WO2009155480A1 - Optimized serving dual cell change - Google Patents

Optimized serving dual cell change Download PDF

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Publication number
WO2009155480A1
WO2009155480A1 PCT/US2009/047891 US2009047891W WO2009155480A1 WO 2009155480 A1 WO2009155480 A1 WO 2009155480A1 US 2009047891 W US2009047891 W US 2009047891W WO 2009155480 A1 WO2009155480 A1 WO 2009155480A1
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WO
WIPO (PCT)
Prior art keywords
serving cell
wtru
cell
carrier
preconfigured
Prior art date
Application number
PCT/US2009/047891
Other languages
French (fr)
Inventor
Diana Pani
Paul Marinier
Benoit Pelletier
Original Assignee
Interdigital Patent Holdings, 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 Interdigital Patent Holdings, Inc. filed Critical Interdigital Patent Holdings, Inc.
Priority to EP09767789.2A priority Critical patent/EP2292044B1/en
Priority to JP2011514827A priority patent/JP5059971B2/en
Priority to CN200980123281.7A priority patent/CN102067672B/en
Priority to KR1020147016335A priority patent/KR101633202B1/en
Priority to KR1020157012354A priority patent/KR20150060995A/en
Priority to KR1020117001105A priority patent/KR101228962B1/en
Priority to BRPI0909948-4A priority patent/BRPI0909948B1/en
Publication of WO2009155480A1 publication Critical patent/WO2009155480A1/en
Priority to HK11109506.5A priority patent/HK1155312A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/24Reselection being triggered by specific parameters
    • H04W36/26Reselection being triggered by specific parameters by agreed or negotiated communication parameters
    • H04W36/28Reselection being triggered by specific parameters by agreed or negotiated communication parameters involving a plurality of connections, e.g. multi-call or multi-bearer connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/04Reselecting a cell layer in multi-layered cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices

