EP0965186A1 - Procede de decalage des positionnements temporels de transmission pour systemes radiotelephoniques mobiles a acces multiple par difference de code en sequence directe (amdcsd) - Google Patents

Procede de decalage des positionnements temporels de transmission pour systemes radiotelephoniques mobiles a acces multiple par difference de code en sequence directe (amdcsd)

Info

Publication number
EP0965186A1
EP0965186A1 EP97909780A EP97909780A EP0965186A1 EP 0965186 A1 EP0965186 A1 EP 0965186A1 EP 97909780 A EP97909780 A EP 97909780A EP 97909780 A EP97909780 A EP 97909780A EP 0965186 A1 EP0965186 A1 EP 0965186A1
Authority
EP
European Patent Office
Prior art keywords
symbols
slot
integer number
transmitting
cdma
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97909780A
Other languages
German (de)
English (en)
Inventor
Per Hans Ake Willars
Erik Bengt Lennart Dahlman
Karim Jamal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP0965186A1 publication Critical patent/EP0965186A1/fr
Withdrawn legal-status Critical Current

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
    • 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]
    • H04B7/2656—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] for structure of frame, burst
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70706—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation with means for reducing the peak-to-average power ratio
    • 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
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure

Definitions

  • the present invention relates to code division multiple access (CDMA) mobile telephone systems, and more particularly, to a method for averaging interference over time between users utilizing discontinuous transmissions in a CDMA system
  • each physical channel carries a nominal information bit rate If the information to be transmitted is less than this nominal bit rate, discontinuous transmission (DTX) may be used Discontinuous transmission means that data is not transmitted over a user channel 100% of the time
  • DS-A direct sequence code division multiple access
  • CDMA Code Division Multiple Access
  • TPC transmitter power control
  • Discontinuous transmission may be done in one of two ways In one method referred to as “frame-wise DTX", the system only transmits one-half of the slots from any frame when half the nominal bit-rate is used Another method referred to as “slot-wise DTX” transmits one-half of the time during each slot of a frame
  • slot-wise DTX has the advantage that the interleaving depth will be kept at a maximum even for low bit rates
  • the present invention overcomes the foregoing and other problems with a method for altering transmission timing offsets within a DS-CDMA mobile telephone system Initially, a number of signals are transmitted over a plurality of parallel connections as slot-wise discontinuous transmissions between a base station and a mobile station The transmission timings of each one of the plurality of connections is altered by a predetermined number of symbols such that the transmission beginning and ending periods are not the same between any two of the plurality of parallel connections
  • the predetermined number of symbols may be calculated as a deterministic function of a short CDMA code number, or alternatively, may be a predefined value that is forwarded to the mobile station via a signaling channel from the base station
  • the desired effect may be achieved by limiting the predetermined value to the interval (0,N), where N is the number of symbols per slot of a frame
  • FIGURE 1 illustrates a prior art solution to unevenly spread interference between cells
  • FIGURE 2 illustrates the frame structure of a typical DS-CDMA system
  • FIGURE 3 illustrates discontinuous slot-wise transmissions of a typical DS- CDMA frame structure
  • FIGURE 4 is an illustration of the randomization method of the present invention
  • Each DS-CDMA frame 10 consists of a plurality of slots 15
  • the frames have a 10 ms length and include 16 slots 15 each
  • the number of slots for the frame length is merely one example of a frame structure that may include any number of slots
  • the slots 15 in each frame 10 are not used for different users, but instead, define the transmitter power control (TPC) cycle time.
  • TPC symbol 20 transmitted with each time slot
  • Multiplexed pilot symbols may also be used to enable coherent detection in the reverse or forward link Multiplexed pilot symbols are normally aligned with the TPC symbols 20
  • the data portion 25 of the time slot and the TPC/pilot symbols are continuously transmitted throughout the entire frame structure
  • discontinuous transmission will be desired
  • FIGURE 4 there is illustrated the method of the present invention wherein a plurality of slot- wise discontinuous transmissions 50 are offset in a manner such that an interference averaging effect is achieved This is accomplished by offsetting the entire connection timing of each user 55 by an integer number of symbols of the frame structure While the preferred embodiment of the invention is described with respect to offsetting the timing by an integer number of symbols, the timing may also be offset by any amount in other embodiments As can be seen in the figure, the connection of user 1 is unaffected and transmits in the fashion that it normally would for slot-wise discontinuous transmission However, each of the users 2-4 are offset by some integer number of symbols, such that they are not starting and stopping transmissions at the exact same times as user 1 or as each other
  • the offsets may be determined from the CDMA code phase or CDMA code number of the connection number and may be limited to the interval (0, ⁇ where N s is the number of symbols per slot Alternatively, the offset may be predefined, for example, the first connection would have an offset of 0, the second connection would have an offset of one symbol, the third connection would have an offset of two symbols, etc In this case, the mobile station would have to be informed of the offsets over a signaling channel
  • This method provides a simple way of averaging the interference of different users on the forward link of a DS-CDMA system
  • the method does not noticeably increase the receiver complexity and the offset scheme is easily determined by the mobile station receiver or, in the case of a predefined offset, is transmitted to the receiver via a signaling channel
  • Receiver complexity is not increased since once the offset for a channel is determined it will always be the same
  • the scheme provides no additional dispersion of the receiver timings of different slots, and only information regarding one timing offset is needed by the receiver in order to properly demodulate the signal

