WO2003094541A1 - Transferts de connexions d'equipements utilisateurs dans des systemes de communications sans fil - Google Patents

Transferts de connexions d'equipements utilisateurs dans des systemes de communications sans fil Download PDF

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Publication number
WO2003094541A1
WO2003094541A1 PCT/IB2003/001520 IB0301520W WO03094541A1 WO 2003094541 A1 WO2003094541 A1 WO 2003094541A1 IB 0301520 W IB0301520 W IB 0301520W WO 03094541 A1 WO03094541 A1 WO 03094541A1
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WO
WIPO (PCT)
Prior art keywords
frequency
downlink
connection
uplink
accordance
Prior art date
Application number
PCT/IB2003/001520
Other languages
English (en)
Inventor
Uwe Schwarz
Peter Muszynski
Kari Rikkinen
Original Assignee
Nokia Corporation
Nokia 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 Nokia Corporation, Nokia Inc. filed Critical Nokia Corporation
Priority to EP03715202A priority Critical patent/EP1502451A4/fr
Priority to AU2003219391A priority patent/AU2003219391A1/en
Publication of WO2003094541A1 publication Critical patent/WO2003094541A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H04B17/327—Received signal code power [RSCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/354—Adjacent channel leakage power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/20—Performing reselection for specific purposes for optimising the interference level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the present invention generally relates to wireless communications. More particularly, the invention relates to handovers of user equipment (UE) under the control of a radio network controller (RNC) in a wireless communications system.
  • UE user equipment
  • RNC radio network controller
  • soft handovers are used to gradually transfer a user equipment (UE) connection from one base station to another base station without the user experiencing any interruption in communications.
  • Hard handovers are used to, for example, switch between modes of operations or switch between base stations when a soft handover cannot be performed.
  • inter-frequency hard handovers are used to hand over the connection between the UE and the radio access network from one frequency carrier or band to another. Although it may not always be apparent to the user, hard handovers typically involve some interruption in the connection between the UE and the base station(s).
  • the connection between the UE and the radio access network includes an uplink (UL) connection on a first carrier frequency and a downlink (DL) connection on a second carrier frequency different than the first carrier frequency.
  • the UL connection may be with a first base station that is independent from a second base station used for the DL connection.
  • DL downlink
  • GSM Global System for Mobile Communications
  • IS-95 are fixed duplex systems in which both of the UL and DL connections are with the same base station and use one of a plurality of predetermined duplex UL-DL pairs.
  • Each 1 :1 pair of UL and DL carriers has a constant, fixed offset between the UL and DL frequencies to prevent interference between base stations and between user equipment.
  • the radio network controller When the radio network controller wishes to perform an inter-frequency hard handover for a particular UE for any reason (such as interference, load, etc.), it identifies a new UL-DL duplex pair and the UL and DL frequencies for that particular
  • the UE are changed in tandem at the same time to the new UL-DL duplex pair. This handover procedure is performed and the entire duplex pair is changed even if it is only desired to change only one of the UL frequency or the DL frequency. It is not possible, for example, to keep the uplink connection uninterrupted and change only the downlink connection.
  • FIG. 1 illustrates the inter-frequency hard handover procedure performed in a network according to Release 4 of the specifications developed by the 3rd Generation Partnership Project (www.3qpp.org). See section 7.11 of 3GPP
  • the inter-frequency hard handover procedure includes a
  • FIG. 2 illustrates the messages taken by the UE in the inter-frequency hardhandover. See also section 8.2.2 of 3GPP 25.331 v4.1.0 (2001-06).
  • Prior art Fig. 2 illustrates the messages taken by the UE in the inter-frequency hardhandover. See also section 8.2.2 of 3GPP 25.331 v4.1.0 (2001-06).
  • Prior art Fig. 2 illustrates the messages taken by the UE in the inter-frequency hardhandover. See also section 8.2.2 of 3GPP 25.331 v4.1.0 (2001-06).
