185 results about "Orthogonal frequency-division multiple access" patented technology

Dynamic puncturing in a wireless local area network (WLAN) supporting 320 MHz bandwidths is disclosed. In one example, a method includes a first station (STA1) transmitting a null data packet announcement (NDPA) frame including an indicator of an orthogonal frequency division multiple access (OFDMA) subchannel puncturing over a wireless medium and subsequently transmitting a null data packet (NDP) having a U-SIG field specifying an OFDMA puncturing pattern. The NDPA may indicate that the subsequent NDP, which preferably occupies an 80 MHz channel, includes the OFDMA puncturing pattern in its U-SIG field. The method may further include transmitting a beamforming report poll (BFRP) soliciting measurement by the receiving station (STA2) on active resources, e.g., subchannels which have not been punctured. STA2 may transmit a beamforming report (BFR) in response to the BFRP, the BFR including measurements of active resources excluding subchannels inactive due to static OFDMA puncturing or dynamic OFDMA puncturing.

Method and apparatus for supporting simultaneous MultiUser (MU) Multiple-Input Multiple-Output (MIMO) operations utilizing Orthogonal Frequency Division Multiple Access (OFDMA) with Uplink OFDMA Random Access (UORA). Access Points (APs) trigger and obtain short PPDUs from the stations to learn spatial filtering patterns that are utilized in adjusting antenna phase differences to obtain minimum / maximum energy from this BSR. The APs determine favored and unfavored directions of communication, which are conveyed to non-AP UORA stations as channel estimation signals. The UORA stations base broadcasting on strengths of channel estimation signals to determine eligible UORA resource units. The UORA procedure to secondary APs allows a primary AP to trigger a UL-MU MIMO transmission with the number of spatial streams exceeding the number of antennas at the primary AP.

A communication method has the step of: transmitting or receiving first data using a first resource unit (RU) of a plurality of first RUs in a first frequency band having a first bandwidth (BW) for orthogonal frequency division multiple access (OFDMA); wherein each of the plurality of first RUs has a plurality of subcarriers; and wherein, in the first RU, at least two neighboring subcarriers thereof are separated by one or more subcarriers belonging to one or more other first RUs of the plurality of first RUs.

An electronic device (such as an access point) is described. This electronic device transmits an orthogonal frequency division multiple access (OFDMA) frame to a recipient electronic device (such as a client or a station). The OFDMA frame includes multiple predefined resource units (RUs) allocated to the recipient electronic device in a set of predefined RUs having associated frequency bandwidths. Moreover, the multiple predefined RUs include two or more first predefined RUs having a first number of tones less than a predefined amount, or two or more second predefined RUs having a second number of tones greater than or equal to the predefined amount. For example, the predefined amount may include 242 tones. Note that the multiple predefined RUs may have the same or different numbers of tones. Moreover, the electronic may receive an acknowledgment or a block acknowledgment from the recipient electronic device.

The invention relates to a system and method for frequency domain copy mode transmission using orthogonal codes. A system for providing copy mode orthogonal frequency division multiple access transmission while maintaining a relatively low peak-to-average power ratio is disclosed. Data to be transmitted are converted into symbols, and the symbols are copied to a certain number of resource units. A phase shift is applied to a number of symbols prior to transition to the time domain for transmission. The phase shift may be removed at the receiver prior to decoding the signal into transmitted data.

Proposed are a method and an apparatus for receiving a PPDU in a wireless LAN system. Specifically, a receiving STA receives a PPDU from a transmitting STA via broadband communication and decodes the PPDU. The PPDU is received on the basis of an OFDMA scheme. The PPDU includes a first signal field. The first signal field includes first information on a preamble puncturing pattern for each 80 MHz band in the broadband communication. The first information consists of a 4-bit bitmap for the 80 MHz band.

Device, systems, and / or techniques for using sub-channel signaling information between an access point and a first station are disclosed. In one aspect, a method performed by a station (STA) includes: receiving, from a neighboring STA in an overlapping basic service set (OBSS), a physical (PHY) layer preamble that includes a signal field indicating a plurality of sub-bands and associated power thresholds for Uplink Orthogonal Frequency-Divisional Multiple Access (UL OFDMA) transmission, that are available for OBSS spatial reuse (SR) by the STA; and sending, to an AP with which the STA is associated, an UL OFDMA transmission using a sub-band of the plurality of sub-bands and an associated power threshold indicated in the signal field. Additional embodiments are disclosed.

