WO2016029427A1 - Techniques de réduction du temps d'établissement d'appel à commutation de circuits (cs) durant un processus de resélection ou de redirection de cellule - Google Patents

Techniques de réduction du temps d'établissement d'appel à commutation de circuits (cs) durant un processus de resélection ou de redirection de cellule Download PDF

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Publication number
WO2016029427A1
WO2016029427A1 PCT/CN2014/085507 CN2014085507W WO2016029427A1 WO 2016029427 A1 WO2016029427 A1 WO 2016029427A1 CN 2014085507 W CN2014085507 W CN 2014085507W WO 2016029427 A1 WO2016029427 A1 WO 2016029427A1
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WIPO (PCT)
Prior art keywords
call
cell
moving
supported cell
request
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PCT/CN2014/085507
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English (en)
Inventor
Xuepan GUAN
Peng Wu
Defang Chen
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Qualcomm Incorporated
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Priority to PCT/CN2014/085507 priority Critical patent/WO2016029427A1/fr
Publication of WO2016029427A1 publication Critical patent/WO2016029427A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to reducing circuit switched (CS) call establish time during cell reselection and redirection processes.
  • CS circuit switched
  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.
  • Such networks which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN UMTS Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS) , a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • the UMTS which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband-Code Division Multiple Access (W-CDMA) , Time Division–Code Division Multiple Access (TD-CDMA) , and Time Division–Synchronous Code Division Multiple Access (TD-SCDMA) .
  • W-CDMA Wideband-Code Division Multiple Access
  • TD-CDMA Time Division–Code Division Multiple Access
  • TD-SCDMA Time Division–Synchronous Code Division Multiple Access
  • the UMTS also supports enhanced 3G data communications protocols, such as High Speed Packet Access (HSPA) , which provides higher data transfer speeds and capacity to associated UMTS networks.
  • HSPA High Speed Packet Access
  • LTE As an Internet Protocol (IP) , data transport technology using packet switching, LTE introduces challenges to satisfying established quality of service expectations for circuit switched mobile telephony and Short Message Service (SMS) for LTE-capable user equipment (UE) , while being served on the LTE network.
  • SMS Short Message Service
  • PS packet switched
  • CS circuit switched
  • CS fallback When the UE is operating in LTE, e.g. , maintaining a data connection, and a CS call comes in, the LTE network pages the UE. The UE responds with a service request message to the network, and the network signals the UE to move, i.e. , fallback, to the PS cell to accept the incoming call. Similarly, for outgoing calls, the UE may transmit the same service request message to the network and may be then signaled to move to the CS cell to start the outgoing call.
  • CS fallback CS fallback
  • the UE has to continue the redirection or reselection process to camp on the PS cell and subsequently move back to the CS cell to initiate the CS call.
  • the UE may spend a significant amount of time to establish the CS call when the call is initiated during the redirection or reselection process.
  • a method for establishing a CS call, wherein the method includes moving a CFSB UE from a CS supported cell to PS supported cell. The method also includes receiving a request to initiate the CS call during the moving and aborting the moving in response to the request to initiate the CS call. The method may further include initiating, after the move is aborted, the CS call in connection with the CS supported cell.
  • the example apparatus may include means for moving a circuit switched fall back (CSFB) user equipment (UE) from a CS supported cell to a packet switched (PS) supported cell.
  • CSFB circuit switched fall back
  • UE user equipment
  • PS packet switched
  • the example apparatus may include means for receiving a request to initiate the CS call during the moving. Further, the example apparatus may include means for aborting the moving in response to the request to initiate the CS call. Further still, the example apparatus may include means for initiating the CS call in connection with the CS supported cell.
  • the example computer readable medium may include code for moving a circuit switched fall back (CSFB) user equipment (UE) from a CS supported cell to a packet switched (PS) supported cell.
  • CSFB circuit switched fall back
  • PS packet switched
  • the example computer readable medium may include code for receiving a request to initiate the CS call during the moving. Further the example computer readable medium may include code for aborting the moving in response to the request to initiate the CS call. Further still, the example computer readable medium may include code for initiating the CS call in connection with the CS supported cell.