Definitions

  • This application is related to wireless communications.
  • Dual-cell High-Speed Downlink Packet Access (HSPA) which allows the use of a second HSPA carrier (i.e. two 5MHz downlink carriers) to create a bigger downlink data pipe.
  • HSPA High Speed Packet Access
  • the DC-HSDPA operation is backward compatible with Release 7, 6, and 5, and Release 99 devices through seamless interoperation between single- carrier and dual-carrier coverage areas.
  • Dual-cell operation provides both throughput increase and latency reduction.
  • WTRUs wireless transmit receive units
  • MIMO Multiple Input Multiple Output
  • Dual-Cell HSDPA offers efficient load balancing across carriers and some capacity gain.
  • a dual- cell capable WTRU is configured to receive two downlink carriers (an anchor carrier and a supplementary carrier), and to transmit one uplink anchor carrier.
  • the downlink anchor carrier is matched with the uplink anchor carrier.
  • a Dual Cell HSDPA WTRU may be configured to perform normal mobility procedures.
  • An important aspect of HSDPA and enhanced dedicated channel (E-DCH) mobility is the serving cell change (handover).
  • Handover is the process in which a WTRU switches from one cell to another without service interruption.
  • Soft handover refers to a feature where a WTRU is simultaneously connected to two or more cells (or cell sectors) during a call. If the sectors are from the same physical cell site (a sectorized site), it is referred to as softer handover.
  • the handover procedure does not allow for soft handover or softer handover.
  • the high-speed shared channels are monitored by the WTRU in a single cell, which is called the serving HS-DSCH cell.
  • the WTRU switches to a new serving HS-DSCH cell (target cell/Node B) and stops communication with the old serving HS-DSCH cell (source cell/Node B). This procedure is also called serving HS-DSCH cell change.
  • the WTRU must also maintain a connection with a serving E-DCH cell.
  • the serving HS-DSCH cell and serving E-DCH cell must be identical throughout the WTRU connection. Therefore, when a serving HS-DSCH cell change occurs, a serving E-DCH cell change also occurs.
  • the combined procedure is also referred to as the serving cell change.
  • the WTRU continuously measures the signal strength of the common pilot channel (CPICH) of the neighboring cells. If the measured signal of the neighboring cell exceeds that of the serving cell, the WTRU reports to the radio network controller (RNC) a change of best cell via a Radio Resource Controller (RRC) measurement report event ID.
  • RRC Radio Resource Controller
  • the measurement report contains the measured value and cell identification (cell ID).
  • the RNC then makes the final determination as to whether a serving cell change should occur.
  • a serving cell change can also occur via other RRC measurement report events, such as event IA or event 1C, or as part of an active set update procedure.
  • the RNC determines whether to perform a handover to a new cell.
  • the serving RNC (SRNC) requests the controlling RNC (CRNC) to allocate high-speed downlink shared channel (HS-DSCH) resources (e.g.
  • HS-DSCH high-speed downlink shared channel
  • HS-DSCH radio network transaction identifier H-RNTI
  • H-SCCH high-speed shared control channel
  • HARQ hybrid automatic repeat-request
  • E-DCH resources such as, E-RNTI, E-DCH Absolute Grant Channel(E-AGCH) and serving E-DCH Relative Grant Channel(E-RGCH), etc.
  • RNSAP Radio Network Subsystem Application Part
  • NBAP Node-B Application Part
  • the RRC message which can indicate a serving HS-DSCH cell change includes, but is not limited, to: a physical channel reconfiguration, transport channel reconfiguration, radio bearer reconfiguration, and active set update.
  • the RRC handover message provides the WTRU with the radio access parameters required for the WTRU to start monitoring the target cell.
  • the RRC message may provide an activation time which notifies the WTRU at which time the handover should occur.
  • Handovers can be synchronized or unsynchronized.
  • the network and the WTRU do not activate the resources and switch at the same time.
  • the activation time for the WTRU is set to "now". This reduces the delays associated with the handover procedure; however it increases the probability of losing data.
  • the network and the WTRU perform the change of resources simultaneously.
  • the network sets the activation time to a conservative value to account for any kind of delays such as scheduling delay, retransmissions, configuration time etc. While the synchronized handovers minimize data losses, it does result in higher delays.
  • the RRC handover message is transmitted to the WTRU via the source
  • the delay associated with the serving HS-DSCH cell change procedure may cause the handover message to fail, thus resulting in an unacceptable rate of dropped calls.
  • a preloading (pre-configuration) of the WTRU and the Node-B with HS-DSCH or E-DCH related configuration has been proposed.
  • the WTRU and the Node-B are pre-configured with the radio link (RL) reconfiguration prepare/ready phase.
  • RL radio link
  • Node-B HS-SCCH has also been proposed.
  • the WTRU Upon a change of the best cell, the WTRU transmits an event ID measurement report. After waiting for a configurable amount of time, the WTRU starts monitoring the pre-loaded target Node-B's HS- SCCH in addition to the HS-SCCH of the source Node-B. In performing these steps the service discontinuity is reduced.
  • Another alternative to optimize the serving HS-DSCH cell procedure is for the WTRU only to monitor one cell at a time. Once an event ID is triggered, the WTRU provides the network with the time at which the handover will occur, i.e. the connection frame number (CFN), in the measurement report message. At the given CFN, the WTRU will then stop monitoring the source cell and move to the target cell.
  • CFN connection frame number
  • Implicit re-pointing to the target Node-B at a first scheduling occurrence may also be used.
  • the RNC authorizes the handover and the target Node-B is configured and ready, the RNC can schedule the WTRU on one of the HS-SCCHs that is monitored by the WTRU.
  • the first scheduling occurrence from the target Node-B implicitly confirms a successful handover, thus a handover complete message is transmitted to the RNC.
  • the source Node-B can provide the RNC a status message indicating the amount of data that still needs to be transmitted.
  • the handover (or re-pointing) indication can also be transmitted over the target Node-B, via an HS-SCCH order, or a serving cell change channel (SCCCH), which uses the same channelization code as the E-RGCH and E-DCH HARQ Acknowledgement Indicator Channel (E-HICH) but with a different signature sequence.
  • SCCCH serving cell change channel
  • the WTRU acknowledges the handover indication by changing the UL scrambling code, or by using a special value of the channel quality indicator (CQI) (i.e. 31) or the Scheduling Information (SI).
  • CQI channel quality indicator
  • SI Scheduling Information
  • a method and apparatus for implementing serving cell change in a multi-cell wireless transmit receive unit are disclosed.
  • Serving cell information is received and stored by the WTRU to preconfigure a primary and secondary serving cell of an added cell to an active set. At least one of the preconfigured primary and secondary serving cells are monitored for a handover indication.
  • Serving cell change is to the primary and secondary serving cells us performed using the preconfigured serving cell information upon receipt of a handover indication.
  • Figure 1 is a diagram of an example wireless communication system
  • Figure 2 is a diagram of a dual-cell operable Wireless Transmit Receive
  • WTRU Power Unit
  • Figure 3 is an example flow diagram of a method for restricting access to a cell using carrier priority.
  • Figure 4 is an example deployment wherein Node Bs use mulitple frequencies to communicate with a WTRU configured with dual cell HSDPA and
  • wireless transmit/receive unit includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment.
  • base station includes but is not limited to a Node-B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.
  • the terminology “sector” includes but is not limited to one or more cells belonging to the same base station and covering the same geographical area.
  • the term sector can also be referred to as a carrier set, which includes one or more cells belonging to the same base station covering the same geographical area. Even though the definition of a sector or carrier set is described as carrier frequencies covering the same geographical area, the same definition and concept applies to the case where the cells within a carrier set have different coverage areas (i.e. one covers only a subset of the geographical area). This can depend on deployment or whether the different carriers belong to the same band or not.
  • Anchor Carrier includes but is not limited to a downlink frequency carrier associated with an uplink frequency carrier assigned to a WTRU.
  • a WTRU's anchor cell operates with all the physical channels, including Dedicated Physical Channel (DPCH)/Fractional DPCH (F- DPCH), enhanced Dedicated Channel (E-DCH) HARQ Acknowledgement Indicator Channel (E-HICH), E-DCH Absolute Grant Channel (E-AGCH), and E-DCH Relative Grant Channel (E-RGCH).
  • DPCH Dedicated Physical Channel
  • F- DPCH Fractional DPCH
  • E-DCH enhanced Dedicated Channel
  • E-HICH enhanced Dedicated Channel
  • E-HICH E-DCH Absolute Grant Channel
  • E-RGCH E-DCH Relative Grant Channel
  • the terminology “Supplementary Carrier” refers to a downlink frequency carrier which is not the Anchor Carrier.
  • the terminology “dual cell” refers to two carriers over which HS-DSCH transmissions is performed and received by the WTRU.
  • a serving sector or serving carrier set includes the serving anchor and supplementary cells.
  • Source and target serving sector refers to the old serving sector prior to the handover (i.e. the set of source anchor and supplementary cells) and the new serving sector after the handover has occurred (i.e.
  • Source anchor carrier refers to the carrier frequency being used in the source anchor serving cell.
  • Source supplementary carrier refers to the carrier frequency being used in the source supplementary serving cell.
  • Target anchor carrier refers to the carrier frequency expected to be used in the target anchor cell in the target sector.
  • the expected target anchor carrier may correspond to the same anchor frequency as the source anchor cell. Alternatively it may correspond to the carrier which has best CPICH quality measurement in the target sector, which can be anticipated to become the anchor carrier/cell.
  • Target supplementary carrier refers to the carrier frequency expected to be used in the target supplementary cell in the target sector.
  • Anchor frequency refers to the frequency being used for the anchor carrier in the current serving cell.
  • Supplementary frequency refers to the frequency being used for the supplementary carrier in the current serving cell.
  • Figure 1 shows a wireless communication system 100 including a plurality of WTRUs 110, a Node-B 120, a controlling radio network controller (CRNC) 130, a serving radio network controller (SRNC) 140, and a core network 150.
  • Node-B 120, CRNC 130 and SRNC 140 are collectively known as a Universal Terrestrial Radio Access Network (UTRAN) in 3GPP terminology.
  • UTRAN Universal Terrestrial Radio Access Network
  • Node-B 120 which is in communication with CRNC 130 and SRNC 140. Although three WTRUs 110, one Node-B 120, one CRNC 130, and one SRNC 140 are shown in Figure 1, any combination of wireless and wired devices may be included in wireless communication system 100.
  • Figure 2 is a functional block diagram 200 of a multi-cell capable
  • a multi-cell WTRU 110 includes an antenna 118, for facilitating the transmission and reception of wireless data, a receiver 116 configured to receive multi-cell wireless signals, a processor 115 configured to implement mobility procedures for multi-cell operation and a transmitter 117.
  • the receiver 116 may be a single receiver capable of receiving communications over two or more carriers, or a collection of receivers, such as receivers that are each capable of receiving communications over a single carrier.
  • the antenna 118 may comprise a single antenna or multiple antennas.
  • mutliple receiver/multiple antenna embodiment One example configuration of a mutliple receiver/multiple antenna embodiment is where each antenna is connected to its own receiver
  • a handover indication includes but it is not limited to a high speed shared control channel (HS-SCCH) order; a decoding of the HS-SCCH with a preconfigured high speed downlink shared channel (HS- DSCH) radio network transaction identifier (H-R); H-RNTI; an RRC message indicating handover; and scheduling on the E-AGCH with the WTRU's preconfigured E-RNTI.
  • HS-SCCH high speed shared control channel
  • H- DSCH radio network transaction identifier
  • H-RNTI an RRC message indicating handover
  • RRC message indicating handover
  • a handover indication includes, but it not limited to, a high speed shared control channel (HS-SCCH) order; a decoding of the HS-SCCH with a preconfigured high speed downlink shared channel (HS-DSCH) radio netork transaction identifier (H-R); H-RNTI; an RRC message indicating handover; and scheduling on the E-AGCH with the WTRU's preconfigured E-RNTI.
  • WTRU 110 monitors the cells in the target sector, which requires a set of pre- configurations and a set of rules of when and how the monitoring should be performed.
  • the high speed packet access (HSPA) resources for both carriers (anchor and supplementary cells) in all sectors in the active set are preconfigured by the network.
  • the network in addition to the anchor cell configuration parameters, the network also pre-configures WTRU 110 with the set of parameters for the secondary cell as part of the active set update procedure.
  • all of the sectors in the E-DCH active set are pre-configured. Sectors in the active set correspond to the sectors in which the cells of the active set belong (i.e., the cells in which WTRU 110 is in soft handover).
  • the pre- configuration of both cells belonging to a sector in the active set is a network decision. If no pre-configuration information is available for the supplementary carrier, WTRU 110 uses a single serving cell change procedure.
  • WTRU 110 is preloaded with the preconfiguration information (eg., configuration parameters) required for the anchor cell, as well as, the information required to perform reception, and optionally transmission, in the supplementary frequency.
  • configuration parameters may include, but are not limited to, the Secondary HS-DSCH serving cell information, such as HS-SCCH codes and a WTRU H-RNTI.
  • the network may pre- configure both carriers of the sector in the active set with the full set of resources that a cell would require if it were to become an anchor cell or a full set of parameters required by WTRU 110 to configure and operate with dual carriers in the uplink, such as the Secondary E-DCH serving cell information.
  • such parameters may include, the E-AGCH, E-HICH, E-RGCH, F-DPCH, E-RNTI(s) etc.
  • the pre- configuration of resources may be performed as part of an
  • the secondary pre- configuration for HS-DSCH is provided as part of the active set update message when a new cell (as measured on the anchor frequency) is added to the active set.
  • the pre- configuration of the secondary uplink carrier may be provided when the cell is being added to the secondary active set of the UE.
  • both UL and DL secondary pre- configuration are provided when a cell in the anchor frequency is added to the active set.
  • no UL pre- configuration is provided to WTRU 110 if a cell in the secondary frequency is added to the secondary active set of WTRU 110 and the anchor carrier associated with the secondary cell is not part of the primary active set, no UL pre- configuration is provided to WTRU 110.
  • WTRU 110 may be preconfigured with HS-DSCH parameters and, if the secondary cell has already been added to the secondary active set, the E-DCH parameters for secondary uplink operation are pre-configured.
  • WTRU 110 may be pre-configured with resources only for the anchor cell, and the resources for the target supplementary cell are received via an RRC handover message received over the target anchor cell.
  • WTRU 110 transmits a measurement report and awaits a network confirmation or message to perform the handover. For an enhanced dual- cell serving cell change procedure, WTRU 110 may wait for this indication or message on one or more of the cells in the target sector, which have been pre- configured.
  • a method to allow WTRU 110 to perform reception on the target cells includes WTRU 110 monitoring three cells, the supplementary cell and anchor cell, from the source sector, and only one of the cells in the target sector.
  • the carrier frequency with the best CPICH quality measurement, which is anticipated to become the anchor carrier, may be monitored for a handover indication.
  • the target carrier frequency that WTRU 110 monitors for the handover indication corresponds to the frequency used in the source anchor cell. This may also be used for dual carrier HSUPA.
  • this carrier frequency may correspond to the source anchor frequency, the source supplementary frequency, or in the alternative, a frequency not currently being used by the source cell.
  • the WTRU can monitor the target HS-SCCH secondary cell for the handover indication if the CPICH measurement is better than the anchor, or if the best cell corresponds to the secondary target cell.
  • WTRU 110 waits until a handover indication is received on the monitored target carrier, or until a RRC handover message is received over the source carriers. Upon reception of the handover indication, WTRU 110 may then stop receiving the HS- DSCH in the source cells (i.e. anchor and supplementary), and configure WTRU 110 to start monitoring and receiving the HS-DSCH in both the supplementary and anchor carrier of the target cells, if the resources are pre-configured. If the resources are not preconfigured for the secondary carrier, WTRU 110 may stop receiving on the source sector and start receiving only from the pre-configured carrier, and wait to receive the secondary carrier configuration from an RRC message.
  • the source cells i.e. anchor and supplementary
  • WTRU 110 may stop receiving on the source sector and start receiving only from the pre-configured carrier, and wait to receive the secondary carrier configuration from an RRC message.
  • WTRU 110 may also start DC-HSUPA transmission in the secondary carrier within the required time. WTRU 110 may start secondary E-DCH transmission as soon as the serving cell change is completed, or alternatively, wait for a HS-SCCH order to activate dual carrier transmission. When the status of secondary E-DCH transmission in the secondary source cell is active, WTRU 110 may immediately reconfigure to the target cell and start E-DCH transmission. [0056] As an option, if the status of the secondary E-DCH transmission in the source secondary cell was inactive, WTRU 110 may not start E-DCH transmission right away.
  • the RRC configures the physical layer and WTRU 110 with the pre- configured information, but WTRU 110 has to receive an HS-SCCH order activating DC-HSUPA operation.
  • a similar concept to the initiation of E-DCH transmission on the secondary target cell may also apply if WTRU 110 received a RRC handover message instead of a HS-SCCH order.
  • WTRU 110 may then transmit the CQI over the anchor HS-DPCCH, or alternatively on both HS-DPCCHs to increase the reliability of the acknowledgment message.
  • the WTRU is preloaded with the configuration parameters for the cells target sector (step 300).
  • the WTRU then monitors the cells in the target sector using the preloaded information (step 301).
  • the WTRU transmits a measurement and waits to receive a message from the RNC to perform handover (step 302).
  • the WRTU monitors the target carrier (i.e., anchor or supplementary carrier) for this message (i.e., handover indication) (step 303).
