a perpendicular street can be obstructed by buildings.
  • the pathloss from the serving base-site to the mobile can change for the worse 20-30 dB within 10-40 meters as the mobile turns a street corner (otherwise known as the "street corner effect").
  • Reaction time to this condition is essential since the S N ratio degrades rapidly, and hence the quality of the call degrades rapidly.
  • a handoff to an adjacent, alternate base-site (or cell) is required immediately in order to maintain the call. Since the mobile must receive a handoff command in order to perform handoff, a reasonable S/N ratio is essential for good probability of the mobile receiving and decoding the handoff command.
  • a base-site communicates to a mobile via a signal transmitted at a first power level.
  • the base-site operating at the first power level, commences transmission of a handoff command to the mobile and increases the power level of the signal transmitted from the first power level to a second power level during transmission of the handoff command.
  • FIG. 1 generally depicts a cellular radiotelephone system which may beneficially employ the present invention.
  • FIG. 3 generally depicts implementation of power level increase during handoff command transmission in a TDMA cellular radiotelephone system in accordance with the invention.
  • FIG. 4 generally depicts simulation results of power level increase during handoff command transmission in a TDMA cellular radiotelephone system in accordance with the invention.
  • FIG. 1 generally depicts a communication system, and more specifically a cellular radiotelephone system, which may beneficially employ the present invention.
  • base-sites 109-112 are coupled to a switch interface 102, which provides switching and interface functions between base-sites 109- 112 and a public switched telephone network (PSTN).
  • PSTN public switched telephone network
  • switch interface 102 may be either a Mobile services Switching Center (MSC) or a Base Station Controller (BSC).
  • MSC Mobile services Switching Center
  • BSC Base Station Controller
  • base-site 109 communicates to a mobile 108 via a signal 106.
  • signal 106 is a full duplex radio frequency (RF) signal having a downlink transmission (transmission from base-site 109 to mobile 108) frequency range between 935-960 MHz and an uplink transmission (transmission from mobile 108 to base-site 109) frequency range between 890-915 MHz.
  • RF radio frequency
  • the cellular radiotelephone system depicted in FIG. 1 is a time-division multiple access (TDMA) cellular radiotelephone system, consequently, signal 106 has TDMA timeslots multiplexed thereon.
  • FIG. 2 generally depicts a detailed block diagram of base-sites
  • base-sites 109-112 which may implement the present invention.
  • base-sites 109-112 are generally comprised of an antenna 200 which receives and transmits signal 106 to mobile 108.
  • Antenna 200 is coupled to a receiver 204 and a transmitter 210 via a duplexer 202.
  • Duplexer 202 is essentially two bandpass filters, one having a frequency range between 935-960 MHz for downlink transmission via transmitter 210, and a second having a frequency range between 890-915 MHz for uplink reception by receiver 204.
  • receiver 204 receives signal 106 and, using signal strength indication (SSI) block 214, monitors the signal level of signal 106.
  • SSI signal strength indication
  • Output from SSI block 214 is input into control/equalizer board 206, which performs all necessary channel processing and provides coupling to channel equalizers 208.
  • control/equalizer board 206 commences transmission of a handoff command to mobile 108.
  • control/equalizer board 206 will send the appropriate handoff command to transmitter 210 for transmission of the handoff command at a first power level PI to mobile 108 via signal 106.
  • control equalizer board 206 will instruct PA control board 216 to increase the power level of signal 106 from the first power level PI to a second power level P2 during transmission of the handoff command. This increase may either be a single-step increase or an incremental increase. If the increase is an incremental increase, the process of increasing the level of signal 106 during transmission of the handoff command is repeated until handoff of mobile 108 is complete, or the process eventually terminates itself.
  • TDMA cellular rad otelephone systems such as the group special mobile (GSM) Pan-European Digital Cellular System, the United States Digital Cellular (USDC) system described in EIA Standard IS-54, January 1991, printed in the USA, and the Japanese Digital Cellular (JDC) system described in Research and
  • a need for handoff occurs when, for example, mobile 108, which is communicating to base-site 109 via signal 106, moves to a point where the quality of signal 106 (typicaUy the power level of signal 106 as seen by mobile 108) degrades beyond a predetermined threshold. Since, when handoff is required, the quality of signal 106 has degraded beyond a predetermined threshold, transmission of a handoff command via signal 106 would likewise suffer from the same degradation.
  • base- sites 109-112 incorporate variable power-level power amplifiers, thus if base-site 109 can be instructed to increase its output power by some level during the transmission of the handoff command to mobile 108, an increase of the probability that mobile 108 receives the handoff command, and a corresponding reduction of the rate of dropped calls, will occur.
  • FIG. 3 generally depicts power level increase during handoff command transmission in a TDMA cellular radiotelephone system in accordance with the invention.
  • eight (8) timeslots t0-t7 comprise frames F1-F68. Of course, other frames occur before and after frames F1-F68, but these frames are not depicted for clarity.
  • timeslots t0-t7 of frames F1-F68 are continuous in time, and are defined in GSM Recommendation 5.02, version 3.4.1, January, 1990.
  • timeslot tO is dedicated to, inter alia, control channel (CCH) and broadcast channel (BCCH) information.
  • the remaining timeslots tl-t7 of each frame F1-F68 are generally dedicated to voice transmission.
  • base-site 109 communicates to mobile 108 via signal 106, the voice communication occurs during a dedicated one timeslot (indicated by "V" shown in timeslot t3, FIG. 3) of each frame F1-F36.
  • Transmission of the handoff command (indicated by "HC" shown in timeslot t3, FIG. 3) to mobile 108 at an increased power level may occur after the detection of a predetermined triggering event.
  • the predetermined triggering event is the elapse of a predetermined number of transmissions at a first power level.
  • timeslot t3 of frame Fl depicts transmission of a handoff command HC at a power level PI. Transmission of the handoff command HC occurs during timeslot t3 for eight consecutive frames F1-F8. In this scenario, handoff command HC steals timeslot t3 from voice communication V.
  • base-site 109 When transmission of the handoff command HC at the first power level PI is completed, voice communication V continues for the next 26 frames F9-F34 at power level PI. If base-site 109, which is transmitting the timeslots depicted in FIG. 3, does not receive an indication that handoff has been completed (for example, a "CLEAR SOURCE" command from switch interface 102), base-site 109 will automatically increase the power level of the transmission of the handoff command HC during timeslot t3 of frames F35-F42 to a second power level P2. In this scenario, the handoff command is repeated every 34 frames, thus the triggering event would be the elapse of 34 frames, where eight frames have the handoff command transmitted during timeslot t3 at a first power level PI.