  • the example apparatus may include a cell manager configured to move a circuit switched fall back (CSFB) user equipment (UE) from a CS supported cell to a packet switched (PS) supported cell.
  • CSFB circuit switched fall back
  • UE user equipment
  • PS packet switched
  • the example apparatus may include a CS call controller configured to receive a request to initiate the CS call during the moving, wherein the cell manager aborts the moving in response to the request to initiate the CS call, and wherein the CS call controller initiates the CS call in connection with the CS supported cell.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • Fig. 1 is a block diagram illustrating an example wireless system in aspects of the present disclosure
  • Fig. 2 is a flow diagram illustrating aspects of a method of reducing CS call establish time as contemplated by the present disclosure
  • Fig. 3A is a call flow illustrating aspects of operations in implementing the present disclosure during cell redirection process
  • Fig. 3B is a call flow illustrating aspects of operations in implementing the present disclosure during cell reselection process
  • Fig. 4 is a block diagram illustrating aspects of a logical grouping of electrical components as contemplated by the present disclosure
  • Fig. 5 is a block diagram illustrating aspects of a computer device according to the present disclosure
  • Fig. 6 is a conceptual diagram illustrating an example of an access network
  • Fig. 7 is a block diagram conceptually illustrating an example of a Node B in communication with a UE in a telecommunications system.
  • Call establish time may refer to the time it takes to establish a call after a request to initiate a CS call is received by a UE.
  • the request to initiate a CS call may be received by the UE when the UE is being directed from a source cell that supports CS calls to a target cell that supports PS call only or when the UE is reselecting a target cell as a serving cell.
  • the UE may abort the redirection or reselection and initiate the CS call in the source cell, rather than completing the redirection or reselection process and moving back to the source cell thereafter.
  • the present methods and apparatuses may provide an efficient solution, as compared to current solutions, by aborting the redirection or reselection process.
  • system 100 includes UE 102 that may communicate with a network (NW) (not shown) via either source cell 104 or target cell 106.
  • NW network
  • source cell 104 may refer to a cell that supports CS calls
  • target cell 106 may refer to a cell that supports PS calls.
  • Non-limiting examples of source cell 104 may include cells support TD-SCDMA, W-CDMA, GSM, etc.
  • Non-limiting examples of target cell 106 may include cells support LTE.
  • the source cell 104 and the target cell 106 may be provided or supported by different network entities (e.g. , different base stations or NodeBs) . In some instances, however, the source cell 104 and the target cell 106 may be provided or supported by the same network entity.
  • UE 102 may refer to a CSFB UE that includes one or more components, some of which may be implemented as hardware, software, firmware, or any combination thereof.
  • UE 102 may include a cell manager 110 configured to move UE 102 from source cell 104 to target cell 106, or vice versa.
  • UE 102 may include a CS controller 112 configured to receive a CS call request and initiate a CS call in response to the CS call request.
  • UE 102 may typically first complete the redirection or reselection process and camp on the PS supported cell. Subsequently, UE 102 may typically move, i.e. , fall back, from the PS supported cell to a CS supported cell to initiate the CS call. As such, the UE may spend a significant amount of time to establish the CS call when the call is initiated during the redirection or reselection process.
  • cell manager 110 may further include a redirection manager 114 and a reselection manager 116.
  • Redirection manager 114 may be configured to receive an indication from the network to direct UE 102 from source cell 104 to target cell 106 and, in response to the indication, initiate a process to direct UE 102 from source cell 104 to target cell 106.
  • the network may transmit a radio resource control (RRC) connection reject/release message to UE 102 (if source cell 104 supports TDS-CDMA or W-CDMA) to redirect UE 102 to target cell 106.
  • RRC radio resource control
  • the network may transmit a channel release message to UE 102 (if source cell 104 supports GSM) to redirect UE 102 to target 106.
  • redirection manager 114 may tune a radio of UE 102 to target cell 106 utilizing a corresponding radio access technology (RAT) , e.g. , LTE.