The invention discloses an Internet of Vehicles secure unloading and cache optimization method based on a graph neural network, relates to the field of intelligent traffic and edge computing, and aims to solve the problems of low resource scheduling efficiency, insufficient privacy protection and task and cache processing separation of the Internet of Vehicles. The method comprises the following steps: S1, constructing an Internet of Vehicles system model, a communication model comprising a vehicle-roadside unit-macro base station architecture, an orthogonal frequency division multiple access and dedicated short-range communication protocol, and a calculation model comprising local processing and partial remote unloading; s2, Gaussian noise is introduced to realize differential privacy protection, and asynchronous federated learning is combined with a long-short-term memory network to predict task popularity; and S3, constructing a dynamic heterogeneous graph, extracting spatio-temporal features by means of a graph neural network, inputting a near-end strategy optimization algorithm, and jointly optimizing an unloading target, a proportion and a caching strategy. According to the method, the collaborative improvement of privacy security, low system total time delay, high cache hit rate and resource utilization rate is realized, and the method adapts to the dynamic topology and complex task requirements of the Internet of Vehicles.

Provided are a wireless communication terminal including: a processor; and a communication unit, wherein the processor obtains a backoff counter for an OFDMA-based random access of the terminal, wherein the backoff counter is obtained within a range of a contention window for the uplink OFDMA-based random access, receives a trigger frame indicating an uplink multi-user transmission, when one or more resource unit(s) in which random access can be performed is indicated by the trigger frame, decrements the backoff counter based on a number of resource units(s) in which random access can be performed, and when the backoff counter is 0 or decremented to 0, performs an uplink multi-user transmission through a selected resource unit among the resource units(s) and a wireless communication method using the same.

Embodiments of the present application provides system, methods and apparatus for partial long training sequence (LTS) using DRU tone plan. An orthogonal frequency division multiple access (OFDMA) frame is transmitted using a plurality of DRUs. The frame includes a scattered long training field (SLTF) portion which furthers includes one or more orthogonal frequency division multiplexing (OFDM) symbols. Each of these symbols carries a portion of the LTS using a respective DRU. At least two different OFDM symbols use different respective DRU to carry the LTS portion. Each of these symbols further carries data using another respective one or more DRUs. Transmission of this frame may inhibit LTF overhead and may allow for transmitting increased data size.

To provide a communication device, a communication method, and a program that efficiently identify a device that performs relay communication when the relay communication is used in communication between an access point and a station.SOLUTION: In a wireless communication system, a communication device that communicates with another communication device communicates data frames by selectively using a first communication method in which radio resources are allocated using at least two or more first-type resource units (RUs) each consisting of a plurality of subcarriers arranged contiguously on a frequency axis based on capability of the other communication device, and data is communicated by orthogonal frequency division multiple access (OFDMA) using the radio resources, and a second communication method in which radio resources are allocated using at least two or more second-type RUs each consisting of a plurality of subcarriers arranged so that at least some of the subcarriers are discontinuous on the frequency axis, and the data is communicated by the OFDMA using the radio resources.SELECTED DRAWING: Figure 14

The application discloses a local communication service resource isolation method and device, a storage medium and an electronic device, the method calculates resource demand and access value of a communication service based on access information of the communication service, abstracts the problem of resource allocation for the communication service based on the resource demand and the access value into a two-dimensional matrix packing problem based on an orthogonal frequency division multiple access technology, solves the two-dimensional matrix packing problem by using a pointer network and an Actor-Critic algorithm, and obtains a network slice allocation result of the communication service, so that the reasonable use of spectrum resources is realized by technologies such as OFDMA, meanwhile, the transmission of more valuable communication services is ensured by considering the resource demand and the access value during allocation, and finally, the logical isolation between communication services is realized by constructing a network slice during resource allocation of the communication services.

Systems, methods and instrumentalities are disclosed to transmission scheduling. A station (STA) in its own basic service set (BSS) receiving a transmission frame from an overlapping BSS (OBSS). The STA may decode preamble of the received transmission frame. The STA may determine, for example, using the decoded preamble that OBSS information and transmit scheme associated with the OBSS. On a condition that the transmit scheme associated with the OBSS is orthogonal frequency divisional multiple access (OFDMA), the STA in its own BSS may indicate to its access point (AP) that one or more channels or sub-channels that are available or not available for transmission. On a condition that the transmit scheme determined from the preamble of the transmission frame is orthogonal frequency divisional multiplexing (OFDM), the STA may determine that a channel is not available for transmission. The STA may set the channel to busy or idle.

