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

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.

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

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.

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.

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.

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.

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

Disclosed is a wireless transmission station (110) for transmitting a bit sequence to a wireless receiving station (120) by means of an orthogonal frequency division multiplexing (OFDM) communication or an orthogonal frequency division multiple access (OFDMA) communication through a channel (130) having a channel bandwidth, and a method for transmitting the bit sequence to the wireless receiving station (120) by means of the orthogonal frequency division multiplexing (OFDMA) communication or the orthogonal frequency division multiple access (OFDMA) communication. The wireless transmitting station (110) is configured to encode the bit sequence using a forward error correction (FEC) encoder to obtain an encoded bit sequence, and to fill the encoded bit sequence with FEC post-fill bits to obtain a filled encoded bit sequence, wherein the number of bits of the filled coded bit sequence is set for modulation on K subcarriers of a resource unit (RU) defined by the IEEE 802.11 standard framework.

This provides a technology for appropriately applying Distributed Tone Resource Units (DRUs) to Coordinated Orthogonal Frequency Division Multiple Access (C-OFDMA) in the Basic Service Set. [Solution] A communication device according to one aspect of the present disclosure is a communication device that functions as an Access Point (AP) as defined in the IEEE 802.11 standard series, and includes a transmission means for transmitting an information element that includes information indicating that the communication device has the capability to support Coordinated Orthogonal Frequency Division Multiple Access (C-OFDMA) using a Distributed tone Resource Unit (DRU).

This disclosure provides methods, components, devices, and systems for sounding for trigger-based ranging. Some aspects more specifically relate to a first wireless device dividing a frequency bandwidth available for ranging procedures into a plurality of subbands in accordance with orthogonal frequency-division multiple access (OFDMA) techniques. In some implementations, the first wireless device may transmit a trigger frame that assigns a subband to a respective neighbor wireless device. Each respective neighbor wireless device may transmit, during a same time occasion, a respective sounding signal via each respective subband allocated to the respective neighbor wireless device. In some implementations, the first wireless device may perform sounding procedures using combined multiple input multiple output (MIMO) and OFDMA techniques, where each neighbor wireless device may be assigned a respective spatial stream. Accordingly, the first wireless device may support sounding procedures for larger quantities of neighbor wireless devices.

The present disclosure relates generally to coding modulation techniques for use in digital communication systems such as Orthogonal Frequency Division Multiple Access (OFDMA) systems. More particularly, the present disclosure relates to methods and apparatus for multi-level encoding and decoding. Different receivers coupled to different parallel downlink channels having different channel qualities decode different received signal constellations at different levels of resolution. This allows the overall OFDMA downlink to operate at significantly higher data rates, thereby significantly improving system-level bandwidth efficiency.

Embodiments disclosed herein are directed to communicating time-critical ultra-low latency (ULL) data using one or more dedicated resource units (RUs). A station (STA) decodes a trigger frame received from an access point station (AP) encoded to indicate resource units (RUs) of an UL PPDU for an uplink multi-user orthogonal frequency division multiple access (UL MU OFDMA) data transmission by a first and a second station STA. The trigger frame may also be encoded to indicate configuration information for a dedicated RU for time-critical ultra-low latency (ULL) UL data. The dedicated RU may be one RU of one or more RUs of the UL PPDU that are reserved for time-critical communications. The STA may encode time-critical ULL UL data for transmission to the AP on the dedicated RU during the uplink MU OFDMA data transmission by the first and second STAs. The time-critical ULL UL data may start at any time during transmission of the UL PPDU. Medium access control layer (MAC) padding may be included in a MAC payload until the time-critical ULL UL data is available at the MAC layer of the STA.

In some aspects, the disclosure is directed to methods and systems for signaling and decoding of punctured sub-bands in a trigger-based PPDU. In one aspect, at least one of the communication interface or the processing circuitry of a wireless communication device is configured to generate a trigger frame that includes signaling indicating that at least one other wireless communication device is allowed to reduce a bandwidth of an allocated resource unit (RU) for transmitting data via a communication channel; transmit, via the communication channel, the trigger frame to at least one other wireless communication device; receive, via the communication channel and from the at least one other wireless communication device, an uplink (UL) orthogonal frequency division multiple access (OFDMA) frame including the data; and process the UL OFDMA frame including the data based on the signaling.