  • RAT radio access technology
  • reselection manager 116 may be configured to reselect target cell 106 as a serving cell of UE 102. That is, reselection manager 116 may tune the radio of UE 102 to target cell 106 without receiving an indication from the network.
  • a CS call may be received during the process of redirecting UE 102 to target cell 106 or during UE 102 reselecting target cell 106 as the serving cell.
  • a CS call request may be triggered by an input from a user of UE 102 that requests an outgoing call.
  • the CS call request may be generated by the network via source cell 104, which indicates an incoming call. Either way, CS call controller 112 may receive and acknowledge the CS call request during the cell redirection process or the cell reselection process.
  • call manager 110 may be configured to abort the cell redirection process or the cell reselection process and to camp on source cell 104.
  • redirection manager 114 may terminate the redirection process and may further release resources allocated to or associated with the redirection process.
  • reselection manager 116 may terminate the reselection process to camp on source cell 104 and may release the resources allocated to or associated with the reselection process.
  • UE 102 may initiate the CS call in response to the CS call request over source cell 104.
  • the CS call establish time may be reduced.
  • method 200 may reduce the CS call establish time during cell reselection or redirection process.
  • Method 200 may operate on a UE, such as UE 102 (Fig. 1) , via execution of cell manager 110. While, for purposes of simplicity of explanation, the method is are shown and described as a series of acts, it is to be understood and appreciated that the method is not limited by the order of acts, as some acts may, in accordance with one or more aspects, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, it is to be appreciated that the method could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a step in accordance with one or more features described herein.
  • method 200 may include moving a CSFB UE from a CS supported cell to a PS supported cell.
  • cell manager 110 which includes redirection manager 114 and reselection manager 116, may be configured to move UE 102 from source cell 104 to target cell 106. That is, redirection manager 114 may be configured to receive an indication from the network to direct UE 102 from source cell 104 to target cell 106 and, in response to the indication, initiate a process to direct UE 102 from source cell 104 to target cell 106.
  • Reselection manager 116 may be configured to reselect target cell 106 as a serving cell of UE 102 and tune the radio of UE 102 to target cell 106 without receiving the above mentioned indication from the network.
  • method 200 may include receiving a request to initiate the CS call during the moving.
  • CS call controller 112 may be configured to receive and handle a CS call request when redirection manager 114 is directing UE 102 to target cell 106 or when reselection manager 116 is reselecting target cell 106 as the serving cell of UE 102.
  • UE 102 may include a receiver (see e.g. , receiver 754 in Fig. 7) , which may be configured to receive the CS call request.
  • method 200 may include aborting the moving in response to the request to initiate the CS call.
  • call manager 110 may be configured to abort the cell redirection process or the cell reselection process and to camp on source cell 104. That is, redirection manager 114 may terminate the redirection process and may further release resources allocated to or associated with the redirection process. Similarly, reselection manager 116 may terminate the reselection process to camp on source cell 104 and may release the resources allocated to or associated with the reselection process.
  • method 200 may include initiating, after the move is aborted, the CS call in connection with the CS supported cell. For example, subsequent to the termination of the cell redirection process or the cell reselection process, UE 102 may initiate the CS call in response to the CS call request over source cell 104. That is, UE 102 may respond to the incoming call or start an outgoing call in response to a user’s request.
  • a CSFB UE receives a CS call request during a cell redirection process, the CSFB will complete the cell redirection process and, subsequently, fall back to a CS supported cell to initiate a CS call. As such, the CSFB UE may spend a significant amount of time to establish the CS call when the call is initiated during the redirection process.
  • a call flow 300A is shown that illustrates a method of reducing CS call establish time during redirection process.
  • the method of Fig. 3A may operate on a UE, such as UE 102 (Fig. 1) , via execution of one or more components thereof, such as cell manager 110, redirection manager 114, and/or CS call controller 112 (Fig. 1) .