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

Abstract

Un site de base (109) communiquant avec un mobile (108) augmente le niveau de puissance de la transmission d'une commande de transfert quand cela est nécessaire. Le site de base (109) détecte le moment de la nécessité du transfert et transmet la commande de transfert selon un premier niveau de puissance (P1) sensiblement égal au niveau de puissance du site de base (109) vers le niveau de puissance de communication vocale du mobile (108). Si la commande de transfert n'atteint pas le mobile (108), soit après l'expiration d'une durée prédéterminée, soit après tout autre évènement de déclenchement prédéterminé, le site de base (109) transmet la commande de transfert selon un deuxième niveau de puissance amplifié (P2).
PCT/US1993/005078 1992-06-22 1993-06-01 Augmentation du niveau de puissance pendant la transmission d'une commande de transfert WO1994000927A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP50235894A JP3376583B2 (ja) 1992-06-22 1993-06-01 ハンドオフコマンド送信の間の電力レベル増大
BR9306586A BR9306586A (pt) 1992-06-22 1993-06-01 Local-base em sistema de comunicações local-base emsistema de radiotelefone celular de acesso múltiplo de divisão de tempo e divisão de código processo de transferência em sistema de comunicações processo de transferência em sistema de comunicações processo de transferência em sistema de radio telefone celular de acesso múltiplo de divisão de tempo e divisão de código
SE9404428A SE9404428L (sv) 1992-06-22 1994-12-21 Effektökning under överföring av hand-off-kommando
FI946044A FI946044A0 (fi) 1992-06-22 1994-12-22 Tehotason suurentaminen kanavanvaihtokäskyn lähetyksen aikana

