[go: up one dir, main page]

WO2001078423A1 - Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel - Google Patents

Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel Download PDF

Info

Publication number
WO2001078423A1
WO2001078423A1 PCT/US2000/009599 US0009599W WO0178423A1 WO 2001078423 A1 WO2001078423 A1 WO 2001078423A1 US 0009599 W US0009599 W US 0009599W WO 0178423 A1 WO0178423 A1 WO 0178423A1
Authority
WO
WIPO (PCT)
Prior art keywords
originating
cellular call
call
gsm
time delay
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.)
Ceased
Application number
PCT/US2000/009599
Other languages
English (en)
Inventor
John R. Doner
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.)
AirNet Communications Corp
Original Assignee
AirNet Communications Corp
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 AirNet Communications Corp filed Critical AirNet Communications Corp
Priority to PCT/US2000/009599 priority Critical patent/WO2001078423A1/fr
Priority to AU2000242275A priority patent/AU2000242275A1/en
Publication of WO2001078423A1 publication Critical patent/WO2001078423A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • This invention relates generally to time division multiple access (“TDMA”) cellular phone systems such as GSM-900, GSM-1900, and GSM-1800.
  • TDMA time division multiple access
  • the present invention relates to forward link power control for call origination in a TDMA cellular phone system.
  • a conventional cellular phone system 100 is shown in Fig.
  • the cellular phone system 100 includes a plurality of cells 110a, 110b, a mobile subscriber unit 120, a plurality of base transceiver stations (BTS) 105a,
  • BTS base transceiver stations
  • the cellular phone system 100 has a fixed number of channel sets distributed among the BTS 105a, 105b serving a plurality of cells 110a, 110b arranged in a predetermined reusable pattern.
  • the mobile subscriber unit 120 in a cell 110a or 110b, communicates with the BTS 105a or 105b via radio frequency (RF) means, specifically employing one of the fixed number of channels.
  • the BTS 105a, 105b communicate with the MTSO 130 via communication lines 140.
  • the MTSO 130 communicates with the switched telephone network 160 via the interface 150.
  • the cell areas typically range from 1 to 300 square miles.
  • the larger cells typically cover rural areas, and the smaller cells typically cover urban areas.
  • Cell antenna sites utilizing the same channel sets are spaced by a sufficient distance to assure that co-channel interference is held to an acceptably low level.
  • the mobile subscriber unit 120 in a cell 110a has radio telephone transceiver equipment which- communicates with similar equipment in BTS 105a, 105b as the mobile subscriber unit 120 moves within a cell or from cell to cell .
  • Each BTS 105a, 105b relays telephone signals between mobile subscriber units 120 and a mobile telecommunications switching office (MTSO) 130 by way of the communication lines 140.
  • MTSO mobile telecommunications switching office
  • Tl lines carry separate voice grade circuits for each radio channel employed at the cell site, and data circuits for switching and other control functions.
  • the MTSO 130 in Fig. 1 includes a switching network (not shown) for establishing call connections between the public switched telephone network 160 and mobile subscriber units 120 located in cell sites 110a, 110b and for switching call connections from one cell site to another.
  • the MTSO 130 includes a dual access feeder (not shown) for use in switching a call connection from one cell site to another.
  • Various handoff criteria are known in the art and utilize features such as phase ranging to indicate the distance of a mobile subscriber unit from a receiving cell site, triangulation, and received signal strength to indicate the potential desirability of a handoff.
  • a central processing unit (not shown) for processing data received from the cell sites and supervisory signals obtained from the switched telephone network 160 to control the operation of setting up and taking down call connections.
  • BTS broadband multicarrier amplifier
  • the transmission function of the BTS is supported by either by a single broadband multicarrier amplifier, which shares its total power among all subscribers, or by multiple broadband single carrier power amplifiers, each of which serves a single channel.
  • the BTS would share its power equally among all the subscribers in the cell site.
  • the BTS would provide constant transmit power to the mobile subscriber unit in the forward link (i.e., the base station to mobile transmit link) .
  • the BTS would transmit the same amount of power if the mobile subscriber unit was close to the BTS or if the mobile subscriber unit was at the cell boundary.
  • One of the reasons to implement this type of power control was the simplicity in the design of the BTS.
  • TDMA time division multiple access
  • a forward link control mechanism has been implemented to reduce co-channel interference.
  • forward link control provides additional benefits of improved efficiency in systems employing multi-carrier power amplifiers.
  • Current multi-carrier broadband amplifier technology places a premium on transmit power conservation, because the cost per watt for broadband multi -carrier amplifiers is quite high. In fact, for some cellular systems, power levels of 100 watts require combining or ganging together separate modules.
  • GSM Global System for Mobile
  • the forward link power control minimizes transmit power in the forward link direction by transmitting signals at the lowest possible level that maintains an acceptable signal quality.
  • the forward link power control also serves to minimize co-channel interference and to conserve power in both the mobile subscriber unit and the base transceiver stations.
  • the mobile subscriber unit continually measures the forward signal strength or signal quality (based on a bit-error rate) , and passes the information to the BTS or to the base station controller, which ultimately decides if and when the power level should be changed. Power levels may be stepped up or down in steps of 2 dBm from the peak power for the mobile subscriber unit to a minimum of 30 dB below peak power in a GSM cellular phone system for example.
