WO1999026437A1 - Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications - Google Patents

Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications Download PDF

Info

Publication number
WO1999026437A1
WO1999026437A1 PCT/US1998/024370 US9824370W WO9926437A1 WO 1999026437 A1 WO1999026437 A1 WO 1999026437A1 US 9824370 W US9824370 W US 9824370W WO 9926437 A1 WO9926437 A1 WO 9926437A1
Authority
WO
WIPO (PCT)
Prior art keywords
time
base station
downlink
uplink
allocated
Prior art date
Application number
PCT/US1998/024370
Other languages
English (en)
Inventor
Michael Lenzo
Qun Shen
Original Assignee
Ericsson 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 Ericsson Inc. filed Critical Ericsson Inc.
Priority to EP98959453A priority Critical patent/EP1031247B1/fr
Priority to AT98959453T priority patent/ATE236497T1/de
Priority to JP2000521669A priority patent/JP2003526955A/ja
Priority to BR9814965-2A priority patent/BR9814965A/pt
Priority to CA002311292A priority patent/CA2311292A1/fr
Priority to AU15247/99A priority patent/AU1524799A/en
Priority to DE69813003T priority patent/DE69813003T2/de
Publication of WO1999026437A1 publication Critical patent/WO1999026437A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]

Definitions

  • the present invention relates to radio communications systems, and more particularly to duplex schemes in time-division multiple-access (TDMA) systems.
  • TDMA time-division multiple-access
  • time-division multiple-access wireless communications systems employ either a time-division duplex (TDD) scheme or a frequency-division duplex (FDD) scheme to separate uplink and downlink transmissions. Since both duplex schemes provide certain advantages and disadvantages, both schemes are routinely utilized in wireless communications applications.
  • TDD time-division duplex
  • FDD frequency-division duplex
  • time-division multiple-access with time-division duplex is used for frequency planning as well as signal packet and time slot assignment.
  • Such a time-division multiple-access / time-division duplex scheme is well suited for many business wireless communication applications (e.g., small-campus systems with micro or pico cells).
  • time-division multiple-access with either time-division duplex or frequency-division duplex can be preferable for licensed Personal Communication Service (PCS) frequency bands, depending upon customer demands and marketplace requirements.
  • PCS Personal Communication Service
  • Personal Communications Service system is primarily determined by a service provider having acquired a portion of the frequency spectrum, the technology and frequency usage implemented in such a system is ultimately driven by customer demand as well as legal and practical constraints. While a first customer may request a time-division multiple access / time-division duplex system for a particular business wireless application, a second customer may thereafter demand a time-division multiple access / frequency-division duplex system for a wireless local loop application.
  • the present invention fulfills the above-described and other needs by providing a flexible division duplex mechanism in a time-division multiple-access communications system. More specifically, the disclosed system utilizes a mixed, or hybrid, division duplex mechamsm such that uplink and downlink transmissions are separated in frequency while time slots associated with transmission and reception are also separated in time.
  • the hybrid duplex scheme referred to herein as frequency-time division duplex (FTDD)
  • FTDD frequency-time division duplex
  • the frequency-time division duplex system of the present invention provides the advantages of low power consumption and reduced hardware complexity normally associated with conventional time-division multiple-access / time-division duplex systems, while also providing improved interference characteristics by separating uplink and downlink frequency bands. Further, the proposed system allows a single hardware platform to be used for multiple technologies and applications. For example, base stations designed for a business wireless system based on time-division multiple-access / time-division duplex technology can also be used, with minor changes, for wireless local loop (WLL) applications conventionally based on time-division multiple-access / frequency- division duplex technology.
  • WLL wireless local loop
  • embodiments of the invention allow the nonrecurring engineering costs typically associated with technology and product development to be substantially reduced. As a result, development schedules and production cycles for implemented systems can be shortened, and service and product providers can respond more quickly to customer and market demand.
  • a base station includes a transceiver configured to transmit downlink communications signals to mobile stations via a first carrier frequency and to receive uplink commumcations signals from the mobile stations via a second carrier frequency, the downlink and uplink communications signals being transmitted and received via successive time division multiple access frames, each frame including a plurality of time slots.
