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公开(公告)号：US20200304282A1
公开(公告)日：2020-09-24
申请号：US16892901
申请日：2020-06-04
申请人： Apple Inc.
发明人： Tarik Tabet , Farouk Belghoul , S. Aon Mujtaba , Dawei Zhang
摘要： This disclosure relates to using a dedicated reference subframes in a cellular communication system. According to one embodiment, a base station may transmit reference signals in a dedicated synchronization and measurement reference subframe. Neighboring base stations may also transmit reference signals in dedicated reference subframes in a temporally coordinated (synchronized) manner. The reference signals transmitted be each base station may be orthogonal with the reference signals transmitted by each neighboring base station. The reference subframes may be transmitted periodically, and data subframes may be transmitted between reference subframes. Some or all of the data subframes may not include cell-specific reference symbols, as their function may be unnecessary given the use of the dedicated reference subframes.
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公开(公告)号：US10772015B2
公开(公告)日：2020-09-08
申请号：US16037732
申请日：2018-07-17
申请人： Apple Inc.
发明人： Tarik Tabet , Farouk Belghoul , Samy Khay-Ibbat , Sarma V. Vangala , Rafael L. Rivera-Barreto , David Boettger , Awais M. Hussain , Syed Aon Mujtaba
IPC分类号： H04W36/00 , H04B17/336 , H04B17/382
摘要： This disclosure relates to techniques for a link budget limited UE to improve communications performance with a cellular network. The UE may perform signal to interference noise ratio (SINR) measurements and use these measurements to adjust a received signal power value that is provided to the cellular network as a received signal power measurement. The UE may generate the received signal power value based at least in part on the SINR measurement in order to reduce the likelihood of handover when the UE has good SINR but poor received signal power. The UE may also provide preferred configuration information to the base station which enhances the performance of the UE when link budget limited. The configuration information may specify one or more parameter values designed to provide improved performance for a link budget limited device.
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公开(公告)号：US20200245119A1
公开(公告)日：2020-07-30
申请号：US16850164
申请日：2020-04-16
申请人： Apple Inc.
发明人： Tarik Tabet , Lydi Smaini , Ronald W. Dimpflmaier , Matthias Sauer , Venkateswara Rao Manepalli
摘要： This disclosure relates to techniques for supporting narrowband device-to-device wireless communication, including possible techniques for performing discovery in an off grid radio system. A wireless device may obtain synchronization with a peer-to-peer communication group. The wireless device may determine the location of the wireless device within the peer-to-peer communication group based at least in part on signal strength of a synchronization signal used to obtain the synchronization. The wireless device may perform peer-to-peer discovery in the peer-to-peer communication group, such that time and frequency resources used by the wireless device to perform the peer-to-peer discovery are determined based at least in part on the location of the first wireless device within the peer-to-peer communication group.
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公开(公告)号：US10728937B2
公开(公告)日：2020-07-28
申请号：US15863701
申请日：2018-01-05
申请人： Apple Inc.
发明人： Tarik Tabet , Lydi Smaini , Venkateswara Rao Manepalli , Matthias Sauer , Ronald W. Dimpflmaier , Farouk Belghoul , Christian W. Mucke
摘要： This disclosure relates to techniques for supporting narrowband device-to-device (D2D) wireless communication, including possible techniques for providing synchronization and master information block signals in an off grid radio system. A wireless device may provide D2D synchronization signals for a D2D communication group. The D2D synchronization signals may be provided using multiple frequency channels. The D2D synchronization signals may be provided on each respective frequency channel of the frequency channels during a respective portion of a D2D synchronization signal cycle in a sequential manner.
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公开(公告)号：US20200187269A1
公开(公告)日：2020-06-11
申请号：US16791157
申请日：2020-02-14
申请人： Apple Inc.
发明人： Tarik Tabet , Youngjae Kim , Syed Aon Mujtaba
摘要： Enhanced random access procedures for link-budget-limited user equipment (UE) devices are disclosed. A user equipment device may transmit a first message containing a Physical Random Access Channel (PRACH). The PRACH contains instances of a Zadoff-Chu sequence, and may be transmitted repeatedly as part of a single random attempt, to facilitate correlation data combining at the base station. The available Zadoff-Chu sequences may be partitioned among a plurality of sets, each set being associated with a respective Doppler shift range (or frequency hop pattern or time repetition pattern). A UE device may signal Doppler shift (or other information) to the base station by selection of one of the sets. The first PRACH transmission and the following PRACH transmission may occur in consecutive subframes. A UE device may select from a special set of Zadoff-Chu sequences (different from a conventional set of sequences), to signal its status as a link-budget-limited device.