  • the forward link power control capability is an essential tool for managing the resources for broadband base stations.
  • the forward link power control allows a BTS to manage the subscribers collectively in order not to exceed the capacity of the multi- carrier amplifiers of the BTS.
  • forward link power control cannot be applied to a newly originating call until the call is already established, due to latency in the process of determining forward link signal and call quality at the mobile subscriber unit.
  • This limitation requires that all new calls be started at full power, since there is no data initially available as to their distance from the base station. The power level can thereafter be adjusted downward, if possible, in the first few seconds of the call.
  • a broadband transceiver system estimates the distance of the mobile. subscriber unit from the BTS by measuring the time delay from the beginning of a control channel slot to the start of the notification message. In fact, all GSM systems perform this measurement in order to adjust the timing of the mobile subscriber unit transmission burst, to align the burst in the time slot of the TDMA RF signal.
  • the BTS derives an estimated distance to the mobile subscriber unit from the measured time delay. The estimated distance is used to determine an index. The power level is then assigned by selecting the lower of either the index plus a fixed integer or a known maximum value.
  • a controller in a BTS measures the time delay from the beginning of a control channel timeslot to the start of a notification message from a mobile subscriber unit.
  • An estimated distance is derived from the measured time delay. The estimated distance is used to determine an index.
  • the power level is then assigned by selecting the lower of either the index plus a fixed integer or a known maximum value .
  • Fig. 1 illustrates a conventional cellular phone system.
  • Fig. 2 illustrates a TDMA cellular phone system which includes a call origination which does not require full power in accordance with the principles of the present invention.
  • Fig. 3 is a block diagram of a BTS in the TDMA cellular phone system of Fig. 2.
  • Fig. 4 is a flow diagram of the call origination which does not require full power in accordance with the principles of the present invention.
  • Fig. 5 is an illustration of a look-up table used in Fig. 4.
  • the present invention provides for improved power management for a multi-carrier amplifier in a broadband transceiver system (BTS) .
  • BTS broadband transceiver system
  • the present invention provides for estimating the distance from a BTS to a mobile subscriber unit based on a measured time delay.
  • the time delay is measured from the leading edge of a timeslot in a control channel dedicated for uplink communications (from the mobile subscriber unit to BTS) .
  • the time delay is measured from the timing advance measurement performed from the random access control channel burst during call initiation.
  • the time delay is then used to estimate the distance of the mobile subscriber unit from the base station by dividing the time delay by the speed of light.
  • the estimated distance is then used to compute an index.
  • the index is used to assign a power level to the originating call by selecting the minimum between the index plus a fixed integer and a maximum value .
  • Fig. 2 shows a block diagram of a TDMA cellular phone system 200 that includes originating cellular calls which does not require full power in accordance to the principles of the present invention.
  • the TDMA cellular phone system 200 includes three groups: a mobile subscriber unit 210, a base station subsystem ("BSS")
  • BSS base station subsystem
  • the mobile subscriber unit 210 may referred to as a
  • the mobile subscriber unit 210 provides an interface for the subscriber to communicate with the TDMA cellular phone system 200.
  • the BSS 220 includes a base transceiver station (“BTS”), 225a or 225b and a base station controller (“BSC”) 230.
  • BTS base transceiver station
  • BSC base station controller
  • BTS 225a or 225b The functions of BTS 225a or 225b are to connect the mobile subscriber unit 210 to the TDMA cellular phone system 200.
  • the BTS 225a or 225b tasks further include channel coding/decoding and encryption/decryption.
  • BTS 225a or 225b comprises radio transmitters and receivers, antennas, and other equipment required for RF communication with mobile units.
  • the BTS 225a or 225b provides radio coverage for a specific geographical area called a cell. Multiple BTS are connected to and controlled by the BSC 230.
  • the BSS 220 provides for management of radio resources within either the BTS 225a, 225b or the BSC 230.
  • the mobile subscriber unit 210 normally sends a report of its received signal strength to the BSS 220 every 480 ms . With this information the BSS 220 manages such decisions as when to initiate handovers to other cells, change the BTS, 225a or 225b, adjust transmitter power, etc.
  • These functions can be performed in various manner as will be apparent to those skilled in the relevant art.
  • GSM specifies radio resource management as a BSC function, but GSM architecture permits many radio resource management tasks, such as initiation of handover, to be performed in the BTS .
  • the network subsystem 240 includes a mobile switching center
  • MSC mobile subscriber unit 245, a home location register (“HLR”) 250, a visitor location register (“VLR”) 255, authentication center (“AuC”) 260, an equipment identity register (“EIR”) 265, and an operation and maintenance center (“OMC”) 270.
  • the MSC 245 provides for registration, authentication, location updating, handovers, and call routing to a roaming subscriber. With respect to the mobile subscriber unit 210, the
  • MSC 245 acts like a standard exchange in a fixed network and additionally provides all the functionality needed to handle a mobile subscriber.
