WO2016191939A1 - Gestion de liaison de communication après un décrochage - Google Patents

Gestion de liaison de communication après un décrochage Download PDF

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Publication number
WO2016191939A1
WO2016191939A1 PCT/CN2015/080275 CN2015080275W WO2016191939A1 WO 2016191939 A1 WO2016191939 A1 WO 2016191939A1 CN 2015080275 W CN2015080275 W CN 2015080275W WO 2016191939 A1 WO2016191939 A1 WO 2016191939A1
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WO
WIPO (PCT)
Prior art keywords
determining
response
threshold
subscription
equal
Prior art date
Application number
PCT/CN2015/080275
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English (en)
Inventor
Jiming Guo
Ling Xie
Chintan Shirish SHAH
Peng Wu
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2015/080275 priority Critical patent/WO2016191939A1/fr
Priority to TW105116711A priority patent/TW201701697A/zh
Publication of WO2016191939A1 publication Critical patent/WO2016191939A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • Wireless devices having multiple subscriber identity modules may communicate with two or more cells of a wireless network.
  • Some multi-subscription multi-standby communication devices may allow two or more network interfaces or subscriber identity modules (SIMs) to share a single radio frequency (RF) resource (e.g., dual-SIM dual-standby, or “DSDS” devices) .
  • RF radio frequency
  • the multi-subscription multi-standby communication device may employ a “tune-away” procedure to monitor multiple interfaces in a standby mode by tuning to one network in a primary cell, quickly tuning away to the second network in a second cell for a short time, and then tuning back to the first network to continue a voice or data call.
  • This tune-away procedure may allow the multi-subscription multi-standby communication device to monitor for pages or other indications of incoming messages or data received on the second network.
  • tuning away to another network interrupts communications with the first network, and may reduce throughput of communications between the first network and the multi-subscription multi-standby communication device.
  • Systems, methods, and devices of various embodiments enable a multi-subscription multi-standby communication device to manage a communication link of a first subscription by a processor of a multi-subscription multi-standby communication device by determining whether a tune-away period was greater than or equal to a tune-away period threshold upon returning to the first subscription after a tune away to a second subscription, reducing a scheduling request threshold in response to determining that the tune-away period was greater than or equal to the tune-away period threshold, determining whether a number of sent scheduling requests is greater than or equal to the reduced scheduling request threshold, sending one or more scheduling requests in response to determining that the number of sent scheduling requests is not greater than or equal to the reduced scheduling request threshold, reducing a random access channel request threshold in response to determining that the number of sent scheduling requests is greater than or equal to the reduced scheduling request threshold, determining whether a number of sent random access channel requests is greater than or equal to the reduced random access channel request threshold, sending one or more random channel request in response to determining that the number of sent random access channel
  • reducing a scheduling request threshold in response to determining that the tune-away period is greater than or equal to the tune-away period threshold may include determining whether data is queued for uplink transmission in response to determining that the tune-away period is greater than or equal to the tune-away period threshold, and reducing the scheduling request threshold in response to determining that the tune-away period is greater than or equal to the tune-away period threshold and that data is queued for uplink transmission.
  • Various embodiments may further include determining whether an uplink grant is received in response to the one or more scheduling requests, and resetting the scheduling request threshold in response to determining that an uplink grant is received.
  • Various embodiments may further include determining whether a channel is granted in response to the one or more random access channel requests, and resetting the random access channel request threshold in response to determining that a channel is granted.
  • Various embodiments may further include determining whether downlink feedback is received in response to determining that one of an uplink grant is received and a channel is granted, and reducing a duration of an uplink inactivity timer in response to determining that downlink feedback is not received.
  • Various embodiments may further include declaring a radio link failure in response to determining that the uplink inactivity timer has expired.
  • Various embodiments may further include determining whether uplink data is transmitted over the communication link, reducing a permitted retransmissions threshold in response to determining that uplink data has been transmitted, and sending one or more uplink retransmissions in response to determining that downlink feedback is not detected.
  • Various embodiments may further include declaring a radio link failure in response to determining that a number of uplink retransmissions is greater than or equal to the reduced permitted retransmissions threshold.
  • Various embodiments may further include resetting the permitted retransmissions threshold in response to determining that downlink feedback is detected.
  • declaring a radio link failure of the communication link of the first subscription may include initiating a connection re-establishment procedure for the communication link of the first subscription.
  • Various embodiments include a multi-subscription communication device including a processor configured with processor-executable instructions to perform operations of the aspect methods described above.
  • Various embodiments also include a non-transitory processor-readable storage medium having stored thereon processor-executable software instructions configured to cause a processor to perform operations of the aspect methods described above.
  • Various embodiments also include a multi-subscription communication device that includes means for performing functions of the operations of the aspect methods described above.
  • FIG. 1 is a component block diagram of a communication system suitable for use with various embodiments.