  • UE such as UE 102 (Fig. 1)
  • CS call controller 112 Fig. 1
  • the steps herein are shown and described as a series of acts, it is to be understood and appreciated that the steps are not limited by the order of acts, as some acts may, in accordance with one or more aspects, occur in different orders and/or concurrently with other acts from that shown and described herein.
  • the steps could alternatively be represented as a series of interrelated states or events, such as in a state diagram.
  • not all illustrated acts may be required to implement a step in accordance with one or more features described herein.
  • block 302 may refer to UE 102 camping on source cell 104 that supports one or more RATs including TD-SCDMA, W-CDMA, GSM, etc. Subsequently, UE 102 may receive an indication from source cell 104 to redirect (e.g. , move) UE 102 to target cell 106.
  • RATs including TD-SCDMA, W-CDMA, GSM, etc.
  • Block 304 may refer to UE 102 starting or initiating the redirection process in response to the indication. That is, redirection manager 114 may be configured to direct UE 102 from source cell 104 to target cell 106. For example, a radio resource control (RRC) connection reject/release message may be received by UE 102 (if source cell 104 supports TDS-CDMA or W-CDMA) to redirect UE 102 to target cell 106. Alternatively, a channel release message may be received by UE 102 (if source cell 104 supports GSM) to redirect UE 102 to target 106. In response to the message, redirection manager 114 may tune a radio of UE 102 to target cell 106 utilizing a corresponding radio access technology (RAT) , e.g. , LTE.
  • RAT radio access technology
  • Block 306 may refer to CS call controller 112 receiving a CS call request before the redirection process is completed, i.e. , during the redirection process.
  • a CS call may be received during the process of redirecting UE 102 to target cell 106.
  • a CS call request may be triggered by an input from a user of UE 102 that requests an outgoing call.
  • the CS call request may be generated by the network via source cell 104, which indicates an incoming call. Either way, CS call controller 112 may receive and acknowledge the CS call request during the cell redirection process.
  • Block 308 may refer to redirection manager 114 aborting the redirection process in response to the received CS call request. For example, in response to the CS call request, redirection manager 114 may terminate the redirection process and may further release resources allocated to or associated with the redirection process. As such, UE 102 may camp on source cell 104 again.
  • Block 310 may refer to UE 102 initiating the CS call in connection with the CS supported cell. For example, subsequent to the termination of the cell redirection process (e.g. , cell redirection process being aborted) , UE 102 may initiate the CS call in response to the CS call request over source cell 104. That is, UE 102 may respond to the incoming call or start an outgoing call in response to a user’s request.
  • the cell redirection process e.g. , cell redirection process being aborted
  • a CSFB UE receives a CS call request during a cell reselection process, the CSFB will complete the cell reselection process and, subsequently, fall back to a CS supported cell to initiate a CS call. As such, the CSFB UE may spend a significant amount of time to establish the CS call when the call is initiated during the reselection process.
  • a call flow 300B is shown that illustrates a method of reducing CS call establish time during reselection process.
  • the method of Fig. 3B may operate on a UE, such as UE 102 (Fig. 1) , via execution of one or more components thereof, such as cell manager 110, reselection manager 116, and/or CS call controller 112 (Fig. 1) .
  • block 312 may refer to UE 102 camping on source cell 104 that supports one or more RATs including TD-SCDMA, W-CDMA, GSM, etc. Unlike cell redirection process, UE 102 may start cell reselection process without receiving signals or indication from source cell 104.
  • Block 314 may refer to UE 102 starting or initiating the reselection process autonomously. That is, reselection manager 116 may be configured to select target cell 106 as the serving cell and may tune the radio of UE 102 to target cell 106 without receiving an indication from the network. Instead, the reselection process may take place in response to changes in operating conditions identified by UE 102.
  • Block 316 may refer to CS call controller 112 receiving a CS call request before the reselection process is completed, i.e. , during the reselection process.
  • a CS call may be received during the process of reselecting target cell 106 as the serving cell.
  • a CS call request may be triggered by an input from a user of UE 102 that requests an outgoing call.
  • the CS call request may be generated by the network via source cell 104, which indicates an incoming call. Either way, CS call controller 112 may receive and acknowledge the CS call request during the cell redirection process.