An communication apparatus of the present disclosure comprises a receiver that receives a Trigger frame for allocating resource units (RUs) for random access and another frame including Random Access parameter element that comprises a first field indicating an OFDMA contention window (OCW) minimum value (OCWmin) and a second field indicating an OCW maximum value (OCWmax); and control circuitry that controls Uplink OFDMA-based Random Access (UORA) procedure using the OCWmin and the OCWmax.

An energy efficiency optimization method for multi-cell communication systems based on intelligent reflector-assisted rate division multiple access (RSMA) combines RSMA with intelligent reflector RIS. RIS intelligently regulates signal transmission links to enhance signal transmission quality, thereby improving signal quality for users at cell edges. RSMA effectively suppresses co-channel interference between users by flexibly controlling rate division strategies and beamforming. To this end, an optimization problem is constructed with the goal of maximizing system energy efficiency, jointly optimizing the beamforming vector, rate division multiple access matrix, and phase shift matrix on the base station side and the RIS side. To solve this non-convex optimization problem, an iterative solution is proposed for the beamforming, rate division, and phase shift optimization subproblems. Continuous convex optimization is used for the former, and semidefinite programming and penalty function methods are used for the latter. Compared with traditional space division multiple access and non-orthogonal frequency division multiple access, this method can achieve energy efficiency improvements of 28.5% and 10.2% for multi-cell communication systems, respectively.

According to one embodiment, a wireless communication device includes: a receiver configured to receive a first frame notifying a start of resource unit-based OFDMA (Orthogonal Frequency Division Multiple Access) communication via a first channel; and controlling circuitry configured to control, when the first frame is received, the receiver to perform standby operation at least in a first resource unit in a second channel different from the first channel, wherein the first resource unit includes one or more subcarriers among a plurality of subcarriers disposed in the second channel.

The present disclosure provides methods, apparatuses, and systems for sharing resources of a wireless medium. Certain implementations more specifically relate to coordinated AP (CAP) time division multiple access (TDMA) and orthogonal frequency division multiple access (OFDMA) techniques for sharing time or frequency resources of a transmission opportunity (TXOP). According to such techniques, an AP that wins contention for the duration of a TXOP and obtains access to the wireless medium can share its time or frequency resources with other selected APs. To share its resources, the winning AP can divide the TXOP into multiple time or frequency segments, each time or frequency segment including corresponding time or frequency resources representing a portion of the TXOP, and allocate each of these time or frequency segments to the winning AP itself or to one of the selected APs.

There are provided methods and systems for scheduling downlink (DL) and uplink (UL) transmissions in one or more Point-to-Multipoint (PTMP) IEEE 802.11 orthogonal frequency division multiple access (OFDMA) based wireless communication networks, each network comprising one or more IEEE 802.11 OFDMA based Access Points (APs) wherein each AP of said one or more APs comprises associate one or more IEEE 802.11 OFDMA stations (STAs), the method comprising the steps of: synchronizing the one or more STAs within each network using one or more synchronization signals transmitted between the one or more APs and the one or more STAs; allocating one or more Framing Slots, wherein each Framing Slot having a fixed time duration; dividing each Framing Slot of said one or more Framing Slots into DL burst transmission and UL burst transmission periods wherein the DL burst transmission periods comprise one or more DL Data Units Bursts and continuously scheduling by said one or more IEEE 802.11 OFDMA based APs the one or more DL Data Units Bursts during said DL transmission period to said one or more STAs; and continuously sending said one or more UL Data Unit Bursts by said one or more STAs to said respective one or more APs.

Techniques and apparatus for avoiding uplink orthogonal frequency division multiple access (OFDMA)-based random access (UORA) collisions for uplink transmissions are described. An example technique includes obtaining, by a wireless device, information indicating (i) a UORA resource unit (RU) assigned to a multi-user (MU) group including the wireless device and (ii) a number of spatial streams associated with the MU group. A respective user position associated with the wireless device within the MU group is determined from multiple user positions. A spatial stream of the number of spatial streams is selected based on the user position. Uplink data is transmitted on the UORA RU using the spatial stream.