  • the WTRU ceases receiving the HS-DSCH in the source cells, and starts monitoring and receiving the HS-DSCH in the target cells (step 304).
  • WTRU 110 simultaneously monitors both the supplementary carrier and the anchor carrier on both sectors. This requires WTRU 110 to monitor four cells, i.e. the HS-SCCH of two anchor carriers and two supplementary carriers. WTRU 110 may be configured to only monitor the full HS- SCCH set of the target carriers, or alternatively, just a subset of the HS-SCCH of the target carriers. Once a handover indication is received, WTRU 110 starts monitoring the full set in the target cell.
  • the handover indication may be scheduled on both carriers to increase the reliability of the message and probability of fast detection by WTRU 110.
  • the carrier over which the handover indication was sent and received on may also indicate the carrier that should become the primary carrier once the serving cell(s) change is performed. Therefore, if the HS-SCCH indication was received over the secondary carrier, the target secondary carrier would become the new primary serving cell (i.e. the primary carrier).
  • WTRU 110 may acknowledge the handover indication using an Ll, L2, or L3 message. If an Ll message is used, for example, WTRU 110 may transmit a special value of the CQI.
  • the CQI may be transmitted over the HS-DPCCH of the corresponding carrier in which the indication was received, both HS-DPCCH used for the two carriers regardless of the carrier in which it was received, and/or on the anchor HS- DPCCH (or alternatively only on the supplementary) regardless of the carrier in which it was received.
  • the other carrier may be used to report the real CQI value to be used for faster scheduling and AMC from the network.
  • WTRU 110 only monitors the HS-SCCH of one carrier from each source and target sector (i.e. two carriers). More specifically, WTRU 110 may stop monitoring the supplementary cell in the source sector and monitor only one of the carriers of the target sector.
  • WTRU 110 may monitor the carrier frequency corresponding to the same carrier as the anchor cell in the source sector or the carrier frequency corresponding to the same carrier frequency as the supplementary cell in the source sector, WTRU 110 alternatively may then be configured to determine which carrier frequency to monitor based on the CPICH quality measurement in the target sector.
  • the carrier frequency with the best CPICH quality measurement, which is anticipated to become the anchor carrier may be monitored for a handover indication.
  • This carrier frequency may correspond to the source anchor frequency, to the source supplementary frequency, or alternatively to a frequency not currently being used by the source cell.
  • WTRU 110 in an alternative, may stop monitoring the supplementary carrier of the source cell and start monitoring the supplementary carrier of the target cell. The WTRU continues to monitoring the anchor carrier of the source cell.
  • WTRU 110 may also stop monitoring the anchor carrier HS-SCCH in the source sector while continuing to monitor the supplementary cell in the source sector. WTRU 110 can select which carrier to monitor in the target sector based on similar criteria to the ones described above.
  • WTRU 110 stops monitoring one of the carriers of the source sector after transmitting the measurement report, WTRU 110 transmit an indication to the corresponding source cell that it has interrupted reception to that cell, this notification may be made by using one or a combination Ll, L2 or L3 signaling.
  • Ll signaling is used, a special value of the CQI may be reported on the corresponding HS-DPCCH.
  • the source Node-B stops scheduling data over the corresponding carrier.
  • WTRU 110 may report a fictitious low CQI value, for example 0, which implicitly forces the Node-B to stop scheduling WTRU 110 on the corresponding carrier.
  • Using L2 signaling for this notification includes transmitting a special reserved value of the SI to the source Node-B, or the message is appended to a MAC-i/is payload, using a special value of the logical channel identifier (LCH-ID) to indicate the presence of this message.
  • LCH-ID logical channel identifier
  • the measurement report may include the time at which WTRU 110 will stop monitoring the corresponding source carrier, the time at which it will stop monitoring the source anchor carrier as well.
  • the RNC signals to the source Node-B to stop scheduling WTRU 110 in the source carrier.
  • WTRU 110 may report the CFN at which the measurement report was transmitted and both the RNC and WTRU 110 are pre-configured with a time at which WTRU 110 should stop monitoring one carrier. A time in which the handover should be performed after the CFN at which the message was transmitted may also be included in the preconfiguration.
  • WTRU 110 may then configure the supplementary carrier, or the anchor carrier in the target cell (if pre-configured) and stop monitoring the source cell.
  • WTRU 110 In another alternative method for allowing WTRU 110 to perform reception on the target cells includes WTRU 110 ceasing monitoring the HS-SCCH on both cells in the source sector, and starting monitoring both carriers on the target sector. Alternatively, only the anchor carrier in the target cell is monitored until a handover indication is received.
  • the time at which WTRU 110 stops monitoring the source cells and starts monitoring the target cells may be signaled by WTRU 110 to the network (via the CFN).
  • WTRU 110 may be configured to start monitoring the target cells at a predefined, or a configured amount of time after the measurement report is transmitted. In this case, WTRU 110 may then transmit the CFN at which the measurement report was prepared to the network to help synchronize the handover procedure.
  • WTRU 110 may change its anchor frequency and supplementary frequency, or swap the anchor frequency and supplementary frequency within the same sector using an enhanced carrier change or swap procedure. WTRU 110 may also perform a serving dual cell change with a simultaneous anchor frequency change.
  • the method includes pre-configuring the current supplementary cell of the serving sector with DL/UL information required by WTRU 110 for potential use as an anchor cell. For example, WTRU 110 is pre-configured with the F-DPCH, E- AGCH, serving R-GCH, C-RNTI, E-RNTI(s), and other configurations required for WTRU 110 to configure another (or a supplementary) carrier as an anchor carrier.
  • the network may also pre- configure the supplementary cells of all sectors in the active set with information required by WTRU 110 to use this frequency as an anchor cell, or to use this frequency for dual carrier uplink operation, such as secondary E-DCH serving cell information (i.e. E-AGCH, E-RGCH, E-HICH, F- DPCH, etc).
  • E-AGCH E-AGCH
  • E-RGCH E-HICH
  • F- DPCH F- DPCH
  • the information is stored in WTRU 110 and deleted when the serving cell is removed from the active set.
  • WTRU 110 may use the same channelization codes and information which were configured in the anchor cell and apply the same configuration to the second frequency. Other parameters, for example, C-RNTI and E-RNTI(s) may also need to be pre-loaded.
  • the supplementary carrier is pre-configured as an anchor carrier for all cells of the active set.
  • a measurement report may trigger a swap of the anchor frequency and supplementary frequency if a trigger occurs.
  • This trigger may occur when the cell of the supplementary frequency is the best cell for a measurement report triggered by event ID message (i.e., a new cell in the supplementary frequency has become better than the current cell in the source supplementary, and optionally source anchor frequency), or another similar event, such as, an inter-frequency event, wherein the quality of the secondary cell has become better than the quality of the anchor cell by a configured threshold and for a configured amount of time.
  • the quality (e.g. CPICH Ec/No) of the anchor carrier is lower than a threshold or has been lower than a threshold for a pre-determined period of time may also be a trigger. Stated another way, the quality of the supplementary carrier is higher than a threshold for a predetermined period of time.
  • the threshold may be a function of the CPICH Ec/No of the supplementary carrier.
  • Another trigger may occur when the quality of the anchor carrier is lower than a first threshold and the quality of the supplementary carrier is higher than a second threshold.
  • a combination of these in the measurement report may also trigger a frequency swap (i.e. an inter-frequency handover) or a serving cell change with a simulataneous change of anchor frequency.
  • WTRU 110 When a measurement report is triggered according to one of the criteria mentioned above, this would result in WTRU 110 changing the anchor carrier frequency within the serving sector, if the anchor carrier and the supplementary carrier are swapped within the serving sector, or changing the anchor carrier frequency while changing the serving cell or sector at the same time.
  • WTRU 110 may continue to listen to both the anchor cell and the supplementary cell and wait for an HS-SCCH order, or handover indication, to indicate that the handover should be performed.
  • the monitoring of the HS-SCCH should be performed according to one of the methods disclosed above.
  • WTRU 110 may stop listening to, or receiving, the DL control channels (i.e. F-DPCH, E-AGCH, E-HICH and E-RGCH) in the anchor frequency, continue the HS-SCCH and HS-DPSCH monitoring in the anchor carrier, and consider this carrier as the supplementary carrier.
  • WTRU 110 may also reconfigure the supplementary carrier to start acting as an anchor carrier (e.g., WTRU 110 starts monitoring the F-DPCH, E-AGCH, E- RGCH, etc. in the new anchor carrier.), and start transmission of the DPCCH and HS-DPCCH in the new frequency.
  • WTRU 110 may also perform the synchronization procedure with the new frequency (i.e., synchronization A). If the handover results in a change of an UL carrier frequency, WTRU 110 starts the power control loop with the new UL frequency as soon as the handover is complete and the new physical channels (i.e. F- DPCH or DPCCH) are established. For the initial DPCCH power value, WTRU 110 may use the last DPCCH power used in the old anchor carrier with a possible addition of a network configurable DPCCH power offset.
  • the new frequency i.e., synchronization A
  • WTRU 110 does not support soft handover with radio links in different frequencies, then all configured DL radio links in the active set for the other cells in the previous frequency, other than the serving cell are autonomously released by WTRU 110.
  • the UL radio link may also be maintained if WTRU 110 maintains the same UL frequency.
  • the WTRU may wait for an RRC handover message to be configured with the new parameters for the new active set in the new carrier.
  • the changing of the used anchor frequency requires WTRU 110 to stop DPCCH and HS-DPCCH transmission in the old anchor carrier frequency and start transmission in the new anchor carrier frequency (i.e., the old supplementary frequency).
  • the change when DC-HSUPA is configured or when the information if pre-configured in the target sector, requires less changes and thus it is much faster to perform.
  • WTRU 110 continues to use the same configured physical channels and continues with the same active set, but changes the logical association from anchor to supplementary, and vice versa.
  • WTRU 110 may switch the anchor frequency with the supplementary frequency (i.e., the old anchor carrier is no longer being used).
  • WTRU 110 may monitor only the supplementary carrier for a handover indication while continuing reception in the anchor carrier.
  • WTRU 110 may stop listen to the old anchor frequency, and/or reconfigure the supplementary carrier to perform as an anchor carrier. For example, WTRU 110 starts monitoring the F- DPCH, E-AGCH, E-RGCH, etc. in the new anchor carrier.
  • WTRU 110 may also initiate the synchronization procedure with the new frequency. If the handover results in a change of the UL carrier frequency, WTRU 110 may start the power control loop with the new UL frequency as soon as the handover is complete. For the initial DPCCH power value, WTRU 110 may use the last DPCCH power used in the old anchor carrier with a possible addition of a network configurable DPCCH power offset.
  • WTRU 110 does not support soft handover with radio links in different frequencies, all of the configured DL radio links in the active set for the other cells, other than the serving cell, are autonomously released by WTRU 110. It is an option to have the UL radio link be maintained if WTRU 110 maintains the same UL frequency.
  • WTRU 110 may also wait for an RRC handover message to be configured with the new parameters for the new active set in the new carrier and the new supplementary carrier. [0090] As indicated above, WTRU 110 may be configured with dual cell
  • FIG. 4 illustrated three scenarios in which the Node B uses one or more of available frequencies to communicate with WTRU 110.
  • WTRU 110 in a first scenario, WTRU 110 is operating in single carrier operation and performing HS-DSCH and E-DCH reception, and in soft handover with NB 2 and 3.
  • NB or cell
  • WRU 110 is preconfigured with primary serving cell information.
  • WTRU 110 may also be preconfigured with secondary HS-DSCH and E-DCH serving cell information.
  • This preconfigured information may include, but is not limited to, E-AGCH, E-RGCH, HS-SCCH, H-RNTI, E-RNTI, F-DPCH, etc.
  • E-AGCH E-AGCH
  • E-RGCH E-RGCH
  • HS-SCCH H-RNTI
  • E-RNTI E-RNTI
  • F-DPCH F-DPCH
  • WTRU 110 moves from scenario 1 to scenario 2 in Figure 4, a change of best cell occurs (i.e., event ID is triggered).
  • event ID is triggered.
  • WTRU 110 monitors the anchor HS- DSCH serving cell for a handover indication. If a handover indication is received, WTRU 110 performs a fast serving cell change to both the primary and secondary HS-DSCH serving cell.
  • both secondary HS-DSCH and E-DCH serving cell information are preconfigured, WTRU 110, after receiving the HS- SCCH order over the anchor frequency, configures primary and secondary HS- DSCH reception and starts both primary and secondary E-DCH transmission.
  • WTRU 110 may perform a synchronization procedure on the secondary carrier when the serving cell(s) change is performed. This is due to the fact that no ongoing secondary E-DCH transmission was available in the source cells.
  • the RRC configures the secondary E-DCH transmission parameters, but transmission over the secondary E-DCH does not start until an HS-SCCH order activating the secondary carrier is received by WTRU 110.
  • the secondary active set is updated by the network according the measurements sent by WTRU 110.
  • the network may provide WTRU 110 with a set of pre-configured secondary E-DCH serving cell parameters and a set of HS-DSCH parameters for cell 4.
  • the network may pre-configure WTRU 110 with all parameters for this carrier to become an anchor carrier if necessary.
  • WTRU 110 moves from scenario 2 to scenario 3, where an event ID is triggered and the best cell is a cell that only belongs to the secondary frequency and no primary cell is present, a fast frequency change may occur.
  • WTRU 110 triggers a measurement report with event ID, indicating the cell 4 as the best cell
  • WTRU 110 continues monitoring the source HS-DSCH and the source E-DCH cell and simultaneously the first HS-SCCH set provided in the preconfigured secondary carrier information.
  • WTRU 110 may perform a serving cell change to cell 4 and at the same time a fast primary frequency change.
  • WTRU 110 Since WTRU 110 is already synchronized on the secondary carrier and already has an active set, WTRU 110 may continue transmission over the new primary serving cells without the need to perform a synchronization procedure.
  • the radio links previously established in fl are released, and WTRU 110 performs only single carrier operation.
  • the preconfigured information for the cells in the active set of the fl carrier may be maintained and stored in WTRU 110 and treated as secondary pre-configured HS-DSCH and E-DCH serving cell information.
  • WTRU 110 may receive a serving change command that performs a serving cell change and also a change of anchor and secondary carrier.
  • WTRU 110 may monitor the target anchor HS-DSCH cell for a handover indication and perform the handover to the secondary carrier.
  • WTRU 110 may monitor both target anchor and secondary HS-DSCH, and if the order is received over the anchor HS-DSCH cell WTRU 110 performs a serving cell change, while keeping the same anchor carrier.
  • WTRU 110 performs a serving cell change and configures the secondary frequency (f2) as the anchor carrier of WTRU 110 and starts all anchor carrier operations, such as transmission of DPCCH and HS- DPCCH over this new frequency.
  • the active sets of fl and f2 are maintained and no synchronization procedures need to be initiated.
  • a method for implementing a serving cell change in a multi-cell wireless transmit receive unit comprising: adding a cell to an active set; receiving serving cell information to preconfigure a primary and secondary serving cell for the added cell; and storing the serving cell information.
  • the method of embodiment 1 further comprising: monitoring at least one of the preconfigured primary and secondary serving cells for a handover indication; and on the condition that a handover indication is received, performing a serving cell change to the primary and secondary serving cells from a source primary and secondary serving cell using the preconfigured serving cell information.
  • the serving cell information of the preconfigured secondary serving cell includes a secondary high-speed downlink shared channel (HS-DSCH) serving cell information, high-speed shared control channel (HS-SCCH), HS-DSCH radio network transaction identifier (H-RNTI) of the preconfigured secondary serving cell.
  • HS-DSCH high-speed downlink shared channel
  • HS-SCCH high-speed shared control channel
  • H-RNTI HS-DSCH radio network transaction identifier
  • performing serving cell change includes reconfiguring a primary serving cell and the HS-DSCH of a secondary serving cell using the preconfigured information.
  • performing serving cell change includes reconfiguring an enhanced dedicated channel (E-DCH).
  • E-DCH enhanced dedicated channel
  • a measurement report includes a time at which the source primary or secondary serving cell will stop being monitored.
  • a wireless transmit receive unit configured to implement the method as in any one of embodiments 1- 22.
  • the WTRU of embodiment 23 configured with dual cell High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA).
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • a Node B configured of implement the method as in any one of embodiments 1 - 22.
  • a processor configured to implement the method as in any one of embodiments 1 — 22.
  • WCDMA systems it should be understood that it is applicable to any wireless communications system that can support dual (or multi) cell (or carrier) operations.
  • WCDMA systems it should be understood that it is applicable to any wireless communications system that can support dual (or multi) cell (or carrier) operations.
  • features and elements are described above in particular combinations, each feature or element can be used alone without the other features and elements or in various combinations with or without other features and elements.
  • the methods or flow charts provided herein may be implemented in a computer program, software, or firmware incorporated in a computer-readable storage medium for execution by a general purpose computer or a processor.
  • Examples of computer-readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
  • DSP digital signal processor
  • ASICs Application Specific Integrated Circuits
  • FPGAs Field Programmable Gate Arrays
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
  • the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light -emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.
  • WLAN wireless local area network
  • UWB Ultra Wide Band

