WO2016191916A1 - Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio - Google Patents

Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio Download PDF

Info

Publication number
WO2016191916A1
WO2016191916A1 PCT/CN2015/080234 CN2015080234W WO2016191916A1 WO 2016191916 A1 WO2016191916 A1 WO 2016191916A1 CN 2015080234 W CN2015080234 W CN 2015080234W WO 2016191916 A1 WO2016191916 A1 WO 2016191916A1
Authority
WO
WIPO (PCT)
Prior art keywords
protocol stack
rat
network
network associated
wireless communication
Prior art date
Application number
PCT/CN2015/080234
Other languages
English (en)
Inventor
Jiming Guo
Peng Wu
Deepak KRISHNAMOORTHI
Amit MANDIL
Chintan Shirish SHAH
Reza Shahidi
Rahul Kashyap
Xiaochen Chen
Rakesh MODH
Original Assignee
Qualcomm Incorporated
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 Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2015/080234 priority Critical patent/WO2016191916A1/fr
Priority to TW105116710A priority patent/TW201701634A/zh
Publication of WO2016191916A1 publication Critical patent/WO2016191916A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • 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.
  • UMTS Universal Mobile Telecommunications System
  • UTRAN is the radio access network (RAN) defined as a part of UMTS, a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP) .
  • 3GPP 3rd Generation Partnership Project
  • 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
  • wireless communication devices may operate on networks using Long Term Evolution (LTE) standards, which enhance GSM, UMTS and/or CDMA2000 by improving support of mobile broadband Internet access.
  • LTE Long Term Evolution
  • Such improved support may be based, for example, on increased capacity and speed of wireless data networks, integration with other standards and multiple-input multiple-output (MIMO) antenna technology.
  • MIMO multiple-input multiple-output
  • wireless communication devices may include a single radio frequency (RF) resource configured with multiple receive paths, allowing the device to receive communications on more than one radio access technology.
  • RF radio frequency
  • Such devices which may be referred to as concurrent RAT (CRAT) -enabled devices, can therefore use shared RF resource and multiple receive chains to tune to and from networks implemented by different carriers (e.g., using multiple subscriber identity modules (SIMs) ) , and/or the same carrier (e.g., in a hybrid system) . Therefore, receive chain configurations may provide wireless communication devices with a variety of tune-away options, such as tuning away to a network associated with the same carrier, associated with a different carrier in the same radio access technology, associated with a different carrier in a different radio access technology, etc.
  • CRAT concurrent RAT
  • a wireless communication device that is in RRC connected mode may lose a radio connection with a network for a period of time.
  • the wireless communication device may fail to receive downlink messages from a network, including messages indicating the release of a radio link.
  • Such failure may cause a mismatch between the operational state of the wireless communication device and the corresponding state in the network. While this mismatch may be addressed using a variety of techniques, such solutions may involve inefficient use of power and/or network resources.
  • Systems, methods, and devices of various embodiments enable a wireless communication device having a radio frequency (RF) resource supporting at least a first and second radio access technology (RAT) to manage synchronization of a radio resource control (RRC) state.
  • managing synchronization of the RRC state may include operations of detecting a tune-away by the RF resource from the network associated with the first RAT to a network associated with the second RAT, determining whether a media access control (MAC) protocol layer inactivity timer running on the first protocol stack has expired, and detecting that the first protocol stack is operating in a connected discontinuous receive (CDRX) mode in response to determining that the MAC protocol layer inactivity timer has not expired.
  • MAC media access control
  • the operations may further include determining whether a new uplink or downlink resource grant is received from the network associated with the first RAT, and determining whether an operational RRC state of the first protocol stack might be different from a corresponding RRC state set in the network associated with the first RAT in response to determining that no new uplink or downlink resource grant is received from the network associated with the first RAT.
  • the operations may further include sending a scheduling request to the network associated with the first RAT in response to determining that the operational RRC state of the first protocol stack might be different from a corresponding RRC state set in the network.
  • the operations may further include selecting a page decode mode for use on the first protocol stack.
  • the RF resource may tune back to the network associated with the first RAT after a tune-away duration.
  • determining whether an operational RRC state of the first protocol stack is potentially different from a corresponding RRC state set in the network associated with the first RAT may include determining whether the tune-away duration was longer than a threshold duration. Some embodiments may further include determining whether a timing alignment (TA) timer for the first protocol stack has expired and uplink timing alignment has not been restored in response to determining that the MAC protocol layer inactivity timer has not expired.
  • TA timing alignment
  • selecting a page decode mode for use on the first protocol stack may include selecting an un-optimized page decode mode in response to determining that the TA timer for the first protocol stack has expired and uplink timing alignment has not been restored.
  • selecting a page decode mode for use on the first protocol stack may include selecting a same page decode mode that was in use prior to the tune-away by the RF resource in response to determining that the operational RRC state of the first protocol stack is not potentially different from a corresponding RRC state set in the network associated with the first RAT.
  • selecting a page decode mode for use on the first protocol stack may include selecting the page decode mode based on feedback from the network associated with the first RAT following the scheduling request in response to determining that the operational RRC state of the first protocol stack is potentially different from a corresponding RRC state set in the network.
  • selecting a page decode mode based on feedback from the network associated with the first RAT following the scheduling request may include selecting a power optimized page decode mode in response to determining that the feedback in response to the scheduling request comprises an uplink resource grant from the network associated with the first RAT prior to expiration of a scheduling request-prohibit timer, and selecting an un-optimized page decode mode in response to determining that the feedback in response to the scheduling request does not comprise an uplink resource grant from the network associated with the first RAT.
  • the first RAT may be an implementation of long term evolution (LTE) wireless communication protocols. Some embodiments may further include implementing the power optimized page decode mode upon selection. In some embodiments, implementing the power optimized page decode mode may include decoding a physical downlink control channel (PDCCH) during active periods of a CDRX cycle on the first protocol stack. In some embodiments, decoding the PDCCH may include using a cell radio network temporary identifier (C-RNTI) associated with the first protocol stack and using a paging radio network temporary identifier (P-RNTI) in a paging occasion unrelated to the first protocol stack.
  • C-RNTI cell radio network temporary identifier
  • P-RNTI paging radio network temporary identifier
  • implementing the un-optimized page decode mode upon selection may include decoding a physical downlink control channel (PDCCH) during active periods of a CDRX cycle on the first protocol stack, in which decoding the PDCCH is performed using a cell radio network temporary identifier (C-RNTI) associated with the first protocol stack, and decoding the PDCCH using a paging radio network temporary identifier (P-RNTI) during paging occasions associated with an idle discontinuous reception (IDRX) cycle of the first protocol stack.
  • PDCCH physical downlink control channel
  • C-RNTI cell radio network temporary identifier
  • P-RNTI paging radio network temporary identifier
  • implementing the un-optimized page decode mode may include determining whether the paging occasions associated with the IDRX cycle of the first protocol stack fall within inactive periods of the CDRX cycle, and performing additional wake-up and power-down processes on the RF resource while decoding the PDCCH in response to determining that the paging occasions associated with the IDRX cycle of the first protocol stack fall within inactive periods of the CDRX cycle.
  • the operations may further include triggering an RRC reestablishment procedure on the first protocol stack in which the RRC reestablishment procedure resumes operation of a signal radio bearer between the first protocol stack and the network associated with the first RAT.
  • the operations may further include transmitting a first scheduling request to the network associated with the first RAT, determining whether an uplink resource grant to the first protocol stack is received from the network associated with the first RAT, and resetting the MAC protocol layer inactivity timer and resetting a scheduling request counter in response to determining that an uplink resource grant to the first protocol stack is received from the network associated with the first RAT.
  • the operations may further incrementing the scheduling request counter, determining whether a current value of the scheduling request counter is greater than a predetermined threshold, and performing a local release of the connection with the network associated with the first RAT in which the local release allows the first protocol stack to transition into an RRC idle state.
  • the predetermined threshold may be set to a value of at least three.
  • the first protocol stack may be associated with a first subscriber identity module (SIM)
  • the second protocol stack may be associated with a second SIM
  • the networks associated with first and second RATs are independently operated.
  • the first and second protocol stacks may both be associated with an operator providing a hybrid system implementing at least the first and second RATs.
  • Various embodiments include a wireless communication device including a wireless communication device configured with at least the first and second RF receive resources, and a processor configured with processor-executable instructions to perform operations of the methods described above.
  • Various embodiments also include a non-transitory processor-readable medium on which is stored processor-executable instructions configured to cause a processor of a wireless communication device to perform operations of the methods described above.
  • Various embodiments also include a wireless communication device having means for performing functions of the methods described above.
  • FIG. 1A is a communication system block diagram of a network suitable for use with various embodiments.
  • FIG. 1B is system block diagram of an Evolved Packet System (EPS) suitable for use with various embodiments.
  • EPS Evolved Packet System
  • FIG. 2 is a block diagram illustrating a wireless communication device according to various embodiments.