  • the MSC 245 may also have a gateway function for communicating with other networks.
  • the HLR 250 maintains a database used for management of mobile subscribers. For each mobile unit 210 the HLR 250 stores the IMSI, mobile subscriber unit 210 ISDN number and current visitor location register ("VLR") address. Generally, the information stored in the HLR 250 concerns the location of each mobile subscriber unit 210, information that is necessary to be able to route calls to each mobile subscriber unit 210 managed by the HLR 250. The HLR 250 also maintains the services associated with each mobile subscriber unit 210. One HLR may serve several MSCs .
  • the VLR 255 informs the MSC 245 of the current location of the mobile subscriber unit 210. • The VLR 255 also provides selected administrative information from the HLR 250, necessary for call control and provision of the subscribed services, for each mobile subscriber unit 210 that is located in a cell controlled by the VLR 255.
  • the VLR 255 is connected to one MSC 245 and is normally integrated into the MSC 245 hardware.
  • the AuC 260 maintains a protected database that holds a copy of the secret electronic "key" that is stored in each subscriber's SIM card. The key is used for authentication and encryption over the radio channels. In this manner, the AuC 260 provides additional security against fraud. It is normally located close to each HLR 255 within the TDMA cellular phone system 200.
  • the EIR 265 maintains a database of all valid mobile subscriber unit 210 equipment within the TDMA cellular phone system 200. Each mobile subscriber unit 210 is identified by its
  • the EIR 265 includes three subsidiary databases: (1) a
  • the OMC 270 directs the management system that oversees the functions of the TDMA cellular phone system 200.
  • the OMC 270 assists a network operator in maintaining satisfactory operation of the TDMA cellular phone system 200.
  • Hardware redundancy and intelligent error detection mechanisms contained in OMC 270 help prevent network down time.
  • the OMC 270 is responsible for controlling and maintaining the MSC 245, the BSC 230, and BTS
  • the OMC 270 may also be in charge of an entire public land mobile network or just some parts of the public land mobile network.
  • the TDMA cellular phone system 200 may operate with several different but related network protocols, including the three variants of the Global System for Mobile Communication (GSM) : GSM-900, GSM-1900, or GSM-1800. Although the present invention is embodied with the GSM-900, GSM-1900, or GSM-1800 network protocols, the present invention is applicable to other TDMA network protocol systems .
  • GSM Global System for Mobile Communication
  • the present invention is part of a digital multi-carrier broadband wireless transceiver system (BTS) of the TDMA cellular phone system 200.
  • Fig. 3 illustrates a block diagram of the BTS of the TDMA cellular phone system 200 which includes the present invention of call origination without requiring full power.
  • BTS digital multi-carrier broadband wireless transceiver system
  • the modern digital ulti-carrier broadband wireless transceiver system (BTS) 300 includes a network interface module 310, a digital signal processing (DSP) module 320, a combiner module 330, channelizer modules 340a, 340b, a broadband RF transceiver 350, a multi-carrier power- amplifier (MCPA) 360, a central processing unit 370, and a memory 380.
  • the BTS 300 may employ multiple single carrier power amplifiers (SCPA) in lieu of a single MCPA 360.
  • SCPA single carrier power amplifiers
  • the network interface module 310 provides a connection between the BTS 300 and a MTSO.
  • the network interface module 310 provides ninety-two (92) 16 kbps subrate voice channels.
  • the network interface module 310 is also interfaced with the DSP module 320.
  • the DSP module 320 provides for channel coding and modulation of thirteen (13) kbps voice channel data from the network interface module 310.
  • the DSP module 320 multiplexes eight (8) channels into a single baseband signal for upconversion to an intermediate frequency (IF) and for combining with other RF carriers by the combiner module 330.
  • the DSP module 320 also provides the equalization, demodulation and channel decoding from received channels of RF carriers that have been downconverted to a baseband signal by the channelizer modules 340a, 340b.
  • the combiner module 330 receives the 'baseband RF carriers from the DSP module 320. Each RF carrier is filtered and upconverted to a unique intermediate frequency (IF) . All of the
  • RF carriers in a five (5) MegaHertz (MHz) bandwidth are simultaneously combined into a single composite IF signal.
  • This digital IF signal is then transferred to the broadband RF transceiver 350.
  • the channelizer modules 340a, 340b receive a digital composite IF signal from the broadband RF transceiver 350.
  • the digital composite IF signal consists of all twenty-five (25) of the 200-kiloHertz (kHz) RF carriers in a 5 MHz bandwidth.
  • the channelizer modules 340a, 340b filter and downconvert each RF carrier to a baseband signal for processing by the DSP module 320.
  • the broadband RF transceiver 350 converts the digital signals for transmission to mobile subscriber units.
  • the broadband RF transceiver 350 also converts received analog signals to digital signals for processing by the BTS 200.
  • the MCPA 360 is typically an ultra-linear, multi-carrier, high power amplifier.
  • the MCPA 360 receives a composite broadband signal from the broadband RF transceiver 350 and provides as much as 48dB of gain.
  • the power output of individual RF carriers are determined by downlink power control algorithms entirely within the broadband RF transceiver 350.
  • the CPU 370 hosts all of the BTS 300 low level control, call processing, and operation and maintenance application software which includes the software embodiment of the present invention of cellular call origination without requiring full power.
  • the memory 380 includes non-volatile memory storage of the real-time operating system and application software.
