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公开(公告)号：US11700044B2
公开(公告)日：2023-07-11
申请号：US17094645
申请日：2020-11-10
Applicant: NXP USA, Inc.
Inventor： Young Hoon Kwon , Liwen Chu , Sudhir Srinivasa , Hongyuan Zhang , Huiling Lou
IPC: H04B7/06 , H04W72/04 , H04B7/0413 , H04W88/06 , H04W88/02
CPC classification number: H04B7/0626 , H04B7/0413 , H04W72/04 , H04W88/02 , H04W88/06
Abstract: Various embodiments relate to a system and method for joint sounding by a client with a master access point (AP) and a slave (AP), including: receiving a message from the master AP; applying network allocation vector (NAV) rules to update a NAV values, wherein the received message is treated as an intra-basic service set (BSS) message when the transmit address (TA) of the received message has a prespecified value; receiving a first trigger frame; and transmitting a first channel state information (CSI) to the master AP when the channel is idle based upon the updated NAV value in response to the trigger frame.
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公开(公告)号：US11638238B2
公开(公告)日：2023-04-25
申请号：US17139656
申请日：2020-12-31
Applicant: NXP USA, Inc.
Inventor： Liwen Chu , Rui Cao , Sudhir Srinivasa , Hongyuan Zhang , Young Hoon Kwon , Hui-Ling Lou
Abstract: Embodiments of a method and an apparatus for multi-link data transmission are disclosed. In an embodiment, a method for communications involves at a first device, transmitting, to a second device, a trigger frame that solicits at least one Physical layer Protocol Data Unit (PPDU) for uplink transmission, wherein the trigger frame includes a standard-compatible common info field that includes a trigger type field and a standard-compatible user info list field that includes at least one user info field, wherein the trigger frame includes a solicited Trigger-Based (TB) type indicator in a field in the trigger frame other than the trigger type field, and receiving, at the first device, at least one PPDU from the second device in response to the solicited TB type indicator that was transmitted in the trigger frame by the first device.
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公开(公告)号：US20230051675A1
公开(公告)日：2023-02-16
申请号：US17882505
申请日：2022-08-05
Applicant: NXP USA, Inc.
Inventor： Niranjan Grandhe , Christian Raimund Berger , Hongyuan Zhang , Sudhir Srinivasa
Abstract: In an 802.11az wireless system, a first station device transmits an NDP PPDU data unit in accordance with a range measurement packet exchange by constructing the NDP PPDU data unit to include an uplink (UL) length field element or a legacy signal length (LLEN) field element derived from a specified number of symbols (NHE-LTF) and number of repetitions (NLTF-REP) for the NDP PPDU data unit, and then sending the NDP PPDU data unit to a second STA device, where the values of the UL-length and LLEN field elements are computed as UL-Length=LLEN=10+y+6*Σi=1NUM_USERS((NLTF-REP(i)+1)*NHE-LTF(i)), where y=0 for NTB I2R/R2I NDP and TB R2I NDP PPDUs, and where y=3 for TB-I2R NDP PPDUs.
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公开(公告)号：US11463134B2
公开(公告)日：2022-10-04
申请号：US17174303
申请日：2021-02-11
Applicant: NXP USA, Inc.
Inventor： Sayak Roy , Ankit Sethi , Sudhir Srinivasa
IPC: H04B7/0408 , H04B7/06 , H04L1/00
Abstract: Wi-Fi communication is further secured by perturbation of a spatial mapping matrix. In an embodiment channel state information is obtained from a receiving device in a wireless network through the wireless network. A first set of beam steering vectors is derived based on the channel state information to direct a radio signal to the receiving device. A second set of beam steering vectors is derived based on the channel state information to direct a radio signal other than to the receiving device. A perturbation matrix is generated. A spatial mapping matrix is formed by combining the first and the second set of beam steering vectors with a perturbation matrix. Data symbols to be transmitted are pre-coded to the receiving device using the spatial mapping matrix and transmitted through the wireless network to the receiving device.
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公开(公告)号：US11431389B1
公开(公告)日：2022-08-30
申请号：US17305597
申请日：2021-07-10
Applicant: NXP USA, Inc.
Inventor： Ankit Sethi , Sayak Roy , Sudhir Srinivasa
IPC: H04L1/02 , H04B7/0456
Abstract: A beamformer generates a null data packet (NDP) that includes various long training fields (LTFs). The beamformer generates the NDP based on a spatial mapping matrix that is a product of two matrices. One matrix has a number of rows equal to a number of antennas of the beamformer, and a number of columns equal to a number of LTFs in the NDP. Further, the other matrix has a number of rows and a number of columns equal to the number of LTFs in the NDP. The number of LTFs in the NDP is greater than a number of antennas of the beamformer. Further, the beamformer transmits the NDP to a beamformee to obtain channel state information associated with a channel between the beamformer and the beamformee, and enable beamforming therebetween.