  • FIG. 3 is a block diagram illustrating the user plane LTE protocol stack according to various embodiments.
  • FIGS. 4A and 4B are process flow diagrams illustrating a method for implementing radio resource control (RRC) state management in an example wireless communication device according to various embodiments.
  • RRC radio resource control
  • FIG. 5 is a process flow diagram illustrating another method for implementing RRC state management in an example wireless communication device according to various embodiments.
  • FIG. 6 is a component diagram of an example wireless device suitable for use with various embodiments.
  • FIG. 7 is a component diagram of another example wireless device suitable for use with various embodiments.
  • Wireless communication protocols may include mechanisms that enhance a network’s capability to serve a large number of devices simultaneously.
  • LTE Long Term Evolution
  • RRC radio resource control
  • an LTE network may track the RRC state of a wireless communication device by maintaining a corresponding RRC state representation.
  • RRC connected state is set in the LTE network and is reflected in the device operations, data exchange may occur over a radio bearer between the wireless communication device and the network.
  • the operational RRC state on the wireless communication device is out of synchronization with the representative RRC state in the network, the wireless communication device may be unresponsive to downlink transmissions or expect to receive signals that are never transmitted.
  • Systems, methods, and devices of various embodiments enable a multi-radio access technology (RAT) wireless communication device to perform efficient radio resource control (RRC) state synchronization following a long tune-away to another network.
  • RRC radio resource control
  • Such efficient synchronization may involve using existing signaling to determine, with a high degree of confidence, whether the operational RRC state on the wireless communication device does not match the corresponding RRC state represented in a network, and if so, to account for the mismatch by adjusting channel decoding.
  • Management of efficient synchronization may also include avoiding unnecessary power drain if it is determined, with a high level of confidence, that no mismatch exists between the RRC states.
  • management of efficient synchronization in the various embodiments may include forcing release of radio resources on the wireless communication device to avoid wasting network capacity when there is no pending or recent data traffic
  • wireless device mobile device, ” and “wireless communications device” are used interchangeably herein to refer to any one or all of cellular telephones, smart phones, personal or mobile multi-media players, personal data assistants (PDAs) , laptop computers, tablet computers, smart books, palm-top computers, wireless electronic mail receivers, multimedia Internet enabled cellular telephones, wireless gaming controllers, and similar personal electronic devices that include a programmable processor and memory and circuitry for establishing wireless communication pathways and transmitting/receiving data via wireless communication pathways.
  • PDAs personal data assistants
  • laptop computers laptop computers
  • tablet computers tablet computers
  • smart books smart books
  • palm-top computers wireless electronic mail receivers
  • multimedia Internet enabled cellular telephones wireless gaming controllers
  • wireless gaming controllers and similar personal electronic devices that include a programmable processor and memory and circuitry for establishing wireless communication pathways and transmitting/receiving data via wireless communication pathways.
  • SIM Subscriber Identity
  • SIM card Subscriber card
  • subscriber identity module may interchangeably refer to a memory that may be an integrated circuit or embedded into a removable card, and that stores an International Mobile Subscriber Identity (IMSI) , related key, and/or other information used to identify and/or authenticate a wireless device on a network and enable a communication service with the network.
  • IMSI International Mobile Subscriber Identity
  • Examples of SIMs include the Universal Subscriber Identity Module (USIM) provided for in the LTE 3GPP standard, and the Removable User Identity Module (R-UIM) provided for in the 3GPP2 standard.
  • USB Universal Subscriber Identity Module
  • R-UIM Removable User Identity Module
  • UICC Universal Integrated Circuit Card
  • SIM is also be used herein as a shorthand reference to the communication service associated with and enabled by the information stored in a particular SIM as the SIM and the communication network, as well as the services and subscriptions supported by that network, correlate to one another.
  • SIM may also be used as a shorthand reference to the protocol stack and/or modem stack and communication processes used in establishing and conducting communication services with subscriptions and networks enabled by the information stored in a particular
  • RF resource refers to the components in a communication device that send, receive, and decode radio frequency signals.
  • An RF resource typically includes a number of components coupled together that transmit RF signals that are referred to as a “transmit chain, ” and a number of components coupled together that receive and process RF signals that are referred to herein as a “receive chain” or “RF receive chain. ”
  • multi-SIM wireless communication device may interchangeably describe a wireless device that is configured with more than one SIM.
  • multi-SIM multi-standby communication device ” “MSMS wireless device, ” “dual-SIM dual standby communication device, ” and DSDS wireless device” may interchangeably describe a wireless communication device that is configured with more than one SIM and allows idle-mode operations to be performed on two networks simultaneously, as well as selective communication on one network while performing idle-mode operations on at least one other network.
  • Dual-SIM dual-standby communication devices are an example of a type of MSMS communication device.
  • the terms “network, ” “system, ” “wireless network, ” “cellular network, ” and “wireless communication network” may interchangeably refer to a portion or all of a wireless network of a carrier associated with a wireless device and/or subscription on a wireless device.
  • the techniques described herein may be used for various wireless communication networks such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal FDMA (OFDMA) , single carrier FDMA (SC-FDMA) and other networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single carrier FDMA
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support at least one radio access technology, which may operate on one or more frequency or range of frequencies.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • eNode eNode
  • the terms “concurrent RAT, ” “CRAT-enabled, ” “multi-RAT, ” and “dual receive” may interchangeably describe a wireless communication device that supports at least downlink communications with more than one RAT using a shared RF resource.
  • a CRAT-enabled wireless communication device may be configured with one or more receive chain corresponding to each of the supported RATs, which may be associated with a single SIM (i.e., in a hybrid mode wireless device) or with separate SIMs (i.e., in an MSMS wireless device) . That is, at a given time, a CRAT-enabled wireless device may be able to actively receive communications on any one of the supported RATs.
  • IDRX mode may interchangeably refer to an idle state process that involves alternating sleep periods (during which power consumption is minimized) and awake (or “wake-up” ) periods in which normal power consumption and reception are returned, and the wireless device monitors a paging channel.
  • the length of an IDRX cycle measured as the interval between the start of an awake period and the start of the next awake period, is typically signaled by the network.
  • CDRX mode may interchangeably refer to a connected state process that involves alternating between an “On duration” (CDRX-on period) in which the downlink control channel is continuously monitored for scheduling messages, and an “Off duration” (CDRX-off period) period in which reception of downlink channels may be skipped to save power, with downlink traffic buffered until the next CDRX-on period.
  • the length of a CDRX cycle measured as the interval between the start of a CDRX-on period and the start of the next CDRX-on period, may be dynamically configured based on the amount of time between data transfers.
  • Wireless communication networks are widely deployed to provide various communication services such as voice, packet data, broadcast, messaging, and so on. These wireless networks may be capable of supporting communications for multiple users by sharing the available network resources.
  • the techniques described herein may be used for various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, Single-Carrier FDMA (SC-FDMA) networks, etc.
  • technologies that may be implemented by such wireless communication networks may include Wireless networks may also utilize various radio technologies such as Wideband-CDMA (W-CDMA) , CDMA2000, Global System for Mobile Communications (GSM) , etc.
  • W-CDMA Wideband-CDMA
  • CDMA2000 including Global System for Mobile Communications
  • GSM Global System for Mobile Communications
  • a CDMA network may implement Universal Terrestrial Radio Access (UTRA) (including Wideband-CDMA (W-CDMA) standards) , CDMA2000 (including IS-2000, IS-95 and/or IS-856 standards) , etc.
  • UTRA Universal Terrestrial Radio Access
  • W-CDMA Wideband-CDMA
  • CDMA2000 including IS-2000, IS
  • a TDMA network may implement Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • an OFDMA network may implement Evolved UTRA (E-UTRA) (including Long Term Evolution (LTE) standards) , IEEE 802.11 (WiFi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash- etc.
  • E-UTRA Evolved UTRA
  • LTE Long Term Evolution
  • WiFi IEEE 802.11
  • WiMAX IEEE 802.16
  • Flash- etc Flash- etc.
  • Modern wireless communication devices may each include one or more SIM cards containing SIMs that enable a user to connect to different mobile networks while using the same mobile communication device.
  • Each SIM serves to identify and authenticate a subscriber using a particular mobile communication device, and each SIM is associated with only one subscription.
  • the term “RF resource” refers to the components in a wireless communication device that send, receive and decode radio frequency signals.
  • An RF resource typically includes a number of components coupled together that transmit RF signals that are referred to as a “transmit chain, ” and a number of components coupled together that receive and process RF signals that are referred to herein as a “receive chain. ”
  • receiver operations may be described herein with reference to a degree of two (i.e., two RATs, two SIMs, two receive chains, etc. ) , such references are used as example and are not meant to preclude embodiments capable of communications on three or more RATs and/or with three or more SIMs.
  • the terms “receiver” and/or “transmitter” may respectively indicate a receive chain and/or transmit chain, and/or portions thereof in use for radio links.
  • Such portions of the receive chain and/or transmit chain may be parts of the RF resource that include, without limitation, an RF front end, components of the RF front end (including a receiver unit and/or transmitter unit) , one or more antenna, etc.
  • Portions of a receive chain and/or transmit chain may be integrated into a single chip, or distributed over multiple chips.