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Abstract

A method and apparatus for implementing serving cell change in a multi-cell wireless transmit receive unit (WTRU) (110) are disclosed. Serving cell information is received and stored by the WTRU (110) to preconfigure a primary and secondary serving cell of an added cell to an active set. At least one of the preconfigured primary and secondary serving cells are monitored for a handover indication. Serving cell change is to the primary and secondary serving cells us performed using the preconfigured serving cell information upon receipt of a handover indication.

Description

[0001] OPTIMIZED SERVING DUAL CELL CHANGE
[0002] FIELD OF INVENTION
[0003] This application is related to wireless communications.
[0004] BACKGROUND
[0005] As part of the on-going evolution of the third Generation Partnership
Project (3GPP) Wideband Code Division Multiple Access (WCDMA) standard, Dual- Cell High-Speed Downlink Packet Access (HSDPA) (DC-HSDPA) has been approved in 3GPP. Dual-cell HSDPA is a natural evolution of High Speed Packet Access (HSPA) which allows the use of a second HSPA carrier (i.e. two 5MHz downlink carriers) to create a bigger downlink data pipe.
[0006] The DC-HSDPA operation is backward compatible with Release 7, 6, and 5, and Release 99 devices through seamless interoperation between single- carrier and dual-carrier coverage areas. Dual-cell operation provides both throughput increase and latency reduction. Most importantly, more wireless transmit receive units (WTRUs) have access to higher data rates, especially in poor radio conditions where techniques such as Multiple Input Multiple Output (MIMO) are not used. In terms of system performance, Dual-Cell HSDPA offers efficient load balancing across carriers and some capacity gain.
[0007] The agreed dual-cell operation in Release 8 of the 3GPP standard only applies to the downlink, with the uplink (UL) transmission restricted to a single cell, i.e., carrier. Furthermore, the following additional restrictions have been imposed: the two downlink cells belong to the same Node- B and are on adjacent carriers (and by extension the carriers are in the same frequency band) ; two carriers operating in the dual- cell have the same time reference and their downlinks are synchronized; and the two downlink cells cover the same geographical area(sector). Accordingly, a dual- cell capable WTRU is configured to receive two downlink carriers (an anchor carrier and a supplementary carrier), and to transmit one uplink anchor carrier. The downlink anchor carrier is matched with the uplink anchor carrier. [0008] Additionally, inter-frequency handovers can be used to change anchor carriers within a Node-B.
[0009] A Dual Cell HSDPA WTRU may be configured to perform normal mobility procedures. An important aspect of HSDPA and enhanced dedicated channel (E-DCH) mobility is the serving cell change (handover). Handover is the process in which a WTRU switches from one cell to another without service interruption. Soft handover refers to a feature where a WTRU is simultaneously connected to two or more cells (or cell sectors) during a call. If the sectors are from the same physical cell site (a sectorized site), it is referred to as softer handover. [0010] In HSDPA, the handover procedure does not allow for soft handover or softer handover. The high-speed shared channels are monitored by the WTRU in a single cell, which is called the serving HS-DSCH cell. During handover, the WTRU switches to a new serving HS-DSCH cell (target cell/Node B) and stops communication with the old serving HS-DSCH cell (source cell/Node B). This procedure is also called serving HS-DSCH cell change.
[0011] With the introduction of the enhanced DCH in the UL, the WTRU must also maintain a connection with a serving E-DCH cell. The serving HS-DSCH cell and serving E-DCH cell must be identical throughout the WTRU connection. Therefore, when a serving HS-DSCH cell change occurs, a serving E-DCH cell change also occurs. The combined procedure is also referred to as the serving cell change.
[0012] An important aspect in handover is the selection of a "best cell".
Accordingly, the WTRU continuously measures the signal strength of the common pilot channel (CPICH) of the neighboring cells. If the measured signal of the neighboring cell exceeds that of the serving cell, the WTRU reports to the radio network controller (RNC) a change of best cell via a Radio Resource Controller (RRC) measurement report event ID. The measurement report contains the measured value and cell identification (cell ID). The RNC then makes the final determination as to whether a serving cell change should occur. [0013] A serving cell change can also occur via other RRC measurement report events, such as event IA or event 1C, or as part of an active set update procedure.
[0014] Upon reception of these events, the RNC determines whether to perform a handover to a new cell. The serving RNC (SRNC) requests the controlling RNC (CRNC) to allocate high-speed downlink shared channel (HS-DSCH) resources (e.g. as HS-DSCH radio network transaction identifier (H-RNTI), high-speed shared control channel (HS-SCCH) codes, hybrid automatic repeat-request (HARQ) resources, etc.) and E-DCH resources (such as, E-RNTI, E-DCH Absolute Grant Channel(E-AGCH) and serving E-DCH Relative Grant Channel(E-RGCH), etc.) for the WTRU in the target cell via Radio Network Subsystem Application Part (RNSAP) and/or Node-B Application Part (NBAP) messages. Once the resources are reserved, the CRNC provides all the information to the SRNC which in turn transmits an RRC handover message to the WTRU. The RRC message, which can indicate a serving HS-DSCH cell change includes, but is not limited, to: a physical channel reconfiguration, transport channel reconfiguration, radio bearer reconfiguration, and active set update.
[0015] The RRC handover message provides the WTRU with the radio access parameters required for the WTRU to start monitoring the target cell. In addition, the RRC message may provide an activation time which notifies the WTRU at which time the handover should occur.
[0016] Handovers can be synchronized or unsynchronized. In an unsynchronized handover the network and the WTRU do not activate the resources and switch at the same time. The activation time for the WTRU is set to "now". This reduces the delays associated with the handover procedure; however it increases the probability of losing data.
[0017] In a synchronized handover, the network and the WTRU perform the change of resources simultaneously. The network sets the activation time to a conservative value to account for any kind of delays such as scheduling delay, retransmissions, configuration time etc. While the synchronized handovers minimize data losses, it does result in higher delays. [0018] The RRC handover message is transmitted to the WTRU via the source
Node-B. The delay associated with the serving HS-DSCH cell change procedure may cause the handover message to fail, thus resulting in an unacceptable rate of dropped calls. As a result, to optimize the serving HS-DSCH cell procedure, a preloading (pre-configuration) of the WTRU and the Node-B with HS-DSCH or E-DCH related configuration has been proposed. When a cell is added to the active set, the WTRU and the Node-B are pre-configured with the radio link (RL) reconfiguration prepare/ready phase. When a change in the best cell occurs (i.e. an event ID), the configuration of the target Node-B, which is already pre-configured, can be activated by the RNC.
[0019] Parallel monitoring of the source Node-B HS-SCCH and the target
Node-B HS-SCCH has also been proposed. Upon a change of the best cell, the WTRU transmits an event ID measurement report. After waiting for a configurable amount of time, the WTRU starts monitoring the pre-loaded target Node-B's HS- SCCH in addition to the HS-SCCH of the source Node-B. In performing these steps the service discontinuity is reduced.
[0020] Another alternative to optimize the serving HS-DSCH cell procedure is for the WTRU only to monitor one cell at a time. Once an event ID is triggered, the WTRU provides the network with the time at which the handover will occur, i.e. the connection frame number (CFN), in the measurement report message. At the given CFN, the WTRU will then stop monitoring the source cell and move to the target cell.
[0021] Implicit re-pointing to the target Node-B at a first scheduling occurrence may also be used. When the RNC authorizes the handover and the target Node-B is configured and ready, the RNC can schedule the WTRU on one of the HS-SCCHs that is monitored by the WTRU. The first scheduling occurrence from the target Node-B implicitly confirms a successful handover, thus a handover complete message is transmitted to the RNC. To avoid packet loss, the source Node-B can provide the RNC a status message indicating the amount of data that still needs to be transmitted. [0022] The handover (or re-pointing) indication can also be transmitted over the target Node-B, via an HS-SCCH order, or a serving cell change channel (SCCCH), which uses the same channelization code as the E-RGCH and E-DCH HARQ Acknowledgement Indicator Channel (E-HICH) but with a different signature sequence.
[0023] The WTRU acknowledges the handover indication by changing the UL scrambling code, or by using a special value of the channel quality indicator (CQI) (i.e. 31) or the Scheduling Information (SI).
[0024] The introduction of a second carrier in the downlink impacts existing mobility procedures. The enhancements to the serving cell change procedure have been optimized in the context of single carrier operation. When a second carrier is introduced the enhanced serving cell change procedure does not take into account both carriers. Therefore, there exists a need for an improved method and apparatus for dual serving cell change .
[0025] SUMMARY
[0026] A method and apparatus for implementing serving cell change in a multi-cell wireless transmit receive unit (WTRU) are disclosed. Serving cell information is received and stored by the WTRU to preconfigure a primary and secondary serving cell of an added cell to an active set. At least one of the preconfigured primary and secondary serving cells are monitored for a handover indication. Serving cell change is to the primary and secondary serving cells us performed using the preconfigured serving cell information upon receipt of a handover indication.
[0027] BRIEF DESCRIPTION OF THE DRAWINGS
[0028] A more detailed understanding may be had from the following description, given by way of example in conjunction with the accompanying drawings wherein: [0029] Figure 1 is a diagram of an example wireless communication system; [0030] Figure 2 is a diagram of a dual-cell operable Wireless Transmit Receive
Unit (WTRU);
[0031] Figure 3 is an example flow diagram of a method for restricting access to a cell using carrier priority; and
[0032] Figure 4 is an example deployment wherein Node Bs use mulitple frequencies to communicate with a WTRU configured with dual cell HSDPA and
HSUPA.
[0033] DETAILED DESCRIPTION
[0034] When referred to hereafter, the terminology "wireless transmit/receive unit (WTRU)" includes but is not limited to a user equipment (UE), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment. When referred to hereafter, the terminology "base station" includes but is not limited to a Node-B, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment. [0035] When referred to hereafter, the terminology "sector" includes but is not limited to one or more cells belonging to the same base station and covering the same geographical area. The term sector can also be referred to as a carrier set, which includes one or more cells belonging to the same base station covering the same geographical area. Even though the definition of a sector or carrier set is described as carrier frequencies covering the same geographical area, the same definition and concept applies to the case where the cells within a carrier set have different coverage areas (i.e. one covers only a subset of the geographical area). This can depend on deployment or whether the different carriers belong to the same band or not. The terminology "Anchor Carrier" includes but is not limited to a downlink frequency carrier associated with an uplink frequency carrier assigned to a WTRU. More specifically, a WTRU's anchor cell operates with all the physical channels, including Dedicated Physical Channel (DPCH)/Fractional DPCH (F- DPCH), enhanced Dedicated Channel (E-DCH) HARQ Acknowledgement Indicator Channel (E-HICH), E-DCH Absolute Grant Channel (E-AGCH), and E-DCH Relative Grant Channel (E-RGCH). Additionally, an anchor carrier can also be referred to as the carrier which has an associated UL carrier, where the HS-DPCCH is transmitted on. The terminology "Anchor carrier" and "primary carrier" are used interchangeably.
[0036] The terminology "Supplementary Carrier" refers to a downlink frequency carrier which is not the Anchor Carrier. The terminology "dual cell" refers to two carriers over which HS-DSCH transmissions is performed and received by the WTRU.
[0037] With multi-carrier operation, more than two (2) cells can be configured for simultaneous HS-DSCH transmission, however the concepts described herein are still applicable, where the definition of the anchor carrier remains the same and the WTRU may have more than one supplementary carrier. Even though the invention is described in terms of dual carrier HSDPA operation, it is also applicable to dual carrier uplink operation and multi carrier, UL and DL operations. [0038] When referred to hereafter, a serving sector or serving carrier set includes the serving anchor and supplementary cells. Source and target serving sector refers to the old serving sector prior to the handover (i.e. the set of source anchor and supplementary cells) and the new serving sector after the handover has occurred (i.e. the set of target anchor and supplementary cells) in which the WTRU is performing HS-DSCH reception, respectively. Source anchor carrier refers to the carrier frequency being used in the source anchor serving cell. Source supplementary carrier refers to the carrier frequency being used in the source supplementary serving cell. Target anchor carrier refers to the carrier frequency expected to be used in the target anchor cell in the target sector. The expected target anchor carrier may correspond to the same anchor frequency as the source anchor cell. Alternatively it may correspond to the carrier which has best CPICH quality measurement in the target sector, which can be anticipated to become the anchor carrier/cell. Target supplementary carrier refers to the carrier frequency expected to be used in the target supplementary cell in the target sector. Anchor frequency refers to the frequency being used for the anchor carrier in the current serving cell. Supplementary frequency refers to the frequency being used for the supplementary carrier in the current serving cell.
[0039] Figure 1 shows a wireless communication system 100 including a plurality of WTRUs 110, a Node-B 120, a controlling radio network controller (CRNC) 130, a serving radio network controller (SRNC) 140, and a core network 150. Node-B 120, CRNC 130 and SRNC 140 are collectively known as a Universal Terrestrial Radio Access Network (UTRAN) in 3GPP terminology. [0040] As shown in Figure 1, WTRUs 110 are in communication with the
Node-B 120, which is in communication with CRNC 130 and SRNC 140. Although three WTRUs 110, one Node-B 120, one CRNC 130, and one SRNC 140 are shown in Figure 1, any combination of wireless and wired devices may be included in wireless communication system 100.
[0041] Figure 2 is a functional block diagram 200 of a multi-cell capable
WTRU 110 of wireless communication system 100 of Figure 1. The WTRU 110 is configured to perform and enhance mobility procedures in, for example, a CELL Dedicated Channel (DCH) (CELL_DCH) state, or other states. [0042] In addition to the components that may be found in a typical WTRU, a multi-cell WTRU 110 includes an antenna 118, for facilitating the transmission and reception of wireless data, a receiver 116 configured to receive multi-cell wireless signals, a processor 115 configured to implement mobility procedures for multi-cell operation and a transmitter 117. The receiver 116 may be a single receiver capable of receiving communications over two or more carriers, or a collection of receivers, such as receivers that are each capable of receiving communications over a single carrier.
