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WO2013019288A1 - Procédé destiné à améliorer le déroulement d'une redirection aveugle - Google Patents

Procédé destiné à améliorer le déroulement d'une redirection aveugle Download PDF

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Publication number
WO2013019288A1
WO2013019288A1 PCT/US2012/032201 US2012032201W WO2013019288A1 WO 2013019288 A1 WO2013019288 A1 WO 2013019288A1 US 2012032201 W US2012032201 W US 2012032201W WO 2013019288 A1 WO2013019288 A1 WO 2013019288A1
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WO
WIPO (PCT)
Prior art keywords
rats
rat
target
redirection
instruction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2012/032201
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English (en)
Inventor
Ming Yang
Tom Chin
Guangming Shi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm 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 Qualcomm Inc filed Critical Qualcomm Inc
Priority to TW101127757A priority Critical patent/TW201320785A/zh
Publication of WO2013019288A1 publication Critical patent/WO2013019288A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to blind redirection in mobile devices capable of communication on multiple networks, particularly TDD-LTE networks and UMTS networks.
  • 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
  • the UTRAN is the radio access technology or 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 (3 GPP).
  • UMTS Universal Mobile Telecommunications System
  • GPP 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
  • China is pursuing TD-SCDMA as the underlying air interface in the UTRAN architecture with its existing GSM infrastructure as the core network.
  • 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 is a collection of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), that extends and improves the performance of existing wideband protocols.
  • HSPA High Speed Packet Access
  • HSDPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Packet Access
  • FIGURE 1 is a block diagram conceptually illustrating an example of a telecommunications system.
  • FIGURE 2 is a block diagram conceptually illustrating an example of a downlink frame structure in a telecommunications system.
  • FIGURE 3 is a block diagram conceptually illustrating an example frame structure in uplink communications.
  • FIGURE 4 is a diagram conceptually illustrating an example of a base station/eNodeB and a UE in a telecommunications system.
  • FIGURE 5 is a diagram illustrating a mixed network that includes coverage areas of a TD-SCDMA network and a TDD-LTE network.
  • FIGURE 6 is a call flow diagram illustrating redirection to a target RAT, where only one RAT is included in the redirection information.
  • FIGURE 7 is a call flow diagram illustrating redirection where multiple RATs are included in the redirection information.
  • FIGURES 8A-8D are block diagrams illustrating redirection to a target RAT where multiple RATs are included in the redirection information.
  • FIGURES 9 and 10 are block diagrams illustrating components for blind redirection according to one aspect of the present disclosure.
  • a method of wireless communication includes receiving an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information that indicates a set of target RATs.
  • the method also includes receiving, from the serving RAT, a separate timer value for each of the target RATs.
  • the timer values indicate how long a UE should attempt to camp on each of the target RATs.
  • Another aspect discloses a method that includes receiving an instruction to redirect to a target RAT (radio access technology) from a serving RAT where the instruction includes redirection information indicating a set of target RATs. A redirection priority level for each of the target RATs is received from the serving RAT.
  • a target RAT radio access technology
  • Another aspect discloses a method that includes sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • a separate timer value is sent to the UE for each of the RATs.
  • the timer values indicate how long the UE should attempt to camp on each of the RATs.
  • Another aspect discloses a method that includes sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • a redirection priority level is sent to the UE for each of the RATs.
  • an apparatus for wireless communication having a memory and at least one processor coupled to the memory.
  • the processor(s) is configured to receive an instruction, from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the processor(s) is also configured to receive, from the serving RAT, a separate timer value for each of the target RATs.
  • the timer values indicate how long a UE should attempt to camp on each of the target RATs.
  • Another aspect discloses an apparatus having a memory and at least one processor coupled to the memory.
  • the processor(s) is configured to receive an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the processor(s) is also configured to receive, from the serving RAT, a redirection priority level for each of the target RATs.
  • RAT radio access technology
  • Another aspect discloses an apparatus having a memory and at least one processor coupled to the memory.
  • the processor(s) is configured to send an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the processor(s) is also configured to send a separate timer value to the UE for each of the RATs.
  • the timer values indicate how long the UE should attempt to camp on each of the RATs.