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Patent Agency Ranking
公开(公告)号：US20220029872A1
公开(公告)日：2022-01-27
申请号：US17386242
申请日：2021-07-27
Applicant: NXP USA, Inc.
Inventor： Rui Cao , Sudhir Srinivasa , Hongyuan Zhang , Liwen Chu
Abstract: In an 802.11be wireless system, a receiving station device signals a packet padding capability in a wireless area network in accordance with an Extremely High Throughput (EHT) communication protocol by constructing a MAC control management frame to include an EHT capability element indicating whether a packet extension value longer than 16 μs is supported by the receiving station device, where one or more fields in the EHT capability element include (1) a common nominal packet padding field having a plurality of values to signal different packet extension values for use with all transmission constellations, spatial streams Nss, and resource unit (RU) allocations supported by the first STA device, including at least one packet extension value longer than 16 μs; and/or (2) a PHY packet extension threshold (PPET) field comprising a plurality of PPET values to signal packet extension values including at least one packet extension value longer than 16 μs.
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公开(公告)号：US11233625B1
公开(公告)日：2022-01-25
申请号：US16591645
申请日：2019-10-03
Applicant: NXP USA, Inc.
Inventor： Ankit Sethi , Sudhir Srinivasa , Sayak Roy
Abstract: A method for signal transmission includes generating a sequence of modulated symbols, each modulated symbol including multiple sub-carriers having respective sub-carrier frequencies, by (i) designating a first subset of the sub-carriers to serve as non-pilot sub-carriers, and designating a second subset of the sub-carriers to serve as pilot sub-carriers, (ii) modulating non-pilot information onto the non-pilot sub-carriers, and modulating pilot information onto the pilot sub-carriers, and (iii) in at least some of the symbols, setting the non-pilot sub-carriers to a first power level, and setting one or more of the pilot sub-carriers to a second power level that is higher than the first power level. The sequence of the modulated symbols is transmitted over a communication channel to a receiver.
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公开(公告)号：US20210360472A1
公开(公告)日：2021-11-18
申请号：US17319060
申请日：2021-05-12
Applicant: NXP USA, Inc.
Inventor： Rui Cao , Sudhir Srinivasa , Hongyuan Zhang , Mao Yu
Abstract: In an 802.11be wireless system, data units are generated for transmission by configuring a transmitting device to process encoding parameters, including a first encoding parameter NSD and a second encoding parameter NSD,short, to select a padding boundary from pre-defined padding boundaries in the last symbol that will most closely include the number of information bits NEXCESS in the last symbol and to append padding bits to the number of information bits NEXCESS to fill up to the selected padding boundary in the last symbol, thereby generating pre-encoded data bits which are encoded for data transmission, where at least the first encoding parameter NSD is specified for an aggregated resource unit size that is allowed under the 802.11be protocol as a sum of NSD values for at two other resource units.
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公开(公告)号：US11140745B2
公开(公告)日：2021-10-05
申请号：US16686150
申请日：2019-11-17
Applicant: NXP USA, Inc.
Inventor： Sudhir Srinivasa , Hongyuan Zhang , Sri Varsha Rottela , B Hari Ram , Christian Raimund Berger
Abstract: A WLAN Access Point (AP) includes a MAC processor and a PHY processor. The MAC processor is configured to generate a trigger frame including user information fields destined to respective STAs, and a padding field including one or more padding bits, to determine a number of padding bits that, after the trigger frame including the padding bats being encoded for transmission, satisfy a processing-time constraint imposed by the STAs, and to insert the determined number of padding bits in the padding field. The PHY processor is configured to generate a packet from the trigger frame, including encoding the trigger frame in accordance with an ECC, into one or more code words whose length depends on a number of padding bits in the padding field, to generate multiple modulated symbols from the one or more code words of the packet, and to transmit the modulated symbols to the STAs.
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公开(公告)号：US11140709B1
公开(公告)日：2021-10-05
申请号：US16703894
申请日：2019-12-05
Applicant: NXP USA, Inc.
Inventor： B Hari Ram , Nilesh N. Khude , Sri Varsha Rottela , Vijay Ahirwar , Sudhir Srinivasa
IPC: H04W74/00 , H04W16/28 , H04W84/12 , H04W74/08 , H04W88/08 , H04B7/0417 , H04B7/0452
Abstract: A method for communication in a wireless local area network (WLAN) includes receiving, at first and second access points (APs) in the WLAN, uplink signals from a first client station (STA), which is associated with a basic service set (BSS) of the first AP. First downlink signals are transmitted from the first AP to the first STA using a first steering matrix. Responsively to the received uplink signals, a second steering matrix is computed, having a null in a direction of the first STA. Second downlink signals are transmitted from the second AP to a second STA in the WLAN using the second steering matrix.
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