775results about How to "Reduce the probability of collision" patented technology

A method for multiplexing communication resources to multiple users in a communication system having no network resource planning. The method includes the steps of: generating a generic time-frequency (T-F) mapping pattern (TFPgeneric), generating a set of orthogonal T-F mapping patterns from said generic T-F mapping pattern (TFPgeneric), performing a random variable cyclic offsetting of said set of orthogonal T-F mapping patterns in each transmission time interval (TTI), and allocating the orthogonal T-F mapping patterns to the one or more users and / or traffic channels in each TTI. A transmitter for executing said multiplexing method, and a system including such transmitters, are also disclosed.

An improved apparatus for controlling a traffic signal at an intersection includes a signal controller having an artificial intelligence based situational analyzer. The signal controller receives vehicle data related to the speed and position of vehicles approaching the intersection, and optionally time and ambient condition data. If the artificial intelligence based situational analyzer predicts a signal violation, operation of the traffic signal is modified to reduce the probability of a vehicular collision.

The present invention relates to a method and system (10) for distance determination of RF tags (4) and its applications based on measuring the round trip delay, avoiding deterministic collisions between a plurality of wide band response signals transmitted by the tags (4) by adding a pseudo-random time delay to the wide band response signal, and iteratively reducing the collision probability between plurality of wide band response signals.

An improved apparatus for controlling a traffic signal at an intersection includes a signal controller having an artificial intelligence based situational analyzer. The signal controller receives vehicle data related to the speed and position of vehicles approaching the intersection, and optionally time and ambient condition data. If the artificial intelligence based situational analyzer predicts a signal violation, operation of the traffic signal is modified to reduce the probability of a vehicular collision.

The present invention relates to a method and system (10) for distance determination of RF tags (4) and its applications based on measuring the round trip delay, avoiding deterministic collisions between a plurality of wide band response signals transmitted by the tags (4) by adding a pseudo-random time delay to the wide band response signal, and iteratively reducing the collision probability between plurality of wide band response signals.

A method and apparatus are described including multicasting a medium reservation message, receiving responses to the medium reservation message and determining if a ratio of the received responses to an expected number of responses exceeds a threshold. Also described are a method and apparatus including receiving a medium reservation message, determining if the medium reservation message specifies this receiver in a list of receivers from which a response is requested, determining if a medium is idle and transmitting the response to the medium reservation message responsive to the second determination.

The present invention is directed toward methods and systems for data de-duplication. More particularly, in various embodiments, the present invention provides systems and methods for data de-duplication that may utilize a vectoring method for data de-duplication wherein a stream of data is divided into “data sets” or blocks. For each block, a code, such as a hash or cyclic redundancy code may be calculated and stored. The first block of the set may be written normally and its address and hash can be stored and noted. Subsequent block hashes may be compared with previously written block hashes.

The invention discloses a resource determining method for a physical random access channel. The method comprises the step of configuring a plurality of physical random access channel resources for each piece of user equipment (UE), and the physical random access channel resources include at least one of the following resources: time domain resource, frequency domain resource, code domain resource and space domain resource, wherein the time domain resource is emission sub-frame configuration of a physical random access channel, the frequency domain resource is emission band configuration of the physical random access channel, the code domain resource emission sequence or orthogonal mask configuration of the random access channel, and the space domain resource is space access location configuration of the random access channel. The invention further discloses a resource determining device for a physic al random access channel. The PRACH resource reusing capability in a frequency division duplex system is improved, the PRACH collision probability is reduced, and the terminal access efficiency and the system throughput are improved.

A novel topology sensing methodology is provided for point-to-point link setup among a set of network nodes, which are mobile. The technique provided is TDMA contention-based, where each network node sends pilot signals to announce its existence. Pilot signals transmitted by network nodes are used by surrounding nodes to extract various pieces of information such as node identity, node location and potential link quality. Information collected from pilot signals of neighboring nodes is used in conjunction with other topological criteria to identify the best set of nodes with which a given node should establish links. The topology sensing methodology avoids duplexer problems and attempts to achieve minimum collision by allowing the nodes to continually monitor available pilots and transmit on the least-interference channels. The topology sensing methodology can also optionally make use of GPS information, when available, in order to provide an accurate map for communicating nodes and improve the link setup process.