  • a first time slot in each frame is allocated for downlink communication to the particular mobile station and a second time slot in each frame is allocated for uplink communication from the particular mobile station, the first and second allocated time slots being separated in time by a fixed time offset.
  • a duration of the fixed time offset can be different for each active communication link (e.g., for each call established). For example, where each frame is of duration T and includes 2N time slots, each time slot being of duration T/2N, the fixed time offset for each active communication link can be
  • ⁇ T (T/2N)*m, where m is an integer in the range from 1 to 2N-1.
  • a base station includes a transceiver configured to transmit downlink communications signals to mobile stations via a first carrier frequency and to receive uplink communications signals from the mobile stations via a second carrier frequency, the downlink and uplink communications signals being transmitted and received via successive time division multiple access frames, each frame including a plurality of time slots.
  • a downlink signal processing path and an uplink signal processing path of the transceiver share common signal processing components.
  • the shared signal processing components can include one or more of a filter, a local oscillator and a modem.
  • Figure 1 depicts an exemplary wireless communications system in which the teachings of the present invention can be implemented.
  • Figure 2A depicts a base station and a mobile station communicating in accordance with a conventional time-division multiple-access / time-division duplex scheme.
  • Figure 2B depicts an exemplary time slot arrangement in a conventional time-division multiple-access / time-division duplex system.
  • Figure 3A depicts a base station and a mobile station communicating in accordance with a conventional time-division multiple-access / frequency-division duplex scheme.
  • Figure 3B depicts an exemplary time slot arrangement in a conventional time-division multiple-access / frequency-division duplex system.
  • Figure 4A depicts a base station and a mobile station communicating in accordance with a flexible time-division multiple-access / frequency-time division duplex scheme according to the present invention.
  • Figure 4B depicts an exemplary time slot arrangement in a flexible time- division multiple-access / frequency-time division duplex system according to the invention.
  • Figure 4C depicts an alternative time slot arrangement in a flexible time- division multiple access / frequency-time division duplex system according to the invention.
  • Figure 5 is a block diagram of an exemplary transceiver constructed in accordance with the present invention.
  • FIG. 1 depicts a wireless communications system 100 in which the teachings of the present invention can be implemented.
  • the exemplary wireless system includes ten cells or coverage areas C1-C10, ten base stations Bl- B10, a timing master TM and ten mobile stations M1-M10.
  • Such a wireless system can be constructed, for example, in accordance with the Personal Wireless Telecommunication (PWT) standard, and can therefore be used, for example, to provide mobile communications within a building or throughout a campus including many buildings and open areas.
  • PWT Personal Wireless Telecommunication
  • a wireless system can include far more than ten cells, ten base stations and ten mobile stations; however, ten of each is sufficient for illustrative purposes.
  • one or more base stations can be situated in each of the cells.
  • Figure 1 shows the base stations located toward the cell centers, each base station can instead be located anywhere within a cell.
  • Base stations located toward a cell center typically employ omni-directional antennas, while base stations located toward a cell boundary typically employ directional antennas.
  • the timing master TM or radio exchange, maintains timing synchronization between the base stations as is known in the art.
  • the timing master can be connected to the base stations by cable, radio links, or both.
  • Each base station and each mobile station includes a transceiver for transmitting and receiving communications signals over the air interface.
  • the base and mobile stations communicate using a form of time, frequency or code division multiple access (i.e., TDMA, FDMA or CDMA) as is known in the art.
  • TDMA time, frequency or code division multiple access
  • CDMA code division multiple access
  • FIG. 2A depicts uplink and downlink communication according to a conventional TDD scheme. As shown, signals transmitted from a TDD base station B20 to a TDD handset M20, and those transmitted from the TDD handset M20 to the TDD base station B20, are separated in time. If, as shown in Figure 2B, a predetermined time interval T represents the duration of a single TDMA /