  • Another aspect discloses an apparatus having a memory and at least one processor coupled to the memory.
  • the processor(s) is configured to send an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the processor(s) is also configured to send a redirection priority level to the UE for each of the RATs.
  • a computer program product for wireless communication in a wireless network having a non-transitory computer-readable medium has non-transitory program code recorded thereon which, when executed by the processor(s), causes the processor(s) to perform operations of receiving an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the program code also causes the processor(s) to receive, from the serving RAT, a separate timer value for each of the target RATs.
  • the timer values indicate how long a UE should attempt to camp on each of the target RATs.
  • Another aspect discloses a computer program product for wireless
  • the computer readable medium has non-transitory program code recorded thereon which, when executed by the processor(s), causes the processor(s) to perform operations of sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • a separate timer value is sent to the UE for each of the RATs. The timer values indicate how long the UE should attempt to camp on each of the RATs.
  • Another aspect discloses a computer program product for wireless
  • the computer readable medium has non-transitory program code recorded thereon which, when executed by the processor(s), causes the processor(s) to perform operations of receiving an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the program code also causes the processor(s) to receive, from the serving RAT, a redirection priority level for each of the target RATs.
  • the computer readable medium has non-transitory program code recorded thereon which, when executed by the processor(s), causes the processor(s) to perform operations of sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the program code also causes the processor(s) to send a separate timer value to the UE for each of the RATs, the timer values indicating how long the UE should attempt to camp on each of the RATs.
  • Another aspect discloses a computer program product for wireless
  • the computer readable medium has non-transitory program code recorded thereon which, when executed by the processor(s), causes the processor(s) to perform operations of sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the program code also causes the processor(s) to send a redirection priority level to the UE for each of the RATs.
  • an apparatus for wireless communication includes means for receiving an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the apparatus also includes means for receiving, from the serving RAT, a separate timer value for each of the target RATs. The timer values indicate how long a UE should attempt to camp on each of the target RATs.
  • RAT radio access technology
  • Another aspect discloses an apparatus for wireless communication and includes means for receiving an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating a set of target RATs.
  • the apparatus also includes means for receiving, from the serving RAT, a redirection priority level for each of the target RATs.
  • RAT radio access technology
  • Another aspect discloses an apparatus for wireless communication and includes means for sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the apparatus also includes means for sending a separate timer value to the UE for each of the RATs. The timer values indicate how long the UE should attempt to camp on each of the RATs.
  • Another aspect discloses an apparatus for wireless communication and includes means for sending an instruction to a UE to redirect to another RAT (radio access technology).
  • the instruction includes redirection information indicting a set of RATs.
  • the apparatus also includes means for sending a redirection priority level to the UE for each of the RATs.
  • the wireless network 100 includes a number of base stations (e.g., evolved node Bs (eNodeBs)) 110 and other network entities.
  • An eNodeB may be a station that communicates with the UEs and may also be referred to as a base station, a node B, an access point, and the like.
  • Each eNodeB 110 may provide communication coverage for a particular geographic area.
  • the term "cell" can refer to this particular geographic coverage area of an eNodeB and/or an eNodeB subsystem serving the coverage area, depending on the context in which the term is used.
  • An eNodeB may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a pico cell would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like).
  • An eNodeB for a macro cell may be referred to as a macro eNodeB.
  • An eNodeB for a pico cell may be referred to as a pico eNodeB.
  • an eNodeB for a femto cell may be referred to as a femto eNodeB or a home eNodeB.
  • the eNodeBs 110a, 110b and 110c are macro eNodeBs for the macro cells 102a, 102b and 102c, respectively.
  • the eNodeB 1 lOx is a pico eNodeB for a pico cell 102x.
  • the eNodeBs HOy and l lOz are femto eNodeBs for the femto cells 102y and 102z, respectively.
  • An eNodeB may support one or multiple (e.g., two, three, four, and the like) cells.
  • the wireless network 100 may also include relay stations.
  • a relay station is a station that receives a transmission of data and/or other information from an upstream station (e.g., an eNodeB, UE, etc.) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE or an eNodeB).
  • a relay station may also be a UE that relays transmissions for other UEs.