Landscapes

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

Abstract

L'invention concerne un procédé pour modifier les positionnements temporels des transmissions parmi une pluralité de transmissions discontinues parallèles (50). Dans un système AMDCSD comportant une pluralité de transmissions discontinues par tranche de temps (50), chaque liaison de transmission est décalée d'une valeur prédéterminée en vue de créer entre les cellules des interférences qui soient réparties uniformément dans le temps.
EP97909780A 1996-10-18 1997-09-26 Procede de decalage des positionnements temporels de transmission pour systemes radiotelephoniques mobiles a acces multiple par difference de code en sequence directe (amdcsd) Withdrawn EP0965186A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US73325696A 1996-10-18 1996-10-18
US733256 1996-10-18
PCT/SE1997/001632 WO1998018217A1 (fr) 1996-10-18 1997-09-26 Procede de decalage des positionnements temporels de transmission pour systemes radiotelephoniques mobiles a acces multiple par difference de code en sequence directe (amdcsd)

Publications (1)

Publication Number Publication Date
EP0965186A1 true EP0965186A1 (fr) 1999-12-22

Family

ID=24946859

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97909780A Withdrawn EP0965186A1 (fr) 1996-10-18 1997-09-26 Procede de decalage des positionnements temporels de transmission pour systemes radiotelephoniques mobiles a acces multiple par difference de code en sequence directe (amdcsd)

Country Status (10)

Country Link
EP (1) EP0965186A1 (fr)
JP (1) JP2001503219A (fr)
KR (1) KR20000052644A (fr)
CN (1) CN1234153A (fr)
AR (1) AR011254A1 (fr)
AU (1) AU4730397A (fr)
BR (1) BR9711931A (fr)
CA (1) CA2268665A1 (fr)
RU (1) RU99110385A (fr)
WO (1) WO1998018217A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6393010B1 (en) * 1998-08-19 2002-05-21 Qualcomm Incorporated Time offset technique for increasing the capacity of a CDMA system
US6396817B2 (en) 1998-08-31 2002-05-28 Qualcomm Incorporated Signal splitting method for limiting peak power in a CDMA system
US6310869B1 (en) * 1998-08-31 2001-10-30 Qualcomm Incorporated Method and apparatus for reducing amplitude variations and interference in communication signals, such as in wireless communication signals employing inserted pilot symbols
FI108270B (fi) 1998-11-09 2001-12-14 Nokia Corp Menetelmä ja järjestely katkottujen kehysten moodiin liittyvien mittausten tekemiseksi optimaalisen aikataulun mukaisesti solukkoradiojärjestelmässä
US6721349B1 (en) * 1999-01-28 2004-04-13 Qualcomm Incorporated Method and apparatus for reducing peak-to-average ratio in a CDMA communication system
JP3410379B2 (ja) * 1999-02-26 2003-05-26 松下電器産業株式会社 無線通信基地局装置及び無線通信方法
KR100556488B1 (ko) * 1999-08-12 2006-03-03 엘지전자 주식회사 역방향 링크 공통 채널에 대한 패킷 전송 제어 방법
FR2799323B1 (fr) * 1999-10-04 2002-04-19 Mitsubishi Electric France Procede de generation d'un mode compresse sur un canal composite comportant au moins deux canaux de transport et dispositif pour la mise en oeuvre de ce procede
FR2799322B1 (fr) * 1999-10-04 2001-12-28 Mitsubishi Electric France Procede de generation d'un mode compresse sur un canal composite comportant au moins deux canaux de transport et dispositif pour la mise en oeuvre de ce procede
US6665288B1 (en) 1999-11-08 2003-12-16 Ericsson Inc. Method and apparatus for reducing synchronization code interference in CDMA communications systems
US7292552B2 (en) 2002-03-14 2007-11-06 Qualcomm Incorporated Method and apparatus for reducing interference in a wireless communication system
US7542736B2 (en) * 2005-07-26 2009-06-02 M/A-Com, Inc. Techniques to decrease signal amplitude peak-to-average ratio in a wireless communications system
WO2011025326A2 (fr) * 2009-08-28 2011-03-03 Samsung Electronics Co., Ltd. Procédé et système d'amélioration de l'émission en exploitation multiutilisateur sur créneau temporel unique avec réutilisation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69433336T3 (de) * 1993-03-05 2008-06-19 Ntt Mobile Communications Network Inc. Cdma kommunikationsverfahren mit selektivem zugriff und anordnung für mobile stationen in denen dieses verfahren angewandt wird
TW306102B (fr) * 1993-06-14 1997-05-21 Ericsson Telefon Ab L M
JP2726220B2 (ja) * 1993-07-05 1998-03-11 沖電気工業株式会社 符号分割多元接続装置
US5729570A (en) * 1994-12-08 1998-03-17 Stanford Telecommunications, Inc. Orthogonal code division multiple access communication system having multicarrier modulation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9818217A1 *

Also Published As

Publication number Publication date
KR20000052644A (ko) 2000-08-25
JP2001503219A (ja) 2001-03-06
AR011254A1 (es) 2000-08-16
RU99110385A (ru) 2001-03-10
CA2268665A1 (fr) 1998-04-30
BR9711931A (pt) 1999-08-24
CN1234153A (zh) 1999-11-03
AU4730397A (en) 1998-05-15
WO1998018217A1 (fr) 1998-04-30
WO1998018217A9 (fr) 1999-05-27

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