  • each frame is 10 milliseconds in duration and includes twenty-four data slots. Within a data frame, twelve time slots are used for transmission (from the TDD base station B20 to the TDD handset M20), and the remaining twelve time slots are used for reception (i.e., transmission from the TDD handset M20 to the TDD base station B20). Though transmissions and receptions are separated by certain fixed (or variable) time, they share a common frequency band. The channel of such a system is therefore defined by a predetermined frequency and time reference pair.
  • Such TDMA / TDD systems are widely adopted in various wireless communications applications.
  • An advantage of these systems is that of frequency efficiency, as both uplink and downlink transmissions use a common frequency carrier. Additionally, since transmissions and receptions are separated in time, a single hardware path (including filters, local oscillators, etc.) can be used for both functions. As a result, TDD systems are relatively low cost. Also, since receiving hardware can be turned off during transmission (and transmitting hardware can be turned off during reception), TDD systems consume relatively little power.
  • FDD frequency-division duplex
  • Figure 3A depicts uplink and downlink communications between a conventional FDD base station B30 and a conventional FDD handset M30
  • Figure 3B shows an exemplary TDMA / FDD frame T30. Since both transmit and receive are accomplished simultaneously, separate hardware paths are required in both base stations and terminals.
  • FDD systems are typically higher cost and consume more power as compared to conventional TDD systems.
  • FDD systems provide relatively little cross-channel interference and are sometimes preferred from an inter-system perspective.
  • a FDD scheme may be required to make a system compatible with proximate systems using an adjacent portion of the frequency spectrum.
  • FDD systems have also been widely adopted in wireless communications applications.
  • the present invention provides a hybrid, frequency-time division duplex (FTDD) scheme which provides certain of the advantages of both types of conventional system and which further allows a single hardware configuration to be readily adapted to suit virtually any wireless communications application.
  • FTDD frequency-time division duplex
  • a TDMA data frame is defined as including 2N time slots (N an integer) in which N slots are reserved for downlink transmission from a base station to a portable and the remaining N slots are reserved for uplink transmission from a portable to a base station.
  • N an integer
  • half of the frame, or T/2 is usually reserved for downlink transmission and the remaining half of the frame is usually reserved for uplink transmission.
  • a duplex link is set up with both frequency and time separation.
  • Equations (2) and (3) describe the frequency-division duplex aspect of the system. In addition to frequency separation, time separation is also provided.
  • the uplink and downlink communications between a base station and a portable are also separated by a fixed time offset.
  • the specific time offset is based on a frame length of 2N slots with a period of T/2N seconds/slot.
  • the time duplexing can then be defined generally for an uplink packet as S u (t,) and for a downlink packet as S d (t, + ⁇ T), where t, is defined as the start time of the uplink packet and
  • S u uplink packet
  • f u downlink packet
  • S d uplink packet
  • S d downlink packet
  • uplink and downlink transmissions occur at separate frequencies and on allocated time slot pairs, one time slot pair being allocated for each active link established between a base station and a mobile station.
  • the allocated uplink time slot either precedes or follows the corresponding allocated downlink time slot, within each TDMA frame, by the time offset ⁇ T.
  • the allocated time slot pairing is then maintained for the duration of the link.
  • Selection of the uplink and downlink time slots for each link can be based, for example, on a channel selection process which determines the best link arrangement. Determination of the best link arrangement can in tarn be based, for example, on an assessment of adjacent-channel and/or co-channel interference existing at the time of call setup.
  • the base station or the mobile station can be responsible for time slot selection and allocation. For example, the base station can select the uplink time slot based on interference conditions at the base station, while the mobile station selects the downlink time slot based on conditions at the mobile. Alternatively, the base station can select both uplink and downlink time slots, either independently or on command from the mobile stations.
  • each base station is not limited to a particular portion of a frame for uplink or downlink transmission, a single base station can be used to support portables throughout a particular coverage area.
