Apple Inc.

Anil G Naik

Ajoy K Singh

David L Biderman

Christopher M Garrido

Najeeb M Abdulrahiman

Srinivasan Vasudevan

Ming Jin

Luciano Miguel Verger

Eric A Allamanche

Patrick Miauton

Deepak Chitlur Lakshman

Venkateswara Rao Manepalli

Giri Prassad Deivasigamani

Gurtej Singh Chandok

Srinivasan Nimmala

Madhusudan Chaudhary

Prashant H Vashi

Alon Paycher

Raghuveer Mallikarjunan

Hsien-Po Shiang

Gurtej Singh G Chandok

Yaranama Venkata Ramana Dass

Arun Vijayakumari Mahasenan

Sarvesh Kumar Varatharajan

Yevgeny Bezman

Igor Shvorin

Won Soo Kim

Piyush Kumar Upadhyay

The present disclosure relates to several techniques for reducing the occurrence of data collisions, which can occur when multiple devices simultaneously transmit data in the same (frequency) channel. For example, a turnaround time in which a device switches from a receive mode of operation to a transmit mode of operation may be reduced based on the device and another device indicating that they are capable of operating with a reduced turnaround. As another example, devices may use learning-based turnaround estimation to determine a turnaround time supported by other devices and utilize the determined turnaround time, for instance, instead of a longer turnaround time. As yet another example, multiple clear channel assessments may be performed before transmitting data. For instance, a first clear channel assessment may be performed during a backoff period, and a second clear channel assessment may be performed afterwards before data is transmitted.

Systems and methods for reducing occurrence of data collisions in wireless networks

Methods and apparatus to manage communication sessions to handover between a direct connection at a secondary wireless device and a relayed connection to the secondary wireless device via a primary wireless device. A connection manager of a secondary wireless device can trigger transfer of a communication session based on measurements of performance metrics for the communication session. Upon detection of performance degradation in a local connection or a backhaul connection or both, the connection manager of the secondary wireless device can determine proximity of and/or capabilities for connections of the primary wireless device and instigate transfer of the communication session between different connection types, such as between a direct connection and a relayed connection. The transfer of the communication session can occur without user intervention or in response to input from the user without interrupting or reestablishing the communication session.

Active communication session handover between direct and relayed connections

A source device connected to a sink device over a first wireless connection. The source device identifies a frame for retransmitting a voice packet associated with a real time application from the source device to the sink device, determines that a precedent operation is scheduled for the frame, delays the precedent operation to a subsequent frame, following the retransmitting of the voice packet and scheduling a retransmission operation for retransmitting the voice packet during the frame.

Voice quality over bluetooth link by enhancing scheduler behavior for retransmission frames

This disclosure relates to inter radio access technology management for audiovisual calls. Wireless link availability and suitability for an audiovisual call may be evaluated for each of a first radio access technology and a second radio access technology. One or more wireless links on which to establish an audiovisual call may be selected based on the evaluations. The audiovisual call may be established on the selected wireless link(s). Wireless link availability and suitability for an audiovisual call may be monitored during the audiovisual call and decisions on whether to perform handover to a different wireless link and/or media duplication on multiple wireless links may be made based on the suitability for an audiovisual call of available wireless links.

Inter radio access technology management for audiovisual calls

Apparatuses, systems, and methods for user equipment (UE) devices to perform a postponement of a data service request are described. A UE may detect a data service request failure during cell reselection and postpone a resend of the data service request based on a status of the cell reselection. The status may be an indication that the UE is attempting to camp on a cell or that the UE is monitoring one or more metrics associated with cell reselection. To postpone the data service request, the UE may postpone the data service request for a specified period of time or until the cell reselection is complete. The status may be monitored on a first layer of a protocol stack and the data service request may generated by a second layer of the protocol stack. The postponement may be for a fixed or variable time period.

Postponing a resending of a data service request

A voice over Long Term Evolution (VoLTE) capable mobile device is configured to deregister from an Internet Protocol (IP) Multimedia Subsystem (IMS) network element for voice connections and use a dual network mode of operation that includes data connections via a 4G LTE/LTE-A network and voice connections via a legacy 3G or 2G network based on performance metrics a serving cell of the 4G LTE/LTE-A network. When the performance metrics indicate that voice connections may be unstable, such as when a reference signal received power (RSRP) falls below a threshold level but remains above a reselection/handover threshold level, the mobile device deregisters from the IMS network element to disable VoLTE connections from being established. The mobile device establishes the requested voice connection via a legacy 3G or 2G network instead, while established or new data connections for the mobile device continue to use the 4G LTE/LTE-A network.

Selective dual network mode for LTE devices

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San Jose, CA, United States of America

Anil G Naik