WO2001086992A1 - Amelioration de la capacite d'un systeme amdc - Google Patents

Amelioration de la capacite d'un systeme amdc Download PDF

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Publication number
WO2001086992A1
WO2001086992A1 PCT/EP2001/005256 EP0105256W WO0186992A1 WO 2001086992 A1 WO2001086992 A1 WO 2001086992A1 EP 0105256 W EP0105256 W EP 0105256W WO 0186992 A1 WO0186992 A1 WO 0186992A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminals
base station
data rate
mobile
value
Prior art date
Application number
PCT/EP2001/005256
Other languages
English (en)
Inventor
William Neil Robinson
Nicholas William Whinnett
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 BR0110525-6A priority Critical patent/BR0110525A/pt
Priority to JP2001583084A priority patent/JP2003533149A/ja
Priority to AU69000/01A priority patent/AU6900001A/en
Priority to KR1020027014995A priority patent/KR20020091282A/ko
Priority to EP01947268A priority patent/EP1282998A1/fr
Publication of WO2001086992A1 publication Critical patent/WO2001086992A1/fr

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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
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H04B7/264—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for data rate control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]

Definitions

  • This invention relates to improving the performance of a Code Division Multiple Access (CDMA) system, and preferably to one including mixed voice and data services.
  • CDMA Code Division Multiple Access
  • CDMA systems are well known and examples of such systems which are known or proposed include UMTS, cdmaOne, W-CDMA, Multi-Point CDMA WiLL Technologies, and any other DS-CDMA (Direct Sequence-CDMA) systems.
  • the present invention is also applicable to frequency-hopping CDMA systems.
  • CDMA systems are now well established but efforts to improve such systems have frequently focused on the delivery of speech and other circuit switch services using power control and soft hand-off techniques amongst others.
  • Examples of such services are e-mail, file transfer, still image delivery, non real-time speech, non real-time video images and the like. All of these services will be offered by third generation systems such as UMTS and can be supported by packet data transmission mechanisms which can be bursty and tolerate delay variation.
  • a typical cellular telephone system is shown in Figure 1.
  • the system comprises a plurality of base stations Bj to B n and a second plurality of mobile terminals MTi to MT n (e.g. mobile telephones or radios) using the cellular system.
  • MTi mobile telephones or radios
  • each of the base stations is receiving and decoding transmissions from several mobile terminals MT at a given frequency bandwidth. This is shown schematically in Figure 2. Also, as shown in Figure 1, the signal transmitted from each mobile terminal, such as MT la will usually be received by a plurality of base stations. In this case, the signal from mobile terminal MTi is being received by base stations B ls B 2 , B 3 and B 4 although, as it is at different distances from these, the signal strength received by each base station will differ. Similar, the mobile terminal MTi could receive transmissions from each of these base stations.
  • any given base station is receiving and decoding transmissions from a number of mobile terminals.
  • any particular base station only has a certain uplink capacity. This may be seen as the maximum useful received power which the base station can handle whilst still maintaining a satisfactory level of interference from other transmitters.
  • the amount of useful received power received by the base station at any time is clearly dependent upon the number of mobile terminals with which it is communicating and the signal power received from each one (a terminal can vary its transmitting power). Referring to Figure 3, there is shown a plot of power received by the base station against time. At a first time, only a first mobile terminal MT a is communicating and therefore the base station received an average power of P a .
  • a second terminal begins communicating, in addition to the first terminal, at a power P 2 .
  • the power received by the base station therefore becomes, on average, Pi + P .
  • a third station MT C is added at a power of P 3 and the power received goes up to P ⁇ + P 2 + P 3 and so on.
  • the transmissions from each terminal may be seen as a source of interference for the received signal of the other terminals as detected at the base station.
  • the base station may have a maximum capacity P M A X which now begins to be approached.
  • a given base station is receiving and decoding transmissions from a number of mobile terminals as described.
  • the uplink capacity of that base station may not yet be saturated.
  • the maximum capacity of the base station has not yet been reached. It is most efficient for the base station to be fully utilised and therefore any of terminals MT a to MT could increase their power output, which would increase the total power received and cause it to approach P M AX-
  • the present invention arose in an attempt to avoid this situation.
  • a method for utilising resources of a CDMA telecommunications system comprising a plurality of base stations and one or more mobile terminals, which method comprises causing the base stations to provide, to the one or more terminals whether they have unused capacity and causing one or more of the mobile terminal to change or maintain constant its data rate or power output depending upon the unused capacity messages received from the base stations.
  • a CDMA telecommunications network comprising a first plurality of base stations and one or more mobile terminals, wherein each base station is adapted to indicate to the or each mobile terminal with which it is in communication, any unused capacity, and wherein the mobile terminals are adapted to change or maintain their data rate or power output dependent upon the unused capacity indication received from the base stations.
  • the invention provides a base station for a mobile telecommunications network, including means for indicating any unused uplink capacity to mobile terminals with which it is in radio communication.
  • the invention provides a mobile terminal, for a CDMA telecommunications system, and having a variable data rate, comprising means for receiving indications of unused uplink capacity from any base stations with which it is in communication, and means for maintaining or changing the data rate or power output of the terminal in accordance with the unused capacity indications received from the base stations.
  • Figure 1 shows schematically a cellular network
  • Figure 2 shows a plurality of mobile terminals sending and receiving information to and from a base station
  • Figure 3 shows schematically the power load on a base station
  • Figure 4 shows schematically an alternative power load on a base station
  • Figure 5 shows schematically a base station and a mobile terminal.