  • Prior art Fig. 2 illustrates the messages taken by the UE in the inter-frequency hardhandover. See also section 8.2.2 of 3GPP 25.331 v4.1.0 (2001-06).
  • Prior art Fig. 2 illustrates the messages taken by the UE in the inter-frequency hardhandover. See also section 8.2.2 of 3GPP 25.331 v4.1.0 (2001-06).
  • the preferred embodiments allow the UL connection to be maintained and remain uninterrupted while only the DL connection is changed and resynchronized to a new carrier frequency.
  • the preferred embodiments overcome the problems associated with the unnecessary allocation of a carrier frequency which does not change in the handover procedure
  • a first aspect of the invention concerns a method of executing an inter- frequency handover of a UE connection in which the frequency of the uplink connection from the UE to a base station remains the same and the frequency of the downlink connection from said base station to said UE changes from a first downlink frequency to a second downlink frequency, comprising: transmitting a request for said handover from said base station, the request containing information indicating the second downlink frequency and information indicating that the uplink frequency remains the same; and in response to the request, maintaining the physical layer of the uplink connection while changing the downlink frequency from said first downlink frequency to said second downlink frequency.
  • a second aspect of the invention concerns a method of executing an inter- frequency handover of a UE connection in which the frequency of the downlink connection from the UE to a base station remains the same and the frequency of the uplink connection from said base station to said UE changes from a first uplink frequency to a second uplink frequency, comprising transmitting a request for said handover from said base station, the request containing information indicating the second uplink frequency and information indicating that the downlink frequency remains the same; and in response to the request, maintaining the physical layer of the downlink connection while changing the uplink frequency from said first uplink frequency to said second uplink frequency.
  • a third aspect of the invention concerns a method of triggering an inter- frequency handover of a UE connection in which the frequency of the uplink connection from the UE to a base station remains the same and the frequency of the 0173.41821 A00 NC35798PCT downlink connection from said base station to said UE changes from a first downlink frequency to a second downlink frequency, comprising directly measuring the signal strength of an adjacent uplink carrier; determining the presence of interference from the adjacent uplink carrier on the basis of said measurement; if it is determined that interference is present on the adjacent uplink carrier, transmitting a request for said handover from said base station, the request containing information indicating the second downlink frequency and information indicating that the uplink frequency remains the same; and in response to the request, maintaining the physical layer of the uplink connection while changing the downlink frequency from said first downlink frequency to said second downlink frequency.
  • FIG. 1 illustrates the steps performed by a UTRAN network according to a prior art inter-frequency hard handover procedure.
  • Fig. 2 shows the steps taken by a UE according to the prior art inter- frequency hard handover procedure shown in Fig. 1. 0173.41821A00 NC35798PCT
  • FIG. 3 illustrates an exemplary 3GPP wireless communication system in which the preferred embodiments of the invention may be practiced.
  • Fig. 4 is a flowchart indicating the steps of the handover procedure according to the preferred embodiment of the invention.
  • Fig. 5 illustrates the allocation of a proposed extension band to which the preferred embodiment may be applied.
  • Fig. 6 illustrates a second allocation scenario of a proposed extension band.
  • Fig. 7 illustrates the problem of UE-UE interference.
  • Fig. 8 illustrates a method of detecting adjacent channel interference to trigger an interference escaping handover.
  • FIG. 3 is a block diagram of the architecture of an exemplary 3GPP wireless communication system.
  • First user equipment (UE) 11 and second UE 12 are connected via a Uu radio interface to respective first and second base stations
  • UTRAN 40 includes at least one base station controller 30 (called a Radio Network Controller (RNC) in 3GPP specifications) connected to the base station 21 , 22 via a lub interface and is responsible for the management and the control of the radio resources in its domain (i.e., the base station controllers 21 , 22 connected to it).
  • RNC 30 may be a service access point for all services the UTRAN 40 provides to a core network (not shown).