  • Block 318 may refer to reselection manager 116 aborting the reselection process in response to the received CS call request. For example, in response to the CS call request, reselection manager 116 may terminate the reselection process and may further release resources allocated to or associated with the reselection process. As such, UE 102 may camp on source cell 104 again.
  • Block 320 may refer to UE 102 initiating the CS call in connection with the CS supported cell. For example, subsequent to the termination of the cell reselection process (e.g. , cell reselection process being aborted) , UE 102 may initiate the CS call in response to the CS call request over source cell 104. That is, UE 102 may respond to the incoming call or start an outgoing call in response to a user’s request.
  • the cell reselection process e.g. , cell reselection process being aborted
  • system 400 is displayed for reducing CS call establish time during cell redirection or reselection process.
  • system 400 can reside at least partially within a UE, for example, UE 102 (Fig. 1) and/or cell manager 110 (Fig. 1) .
  • system 400 is represented as including functional blocks, which can be functional blocks that represent functions implemented by a processor, software, or combination thereof (for example, firmware) .
  • System 400 includes a logical grouping 402 of electrical components that can act in conjunction.
  • logical grouping 402 may include an electrical component 404 configured to move a CSFB UE from a CS supported cell to a PS supported cell.
  • logical grouping 402 may include an electrical component 406 configured to receive a request to initiate the CS call during the moving.
  • electrical component 406 may include or may be configured to perform at least some of the functions of CS call controller 112 (Fig. 1) .
  • logical grouping 402 may include an electrical component 408 configured to abort the moving in response to the request to initiate the CS call.
  • electrical component 408 may include or may be configured to perform at least some of the functions of cell manager 110 (Fig. 1) .
  • logical grouping 402 may include an electrical component 410 configured to initiate the CS call in connection with the CS supported cell.
  • electrical component 410 may include or may be configured to perform the at least some of the functions of CS call controller 112 (Fig. 1) .
  • system 400 can include a memory 412 that retains instructions for executing functions associated with the electrical components 404, 406, 408, and 410 stores data used or obtained by the electrical components 404, 406, 408, and 410. While shown as being external to memory 412, it is to be understood that one or more of the electrical components 404, 406, 408, and 410 can exist within memory 412.
  • electrical components 404, 406, 408, and 410 can comprise at least one processor, or each electrical component 404, 406, 408, and 410 can be a corresponding module of at least one processor.
  • electrical components 404, 406, 408, and 410 can be a computer program product including a computer readable medium, where each electrical component 4404, 406, 408, and 410 can be corresponding code.
  • cell manager 110 and/or CS call controller 112 may be represented by a specially programmed or configured UE 102.
  • UE 102 may include cell manager 110 and/or CS call controller 112 and its components, such as in specially programmed computer readable instructions or code, firmware, hardware, or some combination thereof.
  • UE 102 may include a receiver and a transmitter to communicate with, for example, a network.
  • UE 102 includes a processor 502 for carrying out processing functions associated with one or more of components and functions described herein.
  • Processor 502 can include a single or multiple set of processors or multi-core processors.
  • processor 502 can be implemented as an integrated processing system and/or a distributed processing system.
  • cell manager 110 and/or CS call controller 112 may be implemented or executed using one or any combination of processor 502, memory 504, communications component 506, and/or data store 508.
  • cell manager 110 and/or CS call controller 112 may be defined or otherwise programmed as one or more processor modules of processor 502.
  • cell manager 110 and/or CS call controller 112 may be defined as a computer-readable medium stored in memory 504 and/or data store 508 and executed by processor 502.
  • inputs and outputs relating to operations of cell manager 110 and/or CS call controller 112 may be provided or supported by communications component 506, which may provide a bus between the components of UE 102 or an interface to communication with external devices or components.
  • UE 102 further includes a memory 504, such as for storing data used herein and/or local versions of applications being executed by processor 502.
  • Memory 504 can include any type of memory usable by a computer, such as random access memory (RAM) , read only memory (ROM) , tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof.