  • the RF resource, or the parts of the RF resource may be integrated into a chip along with other functions of the wireless communication device.
  • the communication system 100 may include one or more wireless communication devices 102, a wireless communication network 104, and network servers 106 coupled to the wireless communication network 104 and to the Internet 108.
  • the network server 106 may be implemented as a server within the network infrastructure of the wireless communication network 104.
  • a typical wireless communication network 104 may include a plurality of cell base stations 110 coupled to a network operations center 112, which operates to connect voice and data calls between the wireless communication devices 102 (e.g., tablets, laptops, cellular phones, etc. ) and other network destinations, such as via telephone land lines (e.g., a POTS network, not shown) and the Internet 108.
  • the wireless communication network 104 may also include one or more servers 116 coupled to or within the network operations center 112 that provide a connection to the Internet 108 and/or to the network servers 106.
  • Communications between the wireless communication devices 102 and the wireless communication network 104 may be accomplished via two-way wireless communication links 114, such as GSM, UMTS, EDGE, fourth generation (4G) , 3G, CDMA, TDMA, LTE, and/or other communication technologies.
  • two-way wireless communication links 114 such as GSM, UMTS, EDGE, fourth generation (4G) , 3G, CDMA, TDMA, LTE, and/or other communication technologies.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support one or more radio access technology, which may operate on one or more frequency (also referred to as a carrier, channel, frequency channel, etc. ) in the given geographic area in order to avoid interference between wireless networks of different radio access technologies.
  • frequency also referred to as a carrier, channel, frequency channel, etc.
  • the wireless communication device 102 may search for wireless networks from which the wireless communication device 102 can receive communication service.
  • the wireless communication device 102 may be configured to prefer LTE networks when available by defining a priority list in which LTE frequencies occupy the highest spots.
  • the wireless communication device 102 may perform registration processes on one of the identified networks (referred to as the serving network) , and the wireless communication device 102 may operate in a connected mode to actively communicate with the serving network. Alternatively, the wireless communication device 102 may operate in an idle mode and camp on the serving network if active communication is not required by the wireless communication device 102.
  • the wireless communication device 102 may identify all RATs in which the wireless communication device 102 is able to find a “suitable” cell in a normal scenario or an “acceptable” cell in an emergency scenario, as specified in the LTE standards, such as 3GPP TS 36.304 version 8.2.0 Release 8, entitled “LTE; Evolved Universal Terrestrial Radio Access (E-UTRA) ; User Equipment (UE) procedures in idle mode. ”
  • LTE Long Term Evolution
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • UE User Equipment
  • the wireless communication device 102 may camp on a cell belonging to the RAT with the highest priority among all identified cells.
  • the wireless communication device 102 may remain camped on that cell until either the control channel no longer satisfies a threshold signal strength or signals from a cell of a higher priority RAT reach the threshold signal strength.
  • Such cell selection/reselection operations for the wireless communication device 102 in the idle mode are also described in 3GPP TS 36.304 version 8.2.0 Release 8.
  • FIG. 1B illustrates a network architecture 150 that includes an Evolved Packet System (EPS) .
  • EPS Evolved Packet System
  • the wireless communication device 102 may be connected to an LTE access network, for example, an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) 152.
  • the E-UTRAN 152 may be a network of LTE base stations (i.e., eNodeBs) (e.g., 110 in FIG. 1A) , which may be connected to one another via an X2 interface (e.g., backhaul) (not shown) .
  • eNodeBs LTE base stations
  • X2 interface e.g., backhaul
  • each eNodeB may provide to wireless devices an access point to an LTE core (e.g., an Evolved Packet Core) .
  • the EPS in the network architecture 150 may further include an Evolved Packet Core (EPC) 154 to which the E-UTRAN 152 may connect.
  • the EPC 154 may include at least one Mobility Management Entity (MME) 162, a Serving Gateway (SGW) 160, and a Packet Data Network (PDN) Gateway (PGW) 163.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • PGW Packet Data Network Gateway
  • the E-UTRAN 152 may connect to the EPC 154 by connecting to the SGW 160 and to the MME 162 within the EPC 154.
  • the MME 162 which may also be logically connected to SGW 160, may handle tracking and paging of the wireless communication device 102 and security for E-UTRAN access on the EPC 154.
  • the MME 162 may be linked to a Home Subscriber Server (HSS) 156, which may support a database containing user subscription, profile, and authentication information. Further, the MME 162 provides bearer and connection management for user IP packets, which are transferred through the SGW 160.
  • the SGW 160 may be connected to the PGW 163, which may provide IP address allocation to the wireless communication device 102, as well as other functions.
  • the PGW 163 may be connected to the Operator's IP Services 158, which may include, for example, the Internet, an Intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service (PSS) , etc.
  • the network architecture 150 may also include circuit-switched (CS) and packet-switched (PS) networks.
  • the wireless communication device 102 may be connected to the CS and/or PS packet switched networks by connecting to a legacy second generation (2G) /third generation (3G) access network 164.
  • the 2G/3G access network 164 may be, for example, one or more UTRAN, GSM Enhanced Data rates for Global Evolution (EDGE) Radio Access Network (GERAN) , CDMA2000 1xRTT, CDMA2000 1xEV-DO, etc.
  • the 2G/3G access network 164 may include a network of base stations (e.g., base transceiver stations (BTSs) , nodeBs, radio base stations (RBSs) , etc. ) (e.g., 110) , as well as at least one base station controller (BSC) or radio network controller (RNC) .
  • BSC base station controller
  • RNC radio network controller
  • the 2G/3G access network 164 may connect to the circuit switched network via an interface with (or gateway to) a Mobile switching center (MSC) and associated Visitor location register (VLR) , which may be implemented together as MSC/VLR 166.
  • MSC Mobile switching center
  • VLR Visitor location register
  • the MSC/VLR 166 may connect to a CS core 168, which may be connected to external networks (e.g., the public switched telephone network (PSTN) ) through a Gateway MSC (GMSC) 170.
  • PSTN public switched telephone network
  • GMSC Gateway MSC
  • the 2G/3G access network 164 may connect to the PS network via an interface with (or gateway to) a Serving GPRS support node (SGSN) 172, which may connect to a PS core 174.
  • SGSN Serving GPRS support node
  • PS core 174 may be connected to external PS networks, such as the Internet and the Operator’s IP services 158 through a Gateway GPRS support node (GGSN) 176.
  • GGSN Gateway GPRS support node
  • LTE network operators may employ various techniques to enable voice calls to the wireless communication device 102 when camped on an eNodeB of the E-UTRAN 152 (i.e., LTE network) .
  • the LTE network may co-exist in mixed (i.e., hybrid) networks with the CS and PS networks, with the MME 162 serving the wireless communication device 102 for utilizing PS data services over the LTE network, the SGSN 172 serving the wireless communication device 102 for utilizing PS data services in non-LTE areas, and the MSC/VLR 166 serving the wireless communication device 102 for utilizing voice services.
  • the wireless communication device 102 may be able to use a single RF resource for both voice and LTE data services by implementing circuit-switched fallback (CSFB) to switch between accessing the E-UTRAN 152 and the legacy 2G/3G access network 164.
  • CSFB circuit-switched fallback
  • the mixed network may be enabled to facilitate circuit switched fallback (CSFB) via an interface (SGs) between the MME 162 and the MSC/VLR 166.
  • CSFB circuit switched fallback
  • the interface enables the wireless communication device 102 to utilize a single RF resource to be both CS and PS registered while camped on the LTE network, which enables delivery CS pages via the E-UTRAN 152.
  • a CS page may initiate the CSFB procedure, which may cause the wireless device to transition to the CS network and utilize the CS call setup procedures.
  • modulation and radio access schemes may be employed by a high speed access network (e.g., a E-UTRAN) , and may vary depending on the particular telecommunications standard being deployed.
  • a high speed access network e.g., a E-UTRAN
  • OFDM orthogonal frequency-division multiplexing
  • SC-FDMA single-carrier frequency-division multiple access
  • FDD frequency division duplexing
  • TDD time division duplexing
  • the various embodiments may be extended to Evolution-Data Optimized (EV-DO) and/or Ultra Mobile Broadband (UMB) , each of which are air interface standards promulgated by the 3rd Generation Partnership Project 2 (3GPP2) as part of the CDMA2000 family to provide broadband Internet access to wireless devices.
  • EV-DO Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • the various embodiments may also be extended to UTRA employing W-CDMA) , GSM, Ultra Mobile Broadband (UMB) , IEEE 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, and/or Flash-OFDM employing OFDMA.
  • W-CDMA Wideband
  • GSM Global System for Mobile Communications
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • Flash-OFDM Flash-OFDM employing OFDMA.
  • access network entities may have multiple antennas supporting MIMO technology, thereby enabling the eNodeBs to exploit the spatial domain to support spatial multiplexing, beamforming, and/or transmit diversity.
  • Spatial multiplexing may be used to transmit different streams of data simultaneously on the same frequency.
  • the data steams may be transmitted to a single wireless device to increase the data rate, while in other instances the data streams may be transmitted to multiple wireless devices to increase the overall system capacity.
  • an eNodeB may spatially precode each data stream, and transmit each spatially precoded data stream through multiple transmit antennas on the downlink.
  • the spatially precoded data streams may arrive at the one or more wireless device with different spatial signatures, enabling recovery of the one or more data streams destined for that device or antenna.
  • each wireless device may transmit a spatially precoded data stream, which enables the eNodeB to identify the source of each received data stream.
  • beamforming may be used by the eNodeB to focus transmission energy in one or more direction.
  • beamforming may involve spatially precoding the data for transmission through multiple antennas.
  • a single stream beamforming transmission may be used in combination with transmit diversity (e.g., sending the stream to the same source through multiple antennas) .
  • LTE-Advanced wireless networks that have been deployed or that may be deployed in the future.
  • LTE-Advanced communications typically use spectrum in up to 20 MHz bandwidths allocated in a carrier aggregation of up to a total of 100 MHz (5 component carriers) used for transmission in each direction.