  • FIG. 2 is a component block diagram of a multi-subscription multi-standby communication device according to various embodiments.
  • FIG. 3 is a process flow diagram illustrating a method for managing a communication link of a first subscription following a tune away to a second subscription by a processor of a multi-subscription multi-standby communication device according to various embodiments.
  • FIG. 4 is a process flow diagram illustrating a method for managing a communication link of a first subscription following a tune away to a second subscription by a processor of a multi-subscription multi-standby communication device according to various embodiments.
  • FIG. 5 is a component block diagram of a mobile communication device suitable for use with various embodiments.
  • Various embodiments include methods implemented in multi-subscription multi-standby communication devices that enable decoding of system information of a plurality of communication networks received by a processor of a multi-subscription multi-standby communication device in a manner that reduces the time required to receive the system information of each communication network.
  • multi-subscription multi-standby communication device wireless device, ” “communication device, ” and “mobile communication device” are used interchangeably herein to refer to any one or all of cellular telephones, smartphones, personal or mobile multi-media players, personal data assistants, laptop computers, tablet computers, smartbooks, palmtop computers, wireless electronic mail receivers, multimedia Internet enabled cellular telephones, wireless gaming controllers, and similar electronic devices and portable computing platforms which include a programmable processor and a memory.
  • Various embodiments may be particularly useful in any communication devices that can support multiple wireless wide area network subscriptions and receive cell broadcasts.
  • One or more components may reside within a process and/or thread of execution and a component may be localized on one processor or core and/or distributed between two or more processors or cores. In addition, these components may execute from various non-transitory computer readable media having various instructions and/or data structures stored thereon. Components may communicate by way of local and/or remote processes, function or procedure calls, electronic signals, data packets, memory read/writes, and other known computer, processor, and/or process related communication methodologies.
  • Multi-subscription communication devices that allow two or more network interfaces or SIMs to share a single RF resource are referred to as multi-subscription multi-standby communication devices.
  • the RF resource in such devices can only tune to a single network at a time.
  • a multi-subscription multi-standby communication device may employ a “tune-away” procedure to monitor multiple interfaces when the device is tuned to a first network (i.e., tuned to a carrier signal associated with the first network) , quickly tuning away to a second network for a short time (i.e., tuning to another carrier signal of the second network) , and then tuning back to the first network to continue a voice or data call.
  • This tune-away procedure may enable the multi-subscription multi-standby communication device to monitor paging or system information from two or more communication networks.
  • the tune-away procedure may also allow the multi-subscription multi-standby communication device to support an active call on a first subscription with a first network while monitoring for pages or other indications of incoming messages or data on a second subscription received from a second network.
  • references to “first network, ” “first subscription, ” “second network” and “second subscription” are arbitrary and are used to refer to two or more subscriptions/networks generally because at any given time either subscription/network may be in an active mode (on an active voice or data call) or a standby mode.
  • one minute a GSM subscription with a GSM network may be on an active data call (and thus a “first subscription) while a WCDMA subscription with a WCDMA network is in the standby mode (and thus a “second” subscription)
  • the next minute the WCDMA subscription may enter an active data call (becoming the “first” subscription) and the GSM subscription may enter the standby mode (becoming the “second” subscription) .
  • references to “first” and “second” subscriptions and networks is not intended to imply that the embodiments are limited to two subscriptions sharing one RF resource, because three or more subscriptions may share one RF resource provided that only one subscription can use the RF resource at a time.
  • Third and fourth subscriptions would behave similar to a second subscription. Therefore, in the interest of brevity, operations of subscriptions in the standby mode that share the RF resource during tune-away periods are described generally with reference to the “second” subscription.
  • a multi-subscription multi-standby communication device may include two or more subscriber identity module (SIM) cards, each associated with a different service provider subscription.
  • SIM subscriber identity module
  • a multi-subscription multi-standby communication device may support a range of communication technologies and configurations, including Dual-SIM Dual-Standby (DSDS) in which two SIMs use one radio.
  • MSMS devices may also use different radio access technology (RAT) protocols (e.g., GSM, LTE, WCDMA, 1xRTT, etc. ) .
  • RAT radio access technology
  • Communications by a multi-subscription multi-standby communication device using two or more RATs concurrently may be referred to as concurrent RAT (CRAT) .
  • CRAT concurrent RAT
  • a multi-subscription multi-standby communication device may use a single shared receiver and/or transmitter chain to access LTE for data and GSM or 1xRTT for voice calls (i.e., GSM/SRLTE (single radio LTE) or 1x SRLTE) .
  • a multi-subscription multi-standby communication device e.g., LTE DSDS
  • a multi-subscription multi-standby communication device with a single receiver and/or transmitter chain may only tune the receiver/transmitter chain to a single network at a time
  • the multi-subscription multi-standby communication device typically uses a “tune-away” procedure to support CRAT communications (i.e., time sharing the single receiver/transmitter chain) .
  • the multi-subscription multi-standby communication device may be camped on, or may conduct a communication session over a first network (e.g., using a first subscription) , may quickly tune away to a second network (e.g., using a second subscription) for a short time (e.g., to monitor for pages or other indications of incoming messages or data received on the second network) , and then tune back to the first network to continue the voice or data call.
  • a first network e.g., using a first subscription
  • a second network e.g., using a second subscription
  • a short time e.g., to monitor for pages or other indications of incoming messages or data received on the second network
  • Performing a tune away to another network interrupts transmissions to the first network during the period of the tune away (a “tune-away period” ) , and can reduce throughput of data transmitted to and from the first network for the multi-subscription multi-standby communication device.
  • a multi-subscription multi-standby communication device using LTE DSDS or SRLTE performs a lengthy tune away to the second network
  • the multi-subscription multi-standby communication device may experience difficulties re-establishing communications over the first network, and may experience radio link failure (RLF) and/or data session interruption, particularly when the multi-subscription multi-standby communication device is highly mobile.
  • RLF radio link failure
  • Various embodiments enable a multi-subscription multi-standby communication device to declare (e.g., by triggering a determination) a radio link failure to more quickly recover a failed data communication session upon tuning back to a first network following a tune-away under certain circumstances determined by a series of tests.
  • the multi-subscription multi-standby communication device may determine whether the tune-away period exceeds a tune-away period threshold.
  • the multi-subscription multi-standby communication device may also determine whether the multi-subscription multi-standby communication device has any data queued for transmission to the first network.
  • the multi-subscription multi-standby communication device may determine whether an uplink grant is received by the multi-subscription multi-standby communication device, e.g., from a base station of the first network.
  • the uplink grant may include resources on the uplink portion of the communication link with the first communication network that may permit the multi-subscription multi-standby communication device to transmit data that is queued for uplink transmission to the first communication network
  • the multi-subscription multi-standby communication device may reduce a permitted number of uplink scheduling requests (SR) that the MSMS device may transmit to the first network. If the network grants uplink resources to the multi-subscription multi-standby communication device in response to one or more scheduling requests (i.e., an uplink grant is received) , the multi-subscription multi-standby communication device may reset the permitted number of scheduling requests and conduct network communications, e.g., in a normal connected mode (e.g., RRC_Connected mode in LTE) .
  • a normal connected mode e.g., RRC_Connected mode in LTE
  • the reduced number of permitted scheduling requests may be determined based on channel conditions (e.g., received signal strength, a received signal strength indicator (RSSI) , a received signal reference power (RSRP) , or another received signal strength and/or signal strength indication such as a path loss estimate) .
  • channel conditions e.g., received signal strength, a received signal strength indicator (RSSI) , a received signal reference power (RSRP) , or another received signal strength and/or signal strength indication such as a path loss estimate.
  • the multi-subscription multi-standby communication device may determine a smaller number of permitted scheduling requests when the determined channel conditions are relatively good (i.e., the better the channel conditions, the fewer the number of permitted scheduling requests) , to enable the multi-subscription multi-standby communication device to more quickly declare radio link failure and initiate a connection re-establishment procedure for the first communication link of the first subscription.
  • the multi-subscription multi-standby communication device may reduce a permitted number of random access channel (RACH) requests that the multi-subscription multi-standby communication device may transmit to the first network. If the network grants a channel to the multi-subscription multi-standby communication device, the multi-subscription multi-standby communication device may reset the permitted number of RACH requests and may conduct network communications, e.g., in a normal connected mode (e.g., RRC_Connected mode in LTE) . In some embodiments, in response to determining that the number of RACH requests transmitted by the multi-subscription multi-standby communication device exceeds the reduced permitted number of RACH requests, the multi-subscription multi-standby communication device may declare a radio link.
  • RACH random access channel
  • the multi-subscription multi-standby communication device may determine the reduced number of RACH requests based on the determined channel conditions. For example, the better the determined channel conditions, the fewer the number of permitted RACH requests that the multi-subscription multi-standby communication device may determine, to enable the multi-subscription multi-standby communication device to more quickly declare radio link failure and initiate a connection re-establishment procedure for the first communication link of the first subscription.
  • the multi-subscription multi-standby communication device may determine whether sufficient uplink (UL) resources (e.g., slots, frames, resource blocks, resource elements, or other uplink resources) are granted by the network to enable the multi-subscription multi-standby communication device to transmit the uplink data pending transmission to the network (i.e., the pending UL data) .
  • the multi-subscription multi-standby communication device may determine a reduced duration for an uplink inactivity timer for each resource bearer with pending uplink data, and the multi-subscription multi-standby communication device may start each uplink inactivity timer using its respective reduced timer duration.
  • each uplink inactivity timer may be determined based on channel conditions, such as the better the channel conditions, the smaller the timer duration, to enable the multi-subscription multi-standby communication device to more quickly determine a radio link failure.
  • the multi-subscription multi-standby communication device may declare radio link failure for that resource bearer and attempt to reestablish that resource bearer.
  • the multi-subscription multi-standby communication device may determine whether the multi-subscription multi-standby communication device receives downlink radio link control (DL RLC) feedback or control data feedback (e.g., an ACK) from the first network.
  • DL RLC downlink radio link control
  • control data feedback e.g., an ACK
  • the multi-subscription multi-standby communication device may determine a reduced number of permitted uplink retransmissions.
  • the number of permitted retransmissions may be based on the channel conditions (e.g., the better the channel conditions, the smaller the number of permitted retransmissions) to enable the multi-subscription multi-standby communication device to more quickly determine a radio link failure.
  • the multi-subscription multi-standby communication device may declare a radio link failure.
  • the multi-subscription multi-standby communication device may initiate a connection re-establishment procedure (e.g., an RRC Connection re-establishment procedure in LTE) .
  • a connection re-establishment procedure e.g., an RRC Connection re-establishment procedure in LTE
  • a first communication network 102 and a second communication network 104 each may include a plurality of cellular base stations (e.g., a first base station 130 and a second base station 140) .
  • a multi-subscription multi-standby communication device 110 may communicate with the first communication network 102 through a communication link 132 to the first base station 130.
  • the mobile communication device 110 may also communicate with the second mobile network 104 through a communication link 142 to the second base station 140.
  • the first base station 130 may communicate with the first communication network 102 over a wired or wireless communication link 134, and the second base station 140 may communicate with the second communication network 104 over a wired or wireless communication link 144.
  • the communication links 134 and 144 may include fiber optic backhaul links, microwave backhaul links, and other similar communication links.
  • Each of the communication networks 102 and 104 may support communications using one or more radio access technologies (RATs) , and each of the communication links 132, 134, 142, and 144 may include cellular connections that may be made through two-way wireless communication links using one or more RATs.
  • RATs may include 3GPP Long Term Evolution (LTE) , Worldwide Interoperability for Microwave Access (WiMAX) , Code Division Multiple Access (CDMA) , Time Division Multiple Access (TDMA) , Wideband CDMA (WCDMA) , Global System for Mobility (GSM) , and other RATs.
  • LTE Long Term Evolution
  • WiMAX Worldwide Interoperability for Microwave Access
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • WCDMA Wideband CDMA
  • GSM Global System for Mobility
  • each of the communication links 132, 134, 142, and 144 are illustrated as single links, each of the communication links may include a plurality of frequencies or frequency bands, each of which may include a plurality of logical channels. Additionally, each of the communication links 132, 134, 142, and 144 may utilize more than one RAT.
  • FIG. 2 is a component block diagram of a multi-subscription multi-standby communication device 200 suitable for implementing various embodiments.
  • the multi-subscription multi-standby communication device 200 may be similar to the multi-subscription multi-standby communication device 110.
  • the multi-subscription multi-standby communication device 200 may include a first SIM interface 202a, which may receive a first identity module SIM-1 204a that is associated with a first subscription.
  • the multi-subscription multi-standby communication device 200 may optionally also include a second SIM interface 202b, which may receive a second identity module SIM-2 204b that is associated with a second subscription.
  • a SIM in various embodiments may be a Universal Integrated Circuit Card (UICC) that is configured with SIM and/or USIM (Universal Subscriber Identity Module) applications, enabling access to, for example, 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 card may have a CPU, ROM, RAM, EEPROM and I/O circuits.
  • a SIM used in various embodiments may contain user account information, an international mobile subscriber identity (IMSI) , a set of SIM application toolkit (SAT) commands and storage space for phone book contacts.
  • a SIM card may further store a Home-Public-Land-Mobile-Network (HPLMN) code to indicate the SIM card network operator provider.
  • the multi-subscription multi-standby 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 computer-readable storage medium that stores processor-executable instructions.
  • the memory 214 may store an operating system (OS) , as well as user application software and executable instructions.
  • the memory 214 may also store application data, such as an array data structure.
  • the general purpose processor 206 may be coupled to a modem 230.
  • the modem 230 may include at least one baseband modem processor 216, which may be coupled to a memory 222 and a modulator/demodulator 228.
  • the baseband modem processor 216 may include physically or logically separate baseband modem processors (e.g., BB1, BB2) .
  • the modulator/demodulator 228 may receive data from the baseband modem processor 216 and may modulate a carrier signal with encoded data and provide the modulated signal to one or more RF resources 218a, 218b for transmission.
  • the modulator/demodulator 228 may also extract an information-bearing signal from a modulated carrier wave received from the one or more RF resources 218a, 218b, and may provide the demodulated signal to the baseband modem processor 216.
  • the modulator/demodulator 228 may be or include a digital signal processor (DSP) .
  • DSP digital signal processor
  • the baseband modem processor 216 may read and write information to and from the memory 222.
  • the memory 222 may also store instructions associated with a protocol stack, such as protocol stack S1 222a and protocol stack S2 222b.
  • the protocol stacks S1 222a, S2 222b generally include computer executable instructions to enable communication using a radio access protocol or communication protocol.
  • Each protocol stack S1 222a, S2 222b typically includes network protocol layers structured hierarchically to provide networking capabilities.
  • the modem 230 may include one or more of the protocol stacks S1 222a, S2 222b to enable communication using one or more RATs.
  • the protocol stacks S1 222a, S2 222b may be associated with a SIM card (e.g., SIM-1 204a, SIM-2 204b) configured with a subscription.
  • the protocol stack S1 222a and the protocol stack S2 222b may be associated with the SIM-1 204a.
  • the illustration of only two protocol stacks S1 222a, S2 222b is not intended as a limitation, and the memory 222 may store more than two protocol stacks (not illustrated) .
  • Each SIM and/or RAT in the multi-subscription multi-standby communication device 200 may be coupled to the modem 230 and may be associated with or permitted to use an RF resource.
  • the term “RF resource” is used herein to refer to all of the circuitry used to send and receive RF signals, which may include the baseband modem processor 216 that performs baseband/modem functions for communicating with/controlling a RAT, one or more radio units including transmitter and receiver components that are shown as RF resources 218a, 218b (e.g., in FIG. 2) , one or more of the wireless antennas 220a, 220b, and additional circuitry that may include one or more amplifiers and radios.
  • an RF resource may share a common baseband modem processor 216 (i.e., a single device that performs baseband/modem functions for all RATs on the multi-subscription multi-standby communication device) .
  • each RF resource may include the physically or logically separate baseband processors (e.g., BB1, BB2) .
  • the RF resources 218a, 218b may include transceivers associated with one or more RATs and may perform transmit/receive functions for the mobile communication device 200 on behalf of their respective RATs.
  • the RF resources 218a, 218b may include separate transmit and receive circuitry. In some embodiments, the RF resource 218b may include only receive circuitry.
  • the RF resources 218a, 218b may each be coupled to a wireless antenna (e.g., the first wireless antenna 220a and the second wireless antenna 220b) .
  • the RF resources 218a, 218b may also be coupled to the baseband modem processor 216.
  • the general purpose processor 206, memory 214, baseband processor (s) 216, and the RF resources 218a, 218b may be included in the mobile communication device 200 as a system-on-chip.
  • the first and second SIMs 204a, 204b and their corresponding interfaces 202a, 202b may be external to the system-on-chip.
  • various input and output devices may be coupled to components on the system-on-chip, such as interfaces or controllers.
  • Example user input components suitable for use in the mobile communication device 200 may include, but are not limited to, a keypad 224 and a touchscreen display 226.
  • the keypad 224, the touchscreen display 226, the 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 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 multi-subscription multi-standby communication device 200 to enable communication between them.
  • the two SIMs 204a, 204b, the baseband processor (s) 216, RF resources 218a, 218b and the antennas 220a, 220b may enable communications on two or more RATs.
  • one SIM, baseband processor and RF resource may be configured to support two different RATs.
  • more RATs may be supported on the multi-subscription multi-standby communication device 200 by adding more SIM cards, SIM interfaces, RF resources, and antennas for connecting to additional mobile networks.
  • FIG. 3 illustrates a method 300 for a method for managing a communication link of a first subscription following a tune away to a second subscription by a processor of a multi-subscription multi-standby communication according to some embodiments.
  • the method 300 may be implemented by a device processor (e.g., the general purpose processor 206, the baseband processor 216, a separate controller, and/or the like) of a multi-subscription multi-standby communication device (e.g., the multi-subscription multi-standby communication device 110, 200 in FIGS. 1 and 2) .
  • a device processor e.g., the general purpose processor 206, the baseband processor 216, a separate controller, and/or the like
  • a multi-subscription multi-standby communication device e.g., the multi-subscription multi-standby communication device 110, 200 in FIGS. 1 and 2 .
  • the device processor may return to a first subscription after performing a tune away to a second subscription. For example, during the conduct of a communication session over a first communication network (e.g., the first network 102) using the first subscription, the device processor may perform a tune away procedure to receive and/or send signals using a second subscription to and/or from a second communication network (e.g., the second network 104) . Following the performance of the tune away, the device processor may return the multi-subtraction multi-standby communication device to the frequency of the first subscription.
  • a first communication network e.g., the first network 102
  • the device processor may perform a tune away procedure to receive and/or send signals using a second subscription to and/or from a second communication network (e.g., the second network 104) .
  • the device processor may return the multi-subtraction multi-standby communication device to the frequency of the first subscription.
  • a normal connected mode e.g., RRC_Connected mode
  • a normal connected mode e.g., RRC_Connected mode
  • the device processor may reduce a scheduling request threshold (SR_TH) in block 308.
  • the scheduling request threshold may include a number of scheduling requests that the multi-subtraction multi-standby communication device may transmit to a base station of the first communication network.
  • the reduced number of permitted scheduling requests may be determined based on channel conditions between the multi-subscription multi-standby communication device and the base station of the first communication network (e.g., received signal strength, an RSSI, an RSRP, or another received signal strength and/or signal strength indication) .
  • the device processor may determine a smaller number of permitted scheduling requests when the determined channel conditions are relatively good (i.e., the better the channel conditions, the fewer the number of permitted scheduling requests) , to enable the multi-subscription multi-standby communication device to more quickly declare radio link failure and initiate a connection re-establishment procedure for the first communication link of the first subscription.
  • the reduced scheduling request threshold i.e., the reduced number of permitted scheduling requests
  • the device processor may determine a weighting factor based on the determined channel conditions, and the device processor may apply the weighting factor to adjust the determination of the reduced number of permitted scheduling requests. For example, the device processor may detect a downlink RSRP of less than or equal to -100dBm, and may determine a weighting factor of 1. As another example, the device processor may detect a downlink RSRP of between-100dBm and -80dBm, and may determine a weighting factor of 0.75. As a further example, the device processor may detect a downlink RSRP of greater than -80dBm, and may determine a weighting factor 0.5. In some embodiments, the device processor may multiply the determined weighting factor and the determined reduced number of permitted scheduling requests to adjust the determination of the reduced number of permitted scheduling requests based on the determined channel conditions. Other examples are also possible.
  • the device processor may determine whether an uplink grant is received by the multi-subscription multi-standby communication device (e.g., responsive to the one or more sent scheduling requests) .
  • the device processor may reset the scheduling request threshold (i.e., may set the scheduling request threshold to a standard scheduling request threshold or a standard number of permitted scheduling requests) in block 316.
  • the device processor may then determine whether downlink feedback is received from the base station of the first communication network in determination block 328. For example, when an uplink grant is received by the multi-subscription multi-standby communication device, the device processor may transmit at least some of the data that is queued for uplink transmission.
  • a normal connected mode e.g., RRC_Connected mode
  • the device processor may perform the operations of the method 400 described with reference to FIG. 4.
  • the device processor may again determine whether a number of scheduling requests sent by the multi-subscription multi-standby communication device is greater than or equal to the reduced permitted number of scheduling requests in determination block 310.
  • the device processor may reduce a permitted number of random access channel (RACH) requests that the multi-subscription multi-standby communication device may transmit to the first network (i.e., a RACH threshold, or RACH_TH) in block 318.
  • RACH random access channel
  • the reduced RACH threshold i.e., the reduced number of permitted random access channel requests
  • the device processor may determine a weighting factor based on the determined channel conditions, and the device processor may apply the weighting factor to adjust the determination of the reduced number of random access channel requests. For example, the device processor may detect a downlink RSRP of less than or equal to -100dBm, and may determine a weighting factor 1. As another example, the device processor may detect a downlink RSRP of between -100dBm and -80dBm, and may determine a weighting factor of 0.75. As a further example, the device processor may detect a downlink RSRP of greater than -80dBm, and may determine a weighting factor of 0.5. In some embodiments, the device processor may multiply the determined weighting factor and the determined reduced number of permitted random access channel requests in order to adjust the determination of the reduced number of permitted random access channel requests based on the determined channel conditions. Other examples are also possible.
  • the device processor may determine whether a number of random access channel requests sent by the multi-subscription multi-standby communication device is greater than or equal to the RACH threshold.
  • the device processor may send one or more random access channel requests, such as to a base station of the first communication network, in block 322.
  • the device processor may determine whether a channel is granted to the multi-subscription multi-standby communication device, such as responsive to the one or more random access channel requests.
  • the device processor may again may determine whether a number of random access channel requests sent by the multi-subscription multi-standby communication device is greater than or equal to the RACH threshold in determination block 320.
  • the device processor may reset the RACH threshold (i.e., may set the RACH threshold to a standard RACH threshold or a standard number of permitted random access channel requests) in block 326.
  • the device processor may then determine whether downlink feedback is received from the base station of the first communication network in determination block 328. For example, when a channel is granted to the multi-subscription multi-standby communication device, the device processor may transmit at least some of the data that is queued for uplink transmission.
  • the multi-subscription multi-standby communication device may determine whether feedback is sent, e.g., by the base station or another network element, in response to the data transmitted from the multi-standby multi-subscription communication device.
  • the device processor may enter a normal connected mode (e.g., RRC_Connected mode) and conduct normal communications in block 330.
  • the device processor may perform operations of the method 400 described with reference to FIG. 4.
  • the device processor may declare a radio link failure of the communication link of the first subscription in block 332, and initiate a connection re-establishment procedure for the first communication link of the first subscription in block 334.
  • the device processor may more quickly declare a radio link failure of a communication link with the first communication network following a tune away to the second communication network when the tune-away period is sufficiently long such that the multi-subscription multi-standby communication device may experience difficulties re-establishing communications over the first network.
  • the systems and methods of the various embodiments improve the management of the communication link of a first subscription following a tune away to the second subscription by the multi-subscription multi-standby communication device.
  • FIG. 4 illustrates a method 400 for managing a communication link of a first subscription following a tune away to a second subscription by a processor of a multi-subscription multi-standby communication device (e.g., the multi-subscription multi-standby communication device 110, 200 in FIGS. 1 and 2) according to some embodiments.
  • the method 400 may be implemented by a processor (e.g., the general purpose processor 206, the baseband processor 216, a separate controller, and/or the like) of the multi-subscription multi-standby communication device (i.e., a device processor) .
  • the device processor may reduce the duration of an uplink inactivity timer in block 402.
  • the communication link with the first communication network may include one or more resource bearers, and the device processor may determine a reduced duration for an uplink inactivity timer for each resource bearer with pending uplink data.
  • the device processor may subsequently measure activity or inactivity over the communication link (i.e., for each resource bearer) using the reduced timer duration (s) .
  • the duration of each uplink inactivity timer may be determined based on channel conditions, such as the better the channel conditions, the smaller the timer duration in order to enable the multi-subscription multi-standby communication device to more quickly determine a radio link failure.
  • the reduced duration of the uplink inactivity timer i.e., the reduced duration of the uplink inactivity timer (s)
  • the device processor may determine a weighting factor based on the determined channel conditions, and the device processor may apply the weighting factor to adjust the reduced duration of the uplink inactivity timer (s) .
  • the device processor may detect a downlink RSRP of less than or equal to -100dBm, and may determine a weighting factor of 1.
  • the device processor may detect a downlink RSRP of between -100dBm and -80dBm, and may determine a weighting factor of 0.75.
  • the device processor may detect a downlink RSRP of greater than -80dBm, and may determine a weighting factor of 0.5.
  • the device processor may multiply the determined weighting factor and the determined reduced uplink inactivity timer duration, to adjust the determination of the reduced uplink inactivity timer duration based on the determined channel conditions. Other examples are also possible.
  • the device processor may declare a radio link failure of the communication link of the first subscription in block 418, and initiate a connection re-establishment procedure for the first communication link of the first subscription block 420.
  • the device processor may stop the uplink inactivity timer in block 408.
  • the device processor may reduce a permitted number of data retransmissions that the multi-subscription multi-standby communication device may transmit to the first network (i.e., a permitted retransmissions threshold, or ReTX_TH) in block 410.
  • the reduced permitted retransmissions threshold i.e., the reduced number of permitted data retransmissions
  • the device processor may determine a weighting factor based on the determined channel conditions, and the device processor may apply the weighting factor to adjust the determination of the reduced number of permitted data retransmissions. For example, the device processor may detect a downlink RSRP of less than or equal to -100dBm, and may determine a weighting factor of 1. As another example, the device processor may detect a downlink RSRP of between -100dBm and -80dBm, and may determine a weighting factor of 0.75. As a further example, the device processor may detect a downlink RSRP of greater than -80dBm, and may determine a weighting factor of 0.5. In some embodiments, the device processor may multiply the determined weighting factor and the determined reduced number of permitted data retransmissions to adjust the determination of the reduced number of permitted data retransmissions based on the determined channel conditions. Other examples are also possible.
  • the device processor may determine whether downlink feedback is detected. For example, the device processor may detect downlink radio link control (DL RLC) feedback or control data feedback (e.g., an ACK) from the first network. The downlink feedback may be received by the device processor responsive to the transmission of the uplink data to the first network. In some embodiments, the device processor may determine the receipt or failure to receive the downlink feedback on a per-resource bearer basis.
  • DL RLC downlink radio link control
  • control data feedback e.g., an ACK
  • the device processor may determine the receipt or failure to receive the downlink feedback on a per-resource bearer basis.
  • the device processor may send one or more uplink data retransmissions using the first subscription in block 414.
  • the device processor may determine whether a number of sent data retransmissions is greater than or equal to the reduced permitted retransmissions threshold in determination block 416.
  • the device processor may continue to determine whether downlink feedback is detected determination block 412.
  • the device processor may declare a radio link failure in block 418, and initiate a connection re-establishment procedure for the first communication link of the first subscription block 420.
  • the device processor may reset the permitted retransmissions threshold (i.e., may set the permitted retransmissions threshold to a standard permitted retransmissions threshold or a standard number of permitted retransmissions) in block 422.
  • the device processor may then enter a normal connected mode (e.g., RRC_Connected mode) and conduct normal communications over the first subscription in block 424.
  • a normal connected mode e.g., RRC_Connected mode
  • the device processor may more quickly declare a radio link failure of a communication link with the first communication network following a tune away to the second communication network in scenarios in which the multi-subscription multi-standby communication device may receive a grant uplink resources, yet may not receive downlink feedback data.
  • the systems and methods improve the management of the communication link of a first subscription following a tune away to the second subscription by the multi-subscription multi-standby communication device.
  • the mobile communication device 500 may include a processor 502 coupled to a touchscreen controller 504 and an internal memory 506.
  • the processor 502 may be one or more multi-core integrated circuits designated for general or specific processing tasks.
  • the internal memory 506 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 504 and the processor 502 may also be coupled to a touchscreen panel 512, such as a resistive-sensing touchscreen, capacitive-sensing touchscreen, infrared sensing touchscreen, etc. Additionally, the display of the mobile communication device 500 need not have touch screen capability.
  • the mobile communication device 500 may have two or more radio signal transceivers 508 (e.g., Peanut, Bluetooth, Zigbee, Wi-Fi, RF radio) and antennae 510, for sending and receiving communications, coupled to each other and/or to the processor 502.
  • the transceivers 508 and antennae 510 may be used with the above-mentioned circuitry to implement the various wireless transmission protocol stacks and interfaces.
  • the mobile communication device 500 may include one or more cellular network wireless modem chip (s) 516 coupled to the processor and antennae 510 that enables communication via two or more cellular networks via two or more radio access technologies.
  • s cellular network wireless modem chip
  • the mobile communication device 500 may include a peripheral device connection interface 518 coupled to the processor 502.
  • the peripheral device connection interface 518 may be singularly configured to accept one type of connection, or may be 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 518 may also be coupled to a similarly configured peripheral device connection port (not shown) .
  • the mobile communication device 500 may also include speakers 514 for providing audio outputs.
  • the mobile communication device 500 may also include a housing 520, constructed of a plastic, metal, or a combination of materials, for containing all or some of the components discussed herein.
  • the mobile communication device 500 may include a power source 522 coupled to the processor 502, 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 mobile communication device 500.
  • the mobile communication device 500 may also include a physical button 524 for receiving user inputs.
  • the mobile communication device 500 may also include a power button 526 for turning the mobile communication device 500 on and off.
  • the processor 502 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 below. In some mobile communication devices, multiple processors 502 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 506 before they are accessed and loaded into the processor 502. The processor 502 may include internal memory sufficient to store the application software instructions.
  • Various embodiments may be implemented in any number of single or multi-processor systems.
  • processes are executed on a processor in short time slices so that it appears that multiple processes are running simultaneously on a single processor.
  • information pertaining to the current operating state of the process is stored in memory so the process may seamlessly resume its operations when it returns to execution on the processor.
  • This operational state data may include the process’s address space, stack space, virtual address space, register set image (e.g., program counter, stack pointer, instruction register, program status word, etc. ) , accounting information, permissions, access restrictions, and state information.
  • a process may spawn other processes, and the spawned process (i.e., a child process) may inherit some of the permissions and access restrictions (i.e., context) of the spawning process (i.e., the parent process) .
  • a process may be a heavy-weight process that includes multiple lightweight processes or threads, which are processes that share all or portions of their context (e.g., address space, stack, permissions and/or access restrictions, etc. ) with other processes/threads.
  • a single process may include multiple lightweight processes or threads that share, have access to, and/or operate within a single context (i.e., the processor’s context) .
  • 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 communication 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 blocks 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 operations 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.

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

Abstract

Des modes de réalisation concernent des systèmes et des procédés de gestion d'une liaison de communication d'un premier abonnement après un décrochage à un second abonnement. Le processeur d'un dispositif de communication multi-veille peut déterminer si une période de décrochage est égale ou supérieure à un seuil de période de décrochage lors du retour à un premier abonnement après exécution d'un décrochage à un second abonnement, et peut réduire un seuil de demande de programmation en réponse à la détermination que la période de décrochage est égale ou supérieure au seuil de la période de décrochage. Le processeur du dispositif peut réduire un seuil de demandes de canal d'accès aléatoire lorsqu'il est déterminé que le nombre de demandes de programmation envoyées est égal ou supérieur au seuil de demandes de programmation réduit, et peut déclarer une panne de liaison radio lorsqu'il est déterminé que le nombre de demandes de canal d'accès aléatoire envoyées est égal ou supérieur au seuil de demandes de canal d'accès aléatoire réduit.
PCT/CN2015/080275 2015-05-29 2015-05-29 Gestion de liaison de communication après un décrochage WO2016191939A1 (fr)

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