Samsung Electronics Co., Ltd.

Ahmed Atef Ibrahim Ibrahim

Boon Loong Ng

Peshal Nayak

Vishnu Vardhan Ratnam

Rubayet Shafin

Jianzhong Zhang

Hao Chen

Shiyang Leng

Namjeong Lee

Rebal Al Jurdi

Jeongho Jeon

Gilwon Lee

Sooyoung Hur

Jianhua Mo

Zinan Lin

Rebal Jurdi

Methods and apparatuses for facilitating enhanced channel quality measurements on links of a multi-link device (MLD) in a wireless local area network. A non-access point (AP) MLD comprises stations (STAs), each comprising a transceiver configured to form a link with a corresponding AP affiliated with an AP MLD and receive, over the link, a channel sounding signal. The non-AP MLD further comprises a processor configured to determine, based on the channel sounding signal received at a first time over a first one of the links, an initial channel quality indicator (CQI) value for the first link, and determine, based on interference caused on the first link by a second one of the links at a second time, a CQI offset value for the first link relative to the initial CQI value. The transceivers are configured to transmit, to the AP MLD, the initial CQI value and the CQI offset value.

CQI enhancement for multi-link operation

Methods and apparatuses for facilitating avoidance of NSTR constraint violation caused by TDLS channel switching and link enablement in multi-link operation (MLO) in a wireless local area network. The methods include determining to switch a frequency channel used by a first tunneled direct link setup (TDLS) direct link from a first frequency channel to a second frequency channel, wherein the TDLS direct link is formed between a station (STA) of a non-access point (AP) multi-link device (MLD) and a corresponding peer STA, generating a TDLS channel switch notification message that includes an indication that the first TDLS direct link is switching from the first to the second frequency channel, and transmitting, to an AP MLD with which the non-AP MLD is associated, on an MLO link, the TDLS channel switch notification message, wherein MLO links are formed between STAs of the non-AP MLD and APs of the AP MLD.

Tunneled direct-link setup channel switching with non-simultaneous transmit and receive operation

Methods and apparatuses in a wireless communication system. A base station (BS) includes a transceiver and a processor. The processor is configured to receive, via the transceiver, a channel state information (CSI) report from at least one user equipment (UE). The processor is also configured to configure CSI-reference signal (RS) resources for the at least one UE. The processor is further configured to, based on the CSI report from the at least one UE, perform one of: set a transmission power to full power for transmission in a physical downlink shared channel (PDSCH); or apply a back-off percentage to the transmission power in the PDSCH.

Hybrid PDSCH for out-of-band earth station interference cancelation

Methods and apparatuses for facilitating mobile AP MLD operation. A method comprises determining whether a second AP operating on a non-primary link forms an NSTR link pair with a first AP operating on a primary link; determining whether a second STA operating on the non-primary link forms an NSTR pair with a first STA operating on the primary link; transmitting frames on the non-primary link without synchronizing PPDUs with a frame transmission on the primary link when: the second AP does not form the NSTR link pair with the first AP, and the second STA does not form the NSTR pair with the first STA; and transmitting frames on the non-primary link by synchronizing the PPDUs with the frame transmission on the primary link when: the second AP forms the NSTR link pair with the first AP, or the second STA forms the NSTR pair with the first STA.

Method and apparatus for mobile AP MLD operation

A non-access point (AP) MLD comprises STAs, each comprising a transceiver that forms a link with a corresponding AP of an AP MLD, and a processor. A restricted TWT (R-TWT) schedule is established on a first link, and a first STA on that link is a member of an R-TWT service period (SP) on that link. A second STA on a second link is not a member of any R-TWT SP on that link that overlaps with the R-TWT SP on the first link. The processor transitions the non-AP MLD into EMLSR operation wherein the first and second links form an EMLSR link pair, determines that a transmission opportunity (TXOP) has begun on the second link, and coordinates between the STAs such that a frame exchange sequence with the AP MLD on the second link during the TXOP does not overlap with the R-TWT SP on the first link.

Restricted TWT with enhanced multi-link single radio (EMLSR) operation

Methods and apparatuses for facilitating the coexistence of enhanced multi-link single radio (EMLSR) operation with target wake time (TWT) operation in a wireless local area network. A non-access point (AP) MLD comprises STAs, each comprising a transceiver that forms a link with a corresponding AP of an AP MLD, and a processor. A restricted TWT (R-TWT) schedule is established on a first link, and a first STA on that link is a member of an R-TWT service period (SP) on that link. A second STA on a second link is not a member of any R-TWT SP on that link that overlaps with the R-TWT SP on the first link. The processor transitions the non-AP MLD into EMLSR operation wherein the first and second links form an EMLSR link pair, determines that a transmission opportunity (TXOP) has begun on the second link, and coordinates between the STAs such that a frame exchange sequence with the AP MLD on the second link during the TXOP does not overlap with the R-TWT SP on the first link.

Methods and apparatuses for enhancing advertisement of restricted target wake time (TWT) schedules by access points (APs) and improving selection of restricted TWT schedules by stations (STAs) in a wireless local area network. A wireless STA apparatus comprises a transceiver and a processor operably coupled to the transceiver. The transceiver is configured to receive, from an AP, a restricted TWT advertisement that includes a restricted TWT schedule and additional information about the restricted TWT schedule. The processor is configured to determine, based on the additional information, whether to refrain from requesting to become a member of the restricted TWT schedule.