  • FIG. 2 is a functional block diagram of an example wireless communication device 200 that is suitable for implementing various embodiments.
  • the wireless communication device 200 may be similar to one or more of the wireless communication devices 102 as described.
  • the wireless communication device 200 may include a SIM interface 202, which may represent one or multiple SIM interfaces.
  • the SIM interface 202 may receive a first identity module SIM 204 that is associated with a first subscription.
  • the wireless communication device 200 may also include a second SIM interface as part of the SIM interface 202, which may receive a second identity module SIM 204 that is associated with a second subscription. In some embodiments, this configuration may be repeated for further SIM interfaces and/or SIMs (e.g., third, fourth, etc. ) (not shown) .
  • a SIM in various embodiments may be a Universal Integrated Circuit Card (UICC) that is configured with SIM and/or USIM applications, enabling access to GSM and/or UMTS networks.
  • the UICC may also provide storage for a phone book and other applications.
  • a SIM may be a UICC removable user identity module (R-UIM) or a CDMA subscriber identity module (CSIM) on a card.
  • R-UIM UICC removable user identity module
  • CCM CDMA subscriber identity module
  • Each SIM 204 may have a CPU, ROM, RAM, EEPROM and I/O circuits.
  • a SIM 204 used in various embodiments may contain user account information, an IMSI a set of SIM application toolkit (SAT) commands and storage space for phone book contacts.
  • a SIM 204 may further store home identifiers (e.g., a System Identification Number (SID) /Network Identification Number (NID) pair, a Home PLMN (HPLMN) code, etc. ) to indicate the SIM network operator provider.
  • An Integrated Circuit Card Identity (ICCID) SIM serial number may be printed on the SIM card for identification.
  • the wireless communication device 200 may include at least one controller, such as a general purpose processor 206, which may be coupled to a coder/decoder (CODEC) 208.
  • the CODEC 208 may in turn be coupled to a speaker 210 and a microphone 212.
  • the general purpose processor 206 may also be coupled to at least one memory 214.
  • the memory 214 may be a non-transitory tangible computer readable storage medium that stores processor-executable instructions.
  • the instructions may include routing communication data relating to the first or second subscription though a corresponding baseband-RF resource chain.
  • the memory 214 may store operating system (OS) , as well as user application software and executable instructions.
  • OS operating system
  • the general purpose processor 206 and memory 214 may each be coupled to at least one baseband-modem processor 216.
  • Each SIM 204 in the wireless communication device 200 may be associated with a baseband-RF resource chain that includes a baseband-modem processor 216 and at least one receive block (e.g., RX1, RX2) of an RF resource 218.
  • baseband-RF resource chains may include physically or logically separate baseband modem processors (e.g., BB1, BB2) .
  • the RF resource 218 may be coupled to at least one antenna 220 and may perform transmit/receive functions for the wireless services associated with the SIM (s) 204 of the wireless communication device 200.
  • the RF resource 218 may be coupled to multiple wireless antenna (s) 220 for sending and receiving RF signals for multiple versions of an RF signal, SIMs 204, thereby enabling the wireless communication device 200 to use receive diversity and/or multiple-input multiple-output (MIMO) operations.
  • the RF resource 218 may include separate receive and transmit functionalities, or may include a transceiver that combines transmitter and receiver functions.
  • the transmit functionalities of the RF resource 218 may be implemented by at least one transmit block (TX) , which may represent circuitry associated with one or more radio access technologies/SIMs
  • the general purpose processor 206, memory 214, baseband-modem processor (s) 216, and RF resource 218 may be included in a system-on-chip device 222.
  • the one or more SIM 204 and corresponding interface (s) 202 may be external to the system-on-chip device 222.
  • various input and output devices may be coupled to components of the system-on-chip device 222, such as interfaces or controllers.
  • Example user input components suitable for use in the wireless communication device 200 may include, but are not limited to, a keypad 224 and a touchscreen display 226.
  • the keypad 224, touchscreen display 226, microphone 212, or a combination thereof may perform the function of receiving the request to initiate an outgoing call.
  • the touchscreen display 226 may receive a selection of a contact from a contact list or receive a telephone number.
  • either or both of the touchscreen display 226 and microphone 212 may perform the function of receiving a request to initiate an outgoing call.
  • the touchscreen display 226 may receive selection of a contact from a contact list or to receive a telephone number.
  • the request to initiate the outgoing call may be in the form of a voice command received via the microphone 212.
  • Interfaces may be provided between the various software modules and functions in the wireless communication device 200 to enable communication between them, as is known in the art.
  • the baseband-modem processor of a wireless communication device may be configured to execute software including at least one protocol stack associated with at least one SIM.
  • SIMs and associated protocol stacks may be configured to support a variety of communication services that fulfill different user requirements. Further, a particular SIM may be provisioned with information to execute different signaling procedures for accessing a domain of the core network associated with these services and for handling data thereof.
  • a wireless communication device in the various embodiments may support a number of radio access technologies (RATs) to support communication with different wireless networks.
  • the radio technologies may include a wide area network (e.g., third generation partnership project (3GPP) long term evolution (LTE) or 1x radio transmission technology (1xRTT or 1x)) , wireless local area network (WLAN) , Bluetooth and/or the like.
  • 3GPP third generation partnership project
  • LTE long term evolution
  • 1xRTT or 1x 1x radio transmission technology
  • WLAN wireless local area network
  • Bluetooth Bluetooth and/or the like.
  • Multiple antennas and/or receive blocks may be provided to facilitate multimode communication with various combinations of antenna and receiver/transmitter configurations.
  • Each radio technology may transmit or receive signals via one or more antennas.
  • the RF resource 218 may be configured with receiver and transmitter circuitry to support multiple radio access technologies/wireless networks that operate according to different wireless communication protocols.
  • Such circuitry may allow the RF resource 218 to process signals associated with different communication standards, and may include or provide connections to different sets of amplifiers, digital to analog converters, analog to digital converters, filters, voltage controlled
  • FIG. 3 illustrates an example of a radio protocol stack for the user and control planes in LTE.
  • the wireless communication device 200 may implement software architecture 300 to communicate with an eNodeB 350 of an access network (e.g., E-UTRAN 152) associated with one or more SIM.
  • layers in software architecture 300 may form logical connections with corresponding layers in software of the eNodeB 350.
  • the software architecture 300 may be distributed among one or more processors, such as the baseband modem processor 216.
  • the software architecture 300 may include multiple protocol stacks, each of which may be associated with a different RAT, and optionally, a different SIM (e.g., two protocol stacks associated with two SIMs 204, respectively, in a DSDS wireless device) . Further, while described below with reference to LTE communication layers, the software architecture 300 may support any of variety of standards and protocols for wireless communications, and/or may include additional protocol stacks that support any of variety of standards and protocols wireless communications.
  • the software architecture 300 may include a Non Access Stratum (NAS) 302 and an Access Stratum (AS) 304.
  • the NAS 302 may include functions and protocols to support packet filtering, security management, mobility control, session management, and traffic and signaling between a SIM (s) of the wireless communication device (e.g., SIM (s) 204) and its core network.
  • the AS 304 may include functions and protocols that support communication between a SIM (s) (e.g., SIM(s) 204) and entities of supported access networks (e.g., an eNodeB) .
  • the AS 304 may include at least three layers (Layer 1, Layer 2, and Layer 3), each of which may contain various sub-layers.
  • Layer 1 (L1) of the AS 304 may be a physical layer 306, which may oversee functions that enable transmission and/or reception over the air interface.
  • Examples of such physical layer 306 functions may include cyclic redundancy check (CRC) attachment, coding blocks, scrambling and descrambling, modulation and demodulation, signal measurements, MIMO, etc.
  • CRC cyclic redundancy check
  • Layer 2 (L2) of the AS 304 may be responsible for the link between the wireless communication device 200 and the eNodeB 350 over the physical layer 306.
  • Layer 2 may include a media access control (MAC) sublayer 308, a radio link control (RLC) sublayer 310, and a packet data convergence protocol (PDCP) 312 sublayer, each of which form logical connections terminating at the eNodeB 350.
  • MAC media access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • Layer 3 (L3) of the AS 304 may include a radio resource control (RRC) sublayer 3.
  • RRC radio resource control
  • the software architecture 300 may include additional Layer 3 sublayers, as well as various upper layers above Layer 3.
  • the RRC sublayer 313 may provide functions including broadcasting system information, paging, and establishing and releasing an RRC signaling connection between the wireless communication device 200 and the access network (e.g., eNodeB of E-UTRAN 152) .
  • the PDCP sublayer 312 may provide uplink functions including multiplexing between different radio bearers and logical channels, sequence number addition, handover data handling, integrity protection, ciphering, and header compression.
  • the PDCP sublayer 312 may provide functions that include in-sequence delivery of data packets, duplicate data packet detection, integrity validation, deciphering, and header decompression.
  • the RLC sublayer 310 may provide segmentation and concatenation of upper layer data packets, retransmission of lost data packets, and Automatic Repeat Request (ARQ) .
  • ARQ Automatic Repeat Request
  • the RLC sublayer 310 functions may include reordering of data packets to compensate for out-of-order reception, reassembly of upper layer data packets, and ARQ.
  • MAC sublayer 308 may provide functions including multiplexing between logical and transport channels, random access procedure, logical channel priority, and hybrid-ARQ (HARQ) operations.
  • the MAC layer functions may include channel mapping within a cell, de-multiplexing, discontinuous reception, and HARQ operations.
  • the software architecture 300 may provide functions to transmit data through physical media
  • the software architecture 300 may further include at least one host layer 314 to provide data transfer services to various applications in the wireless communication device 200.