  • Fig. 3 also shows a second RNC 35 connected to base stations 23 and 24 via the lub interface.
  • RNC 30 An lur interface is provided between RNC 30 and RNC 35.
  • RNC 35 An lur interface is provided between RNC 30 and RNC 35.
  • RNC 30 For ease of illustration, only two base station controllers are shown in Fig. 3. There may, of course, be any number of base stations and base station controllers in a mobile communication system. 0173.41821 A00 NC35798PCT
  • RANAP is a signalling protocol in the lu-interface that contains all control information specified for the Radio Network Layer used for UTRAN-related issues.
  • the RRC management of RNC 30 can independently indicate the new target channel frequencies for the uplink and downlink in a handover.
  • the RRC signaling message may contain separate information elements which respectively indicate the uplink frequency, the downlink frequency, etc.
  • 3GPP TS 25.331 v4.1.0 states that UE 11 should perform physical channel reconfiguration procedure A set forth in Section 4.3.2.3 of 3GPP TS 25.214 when making an inter-frequency hard handover. Applying this procedure to cases where only the downlink is changed, the procedure requires the UE 11 to terminate the downlink transmission, tune in to the new downlink frequency and try to synchronize to it. However, UE 11 must first interrupt the uplink connection and must not transmit on the uplink connection while this is being done. Thus, the inter-frequency hard handover always, by default, leads to an interruption on the uplink. Node B 21 must reacquire the uplink connection after the UE 11 starts transmitting again on the uplink connection. 0173.41821A00 NC35798PCT
  • the order of steps in the previous handover procedure is that the network starts downlink transmission on the new downlink frequency, UE 11 stops transmission on the uplink connection and tries to synchronize to the new downlink connection. Once UE 11 has found the new downlink connection and verified that the downlink connection is operating properly, it may then resume transmissions on the uplink connection and the base station 21 tries to reacquire the uplink transmission from UE 11 and if the uplink transmission is found, base station 21 provides signaling back to UE 11 confirming the uplink transmission.
  • the 3GPP specifications do not account for the special case where frequency and other parameters of either the uplink connection or the downlink connection remains the same during the inter-frequency handover.
  • the network whenever one of the uplink or downlink frequencies is changed, by default, the network must perform the specified inter-frequency hard handover procedure. There is no way to avoid the additional unnecessary steps in the procedure.
  • the current 3GPP specifications do not indicate what happens if one of the uplink or downlink remains the same.
  • There is only a single hard handover procedure which is invoked whenever at least one of the uplink or downlink frequencies needs to be changed. Once the hard handover procedure is invoked and starts, it is always the same and the same steps are included in it.
  • the network sets up new physical resources on Node B 21 for the new uplink and downlink transmissions and then signals the UE 11 to go to the new frequencies.
  • the synchronization process starts where the UE 11 tries to establish the new downlink 0173.41821A00 NC35798PCT connection, interrupts the uplink connection and the network searches for the uplink connection, etc. In the network signaling, new resources will be setup for the uplink connection even if the frequency remains the same and it is possible to use the old physical resources.
  • the preferred embodiments of the invention provide a handover procedure which, in cases where only one of the frequency for the downlink connection is changed, the uplink connection is maintained during the handover so that the physical layer of the connection is not disrupted or terminated.
  • the physical hardware resources of the base station remain allocated to the uplink connection.
  • the base station remains capable of receiving transmissions on the uplink connection at the physical layer even though the UE may not be transmitting.
  • Fig. 4 is a flowchart illustrating the general steps of the handover procedure applicable to the preferred embodiments of the invention.
  • the handover request contains two separate items of information. First information indicating that the uplink frequency remains the same and second information indicating the new downlink frequency. As explained, the physical layer of the uplink is maintained (402) at the same time that the downlink frequency is changed (403).
  • UE 11 is resynchronized to the new downlink connection (406).
