Qualcomm Incorporated

Qin Xue Frantti

Osama Lotfallah

Reza Shahidi

Flora Pui San Chan

Bhupesh Manoharlal Umatt

Xinning Shen

Arvind Vardarajan Santhanam

Qingxin Chen

Carlos Marcelo Dias Pazos

Cheol Hee Park

Vikram Singh

Abhishek Bhatnagar

Subashini Krishnamurthy

Shivank Nayak

Cherng-Shung Hsu

Uttam Pattanayak

Rishav Rej

Adam Hebein

Brian A'hearn

Gadigeppa Malagund

Manisha Priyadarshini

Sony Akkarakaran

Kuo-Chun Lee

Shailesh Maheshwari

Daniel Amerga

Jun Hu

Bhaskara Viswanadham Batchu

Francis Ming-Meng Ngai

Krishna Chaitanya Mukkera

Yong Xie

Hemanth Kumar Rayapati

Sandeep Ramannavar

Rohit Joshi

Ejazahmed Yergudi

A UE in cellular communication system may be equipped with multiple User Services Identity Modules (USIMs) to support multiple service subscriptions. The UE having multiple service subscriptions may obtain services from one or more wireless networks with each of the subscriptions. When the UE having multiple service subscriptions needs to make an emergency call, the UE may identify and determine a service subscription to make the emergency call, so that the emergency call can be successfully made. The UE may be implemented with a communication processor (modem) and an application processor (AP). Some information that is useful to identify a service subscription more suitable for the emergency call may be available only at the communication processor. Enhanced techniques for identifying and determining a service subscription to make the emergency call from the multiple service subscriptions through interaction between the communication processor and the application processor are disclosed.

Techniques for managing subscription identification for emergency call

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may establish, using a first subscription of the UE, a first communication connection associated with a first service. The UE may establish, using a second subscription of the UE, a second communication connection associated with a second service. The UE may operate in a dual subscriber identity module (SIM) dual active (DSDA) mode based at least in part on establishing the first communication connection and establishing the second communication connection. The UE may perform an action to maintain concurrent services, including the first service and the second service, while operating in the DSDA mode. Numerous other aspects are described.

Maintaining concurrent services in a dual active mode

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect that a first subscription, of a plurality of subscriptions associated with the UE, is associated with an active service on a first cellular network. The UE may search, for a second subscription of the plurality of subscriptions, for radio access technologies (RATs) and frequency bands that are compatible with a dual active mode of the UE. In some aspects, the UE may detect that the active service on the first cellular network has ended. Accordingly, the UE may search, for the second subscription, for RATs and frequency bands that are compatible with the dual active mode of the UE and for RATs and frequency bands that are incompatible with the dual active mode, before expiry of a timer associated with a power saving state. Numerous other aspects are described.

Radio access technology searching in dual active mode

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect, while operating in an out-of-service (OOS) mode associated with a first network, that a second network satisfies one or more switching criteria. The UE may increase a time duration associated with a periodic network acquisition scan associated with the first network based at least in part on detecting that the second network satisfies the one or more switching criteria. The UE may switch, while operating in the OOS mode, from using the first network for connectivity to using the second network for connectivity based at least in part on detecting that the second network satisfies the one or more switching criteria. Numerous other aspects are described.

Efficient network acquisition scans

Some aspects described herein relate to determining to fallback from a first radio access technology (RAT) to a second RAT to perform an emergency call, and deprioritizing, based on the determining to fallback, access to the first RAT to continue to use the second RAT for at least a period of time after the emergency call.

Techniques for radio access technology (RAT) fallback in wireless communications

Various embodiments implemented on a mobile communication device leverage the availability of multiple RATs to receive service from a combination of RATs that avoids the potential for inter-RAT coexistence interference. A mobile communication device processor may determine whether there is a likelihood of inter-RAT coexistence interference between a first RAT and a second RAT. In response to determining that there is a likelihood of interference occurring between the first RAT and the second RAT, the device processor may attempt to receive service with the first RAT and a third RAT that will not interfere with the first RAT. The device processor may monitor conditions to recognize when the likelihood of interference no longer exists between the first RAT and the second RAT, and reestablish service with the second RAT when that happens. Thus, the device processor may ensure that service is only acquired with non-interfering RATs.

Avoidance of interference during simultaneous multi-active technologies in global mode

Methods, devices, and systems embodiments enable management of service preemption of at least one of a plurality of subscriptions that utilize a plurality of radio-frequency (RF) chains on a multi-Subscriber-Identity-Module, multi-active communication device in a manner that can accommodate a variety of different RF hardware components and configurations. Various embodiments provide methods implemented by a processor to manage service preemption. In response to detecting that a service of a second subscription initiated on a first RF chain is or will preempt a service of a first subscription that is also serviced by the first RF chain, the processor may determine whether there is a similar service on a second RF chain that may be used as a substitute for the first subscription's preempted service and, when available, the processor may configure the first subscription to begin utilizing the substitute service until the first RF chain is available.

Wireless system selection factoring RF resource availability in dual access phones

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San Diego, CA, United States of America

Qin Xue Frantti