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16.发明授权公开(公告)号：US10666471B2
公开(公告)日：2020-05-26
申请号：US16132697
申请日：2018-09-17
申请人： Apple Inc.
发明人： Lydi Smaini , Tarik Tabet , Ronald W. Dimpflmaier
摘要： Systems, methods, and devices are provided for reducing and/or eliminating impact of inter-carrier interference on wireless signals transmitted and received via off-grid radio communications (e.g., Device-to-Device (D2D) communication). The method may include using circuitry to generate a plurality of subcarriers associated with a data signal, such that the plurality of subcarriers transmit the data signal along a narrowband transmission channel. The method may involve using the circuitry to remove a null subcarrier of the plurality of subcarriers that is located at a direct current (DC) frequency. The method may also involve generating an asymmetrical frequency spectrum for a portion of the plurality of subcarriers centered about the removed null subcarrier. The method may also include transmitting the plurality of subcarriers to another electronic device via D2D communication.
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公开(公告)号：US10595319B2
公开(公告)日：2020-03-17
申请号：US15571577
申请日：2016-11-05
申请人： Apple Inc.
发明人： Tarik Tabet , Haijing Hu , Dawei Zhang , Yuchul Kim
摘要： This disclosure relates to techniques for supporting asymmetric uplink and downlink bandwidth allocations for a wireless device, and for dynamically modifying the bandwidth allocations for a wireless device, in a wireless communication system. A cellular communication link may be established between a base station and a wireless device. The base station may determine an uplink bandwidth allocation and a downlink bandwidth allocation for the wireless device. The uplink bandwidth allocation and the downlink bandwidth allocation may be selected based on different criteria and may include different amounts of bandwidth. Indications of the uplink bandwidth allocation and the downlink bandwidth allocation may be provided to the wireless device. The base station and wireless device may communicate according to the uplink bandwidth allocation and the downlink bandwidth allocation.
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18.发明授权公开(公告)号：US10575315B2
公开(公告)日：2020-02-25
申请号：US14503204
申请日：2014-09-30
申请人： APPLE INC.
发明人： Sarma V. Vangala , Swaminathan Balakrishnan , Tarik Tabet , Samy Khay-Ibbat , Rafael L. Rivera-Barreto , Dawei Zhang , Sree Ram Kodali
摘要： A system, devices and methods for providing input from a user equipment (UE) for the selection of a carrier channel combination for use in carrier aggregation. The exemplary system includes a UE configured to perform carrier aggregation, the UE storing a radio frequency (RF) calibration table including a plurality of transmission related requirements specific to the UE, the UE configured to generate priority data for each carrier channel combination supported for use in carrier aggregation based upon the RF calibration table and a network component receiving the priority data and an indication from the UE, the network component configured to select a carrier channel combination for use in carrier aggregation based upon the priority data, the network component transmitting carrier aggregation configuration data including the selected carrier channel combination to the UE.
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公开(公告)号：US10560934B2
公开(公告)日：2020-02-11
申请号：US15479997
申请日：2017-04-05
申请人： Apple Inc.
发明人： Vinay Majjigi , Tarik Tabet , Dawei Zhang
摘要： This disclosure relates to TTI bundling for downlink communication. According to one embodiment, a base station and a wireless device may establish a wireless communication link. The base station may determine to enable TTI bundling for downlink communication for at least one carrier of the wireless communication link. The base station may provide an indication to the wireless device to enable TTI bundling for downlink communication for the determined carrier(s) of the wireless communication link. The base station may subsequently transmit TTI bundle downlink communications to the wireless device via the determined carrier(s).
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公开(公告)号：US10517042B2
公开(公告)日：2019-12-24
申请号：US15380175
申请日：2016-12-15
申请人： Apple Inc.
发明人： Farouk Belghoul , Rafael L. Rivera-Barreto , Krisztian Kiss , Rohan C. Malthankar , Tarik Tabet , Cesar Perez
摘要： Distributing indications of emergency messages via Wi-Fi. A cellular device may temporarily disable its cellular modem. The cellular device may receive an indication over Wi-Fi that an emergency message has been broadcast. In response, the cellular device may activate its cellular modem and retrieve the emergency message via a cellular network.
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