  • a single base station can communicate with a mobile station using any available time slot arrangement which may be preferable for the mobile.
  • a single base station can support at most N duplex links simultaneously (assuming 2N time slots per
  • a second base station can be added in the coverage area to provide for full time and spectral efficiency (i.e., both base stations together can support 2N simultaneous conversations).
  • Figure 4A depicts a FTDD base station B40 and a FTDD terminal M40 communicating in accordance with the above described TDMA / FTDD scheme.
  • FIG. 4B depicts an exemplary combination of time slot pairings within a TDMA / FTDD data frame T40a for a single base station.
  • TDMA / FTDD data frame T40a for a single base station.
  • the combination of pairings in Figure 4B is but one example and that every possible combination of pairings is contemplated by the invention.
  • Figure 4C depicts a complimentary time slot pairing which can be used, for example, by a second co-located base station without causing interference with the first base station.
  • the first and second co- located base stations provide full time and spectral efficiency for the coverage area in which they are situated (i.e., each frequency in each time slot within each TDMA frame is utilized for either uplink or downlink communication).
  • appropriate base station synchronization is used to enable a handset to conduct communication with any base station in an overall system.
  • base station synchronization can be implemented via a timing master TM such as that depicted in Figure 1.
  • TM timing master
  • appropriate overhead signaling is required between base stations to implement handovers (e.g., information identifying the presently allocated pair is passed between base stations during a handover).
  • handovers e.g., information identifying the presently allocated pair is passed between base stations during a handover.
  • the overhead can be significantly reduced. See, for example, copending U.S. Patent Application No. , entitled
  • the TDMA / FTDD scheme of the invention provides, among other advantages, the power savings benefits typically associated with conventional TDMA / TDD systems. For example, since uplink and downlink transmissions are separated in time, the disclosed FTDD scheme enables the transmit and receive paths of a base station or mobile station transceiver to share certain components. This aspect of the invention is depicted in Figure 5.
  • an exemplary base station transceiver 500 includes a transmit signal processing path and a receive signal processing path.
  • the transmit processing path includes first and second transmit blocks 510, 520, first and second transmit / receive blocks 530, 540, a local oscillator 550, a duplexor 560 and an antenna 570.
  • the receive signal processing path includes the local oscillator 550, the duplexor 560 and the antenna 570, as well as first and second receive blocks 580, 590.
  • the first transmit block 510 can include, for example, a conventional upconverter
  • the second transmit block 520 can include, for example, power amplifiers and mixers.
  • the first receive block 580 can include, for example, low noise amplifiers (LNAs) and mixers
  • the second receive block 590 can include, for example, a conventional downcoverter and limiter.
  • the first transmit / receive block 530 can include, for example, a modem
  • the second transmit / receive block 540 can include, for example, bandpass filters.
  • the duplexor 560 can be, for example, a two-way filter or a switch.
  • the duplexor 560 couples the antenna 570 to the second transmit block 520 and isolates the antenna 570 from the first receive block 580.
  • Baseband transmit signals are processed by the first transmit / receive block 530 and are then upconverted, filtered and amplified in blocks 510, 540, 520, respectively, prior to transmission via the antenna 570.
  • the duplexor 560 couples the antenna 570 to the first receive block 580 and isolates the antenna 570 from the second transmit block 520. Radio frequency signals are received at the antenna 570 and then amplified, filtered and downconverted in blocks 580, 540 and 590, respectively, prior to being processed by the first transmit / receive block 530.
  • a base station transceiver constructed in accordance with the invention can be made smaller and less costly as compared to conventional TDMA / FDD transceivers.
  • the present invention teaches a time-division multiple-access system including a flexible frequency-time division duplex mechanism.
  • the disclosed system enables existing time-division multiple-access / time-division duplex hardware to be utilized for applications where dual duplex frequency bands are required.
  • the system maintains the flexibility of either using the same frequency band or separate bands for uplink and downlink communication. In each case, time-division duplex capability is maintained such that hardware cost and power consumption is minimized.