Systems and methods for Orthogonal Frequency-Division Multiple Access (OFDMA) optimized steering in Wi-Fi networks (10, 10A, 32). The present disclosure contemplates operation in a multiple access point network (14, 36) utilizing OFDMA technology, e.g., IEEE 802.11ax, where clients are connected to the access points considering the effect on OFDMA operation depending on where the clients are connected. That is, the present disclosure considers OFDMA operation in the context of optimization in a distributed or multiple access point network (14, 36). The optimization decision is based on capabilities of client devices and / or the access points, including OFDMA capability, MIMO capability, channel capability, etc. The optimization decision is used to select where client devices should connect, and optimization factors may include individual device throughput, joint load throughput (system capacity), fairness, etc.

The invention relates to the technical field of industrial wireless communication, in particular to a time-frequency joint calibration method based on carrier frequency offset and terminal equipment, and the method comprises the steps that the terminal equipment receives a downlink wireless frame sent by access point equipment, obtains the carrier frequency offset through a known reference signal in the frame, and transmits the carrier frequency offset to the access point equipment; the offset represents the relative deviation of the frequency of the crystal oscillator and is stored; when time synchronization calibration or uplink transmission is needed, the offset is read, and the local timestamp growth rate is adjusted or frequency pre-compensation is carried out on an uplink signal. The terminal equipment comprises a receiving unit, a processing unit, a storage unit, a reading unit, a time calibration unit and a frequency compensation unit. According to the invention, time-frequency joint calibration is realized by using single frequency offset estimation, trigger frame interaction is reduced, system control overhead and communication delay are reduced, and synchronization precision and signal orthogonality of multi-user uplink orthogonal frequency division multiple access transmission are improved.

The present disclosure describes a system for applying precise timing to a mesh wireless Wi-Fi network. Accurate timing enables multiple access points (APs) to serve a single station (STA)-when the STA is located in a wireless coverage area including more than one access point, without the need for a wireless trigger frame. Various examples are described, including the use of orthogonal frequency division multiple access (OFDMA), time division multiple access (TDMA), and multiple access point joint transmissions.

A method and device are provided for receiving and transmitting data in a wireless local area network. The device receives a Physical Layer Protocol Data Unit (PPDU) from a station across a transmission bandwidth and determines whether the station belongs to a Basic Service Set (BSS) managed by the device, based on the PPDU. When the PPDU is multi-user (MU-PPDU), the access point (AP) determines that the station does not belong to the BSS managed by the AP. Such an MU-PPDU includes a first signal field and a second signal field; the first signal field contains bandwidth information indicating the transmission bandwidth, and the second signal field contains user-specific information allocated for orthogonal frequency-division multiple access (OFDMA) transmission.

An OFDMA power control method includes: transmitting a first trigger frame to a station, wherein the first trigger frame includes a first target RSSI; receiving a first TB-PPDU from the station, wherein the first TB-PPDU is transmitted by the station using a first power according to the first target RSSI; measuring a first power of the first TB-PPDU to obtain a first measured RSSI; and generating a second the target RSSI according to the first measured RSSI.

This disclosure describes a system for applying precise timing to a wireless mesh Wi-Fi network. The precise timing enables multiple access points (APs) to serve a single station (STA) when the STA is located within the wireless footprint of more than one access point, without requiring a wireless trigger frame. Several examples are described, including the use of OFDMA (Orthogonal Frequency Division Multiple Access), TDMA (Time Division Multiple Access), and the shared transmission of multiple access points.

A station (STA) is disclosed for performing orthogonal frequency division multiple access (OFDMA) uplink multi-user (UL MU) transmission. The STA includes a receiver to obtain a control frame from an access point (AP), the frame containing a broadcast address and multiple information fields, each linked to a different STA. These fields include an association ID (AID), subchannel assignment, error correction code type, modulation and coding scheme (MCS), and number of space-time streams. Upon identifying a matching AID, the STA's transmitter sends an OFDMA UL MU transmission, with a preamble composed of first and second parts. The first part spans the full bandwidth and includes training and signal fields; the second is confined to assigned subchannels. The STA may receive an acknowledgement (ACK) from the AP, potentially as a downlink OFDMA MU transmission.

In one embodiment, a wireless access point receives, from a mobile system, a broadcast beacon that includes a roaming notification indicating that the mobile system intends to roam to the wireless access point. The wireless access point allocates, after receiving the broadcast beacon from the mobile system, an orthogonal frequency-division multiple access resource unit for use by the mobile system. The wireless access point sends a trigger message to the mobile system that includes an indication of the orthogonal frequency-division multiple access resource unit. The wireless access point performs, after sending the trigger message, a handoff exchange with the mobile system using the orthogonal frequency-division multiple access resource unit to attach the mobile system to the wireless access point.