Tone planning for wireless communications is provided. The present disclosure provides methods, devices and systems that support communication using Orthogonal Frequency Division Multiple Access (OFDMA) according to a tone plan that supports 20 MHz sub-channel puncturing within a wireless channel. In some aspects, a non-legacy tone plan may define a set of tones for resource units (RUs) such that the RUs do not overlap with 20 MHz sub-channel boundaries of a wireless channel. The position of the set of tones in the non-legacy tone plan may be shifted relative to a corresponding tone associated with a corresponding RU according to the legacy tone plan. One or more of the disclosed tone plans may enable puncturing of the sub-channels while utilizing some RUs that otherwise partially overlap with the punctured sub-channels in legacy tone plans.

A reception method and apparatus for use in a multi-cell orthogonal frequency division multiple access (OFDMA) wireless system. In a unicast receive mode during a first receive time period, a first group of orthogonal frequency division multiplexing (OFDM) symbols is received by a mobile device from multiple of a plurality of antennas at a serving base station. In a single-frequency-network (SFN) receive mode during a second receive time period, a second group of OFDM symbols is received by the mobile device from one of a plurality of antennas at the serving base station. The transition between the first receive time period and the second receive time period occurs during a cyclic prefix or a cyclic postfix between OFDM symbols, and the plurality of antennas produce a first beam pattern during the unicast receive mode and a second beam pattern during the SFN receive mode.

This disclosure provides systems and methods for selectively enabling multi-user (MU) communications. In some implementations, an access point (AP) obtains one or more packets associated with a traffic flow, and obtains at least one of service-level agreement (SLA) parameters associated with the traffic flow, attributes of the traffic flow, or network parameters associated with a basic service set (BSS) that includes the AP. The AP provides an indication of whether the traffic flow is suitable for transmission as a single-user (SU) multiple-input multiple output (MIMO) (SU-MIMO) communication, as a multi-user (MU) MIMO (MU-MIMO) communication, as an orthogonal frequency division multiple access (OFDMA) communication, or as a partial bandwidth (BW) MU-MIMO communication to a WLAN subsystem of the AP, the indication being based on one or more of the SLA parameters, the traffic flow attributes, or the network parameters.

The embodiment of the invention provides a data-driven resource allocation method, which belongs to the technical field of communication, and specifically comprises the following steps: forming an air-space-ground network; performing three-layer clustering on the monitoring area; merging and splitting the cluster and the group according to a preset standard; designing a three-hop transmission process; designing a ground-sky transmission model according to beam allocation and a rendezvous point rotation mechanism; designing a space-air transmission model according to a non-orthogonal frequency division multiple access technology; constructing a global optimization problem according to the ground-sky transmission model and the sky-air transmission model, and splitting the global optimization problem into a first optimization problem corresponding to the ground-sky transmission model and a second optimization problem corresponding to the sky-air transmission model; setting a solution scheme of the first optimization problem; setting a solution scheme of a second optimization problem; designing an ISS-PPO algorithm to solve the first optimization problem and the second optimization problem; and designing a global optimization problem solution. Through the scheme disclosed by the invention, the data transmission timeliness and the frequency spectrum energy efficiency are ensured.

Logic to generate a 320 megahertz (MHz) extremely high throughput (EHT) physical layer protocol data unit (PPDU) comprising a multi-resource unit (MRU). Logic to generation of a non-orthogonal frequency division multiple access (non-OFDMA) 320 MHz EHT PPDU, wherein the MRU comprises a 240 MHz multi-MRU, the 240 MHz MRU comprising at least two contiguous 996 tone resource units (RUs). Logic to generation of an OFDMA 320 MHz EHT PPDU, wherein the MRU comprises at least one 996 tone RU and one 484 tone RU. Logic to cause the transmission of the 320 MHz EHT PPDU. And logic to receive and decode the 320 MHz EHT PPDU.

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for implementing multi-user (MU) communication in a wireless mesh network. A first mesh node or a network management unit may collect information from various mesh nodes and form MU association groups based on the information. An MU association group may include an MU group head that coordinates MU group communication to or from member mesh nodes that are in the MU association group. For example, the MU group head may coordinate orthogonal frequency division multiple access (OFDMA) resource unit allocations, or MU multiple-input-multiple-output (MU-MEMO) spatial stream configurations, among other examples. Different MU association groups may be formed for uplink or downlink traffic. The creation of MU association groups may enable a wireless mesh network to realize the advantages of MU group communication within the flexible topology of a mesh environment.

