公开(公告)号：US20180310267A1

公开(公告)日：2018-10-25

申请号：US15949978

申请日：2018-04-10

Applicant: QUALCOMM Incorporated

Inventor： Chih-Hao LIU ,  Srinivas Yerramalli ,  Tamer Kadous

IPC: H04W56/00

CPC classification number: H04W56/0005 ,  H04W56/001

Abstract: Methods, systems, and devices for wireless communication are described for synchronization for wideband coverage enhancement. A user equipment (UE) may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a subframe of a frame. In one example, the PSS may be received in each of a first plurality of consecutive symbols of the subframe. In another example, the SSS may be received in each of a second plurality of consecutive symbols of the subframe, wherein the second plurality of consecutive symbols is after the first plurality of consecutive symbols within the subframe. The UE may synchronize with a base station based at least in part on the PSS and the SSS received in the subframe. Numerous other aspects are provided.

公开(公告)号：US10034283B2

公开(公告)日：2018-07-24

申请号：US14464409

申请日：2014-08-20

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Wanshi Chen ,  Naga Bhushan

IPC: H04W72/04 ,  H04L1/00 ,  H04L5/00

Abstract: Channel state information (CSI) and acknowledgement (ACK) reporting enhancements in Long Term Evolution (LTE)/LTE-Advanced (LTE-A) enabling communications over an unlicensed spectrum are disclosed. For example, ACK/NAK may include unlicensed spectrum interference information, such as WIFI interference. Additionally, in anticipation of a future downlink transmission, UEs may report WiFI interference to base stations absent a current downlink transmission. Also, CSI-RS and/or IMR resources may be staggered across subframes and/or within slots of subframes. Further, CSI reporting may include separate reports for CSI-RS resources that experience unlicensed spectrum interference and interference free CSI-RS resources. Still further, CSI reports may include a request to the base station to switch the current channel or band. Finally, inter-RAT ACK and CSI reporting may be provided on a second unlicensed spectrum band, such as a WIFI band, for a first unlicensed spectrum band, such as an LTE/LTE-A unlicensed band.

公开(公告)号：US09992800B2

公开(公告)日：2018-06-05

申请号：US15586840

申请日：2017-05-04

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Peter Gaal ,  Chirag Patel ,  Arumugam Chendamarai Kannan ,  Juan Montojo ,  Yongbin Wei

IPC: H04W16/14 ,  H04W74/08 ,  H04L5/00 ,  H04L1/00 ,  H04L1/08

CPC classification number: H04W74/0833 ,  H04L1/00 ,  H04L1/08 ,  H04L5/00 ,  H04L5/0041 ,  H04W16/14 ,  H04W74/0866

Abstract: Techniques are described for wireless communication. One method includes transmitting a sequence of deterministic variations of random access data on at least one interlace of non-contiguous frequency resources allocated to a physical random access channel (PRACH) in an unlicensed spectrum, beginning at a first time; repeating the transmitting of the sequence of deterministic variations of random access data at least once, beginning at a second time; generating at least one modification of the sequence of deterministic variations of random access data, in which the at least one modification is generated according to a modification sequence; and transmitting on the at least one interlace, beginning at a third time, the at least one modification of the sequence of deterministic variations of random access data.

公开(公告)号：US09967080B2

公开(公告)日：2018-05-08

申请号：US15151648

申请日：2016-05-11

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Srinivas Yerramalli ,  Tao Luo

IPC: H04W4/00 ,  H04L5/00 ,  H04W16/14 ,  H04W74/08 ,  H04W74/02

CPC classification number: H04L5/0091 ,  H04L5/001 ,  H04W16/14 ,  H04W74/02 ,  H04W74/0808

Abstract: Techniques for performing listen before talk (LBT) procedures in networks having multiple channels within a shared radio frequency spectrum band are provided. These techniques may include determining a contention window size for a first LBT procedure to access a first channel of a shared radio frequency spectrum band, which may then be applied as the contention window size for a second LBT procedure to access a second channel of the shared radio frequency spectrum band. The contention window size may be determined based at least in part on one or more of a service priority or a channel type for data to be transmitted using the first channel. Performing the first LBT procedure may include determining that a recipient base station has reserved the first channel and the second channel, and performing the second LBT procedure for the second channel.

公开(公告)号：US09942801B2

公开(公告)日：2018-04-10

申请号：US14968339

申请日：2015-12-14

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Siddhartha Mallik ,  Xiaoxia Zhang ,  Aleksandar Damnjanovic ,  Kiran Kumar Somasundaram

IPC: H04W28/26 ,  H04W16/14 ,  H04W72/04 ,  H04W74/08 ,  H04W72/12

CPC classification number: H04W28/26 ,  H04W16/14 ,  H04W72/0446 ,  H04W72/1215 ,  H04W74/08

Abstract: Techniques are described for wireless communication. A first method includes contending for access to a first channel of a radio frequency spectrum, and transmitting, upon winning contention for access to the first channel, a first channel reservation indication. The contending may be performed by a first node operating according to a first radio access technology. The first channel reservation indication may be understood by a second node operating according to a second radio access technology.