  • UE 102 includes a communications component 506 that provides for establishing and maintaining communications with one or more parties utilizing hardware, software, and services as described herein.
  • Communications component 506 may carry communications between components on UE 102, as well as between UE 102 and external devices, such as devices located across a communications network and/or devices serially or locally connected to UE 102.
  • communications component 506 may include one or more buses, and may further include transmit chain components and receive chain components associated with a transmitter and receiver, respectively, or a transceiver, operable for interfacing with external devices.
  • communications component 506 may be configured to receive one or more pages from one or more subscriber networks. In a further aspect, such a page may correspond to the second subscription and may be received via the first technology type communication services.
  • UE 102 may further include a data store 508, which can be any suitable combination of hardware and/or software, that provides for mass storage of information, databases, and programs employed in connection with aspects described herein.
  • data store 508 may be a data repository for applications not currently being executed by processor 502 and/or any threshold values or finger position values.
  • UE 102 may additionally include a user interface component 510 operable to receive inputs from a user of UE 102 and further operable to generate outputs for presentation to the user.
  • user interface component 510 may be used by a user to provide a CS call request to UE 102.
  • User interface component 510 may include one or more input devices, including but not limited to a keyboard, a number pad, a mouse, a touch-sensitive display, a navigation key, a function key, a microphone, a voice recognition component, any other mechanism capable of receiving an input from a user, or any combination thereof.
  • user interface component 510 may include one or more output devices, including but not limited to a display, a speaker, a haptic feedback mechanism, a printer, any other mechanism capable of presenting an output to a user, or any combination thereof.
  • an access network 600 in a UTRAN architecture may include one or more UEs.
  • the multiple access wireless communication system includes multiple cellular regions (cells) , including cells 602, 604, and 606, each of which may include one or more sectors and which may be source cell 104 and/or target cell 106 of Fig. 1.
  • the multiple sectors can be formed by groups of antennas with each antenna responsible for communication with UEs in a portion of the cell. For example, in cell 602, antenna groups 612, 614, and 616 may each correspond to a different sector. In cell 604, antenna groups 618, 620, and 622 each correspond to a different sector. In cell 606, antenna groups 624, 626, and 628 each correspond to a different sector.
  • the cells 602, 604 and 606 may include several wireless communication devices, e.g. , User Equipment or UEs, for example, including UE 102 of Fig. 1 having the cell manager 110 and CS call controller 112, which may be in communication with one or more sectors of each cell 602, 604 or 606.
  • UEs 630 and 632 may be in communication with NodeB 642
  • UEs 634 and 636 may be in communication with NodeB 644
  • UEs 636 and 640 can be in communication with NodeB 646.
  • each NodeB 642, 644, 646 is configured to provide an access point for all the UEs 630, 632, 634, 636, 638, 640 in the respective cells 602, 604, and 606.
  • each NodeB 642, 644, 646 may be source cell 104 and/or target cell 106 of Fig. 1, and/or each UE 630, 632, 634, 636, 638, 640 may be UE 102 of Fig. 1, and may perform the methods outlined herein.
  • the modulation and multiple access scheme employed by the access network 600 may vary depending on the particular telecommunications standard being deployed.
  • the standard may include Evolution-Data Optimized (EV-DO) or Ultra Mobile Broadband (UMB) .
  • EV-DO and UMB are air interface standards promulgated by the 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family of standards and employs CDMA to provide broadband Internet access to mobile stations.
  • 3GPP2 3rd Generation Partnership Project 2
  • the standard may alternately be Universal Terrestrial Radio Access (UTRA) employing Wideband-CDMA (W-CDMA) and other variants of CDMA, such as TD-SCDMA; Global System for Mobile Communications (GSM) employing TDMA; and Evolved UTRA (E-UTRA) , Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, and Flash-OFDM employing OFDMA.
  • UTRA, E-UTRA, UMTS, LTE, LTE Advanced, and GSM are described in documents from the 3GPP organization.
  • CDMA2000 and UMB are described in documents from the 3GPP2 organization.