  • the application software that is stored in memory 380 includes the present invention of call origination without requiring full power.
  • the BTS 300 includes the present invention which is based on determining the distance of the mobile subscriber unit from the BTS 300.
  • the primary variable dictating the transmit power requirement for call origination is the distance between a BTS and a mobile subscriber unit.
  • a new call may be assigned the correct power at call origination provided that an approximation of the distance was available.
  • TDMA protocols such as the GSM-based protocols in fact support such an estimation, because of certain synchronization mechanisms required for the TDMA aspect of the GSM-based protocols .
  • a single RF (radio frequency) carrier in GSM supports eight simultaneous calls, each broadcasting for a short burst of time in a repeating cycle.
  • the individual transmit time of a single caller is called a time slot, and eight consecutive time slots are called a frame.
  • the frames represent contiguous periodic repetitions of the eight time slots, and to avoid interference between mobiles sharing an RF carrier, each mobile on a specific carrier transmits only during its assigned time slot .
  • Implicit in the TDMA scheme is the need for synchronization: the distinct mobiles sharing an RF carrier must be operating with a common clock in order collectively to honor the time slot boundaries.
  • This common clock is derived from the common forward link data stream that they share, which is likewise divided into frames and time slots.
  • each mobile tracks the beginnings of frames, and can offset its own uplink transmission by the amount necessary to synchronize with the tracked frames.
  • tracking the downlink clock is not adequate for full synchronization, because mobile subscriber units are at different distances from the BTSs. A mobile subscriber unit farther from the BTS receives the downlink timing data later than a mobile close to the BTS, and its uplink signal back to the base station likewise takes longer to arrive.
  • mobile subscriber units Using only the downlink timing data, mobile subscriber units would operate with the risk of interference resulting from overlapping time slot data bursts on uplink transmissions, especially in circumstances where a more distant mobile occupies an adjacent time slot preceding the time slot of a closer mobile.
  • GSM provides a mechanism called the timing advance to prevent this. In effect, on the first contact with the BTS
  • each mobile transmits a short data burst in the Random Access Channel ("RACH"), and does so using its local estimate of the base station clock as received on the downlink control channel.
  • RACH Random Access Channel
  • the distance of the mobile unit from the BTS can then be approximated by the base station by measuring the time delay of the mobile burst from the leading edge of the RACH time slot.
  • This distance estimate can support a means to assign an initial power level for the forward link supporting the new call.
  • Other factors can be considered to determine the reliability of this metric.
  • the linearity of the distance between the mobile unit and the BTS is not perfect : The mobile may be shadowed by an obstruction, such that there may be a delayed reflected signal or multipath component which is stronger than the direct signal component that is attenuated by the obstruction. However, this effect serves only to increase the distance estimate, since the reflected signal path is necessarily longer than the direct signal path. Therefore, the initial
  • Fig. 4 illustrates a flow diagram of call origination without requiring full power in accordance with the principles of the present invention in the TDMA cellular phone system 200.
  • the BTS 300 receives a signal to initiate a call from the mobile subscriber unit 210.
  • the mobile subscriber unit will notify the BTS 300 over the RACH channel.
  • the RACH channel is a control channel that is specifically reserved for mobile subscriber units to notify a BTS about initiating call processing.
  • the RACH channel is divided into timeslots where the mobile subscriber units will notify the BTS by a notification message within a single timeslot.
  • the BTS 300 measures the time delay, t dl , between the beginning of the RACH timeslot and the actual request for call origination signal by the mobile subscriber unit.
  • step 420 the measured time delay, t dl , is converted to an estimated distance, D est , by dividing the time delay, t d , by the speed of light, c, illustrated by equation (1) :
  • step 430 the D est is used to determine a distance index
  • the look-up table is initially determined during the setup of the cell site. For each N power level of a given cell site, P N , a corresponding maximum distance, D., is determined for each power level .
  • D x should ideally be based on the initial design measurements made in support of the cell site.
  • a corresponding index is also determined for the look-up table.
  • distance index J is retrieved from the look-up table based on the following equation
  • the index J is the minimum value of i for which D est is less than or equal to D where i represents a specific one of N power levels in a given cell.
  • the distance index, J is chosen to be the highest value, N.
  • a power level index L is determined by selecting the lower of either J " plus a fixed integer K, or N.
  • the fixed integer, K is chosen to be greater than zero.
  • the fixed integer, K provides for an error margin on the conservative side, allowing assignment of a power level higher than that dictated solely by the estimated distance from the mobile subscriber unit.
  • K is preferably cellsite specific, based on the known propagation characteristics of the cell site, and other knowledge concerning terrain, obstructions, etc.
  • the power level index L is then used to address the look-up table of Fig. 5 to determine the appropriate power level.
  • the power level is then assigned by the BTS 300 to the call initiated by the mobile subscriber unit.

