14 results about "Aloha" patented technology

The present disclosure relates to a device and method for supporting slotted ALOHA for ambient Internet of Things (Ambient IoT) communication in a wireless communication system. Specifically, the present disclosure relates to a device and method for supporting enhanced slotted ALOHA schemes for ambient IoT system in ambient IoT communication.

This invention introduces an energy-efficient communication protocol for Ambient IoT, integrating Slotted ALOHA with RF energy harvesting to enable reliable interaction between ultra-low-power, battery-less devices and 5G / 6G base stations or relay UEs. Devices first harvest energy from a Carrier Wave (CW) signal, followed by a structured five-message exchange (Msg0–Msg4) handling synchronization, random access, data transmission, and acknowledgments. Time-frequency resources are dynamically allocated based on device energy levels and random IDs, reducing collisions and improving throughput. Control signals use differential encoding for robustness. Each message is framed with a preamble and postamble, allowing the device to detect the start and end of the signal. Padding is inserted before the preamble to ensure alignment with NR OFDM symbol boundaries. A Slotted ALOHA-based retransmission strategy enhances channel reuse. Eliminating dedicated RFID readers, this approach supports long-range, interference-managed communication, offering a scalable, low-latency, and cost-effective solution for massive machine-type communication (mMTC) in next-generation Ambient IoT networks.

The invention provides an end station batch access method based on a TDMA (Time Division Multiple Access) satellite system, which is applied to a far-end station in a star-shaped satellite TDMA system network and comprises the following steps of: receiving a DLTD (Data Link Transfer Database) broadcasted by a central station through a modulator forward link; whether the onoff in the received DLTD is 1 or not is judged, if not, login is randomly initiated according to a time slot ALOHA mode, if yes, whether deviceid of the remote station exists in a remote station identification sequence or not is checked, if yes, whether the ith login time slot in the super-frame count sfCount meets the condition for initiating login access or not is judged, if the condition is met, login access is initiated in the login time slot, and if not, login is not performed. According to the scheme, remote stations can be accessed in batches, a large number of remote stations can be accessed in a short time, and the problem of rapid online of a large number of remote stations is solved.

The invention discloses a data sending method and device and electronic equipment. The method comprises the following steps: determining a data frame between any two time slot starting points in a time slot access control protocol; a network congestion level and a terminal identifier are obtained, the network congestion level is used for reflecting the network congestion degree of the network side, and the terminal identifier is an identity identifier temporarily allocated to the terminal device by the network side; and determining the number of time slots for delayed transmission of the data frame according to the network congestion level and the terminal identifier, and transmitting the data frame according to the number of time slots. According to the method and the device, the technical problem of high data frame collision probability when the number of the terminals is large in the time slot ALOHA protocol of the Internet of Things is solved.

The invention discloses a multi-slot spread spectrum random access method and a multi-slot spread spectrum random access system for satellite short message communication. According to the method, a micro time slot structure is set on a satellite uplink, a user terminal estimates propagation time delay and pre-compensates a sending moment by using GNSS information, and spread spectrum signals with the duration being integral multiples of a micro time slot are generated for cross-time-slot discretization transmission. Compared with a standard time slot spread spectrum ALOHA, the signal overlapping density at the synchronization moment is remarkably reduced through a discretization mechanism, and on the premise of maintaining microsecond-level synchronization precision, the capturing pressure of a receiver and the strict requirement for spread spectrum code orthogonality are effectively relieved; compared with pure spread spectrum ALOHA, the method has the advantages that the channel resource utilization rate and the system throughput performance are obviously improved under medium user concurrent load; and meanwhile, the capability of flexibly adapting to the variable-length message is realized, and the optimal balance among the system capacity, the engineering cost and the service flexibility is realized.

Systems, methods, and instrumentalities are described herein that may be associated with early data transmission in enhanced coverage using diversity slotted aloha in non-terrestrial networks. A device may be configured to receive broadcast configuration information. The broadcast configuration information may include a first condition and a second condition. A first coverage level may be determined based on whether the first condition is satisfied. A random-access configuration associated with the first coverage level may be selected based on the broadcast configuration information and based on whether the second condition is satisfied. Based on a determination that the random-access configuration enables a preamble-less early data transmission (EDT), the WTRU may determine at least at one physical uplink shared channel (PUSCH) resource allocation parameter. The random-access configuration and the PUSCH at least one resource allocation parameter may be transmitted using the preamble-less EDT.

The application provides a satellite-to-ground two-step random access enhancement method based on irregular repeated time slot ALOHA, which comprises the following steps: step one, random access flow method design; step two, preamble design and timing detection; step three, receiver demodulation and interference cancellation process; and step four, simulation verification and performance evaluation. The application designs a satellite-to-ground two-step random access system level method by introducing irregular repeated time slot ALOHA strategy, double preamble sequence (2-rooted PRACH preamble) detection technology, orthogonal pilot channel estimation technology and continuous interference cancellation technology. The simulation results show that the method can improve the throughput of satellite-to-ground random access, significantly reduce the access delay, and improve the access speed and access capacity.