  • the actual wireless communication standard and the multiple access technology employed will depend on the specific application and the overall design constraints imposed on the system.
  • Fig. 7 is a block diagram of a NodeB 710 in communication with UE 750, where the NodeB 710 may be part of the source cell 104 and/or target cell 106 and where UE 750 may be UE 102 (Fig 1) having the cell manager 110 and CS call controller 112.
  • a transmit processor 720 may receive data from a data source 712 and control signals from a controller/processor 740. The transmit processor 720 provides various signal processing functions for the data and control signals, as well as reference signals (e.g. , pilot signals) .
  • the transmit processor 720 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC) , mapping to signal constellations based on various modulation schemes (e.g. , binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) , and the like) , spreading with orthogonal variable spreading factors (OVSF) , and multiplying with scrambling codes to produce a series of symbols.
  • CRC cyclic redundancy check
  • Channel estimates from a channel processor 744 may be used by a controller/processor 740 to determine the coding, modulation, spreading, and/or scrambling schemes for the transmit processor 720. These channel estimates may be derived from a reference signal transmitted by the UE 750 or from feedback from the UE 750.
  • the symbols generated by the transmit processor 720 are provided to a transmit frame processor 730 to create a frame structure.
  • the transmit frame processor 730 creates this frame structure by multiplexing the symbols with information from the controller/processor 740, resulting in a series of frames.
  • the frames are then provided to a transmitter 732, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through antenna 734.
  • the antenna 734 may include one or more antennas, for example, including beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 754 receives the downlink transmission through an antenna 752 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 754 is provided to a receive frame processor 760, which parses each frame, and provides information from the frames to a channel processor 784 and the data, control, and reference signals to a receive processor 770.
  • the receive processor 770 then performs the inverse of the processing performed by the transmit processor 720 in the NodeB 710. More specifically, the receive processor 770 descrambles and de-spreads the symbols, and then determines the most likely signal constellation points transmitted by the NodeB 710 based on the modulation scheme. These soft decisions may be based on channel estimates computed by the channel processor 784.
  • the soft decisions are then decoded and de-interleaved to recover the data, control, and reference signals.
  • the CRC codes are then checked to determine whether the frames were successfully decoded.
  • the data carried by the successfully decoded frames will then be provided to a data sink 772, which represents applications running in the UE 750 and/or various user interfaces (e.g. , display) .
  • Control signals carried by successfully decoded frames will be provided to a controller/processor 780.
  • the controller/processor 780 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a transmit processor 779 In the uplink, data from a data source 778 and control signals from the controller/processor 780 are provided to a transmit processor 779.
  • the data source 778 may represent applications running in the UE 750 and various user interfaces (e.g. , keyboard) .
  • the transmit processor 779 Similar to the functionality described in connection with the downlink transmission by the NodeB 710, the transmit processor 779 provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols.
  • Channel estimates may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes.
  • the symbols produced by the transmit processor 779 will be provided to a transmit frame processor 782 to create a frame structure.
  • the transmit frame processor 782 creates this frame structure by multiplexing the symbols with information from the controller/processor 780, resulting in a series of frames.
  • the frames are then provided to a transmitter 756, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the antenna 752.
  • the uplink transmission is processed at the NodeB 710 in a manner similar to that described in connection with the receiver function at the UE 750.
  • a receiver 735 receives the uplink transmission through the antenna 734 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 735 is provided to a receive frame processor 736, which parses each frame, and provides information from the frames to the channel processor 744 and the data, control, and reference signals to a receive processor 737.
  • the receive processor 737 performs the inverse of the processing performed by the transmit processor 779 in the UE 750.
  • the data and control signals carried by the successfully decoded frames may then be provided to a data sink 738 and the controller/processor, respectively. If some of the frames were unsuccessfully decoded by the receive processor, the controller/processor 780 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • the controller/processors 740 and 780 may be used to direct the operation at the NodeB 710 and the UE 750, respectively.
  • the controller/processors 740 and 780 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the computer readable media of memories 742 and 762 may store data and software for the NodeB 710 and the UE 750, respectively.