  • application-specific functions provided by the at least one host layer 314 may provide an interface between the software architecture and the general purpose processor 206.
  • the software architecture 300 may include one or more higher logical layers (e.g., transport, session, presentation, application, etc. ) that provide host layer functions.
  • the software architecture 300 may include a network layer (e.g., an IP layer) in which a logical connection terminates at a PDN gateway (e.g., PGW 163) .
  • the software architecture 300 may include an application layer in which a logical connection terminates at another device (e.g., end user device, server, etc. ) .
  • the software architecture 300 may further include in the AS 304 a hardware interface 316 between the physical layer 306 and the communication hardware (e.g., one or more RF transceivers) .
  • a wireless communication device may be in one of two states defined by the RRC protocol: RRC idle state, and RRC connected state.
  • RRC idle state the wireless communication device is not attached to a network (i.e., eNodeB) , and performs free cell re-selection.
  • eNodeB a network
  • RRC connected state the wireless communication device is connected to an eNodeB, which handles mobility and handovers, and is associated with signaling radio bearers and an identifier of the wireless device. While such a connection with an eNodeB may be referred to herein with respect to the wireless communication device, it will be understood that a connection is established on a modem stack associated with an IMSI (i.e., SIM) in the LTE system.
  • IMSI i.e., SIM
  • reference to the wireless communication device in various procedures and/or communications with a network may be a general reference to the user equipment associated with a subscription in the network.
  • a SIM transferred to different user equipment may be characterized as the same wireless communication device for purposes of network connections
  • RRC connection establishment and release procedures are defined in which the wireless communication device (or modem stack associated with LTE operations) switches between the RRC connected and idle states.
  • an eNodeB typically may implement an RRC inactivity timer that is started when the wireless communication device enters the RRC connected state. If the eNodeB observes that there is no data exchanged prior to expiration of the RRC inactivity timer, the eNodeB may release the radio resources involved in the RRC connection and send an RRC connection release message to the wireless device.
  • the RRC connection release message may be in the form of control signals transmitted by the eNodeB on the physical downlink control channel (PDCCH) .
  • PDCCH physical downlink control channel
  • the RRC inactivity timer may be configured by the eNodeB based on an amount of waiting time specified by the core network (e.g., EPC 154) and/or based on radio measurements and conditions observed by the eNodeB.
  • the core network e.g., EPC 154
  • the wireless communication device In the RRC idle state, the wireless communication device does not have an active communication session.
  • a core network entity e.g., MME 162 or an eNodeB may trigger a paging procedure.
  • paging messages may be, for example, a notification of downlink traffic (e.g., a mobile terminating voice call or packet data transfer) , a system information change, or earthquake and tsunami warning service (ETWS) notification to the wireless communication device.
  • EWS earthquake and tsunami warning service
  • the wireless communication device (or modem stack associated with LTE operations) device may monitor the PDCCH during a particular time frame for a paging radio network temporary identifier (P-RNTI) .
  • P-RNTI paging radio network temporary identifier
  • the P-RNTI is a single fixed indicator (FFFE) that indicates on the PDCCH that paging information being carried in the corresponding resource blocks on the physical downlink shared channel (PDSCH) .
  • the wireless communication device may save power by monitoring the PDCCH for the P-RNTI only during a particular paging occasion (i.e., sub-frame of paging frame) associated with the paging group to which the wireless communication device belongs, and powering down receive circuitry at other times.
  • paging occasions may occur periodically (e.g., once every 60 ms or 100 ms) , creating a cycle of sleep and awake states that constitute an idle state discontinuous reception (IDRX) mode.
  • the RF resource may monitor signals from neighbor cells (e.g., evaluate measurements indicative of signal quality) as well as monitor for paging messages.
  • the wireless communication device may select the paging frame and paging occasion to monitor by receiving IDRX parameters broadcast by the LTE network.
  • IDRX parameters may be part of information that is provided in a particular system information block (SIB) , such as SIB2.
  • SIB system information block
  • the wireless communication device in RRC connected state should monitor the PDCCH in every sub-frame to check whether downlink data is available. For example, the wireless communication device may decode the PDCCH using a cell radio network temporary identifier (C-RNTI) assigned by the LTE network to the particular wireless communication device (or modem stack associated with LTE operations) .
  • C-RNTI cell radio network temporary identifier
  • the wireless device may reduce such consumption by implementing a connected state DRX (CDRX) mode.
  • CDRX connected state DRX
  • the wireless communication device may exploit the short periods of time during which no data is sent or received in a data communication session (e.g., during the packet arrival process when there are no outstanding or new packets to be sent or received) .
  • the wireless communication device may cycle between periods of monitoring the PDCCH for downlink data (i.e., CDRX-on period) and periods in which the RF resource is not used and/or is powered down (i.e., CDRX-off period) .
  • the eNodeB may configure a set of CDRX parameters for the wireless communication device (or modem stack associated with LTE operations) , which may be selected based on the application type such that power and resource savings are maximized.
  • the wireless communication device may experience an extended delay in receiving data since some or all of such data may be buffered by the eNodeB to avoid arriving during the CDRX-off period. Therefore, CDRX parameters may be set to achieve a balance between minimizing packet delay maximizing power savings.
  • Paging messages may also be used to send some types of information to the wireless communication device in the RRC connected state. Specifically, similar to RRC idle state, system information changes and ETWS notifications may be provided to the wireless communication device using the paging in the RRC connected state. Since the eNodeB may not be aware of the RRC idle state devices that are camped in its coverage, the eNodeB may send such information in all possible paging occasions. Therefore, in various embodiments, the wireless communication device may implement a “power optimized page decode mode” to further improve power savings in CDRX mode. Specifically, the power optimized page decode mode provides for the wireless communication device (or modem stack associated with LTE operations) to receive paging messages by monitoring any paging occasion during or adjacent to the CDRX-on period.
  • the wireless communication device may receive the same information in a different paging occasion and avoid an unnecessary wakeup during the CDRX-off period.
  • the wireless communication device monitors one paging occasion at least once every default Paging Cycle (e.g., 1.28 s)
  • the power optimized page decode mode may comply with performance requirements set forth in 3GPP TS 36.331.
  • the eNodeB may transmit ongoing timing advance commands in order to maintain time alignment.
  • such commands may be sent periodically or as needed, as determined by the eNodeB.
  • the wireless communication device may restart a timing alignment (TA) timer, which represents the amount of time that the wireless communication device is expected to have uplink synchronization with the eNodeB using the value in the current time advance command value.
  • TA timing alignment
  • the wireless communication device may only be considered to be in uplink alignment with the eNodeB when the TA timer is running.
  • the wireless communication device may release an assigned physical uplink control channel (PUCCH) , as well as clear any configured uplink and/or downlink resource grants.
  • PUCCH physical uplink control channel
  • the wireless communication device performs a random access procedure, which may be triggered by the wireless communication device itself (e.g., for pending uplink data) or triggered by the eNodeB via a signal on the PDCCH (e.g., for pending downlink data) .
  • a wireless communication device with a single RF resource may provide concurrent RAT (CRAT) support using variety of configurations and modes.
  • the wireless communication device may be a single-radio LTE (SRLTE) device configured to access LTE for data communications and GSM or 1xRTT for voice calls (e.g., GSM/SRLTE or 1x SRLTE) .
  • the wireless communication device may be a MSMS wireless communication device, such as a DSDS wireless communication device, in which the RF resource is shared between two SIMs associated with different RATs (e.g., LTE and GSM or 1xRTT) .
  • sharing the RF resource may involve enabling a tune-away from a network in one RAT (e.g., LTE) to a network in another RAT (e.g., a non-LTE RAT) .
  • LTE Long Term Evolution
  • N-LTE RAT non-LTE RAT
  • the connection with the LTE network may be lost for some time during the tune-away.
  • the wireless communication device may fail to receive a RRC connection release message from the eNodeB.
  • the wireless communication device (or modem stack associated with LTE operations) may continue in an operational RRC connected state, while the corresponding RRC state in the eNodeB may be represented as RRC idle.
  • Such mismatch between the RRC states may have adverse impacts on power consumption by the wireless communication device and/or network resource use by the eNodeB.
  • the wireless communication device may be monitoring the PDCCH according to the CDRX-on periods of a CDRX mode in order to receive downlink signals from the eNodeB.
  • the eNodeB considers the wireless communication device to be in the RRC idle mode, such monitoring during the CDRX-on periods is unnecessary and wastes power.
  • Various existing techniques may address the potential mismatch in RRC states between the wireless communication device (or modem stack associated with LTE operations) and the LTE network (i.e., eNodeB) .
  • such techniques may address the scenario of an operational RRC connected state on the wireless communication device and the corresponding RRC idle state represented in the eNodeB by ensuring that paging messages are received from the eNodeB despite the mismatch.
  • the wireless communication device may decode the PDCCH at the appropriate paging occasion set forth by the IDRX cycle in addition to decoding the PDCCH using the C-RNTI during the CDRX-on periods.
  • the wireless communication device monitors its IDRX cycle paging occasion, which may not fall within or adjacent to the CDRX-on period.
  • the wireless communication device is unable to utilize the power optimized mode described above, and therefore may be less power efficient based on the required wakeup that is independent of the CDRX-on period.
  • MAC layer inactivity timer an inactivity timer for the MAC protocol layer on the wireless communication device.