  • a relay station HOr may communicate with the eNodeB 110a and a UE 120r in order to facilitate communication between the eNodeB 110a and the UE 120r.
  • a relay station may also be referred to as a relay eNodeB, a relay, etc.
  • the wireless network 100 may be a heterogeneous network that includes eNodeBs of different types, e.g., macro eNodeBs, pico eNodeBs, femto eNodeBs, relays, etc. These different types of eNodeBs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless network 100. For example, macro eNodeBs may have a high transmit power level (e.g., 20 Watts) whereas pico eNodeBs, femto eNodeBs and relays may have a lower transmit power level (e.g., 1 Watt).
  • macro eNodeBs may have a high transmit power level (e.g., 20 Watts)
  • pico eNodeBs, femto eNodeBs and relays may have a lower transmit power level (e.g., 1 Watt).
  • a network controller 130 may couple to a set of eNodeBs 110 and provide coordination and control for these eNodeBs 110.
  • the network controller 130 may communicate with the eNodeBs 110 via a backhaul.
  • the eNodeBs 110 may also communicate with one another, e.g., directly or indirectly via a wireless backhaul or a wireline backhaul.
  • the UEs 120 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • a UE may be able to communicate with macro eNodeBs, pico eNodeBs, femto eNodeBs, relays, and the like.
  • a solid line with double arrows indicates desired transmissions between a UE and a serving eNodeB, which is an eNodeB designated to serve the UE on the downlink and/or uplink.
  • a dashed line with double arrows indicates interfering transmissions between a UE and an eNodeB.
  • LTE utilizes orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, or the like.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • FIGURE 2 shows a downlink FDD frame structure used in LTE.
  • the transmission timeline for the downlink may be partitioned into units of radio frames.
  • Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into 10 subframes with indices of 0 through 9.
  • Each subframe may include two slots.
  • Each radio frame may thus include 20 slots with indices of 0 through 19.
  • Each slot may include L symbol periods, e.g., 7 symbol periods for a normal cyclic prefix (as shown in FIGURE 2) or 6 symbol periods for an extended cyclic prefix.
  • the 2L symbol periods in each subframe may be assigned indices of 0 through 2L-1.
  • the available time frequency resources may be partitioned into resource blocks.
  • Each resource block may cover N subcarriers (e.g., 12 subcarriers) in one slot.
  • an eNodeB may send a primary synchronization signal (PSC or PSS) and a secondary synchronization signal (SSC or SSS) for each cell in the eNodeB.
  • PSC primary synchronization signal
  • SSC secondary synchronization signal
  • the primary and secondary synchronization signals may be sent in symbol periods 6 and 5, respectively, in each of subframes 0 and 5 of each radio frame with the normal cyclic prefix, as shown in FIGURE 2.
  • the synchronization signals may be used by UEs for cell detection and acquisition.
  • the eNodeB may send a Physical Broadcast Channel (PBCH) in symbol periods 0 to 3 in slot 1 of subframe 0.
  • PBCH Physical Broadcast Channel
  • the eNodeB may send a Physical Control Format Indicator Channel (PCFICH) in the first symbol period of each subframe, as seen in FIGURE 2.
  • the eNodeB may send a Physical HARQ Indicator Channel (PHICH) and a Physical Downlink Control Channel (PDCCH) in the first M symbol periods of each subframe.
  • the PDCCH and PHICH are also included in the first three symbol periods in the example shown in FIGURE 2.
  • the PHICH may carry
  • the PDCCH may carry information on uplink and downlink resource allocation for UEs and power control information for uplink channels.
  • the eNodeB may send a Physical Downlink Shared Channel (PDSCH) in the remaining symbol periods of each subframe.
  • the PDSCH may carry data for UEs scheduled for data transmission on the downlink.
  • the eNodeB may send the PSC, SSC and PBCH in the center 1.08 MHz of the system bandwidth used by the eNodeB.
  • the eNodeB may send the PCFICH and PHICH across the entire system bandwidth in each symbol period in which these channels are sent.
  • the eNodeB may send the PDCCH to groups of UEs in certain portions of the system bandwidth.
  • the eNodeB may send the PDSCH to groups of UEs in specific portions of the system bandwidth.
