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公开(公告)号：US20210029740A1
公开(公告)日：2021-01-28
申请号：US16910830
申请日：2020-06-24
Applicant: QUALCOMM Incorporated
Inventor： Srinivas YERRAMALLI , Arumugam CHENDAMARAI KANNAN , Vinay CHANDE , Xiaoxia ZHANG , Tao LUO , Sungwoo PARK , Wooseok NAM , Jing SUN , Kaushik CHAKRABORTY , Zhifei FAN , Mostafa KHOSHNEVISAN
Abstract: This disclosure provides systems, methods, and apparatuses for a beam-based channel access countdown procedure. In one aspect, a channel sensing beam may be permitted to include one or more transmit beams and, thus, may differ from a transmit beam that is to be used for a transmission. As such, defining a manner in which a channel access countdown procedure is performed is desirable. Some aspects described herein provide techniques and apparatus for a beam-based channel access countdown procedure. In some aspects, the systems, methods, and apparatuses described herein provide a beam-based channel access countdown procedure that allows a single channel sensing beam, including multiple transmit beams, to be utilized in association with determining channel availability for the multiple transmit beams, thereby improving performance of beam-based directional transmissions.
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公开(公告)号：US20210021450A1
公开(公告)日：2021-01-21
申请号：US16927971
申请日：2020-07-13
Applicant: QUALCOMM Incorporated
Inventor： Xiaoxia ZHANG , Jing SUN , Tao LUO , Srinivas YERRAMALLI , Zhifei FAN , Mostafa KHOSHNEVISAN , Wanshi CHEN , Juan MONTOJO , Peter GAAL , Arumugam CHENDAMARAI KANNAN
Abstract: Aspects relate to implementing multiplexing with a single carrier waveform. In some examples, intra-symbol multiplexing of data and other information on a single carrier symbol may be implemented utilizing pre-discrete Fourier transform (DFT) multiplexing. In addition, time domain rate-matching may be performed on the data to rate-match the data around the other information based on a number of usable samples in the time domain within the symbol for the data.
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公开(公告)号：US20200322908A1
公开(公告)日：2020-10-08
申请号：US16836543
申请日：2020-03-31
Applicant: QUALCOMM Incorporated
Inventor： Rajat PRAKASH , Xiaoxia ZHANG , Srinivas YERRAMALLI , Seyed Ali Akbar FAKOORIAN , Vinay JOSEPH
IPC: H04W56/00
Abstract: A wireless communication system is provided allowing a base station to indicate RTT compensation for UEs to adjust their local time clocks to correct propagation delay timing errors and synchronize with the global clock of a base station. A base station sends a downlink transmission including timing information to a UE and receives an uplink transmission from the UE after the downlink transmission. The base station determines a RTT compensation associated with the timing information based on a RTT between the downlink transmission and the uplink transmission. The base station then transmits the RTT compensation to the UE. UEs are thus allowed to synchronize at a high precision with the time clock of the base station. UEs may be configured with different resolutions or granularities in timing correction so that certain UEs can achieve high precision timing correction while other UEs can adjust their time clocks with less precision.
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公开(公告)号：US20200213888A1
公开(公告)日：2020-07-02
申请号：US16716082
申请日：2019-12-16
Applicant: QUALCOMM Incorporated
Inventor： Chih-Hao LIU , Srinivas YERRAMALLI , Tamer KADOUS
Abstract: Various features related to eMTC-U deployment are described. In an aspect of the disclosure, an apparatus (e.g., a base station) maybe configured to select a subset of non-anchor channels from a set of available non-anchor channels, where the subset of non-anchor channels may correspond to a bandwidth within an unlicensed band. The apparatus maybe further configured to transmit information indicating the subset of non-anchor channels via an anchor channel. In some configurations, the subset of non-anchor channels maybe selected based on channel measurements performed by the base station or a UE. In one aspect, a UE may receive, from a base station via an anchor channel, information indicating a subset of non-anchor channels selected from a set of available non-anchor channels. The UE may transmit data on one or more non-anchor channel of the subset of non-anchor channels.
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公开(公告)号：US20200170019A1
公开(公告)日：2020-05-28
申请号：US16695017
申请日：2019-11-25
Applicant: QUALCOMM Incorporated
Inventor： Vinay JOSEPH , Srinivas YERRAMALLI , Rajat PRAKASH , Aleksandar DAMNJANOVIC , Prashanth HANDE
Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive information identifying a reserved resource allocation, wherein the reserved resource allocation is associated with a reserved resource; receive information identifying another resource allocation, wherein the other resource allocation overlaps with the reserved resource allocation at an overlapped portion; and selectively perform a communication using the overlapped portion for the reserved resource allocation or the other resource allocation based at least in part on at least one of: respective traffic types of the reserved resource allocation and the other resource allocation, or respective priority levels associated with the reserved resource allocation and the other resource allocation. Numerous other aspects are provided.