A communication method has the steps of: transmitting a signal to a device using a first resource unit (RU) in an orthogonal frequency-division multiple access (OFDMA) physical layer protocol data unit (PPDU) having a plurality of subcarriers for transmitting data, pilot symbols, or a combination thereof. The first RU is one of a plurality of RUs of the OFDMA PPDU, each RU comprises a subset of the plurality of subcarriers, and, in each RU, each pair of neighboring subcarriers thereof are separated by a substantially same number of subcarriers belonging to one or more other RUs of the plurality of RUs. In some embodiments, the subcarriers of each RU are same as those determined in accordance with a design method that shuffles the plurality of subcarriers using a relative prime interleaving method.

The invention discloses a switching scheme for selectively joining and quitting multi-user orthogonal frequency division multiple access. This document describes methods, devices, systems, and apparatus for selecting a handover scheme to join and exit multi-user orthogonal frequency division multiple access (MU-OFDMA). In one aspect, an electronic device (110) enters (302) a MU-OFDMA mode to communicate over a shared channel bandwidth via a wireless network (130). During the MU-OFDMA mode, the electronic device (110) determines (306) that an uplink queue size is greater than a first threshold size. In response to the determination, the electronic device (130) selects to exit (310) the MU-OFDMA mode and enter (312) a single user mode to compete for a transmit channel for transmitting uplink data.

This invention discloses a modeling method for the phase shift model of each subcarrier in an intelligent reflecting surface (IRS)-assisted downlink orthogonal frequency division multiple access system, as well as a system optimization method. First, the IRS phase shift at multiple frequencies is calculated at a sufficient number of center frequency phase points. A quadratic function curve with coefficients related to frequency is used to fit the relationship between the phase shift and the center frequency phase shift, thus obtaining a function of the center frequency phase shift and other frequency phase shifts. Based on the designed phase shift model, an optimization problem is constructed to optimize the IRS center frequency phase shift matrix, subcarriers, and power allocation, maximizing the system's sum and rate. Finally, this invention transforms the original problem into a convex problem and solves it using successive convex approximation and alternating optimization methods. Simulation results demonstrate that, compared to optimization schemes assuming the same IRS phase shift on all subcarriers within the transmission band, the scheme optimized under the phase shift model presented in this invention achieves a higher practically achievable sum and rate under actual IRS phase shift conditions.

For example, a wireless communication device can be configured to: determine RU allocations to multiple resource elements (RUs) of multiple wireless communication stations (STAs), the RU allocation assigning RUs from the multiple RUs to STAs from the multiple STAs, wherein the size of the RUs assigned to the STAs is based at least on a service rate parameter, the service rate parameter depending on the service rate of the downlink (DL) service of the STA; and transmit multi-user (MU) DL orthogonal frequency division multiple access (OFDMA) physical layer protocol data units (PPDUs) to the multiple STAs according to the RU allocation.

The present invention relates to a wireless transmission station (110, 120), and more particularly, to a wireless transmission station (110, 120), which uses a resource unit (RU) or a multi-resource unit (MRU) in orthogonal frequency division multiplexing (OFDMA) communication or orthogonal frequency division multiple access (OFDMA) communication, and to a wireless transmission station (110, 120), which uses the resource unit (RU) or the multi-resource unit (MRU) in the orthogonal frequency division multiplexing (OFDMA) communication, and to a wireless transmission station (110, 120), which uses the resource unit (RU) or the multi-resource unit (MRU) in the orthogonal frequency division multiplexing (OFDMA) communication or the multi-resource unit (MRU) in the orthogonal frequency division multiple access (OFDMA) communication. The wireless transmission station (110, 120) is configured to allocate, based on the bit sequence, a first subset of a plurality of subcarriers of the RU or MRU as a data subcarrier for carrying modulation data, and to allocate, based on the bit sequence, a second subset of the plurality of subcarriers of the RU or MRU as an IM pilot subcarrier for carrying a plurality of predefined interference suppression (IM) pilot symbols. Furthermore, the wireless transmitting station (110; 120) is configured to permutate the plurality of subcarriers of the RU or MRU, the plurality of subcarriers comprising the first subset comprising data subcarriers and the second subset comprising IM pilot subcarriers, to obtain a plurality of permuted subcarriers of the RU or MRU.