Landscapes

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

Abstract

L'invention concerne un procédé et un appareil permettant le lancement d'un appel, sans la nécessité d'une pleine puissance, dans un système de téléphonie cellulaire à accès multiple par répartition dans le temps (AMRT) (fig. 2, fig. 4). Une temporisation est mesurée (410) du début d'un intervalle de temps, comprenant une demande (400) d'établissement de communication, jusqu'au début de ladite demande (400). Une estimation de distance est obtenue à partir de la temporisation (420). Ladite estimation de distance est utilisée pour la consultation d'une table de recherche afin de parvenir à un indice de distance (430). Un indice de niveau de puissance (440) est obtenu par sélection de la valeur la plus basse entre l'indice de distance minimal (430) plus un entier fixe et une valeur maximale. L'entier fixe est une valeur supérieure à zéro et est basé sur les caractéristiques de propagation de la cellule spécifique. La valeur maximale représente le niveau de puissance qui maintiendra une qualité de signal acceptable au niveau d'une limite de station cellulaire. Ledit indice de niveau de puissance (440) est ensuite utilisé pour la consultation de la table de recherche afin de parvenir au niveau de puissance attribué (450).
PCT/US2000/009599 2000-04-11 2000-04-11 Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel Ceased WO2001078423A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US2000/009599 WO2001078423A1 (fr) 2000-04-11 2000-04-11 Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel
AU2000242275A AU2000242275A1 (en) 2000-04-11 2000-04-11 Method and apparatus for originating gsm-900/gsm-1900/gsm-1800 cellular calls without requiring full power at call initiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/009599 WO2001078423A1 (fr) 2000-04-11 2000-04-11 Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel

Publications (1)

Publication Number Publication Date
WO2001078423A1 true WO2001078423A1 (fr) 2001-10-18

Family

ID=21741255

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/009599 Ceased WO2001078423A1 (fr) 2000-04-11 2000-04-11 Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel

Country Status (2)

Country Link
AU (1) AU2000242275A1 (fr)
WO (1) WO2001078423A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004027528A3 (fr) * 2002-09-20 2004-08-05 Koninkl Philips Electronics Nv Circuit de traitement de donnees adaptatif en fonction d'une estimation de retard
EP2079266A3 (fr) * 2008-01-10 2010-12-29 Ricoh Company, Ltd. Appareil de communication, procédé de communication et produit de programme informatique
EP1986343A3 (fr) * 2007-04-27 2011-05-04 NEC Corporation Procédé de contrôle et dispositif pour liaison montante d'accès de puissance de transmission dans un système de communication radio
US8552903B2 (en) 2006-04-18 2013-10-08 Qualcomm Incorporated Verified distance ranging
KR101340187B1 (ko) * 2006-04-14 2013-12-10 퀄컴 인코포레이티드 거리 기반 보안
US8837724B2 (en) 2007-03-27 2014-09-16 Qualcomm Incorporated Synchronization test for device authentication
US8886125B2 (en) 2006-04-14 2014-11-11 Qualcomm Incorporated Distance-based association
US9141961B2 (en) 2007-06-20 2015-09-22 Qualcomm Incorporated Management of dynamic mobile coupons
US9215581B2 (en) 2006-04-14 2015-12-15 Qualcomm Incorported Distance-based presence management
US9483769B2 (en) 2007-06-20 2016-11-01 Qualcomm Incorporated Dynamic electronic coupon for a mobile environment
US9524502B2 (en) 2007-06-20 2016-12-20 Qualcomm Incorporated Management of dynamic electronic coupons
US10542372B2 (en) 2011-03-15 2020-01-21 Qualcomm Incorporated User identification within a physical merchant location through the use of a wireless network

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250665A (en) * 1990-10-17 1992-06-10 Northern Telecom Ltd Improved call set-up in a radio communication system with dynamic channel allocation
US5987099A (en) * 1992-10-16 1999-11-16 Northern Telecom Limited Low-power wireless system for telephone services
US6058107A (en) * 1998-04-08 2000-05-02 Motorola, Inc. Method for updating forward power control in a communication system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2250665A (en) * 1990-10-17 1992-06-10 Northern Telecom Ltd Improved call set-up in a radio communication system with dynamic channel allocation
US5987099A (en) * 1992-10-16 1999-11-16 Northern Telecom Limited Low-power wireless system for telephone services
US6058107A (en) * 1998-04-08 2000-05-02 Motorola, Inc. Method for updating forward power control in a communication system