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90213092A 1992-06-22 1992-06-22
US07/902,130 1992-06-22

Publications (1)

Publication Number Publication Date
WO1994000927A1 true WO1994000927A1 (fr) 1994-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/005078 WO1994000927A1 (fr) 1992-06-22 1993-06-01 Augmentation du niveau de puissance pendant la transmission d'une commande de transfert

Country Status (6)

Country Link
JP (1) JP3376583B2 (fr)
BR (1) BR9306586A (fr)
CA (1) CA2136543A1 (fr)
FI (1) FI946044A0 (fr)
SE (1) SE9404428L (fr)
WO (1) WO1994000927A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024102A2 (fr) * 1994-02-25 1995-09-08 Nokia Telecommunications Oy Procede de transmission d'appels de priorites differentes dans un reseau cellulaire
EP0797318A2 (fr) * 1996-03-18 1997-09-24 Nec Corporation Régulation de puissance dans un système de communication cellulaire
EP0964598A2 (fr) * 1998-06-11 1999-12-15 Nec Corporation Dispositif pour transfert de stations mobiles sujets aux variations soudaines d'intensité du champ à la frontière avec cellules voisines
WO2002019563A2 (fr) * 2000-09-01 2002-03-07 Qualcomm Incorporated Procédé et dispositif d'attributions des puissances par répartition dans le temps dans un système de radiocommunications
CN1101122C (zh) * 1997-06-27 2003-02-05 日本电气株式会社 移动无线通讯系统及其无线电电路控制方法
US6766643B2 (en) 2000-04-03 2004-07-27 Henrik Frans Christensen Wind and wave energy plant
WO2006107557A1 (fr) * 2005-03-31 2006-10-12 Lucent Technologies Inc. Transmission de messages de transfert utilisant grande puissance
US7499430B2 (en) 2002-05-03 2009-03-03 Lg Electronics Inc. Switch frame, method of transmitting the switch frame and a quality indicator channel structure including the switch frame
US9564963B2 (en) 1995-06-30 2017-02-07 Interdigital Technology Corporation Automatic power control system for a code division multiple access (CDMA) communications system
US10485045B2 (en) * 2014-03-21 2019-11-19 Samsung Electronics Co., Ltd. Random access method and apparatus for use in wireless communication system supporting dual connectivity

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000023225A (ja) * 1998-06-30 2000-01-21 Kyocera Corp 携帯電話システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613990A (en) * 1984-06-25 1986-09-23 At&T Bell Laboratories Radiotelephone transmission power control
EP0515335A2 (fr) * 1991-05-17 1992-11-25 Telefonaktiebolaget L M Ericsson Contrôle de la puissance de transmission initiale d'une station mobile dans un système de radiotéléphone mobile
US5203010A (en) * 1990-11-13 1993-04-13 Motorola, Inc. Radio telephone system incorporating multiple time periods for communication transfer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613990A (en) * 1984-06-25 1986-09-23 At&T Bell Laboratories Radiotelephone transmission power control
US5203010A (en) * 1990-11-13 1993-04-13 Motorola, Inc. Radio telephone system incorporating multiple time periods for communication transfer
EP0515335A2 (fr) * 1991-05-17 1992-11-25 Telefonaktiebolaget L M Ericsson Contrôle de la puissance de transmission initiale d'une station mobile dans un système de radiotéléphone mobile