  • UE 11 is resynchronized to the new downlink connection using the same synchronization procedure already established for other 0173.41821A00 NC35798PCT procedures in UE 11. This synchronization procedure may be that described in U.S.
  • the handover may apply an optimized power control feature to minimize the recovery period after this downlink transmission gap.
  • the handover optimized power control feature may be similar to known compressed mode power control mechanisms or it may be quite different. For example, if transmissions from
  • the network may estimate changes in radio propagation to allow a faster adoption to optimal working of the feedback loop.
  • the interruption time in a handover according to the preferred embodiments is shorter compared to the conventional inter-frequency handover and the pathloss of target cell is known because the base station is co-sited.
  • the new downlink connection will have a new chip synchronized signal from the base station and the UE 11 has to be resynchronized with the new signal.
  • the resynchronization of the downlink connection follows the same rules for asynchronous base stations established in 3GPP TS 25.214. In particular, it uses 0173.41821A00 NC35798PCT the system frame number (SFN) timing method to accomplish the resynchronization.
  • SFN system frame number
  • GPS Global Position System
  • the SFN is used when making handovers between different cells to determine the drift between the base stations. Signaling information is then sent back to the network so that it positions the frame boundaries accordingly and the UE can demodulate transmissions on the downlink connection.
  • transmissions on the uplink connection remain possible during and shortly after the time period in which the downlink connection is interrupted and changed.
  • the uplink transmissions may continue or pause (this option may be set by the UE or the network), but they will not be fully functional and will be affected by the missing feedback loop in the downlink connection used, for example, for power control.
  • the options for uplink transmission during this time period may be set by the UE or the network or by some coordination of both.
  • a first option is to interrupt the uplink transmission, preferably similar to the manner in which this is done during a compressed mode gap.
  • a second option is to continue uplink transmissions, preferably similar to the manner done for only downlink compressed mode gap.
  • UE 11 skips extra downlink measurements before these uplink transmissions. 0173.41821A00 NC35798PCT
  • radio link (RL) failure message is preferably prevented.
  • a number of out- of-sync indications which is relatively high compared to the number of out-of-sync indications which would normally be tolerated.
  • N_OUTSYNC_IND 1..256 frames, i.e. up to 2.56 seconds
  • the handover is accomplished more quickly than previous handover procedures.
  • the physical layer of the uplink connection doesn't need to be terminated and transmissions can continue on the uplink connection.
  • the new downlink connection is available more quickly and power control of the uplink connection can resume as soon as synchronization of the new downlink connection is achieved.
  • power control of the downlink on the new carrier frequency can start as soon as downlink synchronization is achieved - with no downlink measurement before uplink transmission.
  • the power control preamble can be replaced by a power recovery algorithm. Unlike the previous handover procedure, no new uplink channel estimation is needed.
  • the handover procedure is advantageously applied to additional available frequency spectrum.
  • 0173.41821A00 NC35798PCT among new extension bands being discussed is an extension band between 2500 and 2690 MHz identified as ITU S5.AAA in Fig. 5. Different scenarios for use of this additional extension band are possible. Noting that the extension band is not wide enough to support multiple duplex pairs having the conventional duplex separation of
  • a first scenario is that all of the carriers in the extension band are used only for additional downlink carriers.
  • UE connections pertaining to one particular core band UL carrier can be carried on one or more than one DL carrier.
  • each radio link uses at most one carrier (either in one of the core bands or in the extension band) at any point in time.
  • variable duplexing in the UE is used to access the additional DL carrier(s) in the extension band outside the core bands.
  • the handover according to the above embodiments may be applied, along with variable duplex technology, to change the downlink frequency from the core band to the extension band.
  • a second scenario illustrated in Fig. 6 it is proposed that there be a plurality of sub-bands for UL and DL carriers which are adjacent to each other in the extension band. It is assumed that the (missing) UL part to the FDD (external) DL carriers within the extension band is implemented by using UL carriers from the core bands and variable duplexing. Thus, only existing UMTS core band operators will be able to use that part of the extension band.