  • the MAC layer inactivity timer may be started by the wireless communication device (or modem stack associated with LTE operations) upon transitioning to the RRC connected state, and may be set to a default duration (e.g., 60 seconds) . While the MAC layer inactivity timer is running, the wireless communication device may monitor downlink data received from, and uplink data sent to, the eNodeB.
  • the wireless communication device may monitor the PDCCH and the PUCCH to detect signals addressed to, or encrypted using, its C-RNTI. If such signaling is detected prior to expiration of the MAC layer inactivity timer, the wireless communication device may remain in the RRC connected state, with resetting of the MAC layer inactivity timer and the RRC inactivity timer on the eNodeB. If the MAC layer inactivity timer expires without any data exchange detected, the wireless communication device may assume that there is a radio link failure, and trigger an RRC connection reestablishment procedure.
  • Such RRC connection reestablishment procedure reestablishes or reaffirms an operational RRC connected state on the wireless communication device and a corresponding RRC connected state in the eNodeB, resets the MAC layer inactivity timer on the wireless communication device, and resets the RRC inactivity timer on the eNodeB.
  • the RRC connection reestablishment procedure forces the eNodeB and wireless device to re-synchronize by bringing them both to the RRC connected state.
  • configuring the MAC layer inactivity timer to resolve the potential mismatch in the RRC states may introduce additional problems. Specifically, since the duration of the MAC layer inactivity timer is typically set to be shorter than the duration of the RRC inactivity timer (set by the eNodeB) , the RRC connection reestablishment procedure triggered by the expiration of the MAC layer inactivity timer on the wireless communication device will continuously cause resetting of the RRC inactivity timer prior to expiration of the RRC inactivity timer. As a result, the eNodeB may never be able to trigger the RRC connection release procedure, and the wireless communication device may always be prevented from transitioning to the RRC idle state.
  • the various embodiments provide improvements to existing techniques for handling potential loss of RRC connection release messages from an LTE network (i.e., eNodeB) to a CRAT-enabled wireless communication device (or modem stack associated with LTE operations) .
  • the various embodiments avoid negative impacts to power usage and throughput that may result from existing RRC state synchronization mechanisms that provide lengthy tune-away periods to a non-LTE network.
  • the various embodiments may enable resolving a mismatch between the operational RRC state on the wireless communication device and the corresponding RRC state represented in the eNodeB without requiring additional wakeups in the CDRX-off period.
  • Another embodiment may prevent the wireless communication device from entering a perpetual RRC connected state as a result of synchronizing the RRC states between the wireless communication device and the eNodeB through the MAC layer inactivity timer.
  • an LTE network e.g., eNodeB
  • signals over the PDCCH, the resource blocks that are on the PDSCH and the PUSCH and which are allocated to the wireless communication device.
  • a wireless communication device (or modem stack associated with LTE operations) operating in the RRC connected state may initiate a scheduling request (SR) procedure.
  • the wireless communication device may send an SR to the eNodeB in order to obtain an uplink grant for a PUSCH resource allocation.
  • the wireless device may send the SR message on one or more periodic SR resources on the PUCCH that are dedicated for that particular device (i.e., “SR opportunities” ) .
  • the wireless communication device may be dynamically provisioned with an SR cycle that gives the interval between SR opportunities on the PUCCH (for example, about 1–80 ms) .
  • Shorter intervals, and thus more frequent SR opportunities, may be configured for delay critical services, while longer intervals may be specified in order to allow conserving the PUCCH resources when the network is keeping a large number of devices with relatively low activity levels in the RRC connected state.
  • an SR-prohibit timer may be set by the wireless communication device following the transmission of the SR. That is, while the SR-prohibit timer is running, no new SR is transmitted by the wireless communication device.
  • a CRAT-enabled wireless communication device using CDRX may leverage the SR procedure to synchronize the operational RRC in the wireless communication device with the corresponding RRC state represented by the eNodeB prior to expiration of the MAC layer inactivity timer. Specifically, based on the response from the eNodeB following the SR, the wireless communication device may be able to identify, with a high level of confidence, the representative RRC state set in the eNodeB.
  • the wireless communication device receives an uplink grant on the PDCCH (i.e., using the C-RNTI for the modem stack associated with LTE operations) , an assumption may be made that a corresponding RRC connected state is represented in the eNodeB, and therefore the wireless communication device can perform operations under the presumption that the RRC states are already synchronized.
  • This high level of confidence may exist because the likelihood of receiving an uplink grant with a representative RRC idle state in the eNodeB is very low and other events (e.g., the eNodeB assigned the same C-RNTI to another device, etc. ) are unlikely.
  • the wireless communication device can perform operations under the presumption that a corresponding RRC idle state is represented in the eNodeB, and therefore a mismatch exists with the operational RRC connected state in the wireless communication device.
  • a high level of confidence may exist in this presumption because the likelihood of not receiving an uplink grant despite both the operational RRC connected state and the corresponding RRC connected state represented in the eNodeB is relatively low.
  • Reasons for not receiving such an uplink grant may include, for example, high network loading, failure of the eNodeB to decode the PUCCH resulting from timing mis-alignment or other factor separately affecting signaling properties. Therefore in the various embodiments, upon identifying a mismatch in the RRC states, the wireless communication device may determine that synchronization is required.
  • FIGS. 4A and 4B illustrate a method 400 for managing synchronization between RRC states maintained on a CRAT-enabled wireless communication device and represented in a network according to various embodiments. Specifically, such management may improve power usage by avoiding the need for the additional decode of the PDCCH (i.e., in a paging occasion set forth by the IRDX cycle of the device) , which may require an additional wakeup of the RF resource during the CDRX-off period.
  • the operations of the method 400 may be implemented by one or more processors of a wireless device such as wireless communication device 200.
  • the one or more processors may include, for example, such the general purpose processor 206 and/or baseband modem processor (s) 216, or a separate controller (not shown) that may be coupled to the memory 214 and to the baseband modem processor (s) 216.
  • the wireless device processor may detect that the wireless device is operating in the RRC connected state in a network associated with a first RAT (e.g., an LTE network) while supporting communications with at least one other RAT.
  • the wireless communication device e.g., 102, 200
  • the wireless device may have a single RF resource that supports communications on concurrent RATs (e.g., CRAT-enabled wireless device) .
  • the wireless device may be a multi-SIM multi-standby (MSMS) device with at least one SIM supporting LTE, while in other embodiments, the wireless device may be a single radio LTE (SRLTE) wireless device that is configured to connect to at least one hybrid system supporting both LTE and at least one other RAT.
  • the wireless device processor may perform data transmission and reception on a protocol stack associated with the first RAT (e.g., an LTE protocol stack) .
  • the wireless device processor may start a MAC layer inactivity timer on the LTE protocol stack in block 404.
  • the MAC layer inactivity timer may be set to a default value (e.g., 60 seconds) .
  • the MAC layer inactivity timer may be set dynamically based on historical data and/or present network conditions.
  • the wireless device processor may monitor downlink channels (e.g., PDCCH) for a new downlink or uplink resource grant to the LTE protocol stack from the eNodeB. For example, the wireless device processor may decode downlink control information carried on the PDCCH to identify a resource assignment for a C-RNTI associated with the LTE protocol stack. In determination block 412, the wireless device processor may determine whether the TA timer has expired, and the uplink timing alignment with the eNodeB has not been restored.
  • PDCCH downlink channels
  • the wireless device processor may determine whether the TA timer has expired, and the uplink timing alignment with the eNodeB has not been restored.
  • the wireless device processor may return to block 416 to continue to monitor downlink channels for a new downlink or uplink resource grant from the eNodeB.
  • the wireless device processor may implement an un-optimized page decode mode on the LTE protocol stack for the connection with the eNodeB in block 414. The wireless device processor may continue to monitor downlink channels for a new downlink or uplink resource grant from the eNodeB by returning to block 416.
  • the wireless device processor may determine whether a new downlink or uplink resource grant to the LTE protocol stack has been received from an eNodeB in determination block 418 (FIG. 4B), and determine whether the duration of the tune-away to the network associated with the non-LTE RAT was greater than a threshold value in determination block 422 (FIG. 4B) . Since it is assumed that the likelihood of losing an RRC connection release message from the eNodeB increases as the duration of a tune-away increases, the threshold duration may represent a particular level of confidence that such loss has occurred.
  • the wireless device processor may return to monitoring downlink channels for a new downlink or uplink resource grant in block 416 (FIG. 4A) .
  • the wireless device processor may implement a power optimized page decode mode (i.e., decoding any paging occasion during or adjacent to the CDRX-on period) for the connection on the LTE protocol stack in block 420.
  • a new uplink or downlink resource grant received from the eNodeB indicates that the LTE network considers the wireless device to be in the connected state (i.e., a corresponding RRC connected state is represented in the eNodeB) , and therefore the wireless device process can proceed under the presumption that the device is already synchronized with the operational RRC state on the LTE protocol stack. As such, monitoring the paging occasion corresponding to the IDRX cycle for the LTE protocol stack is not needed, which may avoid additional wakeups during the CDRX-off period.
  • the wireless device processor may also return to monitoring downlink channels for a new downlink or uplink resource grant in block 416 (FIG. 4A) .
  • the wireless device may implement, for the connection with the eNodeB, the decode mode that was being used prior to the tune-away (e.g., power optimized page decode mode or un-optimized page decode mode) in block 427. Thereafter, the wireless device processor may also return to monitoring downlink channels for a new downlink or uplink resource grant in block 416 (FIG. 4A).
  • the decode mode e.g., power optimized page decode mode or un-optimized page decode mode