[0043] The antenna 118 may comprise a single antenna or multiple antennas.
One example configuration of a mutliple receiver/multiple antenna embodiment is where each antenna is connected to its own receiver
[0044] In the example configuration of Figure 2, the receiver 116 and the transmitter 117 are in communication with the processor 115. The antenna 118 is in communication with both the receiver 116 and the transmitter 117 to facilitate the transmission and reception of wireless data. A handover indication includes but it is not limited to a high speed shared control channel (HS-SCCH) order; a decoding of the HS-SCCH with a preconfigured high speed downlink shared channel (HS- DSCH) radio network transaction identifier (H-R); H-RNTI; an RRC message indicating handover; and scheduling on the E-AGCH with the WTRU's preconfigured E-RNTI.
[0045] In accordance with a disclosed method of performing a dual-cell serving cell change, one or more of the cells in a target sector are monitored to receive a handover indication. A handover indication includes, but it not limited to, a high speed shared control channel (HS-SCCH) order; a decoding of the HS-SCCH with a preconfigured high speed downlink shared channel (HS-DSCH) radio netork transaction identifier (H-R); H-RNTI; an RRC message indicating handover; and scheduling on the E-AGCH with the WTRU's preconfigured E-RNTI. [0046] In order to perform the handover, WTRU 110 monitors the cells in the target sector, which requires a set of pre- configurations and a set of rules of when and how the monitoring should be performed.
[0047] Accordingly, the high speed packet access (HSPA) resources for both carriers (anchor and supplementary cells) in all sectors in the active set are preconfigured by the network. As such, in addition to the anchor cell configuration parameters, the network also pre-configures WTRU 110 with the set of parameters for the secondary cell as part of the active set update procedure. Alternatively, all of the sectors in the E-DCH active set are pre-configured. Sectors in the active set correspond to the sectors in which the cells of the active set belong (i.e., the cells in which WTRU 110 is in soft handover). The pre- configuration of both cells belonging to a sector in the active set is a network decision. If no pre-configuration information is available for the supplementary carrier, WTRU 110 uses a single serving cell change procedure.
[0048] WTRU 110 is preloaded with the preconfiguration information (eg., configuration parameters) required for the anchor cell, as well as, the information required to perform reception, and optionally transmission, in the supplementary frequency. Such configuration parameters may include, but are not limited to, the Secondary HS-DSCH serving cell information, such as HS-SCCH codes and a WTRU H-RNTI. Alternatively, for the supplementary cell, the network may pre- configure both carriers of the sector in the active set with the full set of resources that a cell would require if it were to become an anchor cell or a full set of parameters required by WTRU 110 to configure and operate with dual carriers in the uplink, such as the Secondary E-DCH serving cell information. For example, such parameters may include, the E-AGCH, E-HICH, E-RGCH, F-DPCH, E-RNTI(s) etc.
[0049] The pre- configuration of resources may be performed as part of an
Active Set Update procedure when a cell is added to the active set. For dual carrier HSDPA, the secondary pre- configuration for HS-DSCH is provided as part of the active set update message when a new cell (as measured on the anchor frequency) is added to the active set. In the case of dual carrier uplink, the pre- configuration of the secondary uplink carrier may be provided when the cell is being added to the secondary active set of the UE. Alternatively, both UL and DL secondary pre- configuration are provided when a cell in the anchor frequency is added to the active set. Optionally, if a cell in the secondary frequency is added to the secondary active set of WTRU 110 and the anchor carrier associated with the secondary cell is not part of the primary active set, no UL pre- configuration is provided to WTRU 110. Alternatively, if the active set update is adding a cell in the anchor frequency to the active set, WTRU 110 may be preconfigured with HS-DSCH parameters and, if the secondary cell has already been added to the secondary active set, the E-DCH parameters for secondary uplink operation are pre-configured. In another alternative, WTRU 110 may be pre-configured with resources only for the anchor cell, and the resources for the target supplementary cell are received via an RRC handover message received over the target anchor cell.
[0050] When a measurement event resulting in a change of the best cell between two sectors occurs, WTRU 110 transmits a measurement report and awaits a network confirmation or message to perform the handover. For an enhanced dual- cell serving cell change procedure, WTRU 110 may wait for this indication or message on one or more of the cells in the target sector, which have been pre- configured. [0051] Because WTRU 110 may be receiving data over both carriers in the source sector, a method to allow WTRU 110 to perform reception on the target cells includes WTRU 110 monitoring three cells, the supplementary cell and anchor cell, from the source sector, and only one of the cells in the target sector. [0052] The carrier frequency with the best CPICH quality measurement, which is anticipated to become the anchor carrier, may be monitored for a handover indication. For dual carrier HSDPA, the target carrier frequency that WTRU 110 monitors for the handover indication corresponds to the frequency used in the source anchor cell. This may also be used for dual carrier HSUPA. [0053] When dual carrier HSUPA is implemented in the WTRU, since the
CPICH quality is measured on both frequency, this carrier frequency may correspond to the source anchor frequency, the source supplementary frequency, or in the alternative, a frequency not currently being used by the source cell. For dual carrier HSUPA, since the WTRU measures both cells, the WTRU can monitor the target HS-SCCH secondary cell for the handover indication if the CPICH measurement is better than the anchor, or if the best cell corresponds to the secondary target cell.
[0054] Since only one of the target carriers of the target sector is monitored,
WTRU 110 waits until a handover indication is received on the monitored target carrier, or until a RRC handover message is received over the source carriers. Upon reception of the handover indication, WTRU 110 may then stop receiving the HS- DSCH in the source cells (i.e. anchor and supplementary), and configure WTRU 110 to start monitoring and receiving the HS-DSCH in both the supplementary and anchor carrier of the target cells, if the resources are pre-configured. If the resources are not preconfigured for the secondary carrier, WTRU 110 may stop receiving on the source sector and start receiving only from the pre-configured carrier, and wait to receive the secondary carrier configuration from an RRC message.
[0055] If DC-HSUPA is configured, and the secondary information are preconfigured, WTRU 110 may also start DC-HSUPA transmission in the secondary carrier within the required time. WTRU 110 may start secondary E-DCH transmission as soon as the serving cell change is completed, or alternatively, wait for a HS-SCCH order to activate dual carrier transmission. When the status of secondary E-DCH transmission in the secondary source cell is active, WTRU 110 may immediately reconfigure to the target cell and start E-DCH transmission. [0056] As an option, if the status of the secondary E-DCH transmission in the source secondary cell was inactive, WTRU 110 may not start E-DCH transmission right away. The RRC configures the physical layer and WTRU 110 with the pre- configured information, but WTRU 110 has to receive an HS-SCCH order activating DC-HSUPA operation. A similar concept to the initiation of E-DCH transmission on the secondary target cell may also apply if WTRU 110 received a RRC handover message instead of a HS-SCCH order.
[0057] If a special value of the CQI is used for a handover acknowledgment
WTRU 110 may then transmit the CQI over the anchor HS-DPCCH, or alternatively on both HS-DPCCHs to increase the reliability of the acknowledgment message.
[0058] A flow diagram of this disclosed method is shown in Figure 3. A
WTRU is preloaded with the configuration parameters for the cells target sector (step 300). The WTRU then monitors the cells in the target sector using the preloaded information (step 301). When a measurement event results in a change of the best cell between two sectors, the WTRU transmits a measurement and waits to receive a message from the RNC to perform handover (step 302). The WRTU monitors the target carrier (i.e., anchor or supplementary carrier) for this message (i.e., handover indication) (step 303). Upon receipt of the handover indication, the WTRU ceases receiving the HS-DSCH in the source cells, and starts monitoring and receiving the HS-DSCH in the target cells (step 304).
[0059] In an alternative method, WTRU 110 simultaneously monitors both the supplementary carrier and the anchor carrier on both sectors. This requires WTRU 110 to monitor four cells, i.e. the HS-SCCH of two anchor carriers and two supplementary carriers. WTRU 110 may be configured to only monitor the full HS- SCCH set of the target carriers, or alternatively, just a subset of the HS-SCCH of the target carriers. Once a handover indication is received, WTRU 110 starts monitoring the full set in the target cell.
[0060] In accordance with this method, the handover indication may be scheduled on both carriers to increase the reliability of the message and probability of fast detection by WTRU 110. The carrier over which the handover indication was sent and received on, may also indicate the carrier that should become the primary carrier once the serving cell(s) change is performed. Therefore, if the HS-SCCH indication was received over the secondary carrier, the target secondary carrier would become the new primary serving cell (i.e. the primary carrier). Upon reception of the handover indication, WTRU 110 may acknowledge the handover indication using an Ll, L2, or L3 message. If an Ll message is used, for example, WTRU 110 may transmit a special value of the CQI.
[0061] The CQI may be transmitted over the HS-DPCCH of the corresponding carrier in which the indication was received, both HS-DPCCH used for the two carriers regardless of the carrier in which it was received, and/or on the anchor HS- DPCCH (or alternatively only on the supplementary) regardless of the carrier in which it was received. In the latter, the other carrier may be used to report the real CQI value to be used for faster scheduling and AMC from the network. [0062] In another alternative, WTRU 110 only monitors the HS-SCCH of one carrier from each source and target sector (i.e. two carriers). More specifically, WTRU 110 may stop monitoring the supplementary cell in the source sector and monitor only one of the carriers of the target sector. This allows WTRU 110 to reduce the complexity of monitoring more than two HS-SCCH sources, while still monitoring the source cell and not interrupting voice call continuity. [0063] For monitoring the target sector, WTRU 110 may monitor the carrier frequency corresponding to the same carrier as the anchor cell in the source sector or the carrier frequency corresponding to the same carrier frequency as the supplementary cell in the source sector, WTRU 110 alternatively may then be configured to determine which carrier frequency to monitor based on the CPICH quality measurement in the target sector. The carrier frequency with the best CPICH quality measurement, which is anticipated to become the anchor carrier, may be monitored for a handover indication. This carrier frequency may correspond to the source anchor frequency, to the source supplementary frequency, or alternatively to a frequency not currently being used by the source cell. [0064] WTRU 110 in an alternative, may stop monitoring the supplementary carrier of the source cell and start monitoring the supplementary carrier of the target cell. The WTRU continues to monitoring the anchor carrier of the source cell.
[0065] WTRU 110 may also stop monitoring the anchor carrier HS-SCCH in the source sector while continuing to monitor the supplementary cell in the source sector. WTRU 110 can select which carrier to monitor in the target sector based on similar criteria to the ones described above.
[0066] If WTRU 110 stops monitoring one of the carriers of the source sector after transmitting the measurement report, WTRU 110 transmit an indication to the corresponding source cell that it has interrupted reception to that cell, this notification may be made by using one or a combination Ll, L2 or L3 signaling. [0067] Ll signaling is used, a special value of the CQI may be reported on the corresponding HS-DPCCH. Upon reception of this CQI value, the source Node-B stops scheduling data over the corresponding carrier. Alternatively, WTRU 110 may report a fictitious low CQI value, for example 0, which implicitly forces the Node-B to stop scheduling WTRU 110 on the corresponding carrier. [0068] Using L2 signaling for this notification includes transmitting a special reserved value of the SI to the source Node-B, or the message is appended to a MAC-i/is payload, using a special value of the logical channel identifier (LCH-ID) to indicate the presence of this message.
[0069] For L3 signaling, the measurement report may include the time at which WTRU 110 will stop monitoring the corresponding source carrier, the time at which it will stop monitoring the source anchor carrier as well. The RNC signals to the source Node-B to stop scheduling WTRU 110 in the source carrier. Alternatively, WTRU 110 may report the CFN at which the measurement report was transmitted and both the RNC and WTRU 110 are pre-configured with a time at which WTRU 110 should stop monitoring one carrier. A time in which the handover should be performed after the CFN at which the message was transmitted may also be included in the preconfiguration.
[0070] Once the handover indication is received by WTRU 110, WTRU 110 may then configure the supplementary carrier, or the anchor carrier in the target cell (if pre-configured) and stop monitoring the source cell.
[0071] In another alternative method for allowing WTRU 110 to perform reception on the target cells includes WTRU 110 ceasing monitoring the HS-SCCH on both cells in the source sector, and starting monitoring both carriers on the target sector. Alternatively, only the anchor carrier in the target cell is monitored until a handover indication is received.
[0072] The time at which WTRU 110 stops monitoring the source cells and starts monitoring the target cells may be signaled by WTRU 110 to the network (via the CFN). Alternatively, WTRU 110 may be configured to start monitoring the target cells at a predefined, or a configured amount of time after the measurement report is transmitted. In this case, WTRU 110 may then transmit the CFN at which the measurement report was prepared to the network to help synchronize the handover procedure.
[0073] An enhanced inter-frequency change method is disclosed wherein
WTRU 110 may change its anchor frequency and supplementary frequency, or swap the anchor frequency and supplementary frequency within the same sector using an enhanced carrier change or swap procedure. WTRU 110 may also perform a serving dual cell change with a simultaneous anchor frequency change. [0074] The method includes pre-configuring the current supplementary cell of the serving sector with DL/UL information required by WTRU 110 for potential use as an anchor cell. For example, WTRU 110 is pre-configured with the F-DPCH, E- AGCH, serving R-GCH, C-RNTI, E-RNTI(s), and other configurations required for WTRU 110 to configure another (or a supplementary) carrier as an anchor carrier. The network may also pre- configure the supplementary cells of all sectors in the active set with information required by WTRU 110 to use this frequency as an anchor cell, or to use this frequency for dual carrier uplink operation, such as secondary E-DCH serving cell information (i.e. E-AGCH, E-RGCH, E-HICH, F- DPCH, etc). The information is stored in WTRU 110 and deleted when the serving cell is removed from the active set. Alternatively, only a sub-set of the above mentioned parameters are pre-configured. WTRU 110 may use the same channelization codes and information which were configured in the anchor cell and apply the same configuration to the second frequency. Other parameters, for example, C-RNTI and E-RNTI(s) may also need to be pre-loaded. [0075] Alternatively, the supplementary carrier is pre-configured as an anchor carrier for all cells of the active set.