  • a scheduler/processor 746 at the NodeB 710 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.
  • TD-SCDMA High Speed Downlink Packet Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • HSPA+ High Speed Packet Access Plus
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • EV-DO Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Ultra-Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors include microprocessors, microcontrollers, digital signal processors (DSPs) , field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • DSPs digital signal processors
  • FPGAs field programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • One or more processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc. , whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • the computer-readable medium may be a non-transitory computer-readable medium.
  • a non-transitory computer-readable medium includes, by way of example, a magnetic storage device (e.g. , hard disk, floppy disk, magnetic strip) , an optical disk (e.g.
  • compact disk CD
  • digital versatile disk DVD
  • smart card a flash memory device (e.g. , card, stick, key drive) , random access memory (RAM) , read only memory (ROM) , programmable ROM (PROM) , erasable PROM (EPROM) , electrically erasable PROM (EEPROM) , aregister, a removable disk, and any other suitable medium for storing software and/or instructions that may be accessed and read by a computer.
  • RAM random access memory
  • ROM read only memory
  • PROM programmable ROM
  • EPROM erasable PROM
  • EEPROM electrically erasable PROM
  • the computer-readable medium may also include, by way of example, a carrier wave, a transmission line, and any other suitable medium for transmitting software and/or instructions that may be accessed and read by a computer.
  • the computer-readable medium may be resident in the processing system, external to the processing system, or distributed across multiple entities including the processing system.
  • the computer-readable medium may be embodied in a computer-program product.
  • a computer-program product may include a computer-readable medium in packaging materials.
  • “at least one of: a, b, or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c.
  • All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims.
  • nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U. S. C. ⁇ 112, sixth paragraph, unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for. ”

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

Abstract

La présente invention concerne un procédé et un appareil pour réduire le temps d'établissement d'appel à commutation de circuits (CS) durant un processus de redirection ou de resélection de cellule. Par exemple, le procédé peut consister à déplacer un équipement utilisateur (UE) de repli à commutation de circuits (CSFB) d'une cellule prise en charge à commutation de circuits (CS) vers une cellule prise en charge à commutation de paquets (PS). En outre, le procédé peut consister à recevoir une requête pour initier l'appel CS durant le déplacement. En outre, le procédé peut consister à abandonner le déplacement en réponse à la requête pour initier l'appel CS. Encore en outre, le procédé peut consister à initier l'appel CS en liaison avec la cellule prise en charge à commutation de circuits (CF).
PCT/CN2014/085507 2014-08-29 2014-08-29 Techniques de réduction du temps d'établissement d'appel à commutation de circuits (cs) durant un processus de resélection ou de redirection de cellule WO2016029427A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/085507 WO2016029427A1 (fr) 2014-08-29 2014-08-29 Techniques de réduction du temps d'établissement d'appel à commutation de circuits (cs) durant un processus de resélection ou de redirection de cellule

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PCT/CN2014/085507 WO2016029427A1 (fr) 2014-08-29 2014-08-29 Techniques de réduction du temps d'établissement d'appel à commutation de circuits (cs) durant un processus de resélection ou de redirection de cellule

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102238676A (zh) * 2010-04-30 2011-11-09 华为技术有限公司 电路交换域到分组交换域的切换方法和设备及通信系统
CN102404709A (zh) * 2010-09-07 2012-04-04 中国移动通信集团河南有限公司 物联网终端接入网络的系统、方法和相关装置
US20140003364A1 (en) * 2012-06-29 2014-01-02 Qualcomm Incorporated Method and apparatus for improving call setup performance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102238676A (zh) * 2010-04-30 2011-11-09 华为技术有限公司 电路交换域到分组交换域的切换方法和设备及通信系统
CN102404709A (zh) * 2010-09-07 2012-04-04 中国移动通信集团河南有限公司 物联网终端接入网络的系统、方法和相关装置
US20140003364A1 (en) * 2012-06-29 2014-01-02 Qualcomm Incorporated Method and apparatus for improving call setup performance

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