  • the eNodeB may send the PSC, SSC, PBCH, PCFICH and PHICH in a broadcast manner to all UEs, may send the PDCCH in a unicast manner to specific UEs, and may also send the PDSCH in a unicast manner to specific UEs.
  • a number of resource elements may be available in each symbol period.
  • Each resource element may cover one subcarrier in one symbol period and may be used to send one modulation symbol, which may be a real or complex value.
  • the resource elements not used for a reference signal in each symbol period may be arranged into resource element groups (REGs).
  • Each REG may include four resource elements in one symbol period.
  • a UE may be within the coverage of multiple eNodeBs.
  • One of these eNodeBs may be selected to serve the UE.
  • the serving eNodeB may be selected based on various criteria such as received power, path loss, signal-to-noise ratio (SNR), etc.
  • FIGURE 3 is a block diagram conceptually illustrating an exemplary FDD and TDD (non-special subframe only) subframe structure in uplink long term evolution (LTE) communications.
  • the available resource blocks (RBs) for the uplink may be partitioned into a data section and a control section.
  • the control section may be formed at the two edges of the system bandwidth and may have a configurable size.
  • the resource blocks in the control section may be assigned to UEs for transmission of control information.
  • the data section may include all resource blocks not included in the control section.
  • the design in FIGURE 3 results in the data section including contiguous subcarriers, which may allow a single UE to be assigned all of the contiguous subcarriers in the data section.
  • a UE may be assigned resource blocks in the control section to transmit control information to an eNodeB.
  • the UE may also be assigned resource blocks in the data section to transmit data to the eNode B.
  • the UE may transmit control information in a Physical Uplink Control Channel (PUCCH) on the assigned resource blocks in the control section.
  • the UE may transmit only data or both data and control information in a Physical Uplink Shared Channel (PUSCH) on the assigned resource blocks in the data section.
  • An uplink transmission may span both slots of a subframe and may hop across frequency as shown in FIGURE 3. According to one aspect, in relaxed single carrier operation, parallel channels may be transmitted on the UL resources.
  • FIGURE 4 shows a block diagram of a design of a base station/eNodeB 110 and a UE 120, which may be one of the base stations/eNodeBs and one of the UEs in FIGURE 1.
  • the base station 110 may be the macro eNodeB 110c in FIGURE 1, and the UE 120 may be the UE 120y.
  • the base station 110 may also be a base station of some other type.
  • the base station 110 may be equipped with antennas 434a through 434t, and the UE 120 may be equipped with antennas 452a through 452r.
  • a transmit processor 420 may receive data from a data source 412 and control information from a controller/processor 440.
  • the control information may be for the PBCH, PCFICH, PHICH, PDCCH, etc.
  • the data may be for the PDSCH, etc.
  • the processor 420 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the processor 420 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 430 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 432a through 432t.
  • Each modulator 432 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.
  • Each modulator 432 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 432a through 432t may be transmitted via the antennas 434a through 434t, respectively.
  • the antennas 452a through 452r may receive the downlink signals from the base station 110 and may provide received signals to the demodulators (DEMODs) 454a through 454r, respectively.
  • Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 454 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
  • a MIMO detector 456 may obtain received symbols from all the demodulators 454a through 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 458 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 460, and provide decoded control information to a controller/processor 480.
  • a transmit processor 464 may receive and process data (e.g., for the PUSCH) from a data source 462 and control information (e.g., for the PUCCH) from the controller/processor 480. The processor 464 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466 if applicable, further processed by the modulators 454a through 454r (e.g., for SC-FDM, etc.), and transmitted to the base station 110.
  • the uplink signals from the UE 120 may be received by the antennas 434, processed by the demodulators 432, detected by a MIMO detector 436 if applicable, and further processed by a receive processor 438 to obtain decoded data and control information sent by the UE 120.
  • the processor 438 may provide the decoded data to a data sink 439 and the decoded control information to the controller/processor 440.
  • the base station 110 can send messages to other base stations, for example, over an X2 interface 441.
  • the controllers/processors 440 and 480 may direct the operation at the base station 110 and the UE 120, respectively.