The present disclosure provides a method and system for energy- aware random access scheduling and resource allocation in wireless networks comprising ambient Internet of Things (IoT) devices. A paging signal is broadcast by a network entity, defining a time-frequency contention grid used by ultra-low power, battery-less devices to transmit random access messages via a slotted ALOHA protocol. Each message includes a unique device identifier, energy status, and message size. The network processes these messages to detect contention outcomes and allocates communication resources accordingly. Devices receiving acknowledgment (ACK) proceed with uplink transmission, while those receiving negative acknowledgment (NAK) reattempt access based on a probabilistic backoff scheme with a retry limit. The number of contention slots is dynamically optimized based on network load, latency goals, and energy constraints to minimize collisions and improve scalability. The invention enables efficient, fair, and low-power communication in dense IoT deployments, particularly within massive Machine-Type Communication (mMTC) scenarios in 5G and 6G networks.

This invention discloses a method and system for optimizing the energy efficiency of LoRa networks considering coding rate, belonging to the field of network optimization technology. The method mainly includes: constructing a LoRa performance model considering coding rate based on LoRa network parameters and the non-slotted ALOHA protocol; performing energy-aware sorting configuration initialization to obtain a priority list; performing asymptotic probability constraint allocation to obtain an initial spread factor and coding rate combination for each node; and performing neighborhood refinement search to obtain a refined spread factor and coding rate combination. Implementing the LoRa network energy efficiency optimization method and system considering coding rate provided by this invention can enhance the scalability of LoRa networks and further improve energy efficiency.

Disclosed are methods, systems, and computer-readable medium to perform operations including: selecting, from a resource pool, a first time and frequency resource for sending a first random access message replica of a random access message instance; selecting, from a resource pool, a second time and frequency resource for sending a second random access message replica of the random access message instance; and sending the random access message instance including the first replica on the first time and frequency resource and including the second replica on the second time and frequency resource.

The invention provides a large-scale random access method based on asynchronous enhanced time slot ALOHA. The large-scale random access method comprises the following steps: step 1, establishing a system basic framework and a frame structure; 2, signal coding modulation and sending transmission are carried out; step 3, oversampling operation; step 4, iterative soft cancellation signal detection; 5, time slot level interference elimination operation is carried out; step 6, an iterative solution process is carried out; and 7, performing simulation verification and performance evaluation. According to the invention, an oversampling technology is utilized to effectively solve the intra-symbol asynchronization phenomenon between users in an enhanced ALOHA-based random access mechanism. Meanwhile, a corresponding over-sampling signal iteration soft elimination detection algorithm is designed, and the recovery of the over-sampling signal can be effectively realized. According to the scheme provided by the invention, the user asynchronization phenomenon can be effectively resisted, and meanwhile, the access throughput of the system can be improved by utilizing the gain generated by the asynchronization phenomenon.

The invention belongs to the technical field of satellite communication, discloses a circular polarization modulation-based NOMA-ALOHA protocol method under imperfect CSI (Channel State Information), and provides a binary circular polarization modulation-based NOMA-SA scheme for solving the problem of insufficient utilization of polarization dimensions of an existing NOMA-SA system. According to the modulation scheme, the orthogonal characteristics of the LHCP and the RHCP are utilized, so that user signals with the same power level can be decoded through polarization diversity, and the system capacity is remarkably improved. In order to solve the influence of channel estimation errors on performance in an actual system, CRLBs of channel estimation are deduced in TDD and FDD modes respectively. By establishing an equivalent noise model, the influence of the channel estimation error on the system performance is quantified. In order to accurately evaluate the performance of the system, the upper bound of the throughput of the system is deduced by considering two favorable scenes of monopolization of a single user and coexistence of orthogonal polarization users. The analysis model reveals the cooperative gain of polarization diversity and power domain multiplexing, and provides a theoretical basis for system parameter optimization.

The invention provides an irregular repeated time slot ALOHA protocol method based on multi-packet reception, which belongs to the technical field of wireless communication, introduces a multi-packet reception capability MR on the basis of a traditional IRSA protocol, and relaxes a decoding condition from a conflict-free condition to a condition that the number of conflict data packets is less than or equal to MR, thereby reducing the number of iterations of decoding, and improving the decoding efficiency. And the data packet transmission capability of the system can be improved, the decoding capability, throughput and packet loss rate performance under high channel load can be improved, and the performance superior to that of a traditional random access protocol can be obtained in a massive machine communication scene. The scheme is verified through actual experiments, and the superiority of the scheme is shown.

A wireless communication method is disclosed. The method comprises transmitting, by a wireless communication terminal to a wireless communication node, one or more first messages via a contention-based access mode based on configuration information from the wireless communication node, wherein the contention-based access mode comprises: a Slotted ALOHA, SA, a Diversity Slotted ALOHA, DSA, a Contention Resolution Diversity Slotted ALOHA, CRDSA, an Orthogonal Cover Code based Slotted ALOHA, OCC-based SA, an Orthogonal Cover Code based Diversity Slotted ALOHA, OCC-based DSA, or an Orthogonal Cover Code based Contention Resolution Diversity Slotted ALOHA, OCC-based CRDSA.