  • each of the base stations Bi to B 7 has a particular capacity.
  • each of the base stations is arranged to broadcast a number or value which may be called the unused uplink capacity broadcast number (UUCBN).
  • UUCBN the unused uplink capacity broadcast number
  • the base station can therefore indicate, in its UUCBN, the amount of unused uplink capacity f (PM A X — PT which is available.
  • the amount of indication of unused capacity in this broadcast may be artificially reduced if, for example, there is a fully loaded base station nearby, such as B6, which may not be being decoded by the one or more mobiles in the vicinity, but where interference may still occur.
  • Each mobile terminal which is transmitting packet data decodes the UUCBN broadcast from each of the base stations to which the mobile is connected. This need not require any additional hardware at the mobile terminal, simply a small modification to the software so that amongst the many different types of data which the terminal receives from the base station, the UUCBN data can also be decoded.
  • Each mobile terminal can, of course, receive signals from several base stations, as is shown from Figure 1.
  • the mobile terminal which is in a position to transmit packet data or other data which is tolerant of delay variations, therefore continuously determines which of the following three states apply:
  • one or more of the UUCBN broadcasts indicate that the uplink capacity at the respective base station is fully utilised (i.e. maximum value for self plus inter-cell interference).
  • one or more of the UUCBN broadcasts indicates that the uplink capacity at the respective base station is being adversely affected by excessive interference.
  • state 1 exists, then at least one mobile terminal could increase its data rate. However, it should be remembered that there may be multiple mobile terminals transmitting packet data, and which all may have simultaneously detected that state 1 exists for the respective terminal. Thus, in Figure 1, if base station Bi has unused uplink capacity, this would be noted by both mobile terminals MTi and MT 2 . However, if both those terminals attempt to increase their data rate, then the uplink capacity may become overloaded. The number of mobile terminals which have detected that state 1 exists is not known to the terminals themselves.
  • a form of uplink bandwidth contention resolution is required so that at least one terminal can exploit the unused uplink capacity. That is, some form of competition between terminals is necessary in order that only some of them can increase their data rate or power output so as to take advantage of the uplink capacity of the base station.
  • Each base station with unused uplink capacity will at any time have knowledge of how many terminals which are transmitting packet data (Mp) are being received at that base station.
  • the base station transmits that number of terminals as a number, known as the Unused Capacity Access Control Number (UCACN).
  • UCACN Unused Capacity Access Control Number
  • the UCACN is directly derived from that number of terminals using an a priori defined algorithm. This may be any of a number of suitable algorithms but example algorithms for the generation of the UCACN may be as follows:
  • K is a factor for which a value is selected to balance the probability of an excessive number of terminals accessing the unused uplink capacity with the probability that no terminals access the unused uplink capacity
  • the series a, b, c represent subscription priority weighting factors. These may be used if, for example, users may be able to pay a premium in their subscription which entitles them to priority access. In embodiments of the invention, the payment of such a premium does not guarantee priority access but gives a higher probability that priority access will be given to that terminal.
  • Each of the Mp terminals determines whether it is capable of increasing its uplink data transmission rate within the available capacity which has been indicated by the set of received UUCBNs. If this is the case, the terminal randomly generates an Access Attempt Number (AAN) which preferably has a probability of 1/UCACN of meeting some selection criteria (e.g. less than some threshold value). An alternative relationship between the AAN and UCACN may also be used without deviating from the main purpose of this invention. If the particular criterion is met, then the mobile terminal indicates to the or each base station which has unused capacity, that it will increase its data rate and proceeds to increase its data rate. This is typically done by one pre-determined data rate step, e.g. doubling its data rate.
  • the algorithm for generating the AAN may include a factor giving lower rate users a better chance of fulfilling the selection criterion. This is because a user who is currently sending data at a lower bit rate is able to increase the power level by a small amount and therefore more of these users may be able to increase their rate, whereas a higher rate user, by doubling his rate, may too quickly cause the uplink capacity to be exceeded.
  • a factor 2 geometric relationship such as 4, 8, 16, 32, etc
  • AAN Random Number/Existing Data Rate (4)
  • AAN may also be influenced by the number of base stations with which the terminal is in soft handoff.
  • the algorithm in the terminal for generating the AAN can be suitably adjusted to take this into account. For example:
  • AAN Random Number x Priority Waiting (5)
  • the AAN may be based on the following algorithm:
  • AAN Random Number x Priority Waiting/Existing Data Rate (6) if
  • AAN > threshold value then increase data rate else no change endif
  • the mobile terminal indicates to the affected base station that it is about to reduce its data rate and proceeds to reduce its data rate by a pre-determined rate step.
  • This reduction in data rate can be achieved by either terminating one of the spreading codes being used by the mobile (in the case of multiple codes being employed) or by increasing the spreading rate but keeping the absolute chipping rate the same.
  • mobile terminals in state 3 which are in soft handoff, but who are not actually being power controlled by the base station indicating excessive interference, may be preferentially permitted to keep their present data rates, since their interference contribution will be less. This is because the received power from these mobile terminals will be less than for those mobile terminals who are being power controlled by the base station.
  • a threshold detection algorithm could be:
  • DRRN Random Number x Priority Waiting x PC-fac/Existing
  • DRRN is "Data Rate Reduction Number"
  • FIG. 5 shows a base station B 10 and a mobile terminal MT 10 .
  • Each has a respective processing means 50, 51 used for generating the respective values of the present invention, such as the UUCBN, UCACN and AAN.
  • the processing means will generally be the existing processors which the respective stations already have, and software may be used in embodiments of the invention to generate the various values, etc.