This invention relates to a method for transmitting and receiving data in a wireless communication system and a wireless communication terminal. A method for transmitting and receiving PPDUs in a wireless communication system is disclosed. A terminal receives a frame from an access point (AP) instructing one or more terminals to transmit a PPDU, and transmits the PPDU based on the AID12 subfield included in the frame. At this time, when the PPDU instructed to be transmitted by the frame is an Extremely High Throughput (EHT) PPDU, the value of the AID12 subfield is set to one of a plurality of values ​​other than at least one specific value, which is used to allocate resources for supporting at least one terminal with High Efficiency (HE) using Uplink Orthogonal Frequency Division Multiple Access (UORA).

This disclosure provides methods, devices and systems for generating packet preambles. Some implementations more specifically relate to preamble designs for special cases such as, for example, full-bandwidth multi-user multiple-input multiple-output (MU-MIMO), single-user (SU) preamble puncturing, hybrid automatic repeat request (HARQ), and multi-AP coordination. Multi-AP coordination may refer to coordinated beamforming (CoBF), joint transmission (JT), or coordinated orthogonal frequency division multiple access (C-OFDMA). Additionally, or alternatively, some implementations more specifically relate to preamble designs that accommodate signal fields of different cases.

A station (STA) receives, from an access point (AP) and via a primary channel (PCH), a first trigger frame indicating a first random access resource unit (RA-RU). The STA decrements a first orthogonal frequency division multiple access (OFDMA) backoff (OBO) counter for the PCH. The STA determines that a physical protocol data unit (PPDU) being received via the PCH comprises an inter-basic service set (BSS) PPDU. Based on the determining, the STA switches from the PCH to a non-primary channel access (NPCA) PCH. The STA initializes a second OBO counter for the NPCA PCH. In response to a second trigger frame, indicating a second RA-RU and received via the NPCA PCH, the STA maintains a value of the first OBO counter and decrements the second OBO counter.

A method performed by an access point multi-link device (AP MLD) to coordinate trigger-based uplink transmissions across multiple wireless links from a station MLD (STA MLD). The method involves determining an allocation of groups of frequency subcarriers to be used on each wireless link of the multiple wireless links for simultaneous uplink transmission from the STA MLD to the AP MLD; including, in a single trigger frame or in each of multiple trigger frames, information indicating the allocation of groups of frequency subcarriers to be used on each wireless link of the multiple wireless links; and transmitting the single trigger frame on one wireless link of the multiple wireless links, or the multiple trigger frames simultaneously across the multiple wireless links to the STA MLD.

To provide a communication device and a communication method that flexibly implement the use of OFDMA 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 so that at least some of the subcarriers are discontinuous on a frequency axis, 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 contiguously on the frequency axis, and the data is communicated by the OFDMA using the radio resources.SELECTED DRAWING: Figure 14

Embodiments of the present disclosure relate to the technical field of communications, and provide a communication method and apparatus, a device, and a storage medium, which can be applied to an access point (AP) device. The method comprises: determining a first message frame, wherein the first message frame comprises a first capability information element, the first capability information element comprises first identification information, and the first identification information indicates that the AP device supports non-orthogonal frequency division multiple access (non-OFDMA) uplink (UL) multi-user multiple-input multiple-output (MU-MIMO) communication on 640 MHz bandwidth; and sending the first message frame. The embodiments of the present disclosure can provide a communication mode that indicates a bandwidth supported in non-OFDMA UL MU-MIMO communication.

The ZC sequence packet multiplexing method comprises the following steps of: associating an AP (Access Point) and requesting STA packets for distributing ZC sequences, wherein the ZC sequences of each group of STAs are different, the ZC sequences of each group of STAs are the same, sending a PPDU (Protocol Data Unit) to the STAs, receiving ZC sequences which are sent by the STAs and are allowed to preempt a required STA in a TXOP packet, sending a TF (Trans Frequency) to the corresponding STAs according to the received ZC sequences, so that the corresponding STAs complete OFDMA (Orthogonal Frequency Division Multiple Access) according to an RU (Resource Unit) distributed by the AP, or the ZC sequences of each group of STAs are the same, and the ZC sequences of each group are different, and the PPDU is sent to the STAs. And receiving the ZC sequence sent by the STA with the demand, and sending the TF to the STA in the TXOP packet allowed to be preempted according to the received ZC sequence, so that the STA which is allowed to preempt the TXOP packet and has the low-delay data sending demand performs UORA, and the RU is preempted to complete OFDMA (Orthogonal Frequency Division Multiple Access). The problem that the number of ZC sequences does not meet the requirement of access equipment is solved, and the effect of meeting the requirement of multi-equipment access is achieved.