[0076] In accordance with this method, a measurement report may trigger a swap of the anchor frequency and supplementary frequency if a trigger occurs. This trigger may occur when the cell of the supplementary frequency is the best cell for a measurement report triggered by event ID message (i.e., a new cell in the supplementary frequency has become better than the current cell in the source supplementary, and optionally source anchor frequency), or another similar event, such as, an inter-frequency event, wherein the quality of the secondary cell has become better than the quality of the anchor cell by a configured threshold and for a configured amount of time.
[0077] The quality (e.g. CPICH Ec/No) of the anchor carrier is lower than a threshold or has been lower than a threshold for a pre-determined period of time may also be a trigger. Stated another way, the quality of the supplementary carrier is higher than a threshold for a predetermined period of time. The threshold may be a function of the CPICH Ec/No of the supplementary carrier. [0078] Another trigger may occur when the quality of the anchor carrier is lower than a first threshold and the quality of the supplementary carrier is higher than a second threshold. A combination of these in the measurement report may also trigger a frequency swap (i.e. an inter-frequency handover) or a serving cell change with a simulataneous change of anchor frequency.
[0079] When a measurement report is triggered according to one of the criteria mentioned above, this would result in WTRU 110 changing the anchor carrier frequency within the serving sector, if the anchor carrier and the supplementary carrier are swapped within the serving sector, or changing the anchor carrier frequency while changing the serving cell or sector at the same time. Once the measurement report has been triggered, WTRU 110 may continue to listen to both the anchor cell and the supplementary cell and wait for an HS-SCCH order, or handover indication, to indicate that the handover should be performed. The monitoring of the HS-SCCH should be performed according to one of the methods disclosed above.
[0080] Where WTRU 110 will not have a secondary UL configured at the end of the handover, at the time of handover message reception, WTRU 110 may stop listening to, or receiving, the DL control channels (i.e. F-DPCH, E-AGCH, E-HICH and E-RGCH) in the anchor frequency, continue the HS-SCCH and HS-DPSCH monitoring in the anchor carrier, and consider this carrier as the supplementary carrier. WTRU 110 may also reconfigure the supplementary carrier to start acting as an anchor carrier (e.g., WTRU 110 starts monitoring the F-DPCH, E-AGCH, E- RGCH, etc. in the new anchor carrier.), and start transmission of the DPCCH and HS-DPCCH in the new frequency.
[0081] WTRU 110 may also perform the synchronization procedure with the new frequency (i.e., synchronization A). If the handover results in a change of an UL carrier frequency, WTRU 110 starts the power control loop with the new UL frequency as soon as the handover is complete and the new physical channels (i.e. F- DPCH or DPCCH) are established. For the initial DPCCH power value, WTRU 110 may use the last DPCCH power used in the old anchor carrier with a possible addition of a network configurable DPCCH power offset.
[0082] If WTRU 110 does not support soft handover with radio links in different frequencies, then all configured DL radio links in the active set for the other cells in the previous frequency, other than the serving cell are autonomously released by WTRU 110.
[0083] The UL radio link may also be maintained if WTRU 110 maintains the same UL frequency.
[0084] The WTRU may wait for an RRC handover message to be configured with the new parameters for the new active set in the new carrier. [0085] In the case where UL dual carrier is configured, the changing of the used anchor frequency requires WTRU 110 to stop DPCCH and HS-DPCCH transmission in the old anchor carrier frequency and start transmission in the new anchor carrier frequency (i.e., the old supplementary frequency). The change when DC-HSUPA is configured or when the information if pre-configured in the target sector, requires less changes and thus it is much faster to perform. WTRU 110 continues to use the same configured physical channels and continues with the same active set, but changes the logical association from anchor to supplementary, and vice versa.
[0086] In another alternative, WTRU 110 may switch the anchor frequency with the supplementary frequency (i.e., the old anchor carrier is no longer being used). When the anchor frequency is switched, WTRU 110 may monitor only the supplementary carrier for a handover indication while continuing reception in the anchor carrier. Once a handover indication is received, WTRU 110 may stop listen to the old anchor frequency, and/or reconfigure the supplementary carrier to perform as an anchor carrier. For example, WTRU 110 starts monitoring the F- DPCH, E-AGCH, E-RGCH, etc. in the new anchor carrier.
[0087] WTRU 110 may also initiate the synchronization procedure with the new frequency. If the handover results in a change of the UL carrier frequency, WTRU 110 may start the power control loop with the new UL frequency as soon as the handover is complete. For the initial DPCCH power value, WTRU 110 may use the last DPCCH power used in the old anchor carrier with a possible addition of a network configurable DPCCH power offset.
[0088] If WTRU 110 does not support soft handover with radio links in different frequencies, all of the configured DL radio links in the active set for the other cells, other than the serving cell, are autonomously released by WTRU 110. It is an option to have the UL radio link be maintained if WTRU 110 maintains the same UL frequency.
[0089] WTRU 110 may also wait for an RRC handover message to be configured with the new parameters for the new active set in the new carrier and the new supplementary carrier. [0090] As indicated above, WTRU 110 may be configured with dual cell
HSDPA and HSUPA. Figure 4 illustrated three scenarios in which the Node B uses one or more of available frequencies to communicate with WTRU 110. Referring to Figure 4, in a first scenario, WTRU 110 is operating in single carrier operation and performing HS-DSCH and E-DCH reception, and in soft handover with NB 2 and 3. In an alternative, when NB (or cell) 2 and 3 are added to the active set, since they have dual carrier capabilities, WRU 110 is preconfigured with primary serving cell information. WTRU 110 may also be preconfigured with secondary HS-DSCH and E-DCH serving cell information. This preconfigured information may include, but is not limited to, E-AGCH, E-RGCH, HS-SCCH, H-RNTI, E-RNTI, F-DPCH, etc. Alternatively, only the secondary HS-DSCH serving cell pre- configuration is provided.
[0091] As WTRU 110 moves from scenario 1 to scenario 2 in Figure 4, a change of best cell occurs (i.e., event ID is triggered). When only the secondary HS- DSCH serving cell information is provided, WTRU 110 monitors the anchor HS- DSCH serving cell for a handover indication. If a handover indication is received, WTRU 110 performs a fast serving cell change to both the primary and secondary HS-DSCH serving cell. In the case where both secondary HS-DSCH and E-DCH serving cell information are preconfigured, WTRU 110, after receiving the HS- SCCH order over the anchor frequency, configures primary and secondary HS- DSCH reception and starts both primary and secondary E-DCH transmission. WTRU 110 may perform a synchronization procedure on the secondary carrier when the serving cell(s) change is performed. This is due to the fact that no ongoing secondary E-DCH transmission was available in the source cells. [0092] In an alternative, the RRC configures the secondary E-DCH transmission parameters, but transmission over the secondary E-DCH does not start until an HS-SCCH order activating the secondary carrier is received by WTRU 110. The secondary active set is updated by the network according the measurements sent by WTRU 110. In the case where, one of the cells in the secondary active set is not present in the anchor active set (like NB 4 in Figure 4 above), the network may provide WTRU 110 with a set of pre-configured secondary E-DCH serving cell parameters and a set of HS-DSCH parameters for cell 4. Alternatively, the network may pre-configure WTRU 110 with all parameters for this carrier to become an anchor carrier if necessary.
[0093] As WTRU 110 moves from scenario 2 to scenario 3, where an event ID is triggered and the best cell is a cell that only belongs to the secondary frequency and no primary cell is present, a fast frequency change may occur. Once WTRU 110 triggers a measurement report with event ID, indicating the cell 4 as the best cell, WTRU 110 continues monitoring the source HS-DSCH and the source E-DCH cell and simultaneously the first HS-SCCH set provided in the preconfigured secondary carrier information. Upon reception of an order over the HS-SCCH in the secondary frequency, WTRU 110 may perform a serving cell change to cell 4 and at the same time a fast primary frequency change. Since WTRU 110 is already synchronized on the secondary carrier and already has an active set, WTRU 110 may continue transmission over the new primary serving cells without the need to perform a synchronization procedure. The radio links previously established in fl are released, and WTRU 110 performs only single carrier operation. The preconfigured information for the cells in the active set of the fl carrier may be maintained and stored in WTRU 110 and treated as secondary pre-configured HS-DSCH and E-DCH serving cell information.
[0094] IfWTRU 110 is in scenario 2 (i.e., in cell 2) and a change of serving cell is detected (i.e. event ID) and the new best cell could be in the secondary frequency (i.e. f2), WTRU 110 may receive a serving change command that performs a serving cell change and also a change of anchor and secondary carrier. In this case, WTRU 110 may monitor the target anchor HS-DSCH cell for a handover indication and perform the handover to the secondary carrier. Alternatively, WTRU 110 may monitor both target anchor and secondary HS-DSCH, and if the order is received over the anchor HS-DSCH cell WTRU 110 performs a serving cell change, while keeping the same anchor carrier. In another alternative, if the order is received over the secondary HS-DSCH cell, WTRU 110 performs a serving cell change and configures the secondary frequency (f2) as the anchor carrier of WTRU 110 and starts all anchor carrier operations, such as transmission of DPCCH and HS- DPCCH over this new frequency. The active sets of fl and f2 are maintained and no synchronization procedures need to be initiated. [0095] Embodiments
1. A method for implementing a serving cell change in a multi-cell wireless transmit receive unit (WTRU), the method comprising: adding a cell to an active set; receiving serving cell information to preconfigure a primary and secondary serving cell for the added cell; and storing the serving cell information.
2. The method of embodiment 1 further comprising: monitoring at least one of the preconfigured primary and secondary serving cells for a handover indication; and on the condition that a handover indication is received, performing a serving cell change to the primary and secondary serving cells from a source primary and secondary serving cell using the preconfigured serving cell information.
3. The method as in any one of the preceeding embodiments, wherein the serving cell information of the preconfigured secondary serving cell includes a secondary high-speed downlink shared channel (HS-DSCH) serving cell information, high-speed shared control channel (HS-SCCH), HS-DSCH radio network transaction identifier (H-RNTI) of the preconfigured secondary serving cell.
4. The method as in any one of the preceeding embodiments, wherein the preconfigured primary serving cell is monitored.
5. The method as in any one of embodiments 2 - 4, wherein performing serving cell change includes reconfiguring a primary serving cell and the HS-DSCH of a secondary serving cell using the preconfigured information.
6. The method as in any one of embodiments 2 - 5, wherein performing serving cell change includes reconfiguring an enhanced dedicated channel (E-DCH).
7. The method of embodiment 6, further comprising initiating E-DCH transmission. 8. The method of embodiment 7, wherein E-DCH transmission is initiated on the condition that a source secondary cell was transmitting the E-DCH prior to serving cell change.
9. The method as in any one of embodiments 6 - 8, wherein E-DCH transmission is initiated on the condition that an HS-SCCH order activating a secondary E-DCH is received.
10. The method as in any preceeding embodiments, wherein the serving cell information is received during an active set update procedure.
11. The method as in any preceeding embodiments, further comprising: determining whether a change of a best cell has occurred; and on the condition that a change of the best cell has occurred, transmitting a measurement report.
12. The method as in any one of embodiments 2 — 11, further comprising: ceasing to receive the HS-DSCH on the source primary and secondary serving cells; and starting to monitor the preconfigured primary and secondary serving cells.
13. The method as in any one of embodiments 2 - 11, further comprising: ceasing to receive the HS-DSCH on the source primary and secondary serving cells; and starting to monitor one of the preconfigured primary and secondary serving cells.
14. The method as in any one of embodiments 12 — 13, further comprising transmitting an indication to the source primary or secondary serving cell where receipt of the HS-DSCH has ceased.
15. The method as in embodiment 14, wherein the indication is transmitted using layer 1 signaling.
16. The method of embodiment 15, wherein a special value of a channel quality indicator (CQI) is reported on the HS-DPCCH to the source primary or secondary serving cell.
17. The method as in any one of embodiments 14 - 16, wherein the indication is transmitted using layer 2 signaling. 18. The method as in any one of embodiments 14 — 17, wherein a special reserved value of a System Information (SI) is transmitted to the source primary or secondary serving cell.
19. The method as in any one of embodiments 14 - 18, wherein the indication is transmitted using layer 3 signaling.
20. The method as in any one of embodiments 14 - 19, wherein a measurement report includes a time at which the source primary or secondary serving cell will stop being monitored.
21. The method as in any one of the preceding embodiments, further comprising changing at least one of a source primary frequency and a source secondary frequency.
22. The method of embodiment 21 further comprising pre-configuring the source secondary serving cell with downlink/uplink (DL/UL) information for use as the source primary serving cell.
23. A wireless transmit receive unit (WTRU) configured to implement the method as in any one of embodiments 1- 22.
24. The WTRU of embodiment 23 configured with dual cell High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA).
25. A Node B configured of implement the method as in any one of embodiments 1 - 22.
26. A processor configured to implement the method as in any one of embodiments 1 — 22.
[0096] Although the disclosure is described within the context of 3GPP
WCDMA systems, it should be understood that it is applicable to any wireless communications system that can support dual (or multi) cell (or carrier) operations. [0097] Although features and elements are described above in particular combinations, each feature or element can be used alone without the other features and elements or in various combinations with or without other features and elements. The methods or flow charts provided herein may be implemented in a computer program, software, or firmware incorporated in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of computer-readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
[0098] Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
[0099] A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light -emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) or Ultra Wide Band (UWB) module.