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

Abstract

Procédé servant à utiliser les ressources d'un système de télécommunications AMDC comprenant une pluralité de stations de base et un ou plusieurs terminaux mobiles. Ce procédé consiste à demander aux stations de base d'indiquer à un ou plusieurs de ces terminaux s'ils possèdent une capacité non utilisée et à demander à un ou plusieurs de ces terminaux mobiles de modifier ou de maintenir la constance de son débit de données en fonction de l'indication de capacité non utilisée reçue des stations de base. On peut mettre en application une phase de résolution de contention, de sorte que seuls des terminaux suffisants augmentent leur débit de données afin d'absorber la capacité non utilisée.
PCT/EP2001/005256 2000-05-08 2001-05-08 Amelioration de la capacite d'un systeme amdc WO2001086992A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR0110525-6A BR0110525A (pt) 2000-05-08 2001-05-08 Melhoramento do desempenho de um sistema cdma
JP2001583084A JP2003533149A (ja) 2000-05-08 2001-05-08 Ｃｄｍａシステムの性能の改良
AU69000/01A AU6900001A (en) 2000-05-08 2001-05-08 Improving the performance of a cdma system
KR1020027014995A KR20020091282A (ko) 2000-05-08 2001-05-08 Ｃｄｍａ 시스템의 성능 개선 방법 및 장치
EP01947268A EP1282998A1 (fr) 2000-05-08 2001-05-08 Amelioration de la capacite d'un systeme amdc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0011114.6 2000-05-08
GB0011114A GB2363689A (en) 2000-05-08 2000-05-08 Improving usage of CDMA system capacity

Publications (1)

Publication Number Publication Date
WO2001086992A1 true WO2001086992A1 (fr) 2001-11-15

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PCT/EP2001/005256 WO2001086992A1 (fr) 2000-05-08 2001-05-08 Amelioration de la capacite d'un systeme amdc

Country Status (9)

Country Link
EP (1) EP1282998A1 (fr)
JP (1) JP2003533149A (fr)
KR (1) KR20020091282A (fr)
CN (1) CN1428065A (fr)
AU (1) AU6900001A (fr)
BR (1) BR0110525A (fr)
GB (1) GB2363689A (fr)
RU (1) RU2002132893A (fr)
WO (1) WO2001086992A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006048631A1 (fr) * 2004-11-04 2006-05-11 Siemens Aktiengesellschaft Procede de commande d'un taux de transmission dans un terminal mobile lors d'un transfert intercellulaire sans coupure
WO2008039034A2 (fr) * 2006-09-29 2008-04-03 Lg Electronics Inc. Procédé d'attribution de ressources à un canal de commande de liaison montante
KR101306728B1 (ko) * 2006-09-29 2013-09-10 엘지전자 주식회사 상향링크 제어채널에 대한 자원 할당 방법
US8744465B2 (en) 2005-06-16 2014-06-03 Qualcomm Incorporated Resource allocation method in a communication system

Families Citing this family (5)