  • the processor 440 and/or other processors and modules at the base station 110 may perform or direct the execution of various processes for the techniques described herein.
  • the processor 480 and/or other processors and modules at the UE 120 may also perform or direct the execution of the functional blocks illustrated in FIGURE 5 and/or other processes for the techniques described herein.
  • the memories 442 and 482 may store data and program codes for the base station 110 and the UE 120, respectively.
  • a scheduler 444 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIGURE 5 is a diagram illustrating a mixed network 50 that includes coverage areas of a 2G/3G network 500 and a TDD-LTE network 501.
  • the mixed network 50 includes areas where there is dual coverage between the 2G/3G network 500 and the TDD-LTE network 501 and other areas where there is only coverage of the individual networks.
  • the base stations 502-505 operate node Bs for the 2G/3G network 500 and eNode Bs for the TDD-LTE network 501.
  • the base station 502 may operate a single node B for the 2G/3G network 500
  • the base station 505 may operate a single eNode B for the TDD-LTE network 501.
  • the base stations 503 and 504 may each operate one node B for the 2G/3G network 500 and an eNode B for the TDD-LTE network 501.
  • UEs such as the UE 507 within the coverage area of base station 503, may connect for communication through both or either of the 2G/3G network 500 and the TDD-LTE network 501, while UEs such as the UEs 506 and 508 within the coverage areas of the base stations 502 and 505, respectively, would only be able to connect for communication through either the 2G/3G network 500 (for the UE 506 through the base station 502) or the TDD-LTE network 501 (for the UE 508 through the base station 505).
  • the UE In order for a UE, such as the UE 507, to connect to both the 2G/3G network 500 and the TDD-LTE network 501, the UE includes both hardware and software enabling it to establish communication with the protocols of both 2G/3G and TDD-LTE technologies.
  • Blind redirection may be used, for load balancing and for, circuit switched fall back (CSFB) from LTE to other radio access technologies (RATs), such as TD- SCDMA, UMTS FDD, UMTS TDD, and GSM.
  • RATs radio access technologies
  • operators may have three or more RATs deployed.
  • the initial deployment of LTE is not expected to provide an IMS (IP multimedia subsystem) voice service. Therefore, the voice service will fall back to other RATs for circuit-switched voice.
  • the 3GPP standards have supported procedures to allow the voice call to be set up when the UE is communicating with the TDD-LTE network, whether in idle or connected mode.
  • Inter- RAT redirection may be blind or non-blind. Blind redirection occurs without knowledge of the radio conditions of the other technology.
  • One advantage of blind redirection is that redirection may be executed quickly without additional measurements. However, because of the unknown coverage quality of the target cell, the redirection may fail.
  • redirection information includes only one target RAT.
  • the UE In case of failure when attempting to camp on the indicated RAT (i.e., not being able to camp on the indicated RAT within a fixed period of time), the UE will perform a full frequency scan to find an alternate RAT. It typically takes much longer for the UE to camp on other RATs that are not in the redirection information because of the time for a full frequency scan and acquisition procedures.
  • a call flow diagram illustrates processing with redirection information containing only one RAT.
  • the UE 602 is in the LTE idle mode or connected mode.
  • the UE 602 at time 612, sends an Extended Service Request so the UE can disconnect from the LTE network 606 (serving RAT).
  • the LTE network 606 sends an RRC (radio resource control) connection release message at time 614.
  • the RRC connection release message contains one target RAT in the redirection information.
  • the UE 602 tunes to the target RAT indicated in the RRC connection release message.
  • the UE performs cell selection on the target RAT.
  • An upbound timer expires at time 620 and then at 622 the UE fails to camp on the target RAT.
  • the UE 602 performs a full frequency scan to search for other RATs.
  • the UE 602 receives broadcast information from the 2G/3G network 604, such as system information blocks (SIBs) from other RATs.
  • SIBs system information blocks
  • the UE connects to a different RAT with the information collected from the full frequency scan.
  • blind redirection is configured to include multiple RATs in the redirection information from the LTE network. If the UE fails to find a suitable cell in one RAT, the UE can perform cell selection in a second RAT, third RAT, etc. based on the redirection information.