Landscapes

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

Abstract

Une architecture souple de voies supporte une communication radiofréquence en duplex intégral entre une station de base, telle qu'une station de base PWT ou DECT, et un groupe de terminaux à distance. La communication descendante depuis la base jusqu'aux terminaux s'effectue par l'intermédiaire d'une première porteuse de radiofréquence et la communication montante depuis les terminaux jusqu'à la base s'effectue par l'intermédiaire d'une deuxième porteuse de radiofréquence. Chaque porteuse est organisée de façon à produire un flux de données d'accès multiple par répartition dans le temps de N intervalles de temps (N étant un entier), de sorte que les deux porteuses ensemble constituent un système de 2N intervalles de temps. A l'intérieur de chaque séquence, les données depuis la base jusqu'à un terminal sont envoyées sur la première porteuse pendant un premier intervalle de temps et les données depuis le terminal jusqu'à la base sont envoyées sur la deuxième porteuse pendant un deuxième intervalle de temps, le premier et le deuxième intervalles de temps étant décalés selon un décalage de temps pouvant être variable sur les différentes liaisons de communication. Ce système constitue une architecture unifiée permettant à une plate-forme d'équipement unique d'accès multiple par répartition dans le temps de supporter de façon efficace et sélective soit un duplex par répartition dans le temps, soit un duplex par répartition en fréquence.
PCT/US1998/024370 1997-11-14 1998-11-13 Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications WO1999026437A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP98959453A EP1031247B1 (fr) 1997-11-14 1998-11-13 Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
AT98959453T ATE236497T1 (de) 1997-11-14 1998-11-13 Flexibles frequenz-zeitduplex in funkübertragungssystemen
JP2000521669A JP2003526955A (ja) 1997-11-14 1998-11-13 無線通信システムにおけるフレキシブルな周波数／時分割２重
BR9814965-2A BR9814965A (pt) 1997-11-14 1998-11-13 Estação base para uso em um sistema de comunicação sem fio incluindo uma pluralidade de estações móveis, sistema de comunicação sem fio, e, processo para conduzir comunicações entre uma estação base e estações móveis em um sistema de comunicação sem fio
CA002311292A CA2311292A1 (fr) 1997-11-14 1998-11-13 Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
AU15247/99A AU1524799A (en) 1997-11-14 1998-11-13 Flexible frequency-time division duplex in radio communications systems
DE69813003T DE69813003T2 (de) 1997-11-14 1998-11-13 Flexibles frequenz-zeitduplex in funkübertragungssystemen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6579797P 1997-11-14 1997-11-14
US60/065,797 1997-11-14

Publications (1)

Publication Number Publication Date
WO1999026437A1 true WO1999026437A1 (fr) 1999-05-27

Family

ID=22065185

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/024370 WO1999026437A1 (fr) 1997-11-14 1998-11-13 Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications

Country Status (2)

Country Link
AU (1) AU1524799A (fr)
WO (1) WO1999026437A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054434A1 (fr) * 1999-03-05 2000-09-14 Nokia Networks Oy Procede de transmission de donnees et systeme de liaison radio
WO2001026253A1 (fr) * 1999-10-01 2001-04-12 Nokia Corporation Systeme de liaisons radio
WO2002058270A2 (fr) * 2001-01-19 2002-07-25 Raze Technologies, Inc. Interface hertzienne tdd/fdd
JP2003506933A (ja) * 1999-07-30 2003-02-18 アリ・ホッティネン 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
EP1437847A1 (fr) * 2003-01-09 2004-07-14 Siemens Aktiengesellschaft Méthode et station radio pour la transmission d'informations
WO2005088866A1 (fr) * 2004-03-16 2005-09-22 Nokia Corporation Procede, dispositif et systeme destines a des communications en duplex
EP1626608A1 (fr) * 2004-08-10 2006-02-15 NTT DoCoMo, Inc. Appareil d'allocation d'intervalles de temps et procédé d'allocation d'intervalles de temps
EP2028897A1 (fr) * 2001-12-07 2009-02-25 Telefonaktiebolaget LM Ericsson (PUBL) Terminal mobile pour l'utilisation optimale du spectre dans des systémes cellulaires
KR100920273B1 (ko) * 2006-09-15 2009-10-08 노키아 코포레이션 듀플렉스 통신용 방법, 디바이스 및 시스템
WO2011011758A1 (fr) * 2009-07-23 2011-01-27 Qualcomm Incorporated Fonctionnement en duplex par répartition dans le temps asynchrone dans un réseau sans fil
WO2012156784A1 (fr) * 2011-05-17 2012-11-22 Telefonaktiebolaget L M Ericsson (Publ) Communication en mode duplex à répartition dans le temps (tdd) à double canal
GB2498814A (en) * 2012-01-30 2013-07-31 Renesas Mobile Corp A Partial Time Division Duplex (TDD), Frequency Division Duplex (FDD) for a transceiver used in carrier aggregation
US9426794B2 (en) 2000-11-15 2016-08-23 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5444696A (en) * 1993-10-29 1995-08-22 Pacific Communication Sciences, Inc. Frame structure using consecutive slot assignments for mobile communications
US5475677A (en) * 1994-12-29 1995-12-12 Bell Communications Research Inc. Compatible licensed and unlicensed band portable handset unit for TDMA wireless communications system
US5602836A (en) * 1993-11-24 1997-02-11 Lucent Technologies Inc. Multiple access cellular communication with circular interleaving and reduced dropped-packet runlengths
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
US5689502A (en) * 1995-06-05 1997-11-18 Omnipoint Corporation Efficient frequency division duplex communication system with interleaved format and timing adjustment control