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DE10226652B4 (de) * 2002-06-14 2004-10-28 Siemens Ag Verfahren zur Bitratenanpassung einer Funkkommunikationsverbindung
GB2403630A (en) * 2003-06-30 2005-01-05 Nokia Corp Adjusting data burst transmission rates in broadcast services
GB2420247B (en) 2004-11-10 2008-02-27 Siemens Ag A method of scheduling one or more terminals from a base station
GB0716308D0 (en) * 2007-08-22 2007-10-03 Vodafone Plc Data capacity
EP3258680A1 (fr) * 2016-06-17 2017-12-20 Nokia Solutions and Networks Oy Prioritisation de réseau pour des multi-abonnements

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WO1995007578A1 (fr) * 1993-09-08 1995-03-16 Qualcomm Incorporated Procede et appareil de determination du debit de donnees transmises dans un systeme de communications a plusieurs utilisateurs
EP0767548A2 (fr) * 1995-10-05 1997-04-09 AT&T Corp. Système d'accès multiple par répartition de codes et service d'allocation à la demande des utilisateurs basé sur la charge et les interférences
US5754541A (en) * 1994-06-20 1998-05-19 Nokia Telecommunications Oy Data transmission method, base station, and subscriber terminal
WO1999009779A1 (fr) * 1997-08-20 1999-02-25 Qualcomm Incorporated Procede et appareil pour l'ordonnancement de la vitesse de liaison de retour
WO2001003357A1 (fr) * 1999-07-02 2001-01-11 Qualcomm Incorporated Procede et systeme pour determiner une vitesse de transmission par liaison inverse dans un systeme de communication sans fil

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FI964707A (fi) * 1996-11-26 1998-05-27 Nokia Telecommunications Oy Menetelmä kuormituksen kontrolloimiseksi ja radiojärjestelmä
GB2341050B (en) * 1998-08-27 2003-02-12 Motorola Ltd Bandwidth provision in a communication system

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Publication number Priority date Publication date Assignee Title
WO1995007578A1 (fr) * 1993-09-08 1995-03-16 Qualcomm Incorporated Procede et appareil de determination du debit de donnees transmises dans un systeme de communications a plusieurs utilisateurs
US5754541A (en) * 1994-06-20 1998-05-19 Nokia Telecommunications Oy Data transmission method, base station, and subscriber terminal
EP0767548A2 (fr) * 1995-10-05 1997-04-09 AT&T Corp. Système d'accès multiple par répartition de codes et service d'allocation à la demande des utilisateurs basé sur la charge et les interférences
WO1999009779A1 (fr) * 1997-08-20 1999-02-25 Qualcomm Incorporated Procede et appareil pour l'ordonnancement de la vitesse de liaison de retour
WO2001003357A1 (fr) * 1999-07-02 2001-01-11 Qualcomm Incorporated Procede et systeme pour determiner une vitesse de transmission par liaison inverse dans un systeme de communication sans fil

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006048631A1 (fr) * 2004-11-04 2006-05-11 Siemens Aktiengesellschaft Procede de commande d'un taux de transmission dans un terminal mobile lors d'un transfert intercellulaire sans coupure
US8744465B2 (en) 2005-06-16 2014-06-03 Qualcomm Incorporated Resource allocation method in a communication system
WO2008039034A2 (fr) * 2006-09-29 2008-04-03 Lg Electronics Inc. Procédé d'attribution de ressources à un canal de commande de liaison montante
WO2008039034A3 (fr) * 2006-09-29 2009-09-24 Lg Electronics Inc. Procédé d'attribution de ressources à un canal de commande de liaison montante
US7907567B2 (en) 2006-09-29 2011-03-15 Lg Electronics, Inc. Method for allocating resources to uplink control channel
KR101306728B1 (ko) * 2006-09-29 2013-09-10 엘지전자 주식회사 상향링크 제어채널에 대한 자원 할당 방법
US8953530B2 (en) 2006-09-29 2015-02-10 Lg Electronics Inc. Method for allocating resources to uplink control channel
US9794915B2 (en) 2006-09-29 2017-10-17 Lg Electronics Inc. Method for allocating resources to uplink control channel
US10624067B2 (en) 2006-09-29 2020-04-14 Lg Electronics Inc. Method for allocating resources to uplink control channel

Also Published As

Publication number Publication date
GB2363689A (en) 2002-01-02
AU6900001A (en) 2001-11-20
KR20020091282A (ko) 2002-12-05
BR0110525A (pt) 2003-04-08
JP2003533149A (ja) 2003-11-05
RU2002132893A (ru) 2004-04-20
CN1428065A (zh) 2003-07-02
EP1282998A1 (fr) 2003-02-12
GB0011114D0 (en) 2000-06-28

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