  • the wireless device processor may send one scheduling request (SR) to the eNodeB in block 424.
  • SR scheduling request
  • the SR may be a dummy request.
  • the SR (or dummy SR) may be a transmission sent on the PUCCH as described.
  • the wireless device processor may start an SR-prohibit timer for the one SR, and in determination block 428 the wireless device processor may determine whether the LTE protocol stack receives an uplink resource grant from the eNodeB before expiration of the SR-prohibit timer.
  • the wireless device processor may implement the un-optimized page decode mode on the LTE protocol stack for the connection with the eNodeB in block 430. That is, based on the lack of response from the eNodeB, it is assumed that the LTE network considers the wireless device to be in the RRC idle state (i.e., a corresponding RRC idle state is represented in the eNodeB) , and is therefore not synchronized with the operational RRC connected state on the wireless device.
  • the wireless device may decode the PDCCH for downlink data during the CDRX-on periods, as well as during the paging occasion associated with the paging group to which the wireless device belongs, which may be during the CDRX-off period. Thereafter, the wireless device processor may continue to monitor downlink channels for a new downlink or uplink resource grant from the eNodeB in block 416 (FIG. 4A) .
  • the wireless device processor may implement the power optimized page decode mode on the LTE protocol stack for the connection with the eNodeB in block 432. Thereafter, the wireless device processor may continue to monitor downlink channels for a new downlink or uplink resource grant from the eNodeB in block 416 (FIG. 4A) .
  • the expiration of the MAC layer inactivity timer may trigger an RRC reestablishment message to be sent to the LTE network by the wireless device, which may in turn cause a longer RRC inactivity timer on the LTE network to be reset prior to expiration.
  • the LTE protocol stack may be put in an infinite loop of an operational RRC connected state in the wireless device. Therefore, in some embodiments, power usage may be improved on the wireless device following expiration of the MAC layer inactivity timer by forcing release of the RRC connection when needed, as provided in method 500 illustrated in FIG. 5.
  • the method 500 may be implemented independent of method 400, while in other embodiments method 500 may provide an optional add-on process to method 400 once the MAC layer inactivity timer has expired in determination block 708 (FIG. 4A) . Further, the operations of the method 500 may be implemented by one or more processors of the wireless device 200, such as the general purpose processor 206 and/or baseband modem processor (s) 216, or a separate controller (not shown) that may be coupled to the memory 214 and to the baseband modem processor (s) 216.
  • processors of the wireless device 200 such as the general purpose processor 206 and/or baseband modem processor (s) 216, or a separate controller (not shown) that may be coupled to the memory 214 and to the baseband modem processor (s) 216.
  • the RRC connection reestablishment procedure may be triggered in block 502, for example, as a result of the declaring a radio link failure on the LTE protocol stack, as described.
  • SR counter scheduling request counter
  • the wireless device processor may increment the SR counter in block 514, and determine whether the SR counter value is greater than an SR threshold in determination block 516.
  • the LTE network may configure an RRC parameter that sets a maximum number of instances that the wireless device processor is allowed to transmit/re-transmit the scheduling request (e.g., dsr-TransMax) , which has a value of at least four.
  • the SR threshold may be set as: Max [3, (dsr-TransMax) /2) ] . That is, the SR threshold may be the larger of the value 3 and one-half of the dsr-TransMax value.
  • the wireless device processor may return to send a next SR to the eNodeB in block 508.
  • the wireless device processor may perform a local release of the RRC connection in block 518, thereby releasing radio resources and causing the LTE protocol stack to transition to an operational RRC idle state. That is, following a number of attempts to send the scheduling request without response, there may be a high level of confidence that a representative RRC idle state is set in the eNodeB. However, since the RRC connection is prevented from being be released by the LTE network based on the continued reset of the RRC inactivity timer, the wireless device processor may perform signaling to force a transition to the RRC idle state on the LTE protocol stack.
  • the wireless device processor may avoid using the un-optimized page decode mode as much as possible in order to improve power usage prior to expiration of the MAC layer inactivity timer.
  • the various embodiments describe improving power efficiency with respect to at least one SIM and RF resource configured to support multiple RATs (e.g., LTE and one or more of GSM, CDMA2000, etc. ) .
  • RATs e.g., LTE and one or more of GSM, CDMA2000, etc.
  • the wireless device processor may assign any indicator, name or other designation to differentiate receive chains associated with one or more RAT and/or protocol stack. Further, the embodiment methods apply the same regardless of which receive chain is being used to tune away from the network of the data communication.
  • the network of the data communication is referenced as an LTE network or eNodeB, these references are also illustrative examples and the various embodiments may be implemented for receiving data in any of a variety of high-speed networks (e.g., HSPA+, DC-HSPA, EV-DO, etc. ) .
  • high-speed networks e.g., HSPA+, DC-HSPA, EV-DO, etc.
  • the wireless device 600 may include a processor 602 coupled to a touchscreen controller 604 and an internal memory 606.
  • the processor 602 may be one or more multicore ICs designated for general or specific processing tasks.
  • the internal memory 606 may be volatile or non-volatile memory, and may also be secure and/or encrypted memory, or unsecure and/or unencrypted memory, or any combination thereof.
  • the touchscreen controller 604 and the processor 602 may also be coupled to a touchscreen panel 612, such as a resistive-sensing touchscreen, capacitive-sensing touchscreen, infrared sensing touchscreen, etc.
  • the wireless device 600 may have one or more radio signal transceivers 608 (e.g., Wi-Fi, RF radio) and antennas 610, for sending and receiving, coupled to each other and/or to the processor 602.
  • the transceivers 608 and antennas 610 may be used with the above-mentioned circuitry to implement the various wireless transmission protocol stacks and interfaces.
  • the wireless device 600 may include a cellular network wireless modem chip 616 that enables communication via a cellular network and is coupled to the processor.
  • the wireless device 600 may include a peripheral device connection interface 618 coupled to the processor 602.
  • the peripheral device connection interface 618 may be singularly configured to accept one type of connection, or multiply configured to accept various types of physical and communication connections, common or proprietary, such as USB, FireWire, Thunderbolt, or PCIe.
  • the peripheral device connection interface 618 may also be coupled to a similarly configured peripheral device connection port (not shown) .
  • the wireless device 600 may also include speakers 614 for providing audio outputs.
  • the wireless device 600 may also include a housing 620, constructed of a plastic, metal, or a combination of materials, for containing all or some of the components discussed herein.
  • the wireless device 600 may include a power source 622 coupled to the processor 602, such as a disposable or rechargeable battery.
  • the rechargeable battery may also be coupled to the peripheral device connection port to receive a charging current from a source external to the wireless device 600.
  • the laptop computer 700 may include a touchpad touch surface 717 that serves as the computer’s pointing device, and thus may receive drag, scroll, and flick gestures similar to those implemented on wireless computing devices equipped with a touchscreen display and described above.
  • a laptop computer 700 will typically include a processor 711 coupled to volatile memory 712 and a large capacity nonvolatile memory, such as a disk drive 713 of Flash memory.
  • the computer 700 may also include a floppy disc drive 714 and a compact disc (CD) drive 715 coupled to the processor 711.
  • the computer 700 may also include a number of connector ports coupled to the processor 711 for establishing data connections or receiving external memory devices, such as a USB or Fire connector sockets, or other network connection circuits for coupling the processor 711 to a network.
  • the computer housing includes the touchpad 717, the keyboard 718, and the display 719 all coupled to the processor 711.
  • Other configurations of the computing device may include a computer mouse or trackball coupled to the processor (e.g., via a USB input) as are well known, which may also be used in conjunction with various embodiments.
  • the processors 602 and 711 may be any programmable microprocessor, microcomputer or multiple processor chip or chips that can be configured by software instructions (applications) to perform a variety of functions, including the functions of various embodiments described above. In some devices, multiple processors may be provided, such as one processor dedicated to wireless communication functions and one processor dedicated to running other applications. Typically, software applications may be stored in the internal memory 606, 712 and 713 before they are accessed and loaded into the processors 602 and 711.
  • the processors 602 and 711 may include internal memory sufficient to store the application software instructions. In many devices the internal memory may be a volatile or nonvolatile memory, such as flash memory, or a mixture of both. For the purposes of this description, a general reference to memory refers to memory accessible by the processors 602, 711, including internal memory or removable memory plugged into the device and memory within the processor 602 and 711, themselves.
  • first and second are used herein to describe data transmission associated with a SIM and data receiving associated with a different SIM, such identifiers are merely for convenience and are not meant to limit the various embodiments to a particular order, sequence, type of network or carrier.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. Alternatively, some steps or methods may be performed by circuitry that is specific to a given function.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored as one or more instructions or code on a non-transitory computer-readable medium or non-transitory processor-readable medium. The steps of a method or algorithm disclosed herein may be embodied in a processor-executable software module which may reside on a non-transitory computer-readable or processor-readable storage medium. Non-transitory computer-readable or processor-readable storage media may be any storage media that may be accessed by a computer or a processor.
  • non-transitory computer-readable or processor-readable media may include RAM, ROM, EEPROM, FLASH memory, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures and that may be accessed by a computer.
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of non-transitory computer-readable and processor-readable media.
  • the operations of a method or algorithm may reside as one or any combination or set of codes and/or instructions on a non-transitory processor-readable medium and/or computer-readable medium, which may be incorporated into a computer program product.