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5444696A (en) * 1993-10-29 1995-08-22 Pacific Communication Sciences, Inc. Frame structure using consecutive slot assignments for mobile communications
US5602836A (en) * 1993-11-24 1997-02-11 Lucent Technologies Inc. Multiple access cellular communication with circular interleaving and reduced dropped-packet runlengths
US5617412A (en) * 1994-04-15 1997-04-01 Alcatel N.V. Frame/multiframe structure FDMA system and corresponding signal
US5475677A (en) * 1994-12-29 1995-12-12 Bell Communications Research Inc. Compatible licensed and unlicensed band portable handset unit for TDMA wireless communications system
US5689502A (en) * 1995-06-05 1997-11-18 Omnipoint Corporation Efficient frequency division duplex communication system with interleaved format and timing adjustment control

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7430188B1 (en) 1999-03-05 2008-09-30 Nokia Corporation Data transmission method and radio link system
AU766641B2 (en) * 1999-03-05 2003-10-23 Nokia Technologies Oy Data transmission method and radio link system
WO2000054434A1 (fr) * 1999-03-05 2000-09-14 Nokia Networks Oy Procede de transmission de donnees et systeme de liaison radio
JP2011030225A (ja) * 1999-07-30 2011-02-10 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2011024221A (ja) * 1999-07-30 2011-02-03 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP4680457B2 (ja) * 1999-07-30 2011-05-11 クゥアルコム・インコーポレイテッド 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2003506933A (ja) * 1999-07-30 2003-02-18 アリ・ホッティネン 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2012138908A (ja) * 1999-07-30 2012-07-19 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2011250442A (ja) * 1999-07-30 2011-12-08 Qualcomm Incorporated 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2011019241A (ja) * 1999-07-30 2011-01-27 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2012147439A (ja) * 1999-07-30 2012-08-02 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
JP2013123232A (ja) * 1999-07-30 2013-06-20 Qualcomm Inc 周波数分割二重および時間分割二重通信システム間のソフトハンドオフを実行するためのシステムおよび方法
WO2001026253A1 (fr) * 1999-10-01 2001-04-12 Nokia Corporation Systeme de liaisons radio
US9426794B2 (en) 2000-11-15 2016-08-23 Access Solutions, Ltd. Wireless communication system and device for coupling a base station and mobile stations
US6859655B2 (en) 2001-01-19 2005-02-22 Raze Technologies, Inc. TDD FDD air interface
US10264562B2 (en) 2001-01-19 2019-04-16 Access Solutions, Ltd. TDD FDD communication interface
WO2002058270A3 (fr) * 2001-01-19 2002-10-17 Raze Technologies Inc Interface hertzienne tdd/fdd
WO2002058270A2 (fr) * 2001-01-19 2002-07-25 Raze Technologies, Inc. Interface hertzienne tdd/fdd
EP2028897A1 (fr) * 2001-12-07 2009-02-25 Telefonaktiebolaget LM Ericsson (PUBL) Terminal mobile pour l'utilisation optimale du spectre dans des systémes cellulaires
EP1437847A1 (fr) * 2003-01-09 2004-07-14 Siemens Aktiengesellschaft Méthode et station radio pour la transmission d'informations
WO2005088866A1 (fr) * 2004-03-16 2005-09-22 Nokia Corporation Procede, dispositif et systeme destines a des communications en duplex
US8842581B2 (en) 2004-03-16 2014-09-23 Nokia Corporation Method, a device and a system for duplex communications
US7522924B2 (en) 2004-08-10 2009-04-21 Ntt Docomo, Inc. Slot allocation apparatus and slot allocation method
EP1626608A1 (fr) * 2004-08-10 2006-02-15 NTT DoCoMo, Inc. Appareil d'allocation d'intervalles de temps et procédé d'allocation d'intervalles de temps
KR100920273B1 (ko) * 2006-09-15 2009-10-08 노키아 코포레이션 듀플렉스 통신용 방법, 디바이스 및 시스템
WO2011011758A1 (fr) * 2009-07-23 2011-01-27 Qualcomm Incorporated Fonctionnement en duplex par répartition dans le temps asynchrone dans un réseau sans fil
KR101432186B1 (ko) * 2009-07-23 2014-08-20 퀄컴 인코포레이티드 무선 네트워크에서의 비동기 시분할 듀플렉스 동작
US9118468B2 (en) 2009-07-23 2015-08-25 Qualcomm Incorporated Asynchronous time division duplex operation in a wireless network
US10015789B2 (en) 2009-07-23 2018-07-03 Qualcomm Incorporated Asynchronous time division duplex operation in a wireless network
WO2012156784A1 (fr) * 2011-05-17 2012-11-22 Telefonaktiebolaget L M Ericsson (Publ) Communication en mode duplex à répartition dans le temps (tdd) à double canal
GB2498814A (en) * 2012-01-30 2013-07-31 Renesas Mobile Corp A Partial Time Division Duplex (TDD), Frequency Division Duplex (FDD) for a transceiver used in carrier aggregation
GB2498814B (en) * 2012-01-30 2013-12-04 Renesas Mobile Corp Transceiver