  • the supplemental redirection information reduces the time for acquiring a cell by eliminating a full frequency scan for other RATs, which are not included in redirection information. Consequently, redirection performance is improved.
  • the redirection information for each RAT may include a list of frequencies, cell IDs and broadcast system information, such as MIBs and/or SIBs (master information blocks and/or system information blocks).
  • the redirection priority level may be configured for each RAT within the redirection information.
  • the different RATs may be given different priority levels.
  • the UE first attempts to camp on the highest priority RAT, but if it fails, the UE may attempt to camp on a second priority level RAT.
  • one or more different RATs are given the same redirection priority level.
  • a separate timer may be configured for each RAT in the redirection information. This prevents a UE from spending too much time on one particular RAT. If, the UE does not camp on a first RAT with the time allocated for that RAT, the UE can quickly move to a second RAT. The network can properly set the timer value based on the number of frequencies and cells for the UE to perform cell selection for each RAT.
  • blind redirection performance is enhanced for multi RAT deployments, overcoming limitations in the current 3GPP specification.
  • the UE can identify another RAT without performing a blind full scan.
  • the UE can identify another RAT, by identifying frequencies and cell IDs, and reading broadcast system information (e.g., MIB/SIBs, etc.)
  • broadcast system information e.g., MIB/SIBs, etc.
  • the UE can quickly camp on the alternate RAT.
  • the delay of circuit switched fallback from LTE to other RATs may be decreased.
  • the UE can spend less time on one RAT before moving to other RATs, because of the proposed individual timer values.
  • FIGURE 7 illustrates a call flow of a UE performing circuit switched fall back when multiple target RAT information is included in the redirection information.
  • the UE 702 is in LTE idle/connected mode.
  • the UE sends an extended service request to the LTE network 706 (serving RAT) to prepare for the fall back.
  • a RRC connection release message is received by the UE 702.
  • Multiple target RATs are included in the redirection information received by the UE 702.
  • the UE performs cell selection on the highest priority RAT and a timer for that highest priority RAT is started.
  • the timer expires and the UE 702 stops searching for the highest priority RAT. If the UE 702 fails to find a suitable cell before the timer stops, the UE can perform cell selection in a second RAT having a second priority (where the second priority is of lower priority than highest priority RAT).
  • the second priority RAT as well as its associated timer value, are provided in the redirection information.
  • the UE performs cell selection on the second priority RAT and a second timer is started.
  • the UE 702 connects to the second priority RAT 704 without performing a full frequency scan and without collection system information. Thus, the UE 702 quickly connects to the second priority RAT 704.
  • FIGURES 8A-8D are functional block diagram illustrating example blocks executed to implement aspects of the present disclosure.
  • a user equipment receives an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating multiple target RATs.
  • the UE receives a separate timer value for each of the target RATs, where the timer values indicate the amount of time the UE should attempt to camp on each target RAT.
  • a user equipment receives an instruction from a serving radio access technology (RAT) to redirect to a target RAT.
  • the instruction includes redirection information indicating multiple target RATs.
  • the UE receives, from a serving RAT, a redirection priority level for each target RAT.
  • a serving RAT sends an instruction to a UE to redirect to another RAT.
  • the instruction includes redirection information to indicate a set of target RATs.
  • the serving RAT sends a separate timer value to the UE for each of the RATs.
  • the timer values indicate how long the UE should attempt to camp on each of the target RATs.
  • a serving RAT sends an instruction to a UE to redirect to another RAT.
  • the instruction includes redirection information to indicate a set of target RATs.
  • the serving RAT sends a redirection priority level to the UE for each of the target RATs.
  • FIGURES 9 and 10 are diagrams illustrating examples of hardware
  • the blind redirection system 914 may be implemented with a bus architecture, represented generally by a bus 924.
  • the bus 924 may include any number of interconnecting buses and bridges depending on the specific application of the blind redirection system 914 and the overall design constraints.
  • the bus 924 links together various circuits including one or more processors and/or hardware modules, represented by a processor 926, an instruction receiving module 902, a timer value receiving module 904 and a redirection priority level receiving module 906, an instruction sending module 1002, a timer value sending module 1004, a redirection priority sending module 1006, and/or a computer- readable medium 928.