  • the UL/DL "internal portions" of the spectrum shall be used by, for example, new (or also possible existing) operators autonomously, i.e., without the necessity to use core band carriers.
  • the new extension band can be used by UTRAN for load balancing or coverage.
  • the inter-frequency band handovers 0173.41821 A00 NC35798PCT become essential for efficient operation and use of the spectrum.
  • the handover according to the preferred embodiment can be used as an effective interference escape mechanism in the second scenario since it is faster than the previous handover procedures.
  • This handover may be triggered by a unique method to detect UE to UE adjacent channel interference.
  • Such an interference can happen at the border between FDD UL (internal) and FDD DL (external).
  • This interference does not occur in conventional fixed duplex wireless communication systems because the fixed distance between the carriers avoided the problem.
  • the interference is small enough not to be identified as a dead zone area by current methods, but it is large enough to cause inefficient use of base station resources.
  • Adjacent UE-UE interference can potentially create a large area of interference due to the fact that there are many mobiles i.e. many sources of interference. Thus, the number of significantly interfered mobiles can also be high summing up the inefficient use of base station resources.
  • Early detection of UE to UE interference and subsequent handovers therefore improves spectral efficiency.
  • a first UE 12 transmitting in an uplink carrier frequency adjacent to the downlink carrier frequency of another UE 11 can interfere with that adjacent downlink frequency and possibly create dead zones.
  • the result will be inefficient use of base station resources, i.e. additional base station transmission power, before the dead zone is reached.
  • the UE 11 can not distinguish the dead zone from the edge of the base station's cell.
  • the inefficient use of base station resources around the dead zones is 0173.41821A00 NC35798PCT easily avoided by performing a handover to a non-interfered downlink carrier according to the preferred embodiments.
  • Efficient use of base station resources allows high throughput and signal-to-interference ratio in packet switched services.
  • a variant of compressed mode measurement can be made to detect the interference and trigger an interference escaping handover, but a preferred method is shown in Fig. 8.
  • the preferred trigger method for the handover consists of separate UE measurements directly on the adjacent UL carrier(s).
  • UE 11 on carrier(s) "B” measures directly the signal strength (RSSI) of the adjacent UL carrier(s) "A”.
  • RSSI signal strength
  • UE 12 can optionally measure at the midpoint (or any point in between) of the two adjacent carriers instead of measuring both separately so that the required measurement time is reduced. RSSI measurements are very fast (1-2 time slots) and can be done efficiently without switching to compressed mode.
  • This trigger method allows a timely detection of UE to UE interference
  • FDD UL and DL is enabled without inefficient use of the downlink carrier.
  • Handovers according to the preferred embodiments are fast and efficient (no CM measurements 0173.41821A00 NC35798PCT required). Also, guard bands are not necessary, from the UE-UE interference point of view, resulting in higher spectral efficiency.
  • handovers can be done faster than inter-frequency hard handovers (due to comparable pathloss of co- sited DL carriers, DL synchronization, known SFN) and thus the missing feedback is minimized.
  • the pathloss of the target cell can be estimated because the new downlink channel that the UE has to synchronize to is coming from the same site (base station); there is only a different frequency for the channel. For example, radio transmissions at 2.5 GHz experience about 3dB stronger attenuation than radio transmissions at 2.1 GHz.
  • the transmissions from the very same base station can be synchronized which means that the UE can be provided with information indicating the synchronization status of the new cell including the system frame number (SFN).