Claims

CLAIMSWhat is claimed is:
1. A method for implementing a serving cell change in a multi-cell wireless transmit receive unit (WTRU), the method comprising: adding a cell to an active set; receiving serving cell information to preconfigure a primary and secondary serving cell for the added cell; and storing the serving cell information.
2. The method of claim 1 further comprising: monitoring at least one of the preconfigured primary and secondary serving cells for a handover indication; and on the condition that a handover indication is received, performing a serving cell change to the preconfigured primary and secondary serving cells from a source primary and secondary serving cell using the preconfigured serving cell information.
3. The method of claim 1 wherein the serving cell information of the preconfigured secondary cell includes a secondary high-speed downlink shared channel (HS-DSCH) serving cell information, high-speed shared control channel (HS-SCCH), HS-DSCH radio network transaction identifier (H-RNTI) of the preconfigured secondary serving cell.
4. The method of claim 2, wherein the preconfigured primary serving cell is monitored.
5. The method of claim 4, wherein performing serving cell change includes reconfiguring a primary serving cell and the HS-DSCH of a secondary serving cell using the preconfigured information.
6. The method of claim 5, wherein performing serving cell change includes reconfiguring an enhanced dedicated channel (E-DCH).
7. The method of claim 6, further comprising initiating E-DCH transmission.
8. The method of claim 7, wherein E-DCH transmission is initiated on the condition that the source secondary serving cell was transmitting the E-DCH prior to serving cell change.
9. The method of claim 6, wherein E-DCH transmission is initiated on the condition that an HS-SCCH order activating a secondary E-DCH is received.
10. A multi-cell wireless transmit receive unit (WTRU) configured to implement seriving cell change comprising: a receiver configured to receive serving cell information of an added cell; a processor configured to preconfigure a primary and secondary serving cell for the added cell and store the serving cell information.
11. The WTRU of claim 10, wherein the receiver is configured to monitor at least one of the preconfigured primary and secondary serving cells for a handover indication; and the processor, on the condition that a handover indication is received by the receiver, is configured to perform a serving cell change to the primary and secondary serving cells from source primary and secondary serving cells using the preconfigured serving cell information.
12. The WTRU of claim 10, wherein the serving cell information of the preconfigured secondary cell includes a secondary high-speed downlink shared channel (HS-DSCH) serving cell information, high-speed shared control channel (HS-SCCH), HS-DSCH radio network transaction identifier (H-RNTI) of the preconfigured secondary serving cell.
13. The WTRU of claim 11 , wherein the preconfigured primary serving cell is monitored by the receiver.
14. The WTRU of claim 13, wherein a primary serving cell and a HS- DSCH of a secondary serving cell is reconfigured using the preconfigured information.
PCT/US2009/047891 2008-06-19 2009-06-19 Optimized serving dual cell change WO2009155480A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP09767789.2A EP2292044B1 (en) 2008-06-19 2009-06-19 Optimized serving dual cell change
JP2011514827A JP5059971B2 (en) 2008-06-19 2009-06-19 Optimized serving dual cell change
CN200980123281.7A CN102067672B (en) 2008-06-19 2009-06-19 Optimized serving dual cell change
KR1020147016335A KR101633202B1 (en) 2008-06-19 2009-06-19 Optimized serving dual cell change
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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2285159A1 (en) * 2009-08-13 2011-02-16 Alcatel Lucent Anchor carrier handover
CN102083153A (en) * 2010-08-12 2011-06-01 大唐移动通信设备有限公司 Method and device for replacement of main cell
CN102083154A (en) * 2010-11-05 2011-06-01 大唐移动通信设备有限公司 Method for processing secondary cell allocation during switching and device thereof
WO2011098308A1 (en) 2010-02-11 2011-08-18 Alcatel Lucent Inter-node b serving hs-dsch cell change with target cell pre-configuration and signaling of alternative configuration information to user equipment
EP2375850A1 (en) * 2010-04-06 2011-10-12 Alcatel Lucent Controlling communications in a multi-carrier wireless communication system
WO2011134401A1 (en) * 2010-04-30 2011-11-03 华为技术有限公司 Method for processing cell outage and device thereof
WO2012006122A1 (en) 2010-06-28 2012-01-12 Qualcomm Incorporated Mobility in a multi-point hsdpa communication network
WO2012019549A1 (en) * 2010-08-11 2012-02-16 电信科学技术研究院 A cell deployment method and device for replacing pcells
WO2012034035A1 (en) * 2010-09-09 2012-03-15 Qualcomm Incorporated Dynamic switching between dc-hsdpa and sfdc-hsdpa
CN102469537A (en) * 2010-11-03 2012-05-23 中兴通讯股份有限公司 Service HS-DSCH cell switching method in MIMO system and system thereof
JP2012516086A (en) * 2009-01-23 2012-07-12 華為技術有限公司 Method, apparatus and system for managing uplink carrier frequency
EP2557843A1 (en) * 2011-08-12 2013-02-13 Alcatel Lucent Network node configuration
WO2013048325A1 (en) * 2011-09-30 2013-04-04 Telefonaktiebolaget L M Ericsson (Publ) A radio network controller, a user equipment, a radio network node, and methods therein
GB2496204A (en) * 2011-11-07 2013-05-08 Renesas Mobile Corp Enabling mobility in a downlink packet access service
EP2628350A1 (en) * 2010-10-13 2013-08-21 1/6 Qualcomm Incorporated Communicating between user equipment (ue) and independent serving sectors in a wireless communications system
JP2013543352A (en) * 2010-11-08 2013-11-28 クアルコム,インコーポレイテッド System and method for multipoint HSDPA communication utilizing multilink PDCP sublayer
WO2013158363A3 (en) * 2012-04-17 2014-03-20 Qualcomm Incorporated Communication in a heterogeneous network with carrier aggregation
WO2014074217A1 (en) * 2012-11-07 2014-05-15 Qualcomm Incorporated Method and apparatus for pre-configuring for a serving cell change to neighbor cells
US8737211B2 (en) 2011-08-03 2014-05-27 Qualcomm Incorporated Methods and apparatuses for network configuration of user equipment communication modes in multiflow systems
WO2014090283A1 (en) * 2012-12-11 2014-06-19 Nokia Solutions And Networks Oy Liquid small cell radio link in dl for multiflow with hetnets
US8874117B2 (en) 2010-05-04 2014-10-28 Motorola Mobility Llc Handover during carrier aggregation operation in wireless communication network
US8891356B2 (en) 2010-06-28 2014-11-18 Qualcomm Incorporated System and method for multi-point HSDPA communication utilizing a multi-link RLC sublayer
US9125098B2 (en) 2011-08-03 2015-09-01 Qualcomm Incorporated Method and apparatus for flow congestion control in multiflow networks
EP2955972A1 (en) * 2010-10-01 2015-12-16 Interdigital Patent Holdings, Inc. Method for and apparatus for simultaneous reception of downlink shared channels from multiple cells
EP2541988A4 (en) * 2010-02-25 2016-01-06 Sony Corp Method for controlling handovers, terminal device, base station, and wireless communications system
JP2016054518A (en) * 2010-10-01 2016-04-14 テレフオンアクチーボラゲット エルエム エリクソン(パブル) Positioning measurements and carrier switching in multi-carrier wireless communication network
EP2490499A4 (en) * 2010-01-15 2017-07-26 ZTE Corporation Method and system for delivering and acquiring secondary carrier pair information
WO2018030943A1 (en) * 2016-08-11 2018-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Methods switching frequencies of primary and secondary carriers for multi-carrier communications and related wireless devices and network nodes
US10404349B2 (en) 2011-10-04 2019-09-03 Telefonaktiebolaget Lm Ericsson (Publ) Methods and devices for configuring uplink transmission diversity

Families Citing this family (49)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8687589B2 (en) * 2008-08-13 2014-04-01 Qualcomm Incorporated Neighbor cell search on a secondary carrier
US8369289B2 (en) * 2008-08-14 2013-02-05 Sony Mobile Communications Ab Reuse of training sequence between frequency-adjacent radio signals
KR101682034B1 (en) 2008-08-18 2016-12-05 삼성전자주식회사 Apparatus and method for using secondary frequency assignment optionnally in a wireless communication system using multiple band
US9320039B2 (en) * 2008-10-31 2016-04-19 Unwired Planet, Llc Method and arrangement for user equipment switching between carriers in different frequency bands
EP2384052A1 (en) * 2009-01-16 2011-11-02 Sharp Kabushiki Kaisha Mobile station apparatus, base station apparatus, handoff method, and mobile communication system
KR101652841B1 (en) * 2009-02-02 2016-08-31 삼성전자 주식회사 Method and apparatus for controllling radio link in cellular communication systems supporting carrier aggregation
WO2011100673A1 (en) * 2010-02-12 2011-08-18 Interdigital Patent Holdings, Inc. Method and apparatus for enhancing cell-edge user performance and signaling radio link failure conditions via downlink cooperative component carriers
US8774164B2 (en) * 2009-02-25 2014-07-08 At&T Mobility Ii Llc Adaptive R99 and HS PS (high speed packet-switched) link diversity for coverage and capacity enhancement of circuit-switched calls
US8989105B2 (en) 2009-03-17 2015-03-24 Htc Corporation Method of establishing multiple links with multiple component carriers and related communication device
US8989107B2 (en) * 2009-04-30 2015-03-24 Qualcomm Incorporated Activation deactivation of secondary UL carrier in DC HSUPA
BRPI1013144B1 (en) * 2009-06-15 2021-03-02 Guangdong Oppo Mobile Telecommunications Corp., Ltd method and system for the discontinuous reception operation for the aggregation of an advanced carrier of long-term evolution
WO2010146226A1 (en) * 2009-06-19 2010-12-23 Nokia Corporation Method and apparatus for managing carrier measurements
US8537778B1 (en) * 2009-06-25 2013-09-17 Sprint Spectrum L.P. Methods and systems for initiating a handoff based on EV-DO DRCLock
ES2360329B1 (en) * 2009-07-14 2012-05-08 Vodafone España, S.A.U. METHOD AND CONTROLLER OF RADIO NETWORK TO SELECT A TRANSMISSION TECHNOLOGY FOR COMMUNICATIONS IN MOBILE NETWORKS OF �? WIDE AREA.
US8897258B2 (en) * 2009-07-15 2014-11-25 Electronics And Telecommunications Research Institute Method of transmitting data for reducing interference in hierarchical cell structure
US8942209B2 (en) * 2009-08-12 2015-01-27 Qualcomm Incorporated Systems and methods for supporting an enhanced serving cell change when moving among different cell types
CN101998615B (en) * 2009-08-17 2014-06-11 中兴通讯股份有限公司 Synchronization method of auxiliary carrier cells and terminal
US8964536B2 (en) * 2009-10-05 2015-02-24 Qualcomm Incorporated Apparatus and method for dynamic load balancing in a multi-carrier wireless communication system
US8494453B2 (en) * 2009-11-03 2013-07-23 Htc Corporation Method of handling measurement and related communication device
KR101607129B1 (en) * 2010-01-28 2016-03-29 삼성전자주식회사 Apparatus and method for determining handover in mobile communication system
JP5192503B2 (en) * 2010-02-25 2013-05-08 株式会社エヌ・ティ・ティ・ドコモ Information transmission method, base station apparatus and mobile station apparatus
US8456989B1 (en) * 2010-06-30 2013-06-04 Sprint Spectrum L.P. Method and system for using supplemental channels for a communication session
US8675513B1 (en) 2010-06-30 2014-03-18 Sprint Spectrum L.P. Method and system for using multi-channel communication links
US9210624B2 (en) * 2010-08-17 2015-12-08 Google Technology Holdings LLC Method and apparatus for change of primary cell during carrier aggregation
US8693437B2 (en) * 2010-09-14 2014-04-08 Htc Corporation Method of configuring secondary cells and related communication device
US20120106511A1 (en) * 2010-11-03 2012-05-03 Chih-Hsiang Wu Method of Handling Primary Serving Cell Change
CN102325005B (en) * 2011-07-18 2017-06-27 中兴通讯股份有限公司 A kind of implementation of terminal-pair HS SCCH orders, system and terminal
CN103036637B (en) * 2011-09-30 2017-04-12 中兴通讯股份有限公司 Method for activating multi-flow transmission user equipment (UE) to transmit high speed (HS)- dedicated physical control channel (DPCCH) and UE
US9137717B2 (en) * 2012-01-13 2015-09-15 Qualcomm Incorporated Method and apparatus for managing mobility events in a dual-frequency dual-cell wireless communication network
WO2014017767A1 (en) * 2012-07-23 2014-01-30 엘지전자 주식회사 Method for operating serving cell in wireless communication system to which carrier aggregation scheme is applied and device for same
US20140038605A1 (en) * 2012-07-31 2014-02-06 Firouz Behnamfar Devices and methods for cellular communication
CN104115523B (en) * 2012-10-30 2018-10-09 华为技术有限公司 Public Enhanced-DedicatedChannel Relative Grant Channels E-RGCH information interacting methods, device and system
WO2014071620A1 (en) * 2012-11-09 2014-05-15 华为技术有限公司 Method for uplink softer handover, ue and base station
CN108200621B (en) * 2012-12-28 2021-07-16 日本电气株式会社 Radio communication system, radio terminal, communication control method, and computer-readable medium
WO2014193354A1 (en) * 2013-05-29 2014-12-04 Intel Corporation Time-sliced wifi associations for make-before-break handover
WO2014190524A1 (en) * 2013-05-30 2014-12-04 华为技术有限公司 Method and device for switching cells
US20150038148A1 (en) * 2013-08-01 2015-02-05 Electronics And Telecommunications Research Institute Method and apparatus for handover based on cooperation between base stations
KR102236524B1 (en) * 2013-09-27 2021-04-06 팬텍 주식회사 Method and apparatus for performing change of serving cell in wireless communication system using dual connectivity
KR102287928B1 (en) 2013-09-27 2021-08-10 삼성전자 주식회사 Method and apparatus for transmitting and receiving a data using a plurality of carriers in mobile communication system
EP3120658B1 (en) * 2014-03-21 2018-06-20 Telefonaktiebolaget LM Ericsson (publ) Apparatus and methods for decoupling an uplink enhanced dedicated channel and high speed downlink shared channel
CA2948061A1 (en) 2014-05-06 2015-11-12 Huawei Technologies Co., Ltd. Channel boundary locating method, base station, and user equipment
CN105578551B (en) * 2014-10-08 2019-12-27 展讯通信(上海)有限公司 Cell switching selection method and mobile terminal
US10028279B2 (en) * 2014-12-19 2018-07-17 Futurewei Technologies, Inc. Communications in a wireless network for carrier selection and switching
US11812321B2 (en) * 2015-10-21 2023-11-07 Qualcomm Incorporated Autonomous handover on a shared communication medium
EP3456124B1 (en) * 2016-05-13 2020-01-01 Telefonaktiebolaget LM Ericsson (publ) Tti switching for multicarrier hsupa
US10405281B1 (en) * 2017-06-15 2019-09-03 Sprint Communications Company L.P. Dynamic minimum receiver levels based on carrier aggregation
EP3627878B1 (en) * 2017-07-20 2023-08-30 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Measurement configuration
US20190327655A1 (en) * 2018-04-23 2019-10-24 Mediatek Inc. Methods And Apparatus For Selecting Large-Bandwidth Cell In Mobile Communications
CN109348510B (en) * 2018-10-17 2021-11-19 中国联合网络通信集团有限公司 Load balancing method, device and base station

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1773009A2 (en) * 2005-10-06 2007-04-11 Samsung Electronics Co., Ltd. Mobile communications cell changing procedure
US20070097918A1 (en) * 2005-10-27 2007-05-03 Motorola, Inc. Mobility enhancement for real time service over high speed downlink packet access (hsdpa)