  • the bus 924 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the apparatus includes the blind redirection system 914 coupled to a transceiver 922.
  • the transceiver 922 is coupled to one or more antennas 920.
  • the transceiver 922 provides a means for communicating with various other apparatus over a transmission medium.
  • the blind redirection system 914 includes the processor 926 coupled to the computer-readable medium 928.
  • the processor 926 is responsible for general processing, including the execution of software stored on the computer-readable medium 928.
  • the software when executed by the processor 926, causes the blind redirection system 914 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium 928 may also be used for storing data that is manipulated by the processor 926 when executing software.
  • the blind redirection system 914 includes the instruction receiving module 902 for receiving an instruction to redirect to a target RAT, the timer value receiving module 904 for receiving separate timer values for each target RAT and/or the redirection priority receiving module 906 for receiving redirection priority levels for each target RAT.
  • the instruction receiving module 902, the timer value receiving module 904 and the redirection priority receiving module 906 may be software modules running in the processor 926, resident/stored in the computer readable medium 928, one or more hardware modules coupled to the processor 926, or some combination thereof.
  • the blind redirection system 914 may be a component of the UE 120 and may include the memory 482 and/or the processor 480.
  • the apparatus 900 for wireless communication includes means for receiving instructions, means for receiving separate timer values and/or means for receiving redirection priority levels.
  • the means may be the instruction receiving module 902, timer value receiving module 904, redirection priority receiving module 906 and/or the blind redirection system 914 of the apparatus 900 configured to perform the functions recited by the receiving means.
  • the aforementioned means may be any module or any apparatus configured to perform the functions recited by the aforementioned means.
  • the blind redirection system 914 includes the instruction sending module 1002 for sending an instruction to redirect to a target RAT, the timer value sending module 1004 for sending separate timer values for each target RAT and/or the redirection priority sending module 1006 for sending redirection priority levels for each target RAT.
  • the instruction sending module 1002, the timer value sending module 1004 and the redirection priority sending module 1006 may be software modules running in the processor 926, resident/stored in the computer readable medium 928, one or more hardware modules coupled to the processor 926, or some combination thereof.
  • the blind redirection system 914 may be a component of the base station 110 and may include the memory 442 and/or the controller/processor 440.
  • the apparatus 900 for wireless communication includes means for sending instructions, means for sending separate timer values and/or means for sending redirection priority levels.
  • the means may be the instruction sending module 1002, timer value sending module 1004, redirection priority sending module 1006 and/or the blind redirection system 914 of the apparatus 900 configured to perform the functions recited by the receiving means.
  • the aforementioned means may be any module or any apparatus configured to perform the functions recited by the aforementioned means.
  • LTE Long Term Evolution
  • LTE-A LTE- Advanced
  • CDMA2000 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 have been described in connection with various apparatuses and methods. These processors may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software will depend upon the particular application and overall design constraints imposed on the system.
  • a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, microcontroller, digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable processing components configured to perform the various functions described throughout this disclosure.
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • PLD programmable logic device
  • the functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with software being executed by a microprocessor, microcontroller, DSP, or other suitable platform.
  • 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.
  • a computer-readable medium may include, by way of example, memory such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disc (CD), digital versatile disc (DVD)), a 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), a register, or a removable disk.
  • memory is shown separate from the processors in the various aspects presented throughout this disclosure, the memory may be internal to the processors (e.g., cache or register).
  • Computer-readable media 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.
  • At least one of a, b, and c has an identical meaning.
  • At least a, b, or c also has the same meaning.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

Un procédé de communication sans fil comprend la réception d'une instruction provenant d'une technologie d'accès radio (RAT) en service et portant sur la redirection vers une RAT cible. Ladite instruction comprend des informations de redirection indiquant une série de RAT cibles. Des valeurs de compteur distinctes peuvent être reçues en provenance de la RAT en service pour chacune des RAT cibles, ces valeurs de compteur indiquant pendant combien de temps un UE doit tenter de rester associé à chacune des RAT cibles. Un niveau de priorité de redirection est également reçu.