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004027528A3 (fr) * 2002-09-20 2004-08-05 Koninkl Philips Electronics Nv Circuit de traitement de donnees adaptatif en fonction d'une estimation de retard
US7246251B2 (en) 2002-09-20 2007-07-17 Nxp B.V. Adaptive data processing scheme based on delay forecast
CN100414941C (zh) * 2002-09-20 2008-08-27 Nxp股份有限公司 基于延迟预报的自适应数据处理方案
US9591470B2 (en) 2006-04-14 2017-03-07 Qualcomm Incorporated System and method for enabling operations based on distance to and motion of remote device
US9510383B2 (en) 2006-04-14 2016-11-29 Qualcomm Incorporated System and method of associating devices based on actuation of input devices and signal strength
US9215581B2 (en) 2006-04-14 2015-12-15 Qualcomm Incorported Distance-based presence management
US8886125B2 (en) 2006-04-14 2014-11-11 Qualcomm Incorporated Distance-based association
KR101340187B1 (ko) * 2006-04-14 2013-12-10 퀄컴 인코포레이티드 거리 기반 보안
KR101353894B1 (ko) 2006-04-14 2014-01-22 퀄컴 인코포레이티드 거리 기반 보안
US8552903B2 (en) 2006-04-18 2013-10-08 Qualcomm Incorporated Verified distance ranging
US8837724B2 (en) 2007-03-27 2014-09-16 Qualcomm Incorporated Synchronization test for device authentication
US8046020B2 (en) 2007-04-27 2011-10-25 Nec Corporation Control method and device of uplink access transmission power in radio communications system
EP1986343A3 (fr) * 2007-04-27 2011-05-04 NEC Corporation Procédé de contrôle et dispositif pour liaison montante d'accès de puissance de transmission dans un système de communication radio
US9141961B2 (en) 2007-06-20 2015-09-22 Qualcomm Incorporated Management of dynamic mobile coupons
US9483769B2 (en) 2007-06-20 2016-11-01 Qualcomm Incorporated Dynamic electronic coupon for a mobile environment
US9524502B2 (en) 2007-06-20 2016-12-20 Qualcomm Incorporated Management of dynamic electronic coupons
US9747613B2 (en) 2007-06-20 2017-08-29 Qualcomm Incorporated Dynamic electronic coupon for a mobile environment
US8000658B2 (en) 2008-01-10 2011-08-16 Ricoh Company, Limited Communicating apparatus, communicating method, and computer program product
EP2079266A3 (fr) * 2008-01-10 2010-12-29 Ricoh Company, Ltd. Appareil de communication, procédé de communication et produit de programme informatique
US10542372B2 (en) 2011-03-15 2020-01-21 Qualcomm Incorporated User identification within a physical merchant location through the use of a wireless network

Also Published As

Publication number Publication date
AU2000242275A1 (en) 2001-10-23

Similar Documents

Publication Publication Date Title
US5930248A (en) Radio communication system selectively using multicast with variable offset time
JP3966369B2 (ja) Ｃｄｍａ無線加入者網システムの順方向トラヒックチャンネル電力制御方法及びその装置
FI96157B (fi) Digitaalinen, solukkorakenteinen aikajakokanavointiin perustuva radiopuhelinverkko radioyhteyden siirtämiseksi tukiasemalta uudelle tukiasemalle
EP0709015B1 (fr) Commande de transfert et de puissance de transmission d'une station mobile dans un systeme de telecommunications mobile
US6298095B1 (en) Communicating signaling information in a cellular system that has a tight frequency reuse pattern
US7085570B2 (en) Handover method, system and radio network controller
KR100722067B1 (ko) 다운링크 전송 전력 제어 방법
US6246886B1 (en) System and methods for controlling access to digital wireless network in a dual mode wireless system
US8184596B2 (en) Resource allocation and network sharing between a multiple of 3G-service providers
EP1032995A1 (fr) Techniques de selection de reseau de radiodiffusion pour systemes de radiocommunication hybrides comprenant a la fois un systeme de communication cellulaire et un systeme de radiodiffusion
JP2003515298A (ja) 移動通信システム間のハンドオーバを改善する方法
JP2001036949A (ja) 無線通信方法および無線通信システム
US20130242791A1 (en) Method and apparatus for controlling the transmission power of a base station in a wireless communication system
WO2001078423A1 (fr) Procede et appareil pour etablir des appels cellulaires gsm-900/gsm-1900/gsm-1800 sans la necessite d'une pleine puissance au lancement d'appel
US6545990B1 (en) Method and apparatus for a spectrally compliant cellular communication system
US7319883B2 (en) Method and apparatus for determining a transmit power
US6442402B2 (en) Method and radio communication system for data transmission
EP1195920B1 (fr) Procédé de détermination de la puissance initiale d'emission
WO2002032011A1 (fr) Procedes et agencement relatifs a un systeme de radiocommunication
US6370157B2 (en) Automatic frequency control for a cellular base station
MXPA98009056A (en) Soft transfer inter-systems supporting inter-siste calls

Legal Events

Date Code Title Description
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 CR CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN 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 ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ 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
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP