Yuan Xing Liu

8526946, Sep 3, 2013

Jul 10, 2012

13/545515

Giridhar Pattaswamy - Karnataka, IN
Navin K. Karra - Bracknell, GB
Abhishek Pandit - Wokingham, GB
Stephen J Richards - Maidenhead, GB
Yuan Liu - Holmdel NJ, US
Yaxin Cao - Laurence Harbor NJ, US
Jun Lin - Cupertino CA, US

Broadcom Corporation - Irvine CA

H04W 4/00

4554351

Systems and methods are presented to support operation of a multiple subscriber identity module (SIM) device. A first SIM may perform a data transfer or voice call. During the first SIM's data transfer or voice call, transition times are identified to transition communication resources to a second SIM for use in performing a registration update communication with a network controller that supports the second SIM. The registration update communication may include a periodic location update, a periodic routing update, or a periodic tracking update. The multiple SIM device may identify the transition time by obtaining periodic registration timing information from the network controller, configuring a periodic registration timer based on the periodic registration timing information, and setting the transition time as an expiration time of the periodic registration timer.

20110117909, May 19, 2011

Oct 8, 2010

12/901322

Yaxin Cao - Lauence Harbor NJ, US
Yuan Liu - Holmdel NJ, US
Zhijun Gong - Holmdel NJ, US
Yongqian Wang - East Brunswick NJ, US
Xiaoxin Qiu - Basking Ridge NJ, US
Stephen Richards - Maidenhead, GB

H04W 24/00

455423

A multiple-subscriber identity module (multi-SIM) multi-standby communication device comprises a single radio resource unit shared by a plurality of virtual modems (VMs), each uniquely associated with a single one of a plurality of SIM cards. The access to radio resources in the single radio resource unit is controlled via a virtual modem controller (VMC). The VMC collects performance metrics such as requested service type and signal quality associated with each of the VMs. A VM is selected based on the collected performance metrics to perform a requested service. A serving VM is switched among the VMs based on the collected performance metrics. VM capabilities are dynamically configured based on the collected performance metrics. According to the collected performance metrics such as associated navigation information and requested service type, one or more VMs may be turned on or off, and certain VM capabilities may be enabled or disabled to save resources.

20110117944, May 19, 2011

Jun 16, 2010

12/816835

Yaxin Cao - Laurence Harbor NJ, US
Xiaoxin Qiu - Basking Ridge NJ, US
Yuan Liu - Holmdel NJ, US
Zhijun Gong - Iselin NJ, US
Yongqian Wang - East Brunswick NJ, US
Stephen Richards - Maidenhead, GB

H04W 72/04

455509

A multiple-subscriber identity module (multi-SIM) multi-standby communication device comprises a single radio resource unit shared by a plurality of virtual modems (VMs), each uniquely associated with a single one of a plurality of SIM cards. The access to radio resources in the single radio resource unit is controlled for each VM task via a virtual modem controller (VMC). Upon receiving requests for tasks to access radio resources in the single radio resource unit, the VMC arbitrates the access based on task priority information, current activities associated with one or more of the plurality of VMs, and the radio resources available in the single radio resource unit. The access may be immediately accepted, accepted with a delay or rejected. With an immediate access, current activities may be suspended and then resumed once radio resources become available. With a delayed access, the VMC determines what time instants the access may be accepted.

20110117963, May 19, 2011

Jun 18, 2010

12/819014

Yongqian Wang - East Brunswick NJ, US
Xiaoxin Qiu - Bridgewater NJ, US
Yuan Liu - Holmdel NJ, US
Yaxin Cao - Laurence Harbor NJ, US
Zhijun Gong - Iselin NJ, US
Stephen Richards - Maidenhead, GB

H04B 1/38

455558

A multiple-subscriber identity module (multi-SIM) multi-standby communication device comprises a single radio resource unit shared by a plurality of virtual modems (VMs). A first VM in an active state monitors its own associated cells and cells associated with remaining VMs in a suspended state. The active VM measures signal strength on available cells to track cell information such as cell quality and cell timing information for associated cells for the first active VM and for the remaining suspended VMs. When the suspended VMs are resumed, the single radio resource unit is synchronized to corresponding serving cells in an order determined based on the tracked cell timing information. With a synchronized serving cell, a suspended VM may bypass cell selection or reselection and directly camp on its serving cell. Otherwise, the suspended VM performs a cell selection or reselection selectively based on tracked cell information for a cell to camp on.

20110117965, May 19, 2011

Jun 23, 2010

12/821673

Zhijun Gong - Iselin NJ, US
Xiaoxin Qiu - Bridgewater NJ, US
Yuan Liu - Holmdel NJ, US
Yaxin Cao - Laurence Harbor NJ, US
Yongqian Wang - East Brunswick NJ, US
Stephen Richards - Maidenhead, GB

H04W 72/00

455558

A multiple-subscriber identity module (multi-SIM) multi-standby communication device comprises a single operating system (OS) and a single radio resource unit that is shared by multiple virtual modems (VMs) within a virtual modem framework (VMF). The OS maps VM tasks of the multiple VM to OS resource spaces according to corresponding VM IDs. The single OS may run the mapped VM tasks utilizing OS resources in the OS resource spaces. VM ID information is embedded in global variables and/or static variables that are utilized in the single OS to access OS resources. The OS may run VM tasks utilizing OS resources in OS resource spaces identified by corresponding VM IDs. The OS may re-use OS resources for VM tasks of different VMs, when needed, without duplicating the OS resources. VM tasks are scheduled to run on the single OS according to task priorities, which are determined based on corresponding VM environment.

20130148574, Jun 13, 2013

May 17, 2012

13/474006

Yuan Liu - Holmdel NJ, US
Sethuraman Gurumoorthy - Piscataway NJ, US
Yaxin Cao - Laurance Harbor NJ, US
Giridhar Pattaswamy - Bracknell, GB
Navin K. Karra - Bracknell, GB
Abhishek Pandit - Wokingham, GB
Stephen J. Richards - Maidenhead, GB

BROADCOM CORPORATION - Irvine CA

H04W 28/02

370328

An acknowledgement technique reduces packet-switched communication delays. The technique may be implemented in a mobile communication device with multiple SIMs. The technique facilitates enhanced communication capability for the mobile communication device. In one implementation, the technique helps reduce delays caused by switching between packet-switched and circuit-switched communications. Specifically, in one aspect, the technique reduces delays caused by exponential backoff that may occur during suspension of a packet-switched communication.

20130150013, Jun 13, 2013

Jul 11, 2012

13/546515

Yuan Liu - Holmdel NJ, US
Jun Lin - Cupertino CA, US
Yaxin Cao - Laurence Harbor NJ, US
Sethuraman Gurumoorthy - Piscataway NJ, US
Tong Chen - Cliffwood NJ, US
Rami Mehio - San Diego CA, US
Jin-Sheng Su - San Diego CA, US
Arun Visvanath - San Diego CA, US

Broadcom Corporation - Irvine CA

H04W 4/00

455418

Systems and methods are presented to support operation of a multiple subscriber identity module (SIM) device. A timing conflict may exist when a scheduled high priority communication of a first SIM overlaps with a scheduled paging monitoring activity for a second SIM. The multiple SIM device may preempt transitioning communication resources to the second SIM when the first SIM executes high priority communications. Or, the multiple SIM device may execute a rescheduling action to resolve the timing conflict. The high priority communication of the first SIM may be rescheduled. Alternatively, normal priority paging monitoring actions may be rescheduled to resolve the timing conflict.

20130150032, Jun 13, 2013

May 22, 2012

13/477691

GIRIDHAR PATTASWAMY - Bracknell, GB
NAVIN K. KARRA - Bracknell, GB
ABHISHEK PANDIT - Wokingham, GB
STEPHEN J. RICHARDS - Maidenhead, GB
YONGQIAN WANG - East Brunswick NJ, US
XIAOXIN QIU - Basking Ridge NJ, US
YUAN LIU - Holmdel NJ, US
ZHIJUN GONG - Holmdel NJ, US
YAXIN CAO - Laurance Harbor NJ, US

BROADCOM CORPORATION - Irvine CA

H04W 24/00
H04W 88/06
H04W 36/14

455434, 4555521

User equipment includes techniques that may improve operation by selectively controlling access to particular radio access technologies (RATs) for the user equipment while it is operating in certain modes, such as idle mode. Once the user equipment is in a connected mode, and operating with significant uplink and\or downlink traffic activity, inter-RAT procedures can provide the benefits of access to multiple RATs. This technique is useful in many different environments, such as an environment that is predominantly 2G or 3G with 4G hot spot coverage. This technique may also be useful for providing enhanced operations in 2G/3G capable dual SIM user equipment running in a camped mode or other modes. The technique is not limited to 2G/3G/4G or any other particular standards, but may apply to any standards in a sequence of evolving or incrementally improving standards.