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024102A3 (fr) * 1994-02-25 1995-11-09 Nokia Telecommunications Oy Procede de transmission d'appels de priorites differentes dans un reseau cellulaire
AU686744B2 (en) * 1994-02-25 1998-02-12 Nokia Telecommunications Oy Method for transmitting calls of different priorities in a cellular network
US5930684A (en) * 1994-02-25 1999-07-27 Nokia Telecommunications Oy Method for transmitting calls of different priorities which are associated with different power levels in a cellular network
WO1995024102A2 (fr) * 1994-02-25 1995-09-08 Nokia Telecommunications Oy Procede de transmission d'appels de priorites differentes dans un reseau cellulaire
US9564963B2 (en) 1995-06-30 2017-02-07 Interdigital Technology Corporation Automatic power control system for a code division multiple access (CDMA) communications system
EP0797318A2 (fr) * 1996-03-18 1997-09-24 Nec Corporation Régulation de puissance dans un système de communication cellulaire
EP0797318A3 (fr) * 1996-03-18 2000-12-20 Nec Corporation Régulation de puissance dans un système de communication cellulaire
CN1101122C (zh) * 1997-06-27 2003-02-05 日本电气株式会社 移动无线通讯系统及其无线电电路控制方法
EP0964598A2 (fr) * 1998-06-11 1999-12-15 Nec Corporation Dispositif pour transfert de stations mobiles sujets aux variations soudaines d'intensité du champ à la frontière avec cellules voisines
EP0964598A3 (fr) * 1998-06-11 2000-04-19 Nec Corporation Dispositif pour transfert de stations mobiles sujets aux variations soudaines d'intensité du champ à la frontière avec cellules voisines
US6442150B1 (en) * 1998-06-11 2002-08-27 Nec Corporation CDMA handoff arrangement for mobile station encountering sudden field strength variations at the boundary of adjacent cells
US6766643B2 (en) 2000-04-03 2004-07-27 Henrik Frans Christensen Wind and wave energy plant
WO2002019563A3 (fr) * 2000-09-01 2003-01-23 Qualcomm Inc Procédé et dispositif d'attributions des puissances par répartition dans le temps dans un système de radiocommunications
US7099384B1 (en) 2000-09-01 2006-08-29 Qualcomm, Inc. Method and apparatus for time-division power assignments in a wireless communication system
WO2002019563A2 (fr) * 2000-09-01 2002-03-07 Qualcomm Incorporated Procédé et dispositif d'attributions des puissances par répartition dans le temps dans un système de radiocommunications
US7499430B2 (en) 2002-05-03 2009-03-03 Lg Electronics Inc. Switch frame, method of transmitting the switch frame and a quality indicator channel structure including the switch frame
WO2006107557A1 (fr) * 2005-03-31 2006-10-12 Lucent Technologies Inc. Transmission de messages de transfert utilisant grande puissance
US10485045B2 (en) * 2014-03-21 2019-11-19 Samsung Electronics Co., Ltd. Random access method and apparatus for use in wireless communication system supporting dual connectivity
US11116026B2 (en) 2014-03-21 2021-09-07 Samsung Electronics Co., Ltd. Random access method and apparatus for use in wireless communication system supporting dual connectivity
US11743959B2 (en) 2014-03-21 2023-08-29 Samsung Electronics Co., Ltd. Random access method and apparatus for use in wireless communication system supporting dual connectivity

Also Published As

Publication number Publication date
FI946044A (fi) 1994-12-22
JPH07508381A (ja) 1995-09-14
BR9306586A (pt) 1998-12-08
SE9404428L (sv) 1995-02-14
JP3376583B2 (ja) 2003-02-10
SE9404428D0 (sv) 1994-12-21
CA2136543A1 (fr) 1994-01-06
FI946044A0 (fi) 1994-12-22

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