Restricted TWT enhanced information advertisement procedure for next generation WLAN

Methods and apparatuses for facilitating multi-AP association on NSTR links. A method for wireless communication performed by a non-access point (AP) multi-band device (MBD), wherein the non-AP MBD comprises wireless stations (STAs), the method comprising: identifying, while a first STA of the STAs is associated with a first AP, that a second STA of the STAs is either associated or to be associated with a second AP; detecting a non-simultaneous transmit and receive (NSTR) condition; when the second STA is to be associated with the second AP, determining whether an association procedure to associate the second STA with the second AP is to be initiated based on a first MBD transmission procedure; and when the second STA is associated with the second AP, generating an indication to initiate a second MBD transmission procedure.

Multi-AP association on NSTR links

Methods and apparatuses for facilitating quality of service traffic handling under NSTR constraints. A method of wireless communication performed by a non-access point (AP) multi-link device (MLD) comprises: forming a link with a corresponding AP of an AP MLD; detecting a non-simultaneous transmit and receive (NSTR) link pair; detecting that respective links of the NSTR link pair have transmit opportunity (TXOP) durations having different values; and managing communication on the respective links of the NSTR link pair based on access categories (ACs) to reduce interference between the respective links of the NSTR link pair.

Method and apparatus for quality of service traffic handling under NSTR constraints

Methods and apparatuses for facilitating the switching of an established target wake time (TWT) schedule from one link to another link of a multi-link device (MLD) in a wireless local area network. The apparatuses include an access point (AP) MLD comprising APs and a processor operably coupled to the APs. Each AP comprises a transceiver configured to form a link with a corresponding station (STA) affiliated with a non-AP MLD. The processor is configured to negotiate with the non-AP MLD via one of the APs to establish a TWT schedule for communications on a first one of the links, receive, from the non-AP MLD via one of the APs, a request to transfer the TWT schedule from the first link to a second one of the links, and in response to the request, establish the TWT schedule for communications on the second link.

TWT schedule switch operation for multi-link devices

A system and method for user selection in distributed multiple-input, multiple-output (MIMO). The system performs a method that includes configuring a first channel state information-reference signal (CSI-RS) resource set for a serving transmission point (TRP) and a second CSI-RS resource for a concatenated channel, wherein the concatenated channel is between a virtual panel and the apparatus, the virtual panel comprising distributed panels from a serving TRP and a helping TRP. The method also includes computing a metric as a function of one or more quantities included in one or more measurement reports, received from a user equipment (UE), for the concatenated channel and at least one of the serving TRP channel or the helping TRP channel. The method also includes configuring, based on the metric, the UE for one of: a legacy transmission or a distributed MIMO transmission.

Method and apparatus for user selection in distributed MIMO

Methods and apparatuses in a wireless communication system. A base station (BS) includes a transceiver and a processor. The processor regulates a transmit power in a direction of an earth station or a predefined receiver by: calculating a power flux density for the BS to the earth station or the predefined receiver; calculating an equivalent antenna gain for other base stations; calculating a directional power back-off level for the other base stations with respect to the earth station or the predefined receiver; generating a restricted precoding matrix indicator based on the calculated directional power back-off level; generating an N1-N2 bitmap for the BS; and applying the N1-N2 bitmap for signal transmission to at least one UE. The N1-N2 bitmap is generated based on: physical parameters of the earth station of the predefined receiver; physical parameters of the BS; an operator input metric; or restricted precoding matrix indicator.

Apparatus and method for N1-N2 bitmap generation for cellular communication system

Embodiments of the present disclosure provide methods and apparatuses for facilitating restricted target wake time (TWT) operation in a wireless local area network. The apparatuses include a non-access point (AP) multi-link device (MLD) comprising a plurality of stations (STAs) and a processor. Each STA comprises a transceiver configured for broadcast TWT operation on multi-link operation (MLO) links with corresponding APs of an AP MLD. The processor is operably coupled to the transceivers, and configured to negotiate a broadcast TWT schedule over a first link between a first STA and a first AP of the AP MLD, apply the broadcast TWT schedule to the group of links, negotiate a restricted TWT schedule with the AP MLD over at least one link of the group of links, and establish the restricted TWT schedule on one or more links of the at least one link.

Restricted TWT operations for multi-link devices

A method includes obtaining, by a transmit-receive point (TRP), a set of power metrics for multiple UEs including a served UE and one or more helped UEs, wherein each power metric is estimated from multiple channel quality and performance indicators of one of the multiple UEs. The method also includes calculating a performance metric as a function of at least one of the multiple channel quality and performance indicators of the served UE. The method also includes calculating an interference metric as a function of the set of power metrics. The method also includes determining whether to perform coordinated beamforming based on the performance metric and the interference metric. The method also includes determining one or more precoders based on the determination of whether to perform the coordinated beamforming.

Growing community of inventors

Plano, TX, United States of America

Ahmed Atef Ibrahim Ibrahim