  • SFN system frame number
  • the handovers according to the preferred embodiments are also faster than the previous inter-frequency hard handovers because it is not necessary to disrupt the uplink connection and the physical hardware resources in the network which demodulate the uplink do not have to be reallocated and reserved. Also, the handovers according to the preferred embodiments avoid the problem that, if there are terrestrial connections between the base station and the radio network controller for the uplink, it will take time to reallocate those connections. They preclude unnecessary things from happening in the network, such as signaling, resource reservations, etc, that occurred with previous handovers. 0173.41821A00 NC35798PCT

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un transfert interfréquence d'une connexion d'un équipement utilisateur, dans lequel la fréquence d'une connexion d'une liaison montante de l'équipement utilisateur vers une station de base reste la même et la fréquence d'une liaison descendante de la station de base vers l'équipement utilisateur varie d'une première fréquence de liaison descendante à une seconde fréquence de liaison descendante. Une demande pour le transfert est transmise de la station de base. L'invention concerne également les informations contenant la demande indiquant la seconde fréquence de liaison descendante et les informations indiquant que la fréquence de liaison montante reste la même. En réponse à la demande, la couche physique de la connexion d'une liaison montante est maintenue tout en changeant la fréquence de liaison descendante de la première fréquence de liaison descendante à la seconde fréquence de liaison descendante.
PCT/IB2003/001520 2002-04-29 2003-04-23 Transferts de connexions d'equipements utilisateurs dans des systemes de communications sans fil WO2003094541A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03715202A EP1502451A4 (fr) 2002-04-29 2003-04-23 Transferts de connexions d'equipements utilisateurs dans des systemes de communications sans fil
AU2003219391A AU2003219391A1 (en) 2002-04-29 2003-04-23 Handovers of user equipment connections in wireless communication systems

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US37581302P 2002-04-29 2002-04-29
US37583202P 2002-04-29 2002-04-29
US37583802P 2002-04-29 2002-04-29
US37583102P 2002-04-29 2002-04-29
US37581002P 2002-04-29 2002-04-29
US37583702P 2002-04-29 2002-04-29
US37580902P 2002-04-29 2002-04-29
US37581102P 2002-04-29 2002-04-29
US60/375,831 2002-04-29
US60/375,809 2002-04-29
US60/375,813 2002-04-29
US60/375,837 2002-04-29
US60/375,838 2002-04-29
US60/375,811 2002-04-29
US60/375,832 2002-04-29
US60/375,810 2002-04-29

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FR2875077A1 (fr) * 2004-09-09 2006-03-10 Nortel Networks Ltd Procede et dispositif de controle de la puissance d'emission d'un terminal mobile dans un systeme radio cellulaire, et terminal adapte a la mise en oeuvre du procede
WO2010097323A1 (fr) * 2009-02-24 2010-09-02 Telefonaktiebolaget L M Ericsson (Publ) Connexions asymétriques de liaison montante/liaison descendante dans un système de communication mobile
US9264943B2 (en) 2009-03-13 2016-02-16 Interdigital Patent Holdings, Inc. Method and apparatus for carrier assignment, configuration and switching for multicarrier wireless communications
US10039085B2 (en) 2008-10-31 2018-07-31 Interdigital Patent Holdings, Inc. Method and apparatus for wireless transmissions using multiple uplink carriers
US11277785B2 (en) 2017-06-16 2022-03-15 Huawei Technologies Co., Ltd. Communication method and apparatus

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US9060316B2 (en) * 2007-01-10 2015-06-16 Qualcomm Incorporated Radio resource connection (RCC) establishment for wireless systems
JP5573571B2 (ja) * 2009-11-13 2014-08-20 ソニー株式会社 無線通信装置、無線通信システム、プログラム、および無線通信方法
CN102761907A (zh) * 2011-04-25 2012-10-31 中兴通讯股份有限公司 一种接入节点调整载频的处理方法及系统
CN102271370B (zh) * 2011-08-30 2014-02-12 海能达通信股份有限公司 基站设备及信道机切换方法

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CN1663300A (zh) 2005-08-31
AU2003219391A1 (en) 2003-11-17
EP1502451A1 (fr) 2005-02-02
EP1502451A4 (fr) 2009-01-14

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