Landscapes

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

Abstract

L'invention concerne des procédés et des dispositifs se rapportant à la gestion de la synchronisation d'un état de commande des ressources radio (RRC) sur un dispositif de communications sans fil doté d'une ressource de radiofréquence (RF) prenant en charge l'activité de réception de deux technologies d'accès radio (RAT). Lorsqu'une première pile de protocole est dans un état connecté de RRC, un détachement de la ressource de RF étant effectué pour la deuxième RAT et un temporisateur d'inactivité de couche de commande d'accès au support sur la première pile de protocole n'ayant pas expiré, le dispositif sans fil peut déterminer si une nouvelle attribution de ressources est reçue en provenance du réseau de la première RAT si la première pile de protocole fonctionne dans un mode connecté de réception discontinue. Si c'est le cas et si l'état opérationnel de RRC de la première pile de protocole diffère potentiellement d'un état de RRC correspondant établi dans le réseau de la première RAT, le dispositif sans fil peut envoyer une demande de programmation au réseau de la première RAT et sélectionner un mode de décodage de pages pour la première pile de protocole en fonction de la réponse du réseau de la première RAT.
PCT/CN2015/080234 2015-05-29 2015-05-29 Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio WO2016191916A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2015/080234 WO2016191916A1 (fr) 2015-05-29 2015-05-29 Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio
TW105116710A TW201701634A (zh) 2015-05-29 2016-05-27 用於在支援並行無線電存取技術的無線通訊設備中管理無線電資源控制（ｒｒｃ）狀態的系統及方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2015/080234 WO2016191916A1 (fr) 2015-05-29 2015-05-29 Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio

Publications (1)

Publication Number Publication Date
WO2016191916A1 true WO2016191916A1 (fr) 2016-12-08

Family

ID=57439700

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/080234 WO2016191916A1 (fr) 2015-05-29 2015-05-29 Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio

Country Status (2)

Country Link
TW (1) TW201701634A (fr)
WO (1) WO2016191916A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10334527B2 (en) 2017-08-11 2019-06-25 Qualcomm Incorporated Method and/or system for scheduling multiple receive chains
CN110603895A (zh) * 2017-08-02 2019-12-20 Oppo广东移动通信有限公司 跃迁方法、网络设备和终端设备
CN110958674A (zh) * 2018-09-27 2020-04-03 苹果公司 睡眠状态中的附件的低功率激活
US10925056B2 (en) 2018-06-29 2021-02-16 Intel Corporation Multimode device priority access management
CN113473589A (zh) * 2020-03-31 2021-10-01 华为技术有限公司 一种定时提前量的确定方法及通信装置
US20220053520A1 (en) * 2020-08-13 2022-02-17 Qualcomm Incorporated Scheduling communication for multiple subscriber identity modules over a single communication link
US11399273B2 (en) 2019-10-04 2022-07-26 Apple Inc. Multiple SIM card operation of an electronic device
WO2023010453A1 (fr) * 2021-08-05 2023-02-09 Apple Inc. Intervalles de programmation de multiples sim

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10813097B2 (en) * 2017-06-14 2020-10-20 Qualcomm Incorporated System and method for transmitting beam failure recovery request
US10517045B2 (en) 2017-11-17 2019-12-24 Qualcomm Incorporated Techniques for power control using carrier aggregation in wireless communications
TWI762019B (zh) * 2020-11-06 2022-04-21 緯創資通股份有限公司 無線網路連結管理方法
US11832336B2 (en) * 2021-10-14 2023-11-28 Qualcomm Incorporated CDRX and IDRX collisions

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101022648A (zh) * 2006-02-14 2007-08-22 中兴通讯股份有限公司 宽带码分多址系统寻呼触发的资源释放方法
US20130215834A1 (en) * 2012-02-16 2013-08-22 Apple Inc. Method for out of sync identification
US20130260758A1 (en) * 2012-03-30 2013-10-03 Apple Inc. Apparatus and methods for synchronization recovery in a hybrid network
US20140146759A1 (en) * 2012-11-23 2014-05-29 Samsung Electronics Co., Ltd. System, method and apparatus for addressing mismatch of radio resource control status in wireless communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101022648A (zh) * 2006-02-14 2007-08-22 中兴通讯股份有限公司 宽带码分多址系统寻呼触发的资源释放方法
US20130215834A1 (en) * 2012-02-16 2013-08-22 Apple Inc. Method for out of sync identification
US20130260758A1 (en) * 2012-03-30 2013-10-03 Apple Inc. Apparatus and methods for synchronization recovery in a hybrid network
US20140146759A1 (en) * 2012-11-23 2014-05-29 Samsung Electronics Co., Ltd. System, method and apparatus for addressing mismatch of radio resource control status in wireless communication system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110603895A (zh) * 2017-08-02 2019-12-20 Oppo广东移动通信有限公司 跃迁方法、网络设备和终端设备
US10334527B2 (en) 2017-08-11 2019-06-25 Qualcomm Incorporated Method and/or system for scheduling multiple receive chains
US10925056B2 (en) 2018-06-29 2021-02-16 Intel Corporation Multimode device priority access management
CN110958674A (zh) * 2018-09-27 2020-04-03 苹果公司 睡眠状态中的附件的低功率激活
CN110958674B (zh) * 2018-09-27 2023-05-16 苹果公司 睡眠状态中的附件的低功率激活
US11743819B2 (en) 2018-09-27 2023-08-29 Apple Inc. Low-power activation of accessory in sleep state
US11399273B2 (en) 2019-10-04 2022-07-26 Apple Inc. Multiple SIM card operation of an electronic device
CN113473589A (zh) * 2020-03-31 2021-10-01 华为技术有限公司 一种定时提前量的确定方法及通信装置
CN113473589B (zh) * 2020-03-31 2022-12-06 华为技术有限公司 一种定时提前量的确定方法及通信装置
US20220053520A1 (en) * 2020-08-13 2022-02-17 Qualcomm Incorporated Scheduling communication for multiple subscriber identity modules over a single communication link
WO2022035933A1 (fr) * 2020-08-13 2022-02-17 Qualcomm Incorporated Planification d'une communication pour de multiples modules d'identité d'abonné sur une seule liaison de communication
WO2023010453A1 (fr) * 2021-08-05 2023-02-09 Apple Inc. Intervalles de programmation de multiples sim

Also Published As

Publication number Publication date
TW201701634A (zh) 2017-01-01

Similar Documents

Publication Publication Date Title
US10034320B2 (en) System and methods for performing an adaptive access procedure on a multi-SIM wireless communication device
EP3563609B1 (fr) Systèmes et procédés de maintien d'un service sur des sim multiples dans un dispositif de communication sans fil fonctionnant dans un mode multi-sim multi-veille (msms)
WO2016191916A1 (fr) Système et procédés de gestion d'un état de commande des ressources radio (rrc) dans un dispositif de communications sans fil prenant en charge simultanément des technologies d'accès radio
US20180220329A1 (en) System and Methods for Improving Performance in a Multi-SIM Wireless Communication Device Using Voice-Over-Wireless Local Area Network Service
US9648634B2 (en) System and methods for providing a transmission skipping policy to improve performance in a multi-subscriber identity module (SIM) wireless communication device
CN108886828B (zh) 用于在无线通信设备上通过相同载波频率执行多个用户识别模块(sim)功能的系统和方法
US9980275B2 (en) Systems and methods for improving call performance during cell selection on a multi-subscriber identity module (SIM) wireless communication device
CN108293215B (zh) 用于在无线通信设备中避免呼叫性能降级的系统和方法
US20180070327A1 (en) System and Methods for Performing an Early Radio Link Recovery Procedure on a Multi-Subscriber Identity Module Wireless Communication Device
US20160198352A1 (en) System and Methods for Improving Data Performance Via Deliberate Hybrid Automatic Repeat Request (HARQ) Acknowledgment (ACK) and Fast Radio Link Control (RLC) Non-acknowledgment (NACK) in a Multi-Subscriber Identity Module (SIM) Wireless Communication Device
US20160134316A1 (en) System and Methods for Enabling MIMO Operation During Inactive SIM State on a Multi-SIM Wireless Communication Device
US9420480B2 (en) Fast scan algorithm for higher priority service search
US20170134298A1 (en) System and Methods for Improving Support of a Virtual Subscriber Identity Module (SIM) in a Multi-SIM Wireless Communication Device
US9307394B2 (en) Devices and methods for preventing out-of-service periods in multi-subscription scenarios
US20180139788A1 (en) Establishing Emergency Calls on Mobile Devices
WO2017140082A1 (fr) Système et procédés pour améliorer les performances durant un état à connexion de commande de ressource radio (rrc) sur un dispositif de communication sans fil prenant en charge des technologies d'accès radio simultanées
US20170048768A1 (en) Handoff procedures in mobile devices
US20180013462A1 (en) Hs-scch order recovery in multi-subscriber identity module (sim) wireless communication devices

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15893579

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15893579

Country of ref document: EP

Kind code of ref document: A1