PCT/US2012/032201 2011-08-01 2012-04-04 Procédé destiné à améliorer le déroulement d'une redirection aveugle Ceased WO2013019288A1 (fr)

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WO2016179174A1 (fr) * 2015-05-06 2016-11-10 Qualcomm Incorporated Amélioration de la latence de repli vers commutation de circuits en réglant une temporisation d'abandon de lecture de blocs d'information de système (sib) d'après une qualité de signal
WO2016182662A1 (fr) * 2015-05-11 2016-11-17 Qualcomm Incorporated Gestion d'échec de redirection dans un réseau sans fil
US20160366622A1 (en) * 2015-06-12 2016-12-15 Qualcomm Incorporated Cell selection method for circuit-switched fallback calls
CN107925917A (zh) * 2015-08-20 2018-04-17 日本电气株式会社 通信系统、基站装置、控制装置和通信方法
US20230164660A1 (en) * 2021-11-24 2023-05-25 Mediatek Inc. Machine-Learning Assisted Environment Detection Framework For Self-Adapting Inter-RAT Steering Strategy
EP4255024A4 (fr) * 2021-01-20 2024-06-19 Vivo Mobile Communication Co., Ltd. Procédé et appareil pour traiter une défaillance de redirection, dispositif électronique et support de stockage lisible

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US10070347B2 (en) 2013-02-26 2018-09-04 Samsung Electronics Co., Ltd. Method and system for improving circuit switched fall back (CSFB) performance
KR20150128756A (ko) * 2013-02-26 2015-11-18 삼성전자주식회사 회로 교환 폴백(csfb) 성능을 개선하는 방법 및 시스템
EP2962492A4 (fr) * 2013-02-26 2016-08-03 Samsung Electronics Co Ltd Procédé et système d'amélioration de performance de repli sur commutation de circuits (csfb)
WO2014133313A1 (fr) 2013-02-26 2014-09-04 Samsung Electronics Co., Ltd. Procédé et système d'amélioration de performance de repli sur commutation de circuits (csfb)
KR102205265B1 (ko) * 2013-02-26 2021-01-20 삼성전자주식회사 회로 교환 폴백(csfb) 성능을 개선하는 방법 및 시스템
CN105027622B (zh) * 2013-02-26 2019-07-12 三星电子株式会社 用于改善电路交换回落csfb性能的方法和系统
WO2016025157A1 (fr) * 2014-08-12 2016-02-18 Qualcomm Incorporated Balayage de puissance pour établir un appel de repli sur commutation de circuits (csfb)
WO2016179174A1 (fr) * 2015-05-06 2016-11-10 Qualcomm Incorporated Amélioration de la latence de repli vers commutation de circuits en réglant une temporisation d'abandon de lecture de blocs d'information de système (sib) d'après une qualité de signal
WO2016182662A1 (fr) * 2015-05-11 2016-11-17 Qualcomm Incorporated Gestion d'échec de redirection dans un réseau sans fil
US9655015B2 (en) 2015-06-12 2017-05-16 Qualcomm Incorporated Cell selection method for circuit-switched fallback calls
CN107690825A (zh) * 2015-06-12 2018-02-13 高通股份有限公司 用于电路交换回退呼叫的蜂窝小区选择方法
WO2016200877A1 (fr) * 2015-06-12 2016-12-15 Qualcomm Incorporated Procédé de sélection de cellule destiné à des appels de secours par commutation de circuit
US20160366622A1 (en) * 2015-06-12 2016-12-15 Qualcomm Incorporated Cell selection method for circuit-switched fallback calls
CN107925917A (zh) * 2015-08-20 2018-04-17 日本电气株式会社 通信系统、基站装置、控制装置和通信方法
CN107925917B (zh) * 2015-08-20 2021-05-07 日本电气株式会社 通信系统、基站装置、控制装置和通信方法
EP4255024A4 (fr) * 2021-01-20 2024-06-19 Vivo Mobile Communication Co., Ltd. Procédé et appareil pour traiter une défaillance de redirection, dispositif électronique et support de stockage lisible
US20230164660A1 (en) * 2021-11-24 2023-05-25 Mediatek Inc. Machine-Learning Assisted Environment Detection Framework For Self-Adapting Inter-RAT Steering Strategy

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