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US699333A (en) * 1900-10-03 1902-05-06 Albert Ludwig Vessel for the reception of high-pressure gases.
US6535739B1 (en) * 2000-04-07 2003-03-18 Qualcomm Incorporated Method of handoff within a telecommunications system containing digital base stations with different spectral capabilities
US6993333B2 (en) 2003-10-16 2006-01-31 Flarion Technologies, Inc. Methods and apparatus of improving inter-sector and/or inter-cell handoffs in a multi-carrier wireless communications system
US7308264B2 (en) 2004-02-05 2007-12-11 Interdigital Technology Corporation Method for identifying pre-candidate cells for a mobile unit operating with a switched beam antenna in a wireless communication system, and corresponding system
GB2416269A (en) * 2004-04-16 2006-01-18 Nokia Corp Cell selection and re-selection
JP2005328525A (en) * 2004-05-04 2005-11-24 Samsung Electronics Co Ltd Method and apparatus for selecting optimal scheduling cells for soft handover terminal in uplink packet transmission system
KR100933156B1 (en) * 2004-08-12 2009-12-21 삼성전자주식회사 Method and apparatus for transmitting and receiving uplink data in handoff area using transport channels for uplink service
KR100884989B1 (en) 2004-09-29 2009-02-20 노키아 코포레이션 Active set update ASU with high speed downlink shared channel HS-DSCH information
JP4840326B2 (en) 2005-03-28 2011-12-21 ソニー株式会社 Mobile terminal
US8050222B2 (en) * 2005-03-28 2011-11-01 Sony Corporation Mobile communications system, handover controlling method, radio network controller, and mobile terminal
US8031673B2 (en) * 2005-06-03 2011-10-04 Telefonaktiebolaget Lm Ericsson (Publ) Cell change in cellular networks
KR101256155B1 (en) * 2005-08-19 2013-04-19 지티이 코포레이션 Method for implement hsdpa for td-scdma
EP1781057A1 (en) * 2005-10-26 2007-05-02 Matsushita Electric Industrial Co., Ltd. Fast radio bearer establishment in a mobile communication system
JP4895603B2 (en) 2005-12-22 2012-03-14 京セラ株式会社 Communication control system, radio communication terminal and communication control method
JP4789613B2 (en) 2005-12-22 2011-10-12 京セラ株式会社 Wireless communication terminal and communication method
US20080005797A1 (en) * 2006-06-30 2008-01-03 Microsoft Corporation Identifying malware in a boot environment
PT1886585E (en) * 2006-07-24 2008-11-03 Unilever Nv Improved beverage
US8660558B2 (en) * 2006-08-22 2014-02-25 Telefonaktiebolaget L M Ericsson (Publ) Method for load balancing of devices in idle mode
JP4797888B2 (en) * 2006-08-31 2011-10-19 株式会社日立製作所 Wireless communication system, control node, and base station for communication using a plurality of wireless resources
EP1915016A3 (en) 2006-10-20 2010-08-04 Innovative Sonic Limited Method and apparatus for setting configurations of uplink transport channel in a wireless communications system
US8094554B2 (en) * 2006-10-26 2012-01-10 Qualcomm Incorporated Compressed mode operation and power control with discontinuous transmission and/or reception
US20080200202A1 (en) * 2007-02-13 2008-08-21 Qualcomm Incorporated Power control with link imbalance on downlink and uplink
US8670762B2 (en) * 2007-04-18 2014-03-11 Qualcomm Incorporated Fast serving cell change
US7983215B2 (en) * 2008-04-17 2011-07-19 Infineon Technologies Ag Communication device, method for transmitting an uplink transmission control message, method for receiving an uplink transmission control message

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1773009A2 (en) * 2005-10-06 2007-04-11 Samsung Electronics Co., Ltd. Mobile communications cell changing procedure
US20070097918A1 (en) * 2005-10-27 2007-05-03 Motorola, Inc. Mobility enhancement for real time service over high speed downlink packet access (hsdpa)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ERICSSON; QUALCOMM EUROPE: "Text Proposal for DC-HSDPA assumptions and standards impact", 3GPP DRAFT; R1-082249 TEXT PROPOSAL FOR DC-HSDPA ASSUMPTIONS AND STANDARDS IMPACT, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Kansas City, USA; 20080523, 23 May 2008 (2008-05-23), XP050110541 *

Cited By (71)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9717081B2 (en) 2009-01-23 2017-07-25 Huawei Technologies Co., Ltd. Method, device, and system for managing uplink carrier frequencies
US9210704B2 (en) 2009-01-23 2015-12-08 Huawei Technologies Co., Ltd. Method, device, and system for managing uplink carrier frequencies
JP2012516086A (en) * 2009-01-23 2012-07-12 華為技術有限公司 Method, apparatus and system for managing uplink carrier frequency
EP2285159A1 (en) * 2009-08-13 2011-02-16 Alcatel Lucent Anchor carrier handover
EP2490499A4 (en) * 2010-01-15 2017-07-26 ZTE Corporation Method and system for delivering and acquiring secondary carrier pair information
RU2522167C2 (en) * 2010-02-11 2014-07-10 Алькатель Люсент Inter-node b serving hs-dsch cell change with target cell pre-configuration and signalling of alternative configuration information to user equipment
WO2011098308A1 (en) 2010-02-11 2011-08-18 Alcatel Lucent Inter-node b serving hs-dsch cell change with target cell pre-configuration and signaling of alternative configuration information to user equipment
JP2013516825A (en) * 2010-02-11 2013-05-13 アルカテル−ルーセント Communication configuration
EP2541988A4 (en) * 2010-02-25 2016-01-06 Sony Corp Method for controlling handovers, terminal device, base station, and wireless communications system
US10368280B2 (en) 2010-02-25 2019-07-30 Sony Corporation Method for controlling handover, user equipment, base station, and radio communication system
US9351204B2 (en) 2010-02-25 2016-05-24 Sony Corporation Method for controlling handover, user equipment, base station, and radio communication system
EP3471460A1 (en) * 2010-02-25 2019-04-17 Sony Corporation Method for controlling handover, user equipment, base station, and radio communication system
US10932172B2 (en) 2010-02-25 2021-02-23 Sony Corporation Method for controlling handover, user equipment, base station, and radio communication system
US10034206B2 (en) 2010-04-06 2018-07-24 Wsou Investments, Llc Controlling communications in a multi-carrier wireless communication system
CN102835181A (en) * 2010-04-06 2012-12-19 阿尔卡特朗讯 Controlling communications in a multi-carrier wireless communication system
KR101409163B1 (en) * 2010-04-06 2014-06-19 알까뗄 루슨트 Controlling communications in a multi-carrier wireless communication system
CN102835181B (en) * 2010-04-06 2016-05-11 阿尔卡特朗讯 Be used for the method for the communication of controlling multi-carrier wireless communications system and relevant network node
WO2011124314A1 (en) * 2010-04-06 2011-10-13 Alcatel Lucent Controlling communications in a multi-carrier wireless communication system
EP2375851A1 (en) * 2010-04-06 2011-10-12 Alcatel Lucent Controlling communications in a multi-carrier wireless communication system
JP2014212572A (en) * 2010-04-06 2014-11-13 アルカテル−ルーセント Controlling communication in multi-carrier wireless communication system
EP2375850A1 (en) * 2010-04-06 2011-10-12 Alcatel Lucent Controlling communications in a multi-carrier wireless communication system
US10271231B2 (en) 2010-04-30 2019-04-23 Huawei Technologies Co., Ltd. Method and device for handling cell outage
CN102238595A (en) * 2010-04-30 2011-11-09 华为技术有限公司 Method and equipment for processing cell outage
US9301250B2 (en) 2010-04-30 2016-03-29 Huawei Technologies Co., Ltd. Method and device for handling cell outage
WO2011134401A1 (en) * 2010-04-30 2011-11-03 华为技术有限公司 Method for processing cell outage and device thereof
US10659979B2 (en) 2010-04-30 2020-05-19 Huawei Technologies Co., Ltd. Method and device for handling cell outage
US8874117B2 (en) 2010-05-04 2014-10-28 Motorola Mobility Llc Handover during carrier aggregation operation in wireless communication network
US10154469B2 (en) 2010-05-04 2018-12-11 Google Technology Holdings LLC Handover during carrier aggregation operation in wireless communication network
CN102960022B (en) * 2010-06-28 2016-03-09 高通股份有限公司 Mobility in multi-point HSDPA communication network
KR101486411B1 (en) 2010-06-28 2015-01-26 퀄컴 인코포레이티드 Mobility in a multi-point hsdpa communication network
US8989140B2 (en) 2010-06-28 2015-03-24 Qualcomm Incorporated System and method for mobility in a multi-point HSDPA communication network
CN102960022A (en) * 2010-06-28 2013-03-06 高通股份有限公司 Mobility in a multi-point hsdpa communication network
JP2013535177A (en) * 2010-06-28 2013-09-09 クアルコム,インコーポレイテッド System and method for mobility in a MULTI-POINTHSDPA communication network
US8891356B2 (en) 2010-06-28 2014-11-18 Qualcomm Incorporated System and method for multi-point HSDPA communication utilizing a multi-link RLC sublayer
WO2012006122A1 (en) 2010-06-28 2012-01-12 Qualcomm Incorporated Mobility in a multi-point hsdpa communication network
KR101437535B1 (en) * 2010-08-11 2014-09-04 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 A cell deployment method and device for replacing pcells
WO2012019549A1 (en) * 2010-08-11 2012-02-16 电信科学技术研究院 A cell deployment method and device for replacing pcells
CN102083153A (en) * 2010-08-12 2011-06-01 大唐移动通信设备有限公司 Method and device for replacement of main cell
JP2013541277A (en) * 2010-09-09 2013-11-07 クアルコム,インコーポレイテッド Dynamic switching between DC-HSDPA and SFDC-HSDPA
WO2012034035A1 (en) * 2010-09-09 2012-03-15 Qualcomm Incorporated Dynamic switching between dc-hsdpa and sfdc-hsdpa
KR101575173B1 (en) * 2010-09-09 2015-12-08 퀄컴 인코포레이티드 Dynamic switching between dc-hsdpa and sfdc-hsdpa
CN103125134A (en) * 2010-09-09 2013-05-29 高通股份有限公司 Dynamic switching between DC-HSDPA and SFDC-HSDPA
US9191867B2 (en) 2010-09-09 2015-11-17 Qualcomm Incorporated Dynamic switching between DC-HSDPA and SFDC-HSDPA
JP2016054518A (en) * 2010-10-01 2016-04-14 テレフオンアクチーボラゲット エルエム エリクソン(パブル) Positioning measurements and carrier switching in multi-carrier wireless communication network
EP2955972A1 (en) * 2010-10-01 2015-12-16 Interdigital Patent Holdings, Inc. Method for and apparatus for simultaneous reception of downlink shared channels from multiple cells
US9913270B2 (en) 2010-10-01 2018-03-06 Interdigital Patent Holdings, Inc. Method and apparatus for fast assistive transmission operation
US10342007B2 (en) 2010-10-01 2019-07-02 Interdigital Patent Holdings, Inc. Method and apparatus for fast assistive transmission operation
US9356750B2 (en) 2010-10-01 2016-05-31 Interdigital Patent Holdings, Inc. Method and apparatus for fast assistive transmission operation
EP2628350A1 (en) * 2010-10-13 2013-08-21 1/6 Qualcomm Incorporated Communicating between user equipment (ue) and independent serving sectors in a wireless communications system
CN102469537A (en) * 2010-11-03 2012-05-23 中兴通讯股份有限公司 Service HS-DSCH cell switching method in MIMO system and system thereof
CN102083154A (en) * 2010-11-05 2011-06-01 大唐移动通信设备有限公司 Method for processing secondary cell allocation during switching and device thereof
US8989004B2 (en) 2010-11-08 2015-03-24 Qualcomm Incorporated System and method for multi-point HSDPA communication utilizing a multi-link PDCP sublayer
JP2013543352A (en) * 2010-11-08 2013-11-28 クアルコム,インコーポレイテッド System and method for multipoint HSDPA communication utilizing multilink PDCP sublayer
US9125098B2 (en) 2011-08-03 2015-09-01 Qualcomm Incorporated Method and apparatus for flow congestion control in multiflow networks
US8737211B2 (en) 2011-08-03 2014-05-27 Qualcomm Incorporated Methods and apparatuses for network configuration of user equipment communication modes in multiflow systems
WO2013023734A1 (en) * 2011-08-12 2013-02-21 Alcatel Lucent Network node configuration
EP2557843A1 (en) * 2011-08-12 2013-02-13 Alcatel Lucent Network node configuration
WO2013048325A1 (en) * 2011-09-30 2013-04-04 Telefonaktiebolaget L M Ericsson (Publ) A radio network controller, a user equipment, a radio network node, and methods therein
US9462512B2 (en) 2011-09-30 2016-10-04 Telefonaktiebolaget Lm Ericsson (Publ) Radio network controller, a user equipment, a radio network node and methods therein
US10404349B2 (en) 2011-10-04 2019-09-03 Telefonaktiebolaget Lm Ericsson (Publ) Methods and devices for configuring uplink transmission diversity
GB2496204A (en) * 2011-11-07 2013-05-08 Renesas Mobile Corp Enabling mobility in a downlink packet access service
WO2013068923A1 (en) * 2011-11-07 2013-05-16 Renesas Mobile Corporation Enabling mobility for hsdpa multiflow
US9320062B2 (en) 2012-04-17 2016-04-19 Qualcomm Incorporated Communication in a heterogeneous network with carrier aggregation
US9867100B2 (en) 2012-04-17 2018-01-09 Qualcomm Incorporated Communication in a heterogeneous network with carrier aggregation
KR101719890B1 (en) 2012-04-17 2017-03-24 퀄컴 인코포레이티드 Communication in a heterogeneous network with carrier aggregation
KR20150003734A (en) * 2012-04-17 2015-01-09 퀄컴 인코포레이티드 Communication in a heterogeneous network with carrier aggregation
WO2013158363A3 (en) * 2012-04-17 2014-03-20 Qualcomm Incorporated Communication in a heterogeneous network with carrier aggregation
US9706451B2 (en) 2012-11-07 2017-07-11 Qualcomm Incorporated Method and apparatus for pre-configuring for a serving cell change to neighbor cells
WO2014074217A1 (en) * 2012-11-07 2014-05-15 Qualcomm Incorporated Method and apparatus for pre-configuring for a serving cell change to neighbor cells
WO2014090283A1 (en) * 2012-12-11 2014-06-19 Nokia Solutions And Networks Oy Liquid small cell radio link in dl for multiflow with hetnets
WO2018030943A1 (en) * 2016-08-11 2018-02-15 Telefonaktiebolaget Lm Ericsson (Publ) Methods switching frequencies of primary and secondary carriers for multi-carrier communications and related wireless devices and network nodes

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