Also Published As

Publication number Publication date
AU1524799A (en) 1999-06-07

Similar Documents

Publication Publication Date Title
US6587444B1 (en) Fixed frequency-time division duplex in radio communications systems
US6556830B1 (en) Coverage area sectorization in time division multiple access/frequency-time division duplex communications systems
US5475677A (en) Compatible licensed and unlicensed band portable handset unit for TDMA wireless communications system
US6839333B1 (en) TDMA-TDD/FDD radio communication system and channel selection method and apparatus for such a system
JP3234602B2 (ja) セル式システム
US7313123B2 (en) Resource management and traffic control in time-division-duplex communication systems
AU728098B2 (en) Time division multiple access radio systems
US20140036739A1 (en) Method, base station and mobile station for tdd operation in a communication system
US20070147333A1 (en) System and method of transmission scheduling in time-division duplex communication system to minimize interference
US20140010125A1 (en) Method and Apparatus for Carrier Aggregation
WO2002023793A2 (fr) Systeme et procede de communication sans fil dans une region duplex a repartition en frequence
CN102461328A (zh) 用于实现蓝牙收发器与操作于FDD模式的WiMAX收发器之间的共存的多无线电通信设备和方法
JP2001359152A (ja) 無線通信システム、無線基地局装置、無線移動局装置、無線ゾーン割当て方法及び無線通信方法
WO1999026437A1 (fr) Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
EP1031247B1 (fr) Duplex souple a repartition en frequence et dans le temps dans des systemes de radiocommunications
CN101667946A (zh) 无线接入网、终端、频谱使用/复用方法、通信实现方法
CN1964222A (zh) 无线中转通信系统及方法
CA2309713A1 (fr) Communication en duplex a repartition de frequence et a repartition dans le temps dans des systemes de radiocommunication
WO1999026362A1 (fr) Communication en duplex a repartition de frequence et a repartition dans le temps dans des systemes de radiocommunication
JP3162576B2 (ja) 移動体通信装置
JP3436151B2 (ja) 通信方式及び子機装置
CN1960239B (zh) 基于tdm/tdma-fdd的无线中转通信系统及其通信方法
JP4638636B2 (ja) 無線端末局の通信切替え方法
MXPA00004505A (en) Flexible frequency-time division duplex in radio communications systems
MXPA00004508A (en) Frequency-time division duplex in radio communications systems

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 98813478.0

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

ENP Entry into the national phase

Ref document number: 2311292

Country of ref document: CA

Ref document number: 2311292

Country of ref document: CA

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: PA/a/2000/004505

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 1998959453

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: KR

ENP Entry into the national phase

Ref document number: 2000 521669

Country of ref document: JP

Kind code of ref document: A

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWP Wipo information: published in national office

Ref document number: 1998959453

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1998959453

Country of ref document: EP