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Patent Agency Ranking
公开(公告)号：US20190342045A1
公开(公告)日：2019-11-07
申请号：US16400822
申请日：2019-05-01
Applicant: QUALCOMM Incorporated
Inventor： Andrei Dragos RADULESCU , Srinivas YERRAMALLI , Xiaoxia ZHANG , Aleksandar DAMNJANOVIC , Tamer KADOUS , Jing SUN , Yongbin WEI
Abstract: Scheduling around frame based equipment (FBE) idle periods reduces the flexibility of scheduling and partitioning. This leads to a latency caused by waiting for the next downlink scheduling opportunity and skipping over unused uplink scheduling slots. According to certain aspects, to reduce overhead caused by idle time and ensure full downlink scheduling, a base station (BS) alternates between idle periods and channel occupancy time every fixed frame period with one or more other synchronized BSs, between components carriers of the BS, or both. Thus, a BS can always schedule downlink on a carrier during an idle period scheduled for a different BS and/or a different carrier.
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公开(公告)号：US20190327047A1
公开(公告)日：2019-10-24
申请号：US16385929
申请日：2019-04-16
Applicant: QUALCOMM Incorporated
Inventor： Chih-Hao LIU , Srinivas YERRAMALLI , Tamer KADOUS
Abstract: A method and a system for narrowband wireless communication is disclosed. The base station constructs a DRS comprising a first set of contiguous NPSS subframes followed by a second set of contiguous repeating NSSS subframes. The DRS may further comprise a third set of NSSS subframes followed by a fourth set of NPSS subframes. The base station may apply a cover code to symbols of the NPSS subframes. The base station transmits the NPSS/NSSS subframes as part of a DRS subframe on an anchor channel.
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公开(公告)号：US20190181995A1
公开(公告)日：2019-06-13
申请号：US16209538
申请日：2018-12-04
Applicant: QUALCOMM Incorporated
Inventor： Chih-Hao LIU , Srinivas YERRAMALLI , Tamer KADOUS
Abstract: Techniques and apparatuses described herein facilitate narrowband communication within the unlicensed frequency spectrum by simultaneously transmitting (e.g., in adjacent channels) a plurality of anchor channels. For example, a base station may simultaneously transmit at least three anchor channels of 180 kHz each so that the 500 kHz minimum bandwidth requirement is satisfied. Furthermore, the techniques and apparatuses described herein provide discovery reference signal (DRS) structures to cause the different types of DRS to be repeated and/or transmitted on different anchor channels, which improves frequency diversity. Also, a synchronization signal of the anchor channels may be used to indicate a configuration of the anchor channels. Thus, synchronization in the NB-IoT-unlicensed (NB-IoT-u) spectrum is enabled, and efficiency is improved over synchronization using a single anchor channel.
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419.发明申请公开(公告)号：US20190132817A1
公开(公告)日：2019-05-02
申请号：US16167417
申请日：2018-10-22
Applicant: QUALCOMM Incorporated
Inventor： Chih-Hao LIU , Srinivas YERRAMALLI , Tamer KADOUS
Abstract: A DRX/eDRX cycle may include a single PFW located in one of the non-anchor hopping frames and used to transmit a paging message. When the LBT procedure fails for the non-anchor hopping frame in which the PFW is located, transmission of the paging message may be delayed. Postponing the transmission of the paging message until a subsequent DRX/eDRX cycle be detrimental since the UE may not receive the change in system information at the next modification boundary. Thus, there is a need for paging mechanism the increases the chance of a UE receiving a paging message during a DRX/eDRX cycle. The present disclosure provides a paging mechanism that uses a PSFW with a PFW in each non-anchor hopping frame within a DRX/eDRX cycle. Hence, the chance of a UE receiving a paging message and hence the change in system information may be increased.
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公开(公告)号：US20190090256A1
公开(公告)日：2019-03-21
申请号：US16134534
申请日：2018-09-18
Applicant: QUALCOMM Incorporated
Inventor： Chih-Hao LIU , Srinivas YERRAMALLI , Tamer KADOUS
Abstract: In an embodiment, an AP executes a CCA protocol to determine whether to begin transmission within a DMTC window of a radio frame having first and second blocks of subframes. The AP transmits a multi-subframe DRS within the DRS subframes that is scrambled in accordance with a CSI-RS scrambling rule that determines how the second DRS subframe is to be scrambled based on whether the first DRS subframe is included among the first block of subframes or the second block of subframes. At least one UE monitors the DMTC window, and descrambles the CSI-RSs in the multi-DRS subframe based on a CSI-RS descrambling rule that determines how the second DRS subframe is to be descrambled based on whether the first DRS subframe is included among the first block of subframes or the second block of subframes.
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