公开(公告)号：US09930498B2

公开(公告)日：2018-03-27

申请号：US15222745

申请日：2016-07-28

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxia Zhang ,  Srinivas Yerramalli ,  Tao Luo

IPC: H04J11/00 ,  G08C15/00 ,  H04J1/16 ,  H04L1/00 ,  H04W4/06 ,  H04W16/14 ,  H04W74/08 ,  H04W74/00 ,  H04W56/00 ,  H04W72/00

CPC classification number: H04W4/06 ,  H04W16/14 ,  H04W56/001 ,  H04W72/005 ,  H04W74/006 ,  H04W74/08

Abstract: A method and apparatus for adjusting preamble transmissions to maintain synchronization with other network entities operating in an unlicensed spectrum during wireless communications are described. The method and apparatus include accessing, by a second node, a contention-based medium currently accessed by a first node transmitting a first burst of data. The method and apparatus further include transmitting, by the second node, a second burst of data over the accessed medium, the second burst of data having an associated preamble configured not to interfere with a joint transmission portion of the first burst of data. The first and second nodes may be enhanced-multimedia broadcast multicast service (eMBMS) nodes. Moreover, the joint transmission portion of the first burst of data may include transmission of one or more multicast-broadcast single-frequency network (MBSFN) subframes.

公开(公告)号：US20180027554A1

公开(公告)日：2018-01-25

申请号：US15605707

申请日：2017-05-25

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Peter Gaal ,  Juan Montojo ,  Tao Luo ,  Wanshi Chen

IPC: H04W72/04 ,  H04W28/02 ,  H04W72/14 ,  H04L1/18 ,  H04L5/00 ,  H04W72/12

Abstract: Techniques are described for wireless communication. One method includes detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of contiguous transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size usable by the UE to contend for access to the shared radio frequency spectrum band; and transmitting an indication of the determined contention window size to the UE.

公开(公告)号：US20170353976A1

公开(公告)日：2017-12-07

申请号：US15611553

申请日：2017-06-01

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Tao Luo ,  Xiaoxia Zhang ,  Durga Prasad Malladi

IPC: H04W74/08 ,  H04L5/00 ,  H04W24/10 ,  H04W56/00 ,  H04W72/04 ,  H04W88/08 ,  H04W88/02

CPC classification number: H04W74/0833 ,  H04L1/00 ,  H04L1/0026 ,  H04L1/0027 ,  H04L5/0048 ,  H04L5/0057 ,  H04W24/10 ,  H04W56/001 ,  H04W72/0446 ,  H04W74/004 ,  H04W74/08 ,  H04W88/02 ,  H04W88/08

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive, from a base station, a downlink transmission in a radio frequency spectrum band and may identify reference resources in the downlink transmission for computing a channel state information (CSI) report. The UE may generate the CSI report based at least in part on the identified reference resources and transmit, in the radio frequency spectrum band, the CSI report in a random access request message to the base station. The base station may receive the request message and identify CSI associated with the band based at least in part on the CSI report included in the random access request message. The base station may transmit, to the UE, a random access response message based at least in part on the identified CSI in the radio frequency spectrum band.

公开(公告)号：US09787569B2

公开(公告)日：2017-10-10

申请号：US14968563

申请日：2015-12-14

Applicant: QUALCOMM Incorporated

Inventor： Kiran Kumar Somasundaram ,  Durga Prasad Malladi ,  Tao Luo ,  Aleksandar Damnjanovic ,  Yongbin Wei ,  Qingsi Wang ,  Srinivas Yerramalli

IPC: H04W4/00 ,  H04L12/26 ,  H04W24/08 ,  H04L1/00 ,  H04W16/14 ,  H04B17/318 ,  H04W88/06 ,  H04W88/10 ,  H04W84/12

CPC classification number: H04L43/16 ,  H04B17/318 ,  H04L1/0036 ,  H04W16/14 ,  H04W24/08 ,  H04W74/08 ,  H04W84/12 ,  H04W88/06 ,  H04W88/10

Abstract: The disclosure provides for a method of interference detection using adaptive energy detection in unlicensed spectrum. The method can include a first modem operating according to a first radio access technology (RAT) receiving a message from a network entity operating according to the first RAT. The first modem sends a detected energy level value to a second modem that is using a second RAT, where the detected energy level value is based at least on the measured energy level of the received message. The second modem adjusts an energy detection threshold based on the detected energy level value received from the first modem. In an aspect, the first modem receives messages from a plurality of network entities operating according to the first RAT, where the detected energy level value is determined based on measured energy levels of the plurality of received messages.

公开(公告)号：US20170289993A1

公开(公告)日：2017-10-05

申请号：US15471524

申请日：2017-03-28

Applicant: QUALCOMM Incorporated

Inventor： Srinivas Yerramalli ,  Wanshi Chen ,  Peter Gaal ,  Juan Montojo

IPC: H04W72/04 ,  H04L1/18 ,  H04L5/00 ,  H04W72/12

CPC classification number: H04W72/0413 ,  H04L1/1864 ,  H04L5/001 ,  H04L5/0041 ,  H04L5/0053 ,  H04L5/0055 ,  H04L5/0057 ,  H04L5/0094 ,  H04W16/14 ,  H04W24/10 ,  H04W72/042 ,  H04W72/0446 ,  H04W72/1231 ,  H04W72/1284

Abstract: Uplink control channel transmission in a shared radio frequency spectrum band may be transmitted using different uplink resources UCI based on a format of uplink control information (UCI) to be transmitted in the uplink control channel transmission. Different time resources, frequency resources, or combinations thereof, for the transmission of UCI by a UE may be provided by a base station and selected by the UE based on a UCI format. The resources to be used for UCI transmission may semi-statically configured, or dynamically indicated to a UE. Uplink transmissions may be configured in interlaces of frequency resources, with each interlace having one or more segments, and a base station may configure different segments for transmission of different format UCI. In some cases, different subframes, or different component carriers, may be configured for different formats of UCI.