A system and method for remotely monitoring and / or controlling an apparatus and specifically for remotely monitoring and / or controlling street lamps. The lamp monitoring and control system comprises lamp monitoring and control units, each coupled to a respective lamp to monitor and control, and each transmitting monitoring data having at least an ID field and a status field; and at least one base station, coupled to a group of the lamp monitoring and control units, for receiving the monitoring data, wherein each of the base stations includes an ID and status processing unit for processing the ID field of the monitoring data.

A method and apparatus for mapping and detecting control channel are provided. The method for mapping a control channel includes: for the same aggregation level, according to a signaling length of a control channel corresponding to a component carrier, determining a corresponding search space for at least two control channels that have the same signaling length, so as to enable the at least two control channels that have the same signaling length to use the same search space, and mapping the at least two control channels that have the same signaling length to the determined corresponding search space. Therefore, conflicts between the control channels are reduced, and the number of times of blind detection of the control channels is also reduced.

The invention discloses a slotted CSMA-CA (carrier sense multiple access with collision avoidance) backoff algorithm based optimization method. Priority settings are introduced to enable important command frames and short data frames of a sending node to be sent as soon as possible and data frames to be all sent at one time as soon as possible, and nodes used for channel competition and time delay caused by competition are decreased; the receiving and incorporating process of the frames is confirmed, success or not in sending is judged, and the communication process is more complete; a dynamic adjustment macMinBE method is adopted, the BE initial value is set, and adaptive adjustment is performed according to network load, idle and busy conditions of channels of previous task transmission and success or not in task sending; when the channels are busy, the value of macMinBE is increased, and probability of data collision can be reduced; when the channels are idle, the value of macMinBE is decreased, backoff time is shortened, time delay is reduced to a certain extent, power consumption is lowered, and network throughput is increased.

The invention provides a configuration method of channel state information, a feedback method of the channel state information, a base station and a terminal. The feedback method of the channel state information includes the steps that a terminal side receives a configuration instruction sent by a base station side, and the terminal side feeds back an RI and / or a precoding type indicator, a precoding matrix indicator and a channel quality indicator to the channel state information of a plurality of non-zero-power channel state information reference signal resources configurated with the same interference measurement resources according to the configuration instruction, wherein the RI and the PTI are same, and the PMI and the CQI are independent. According to the technical scheme, the same RI and / or the PTI are fed back to the channel state information of the non-zero-power CSI-RSs configurated with the same IMRs, the rules for uplink feedback are simplified and unified while uplink feedback expenditure is greatly reduced, and the collision probability of uplink channel state information feedback is reduced.

The present invention relates to a radio communications system and a radio communications method, and an object of the invention is to readily reduce the occurrence of collisions of contention channels. In order to achieve the object, radio resources are assigned in different orders between one radio communication and another one radio communication.

The invention discloses a method for increasing the random access success rate under a competition mode, a system and a device thereof. A UE in an LTE system can be randomly connected under the competition mode, wherein after UE transmits an MSG3 message to a base station e Node B according to UL- Grant distributed by a random access response message, the equiprobability random selection of the UE could be retransmission or waiting if the UE receives NACK feedback, if selecting the retransmission, the MSG3 message can be retransmitted in a current retransmission subframe, if selecting the waiting, the coming of a next retransmission subframe could be waited for. The invention can be applied for guaranteeing the random access success rate when the load of a district is overlarge, reducing the delay of services, and improving the performance of the LTE system.

The adjust method for main and auxiliary carrier for multi carrier sub zone in TD-SCDMA system comprises: selecting a carrier as main carrier and the other as auxiliary carrier; creating sub zone, activating the TSO and DwPTS of main carrier to shield the auxiliary's and configure the public channel on main carrier; the P-CCPCH of main carrier uses full-direction coverage mode, all UE receives broadcast information from main carrier; detecting the power, disturbance and load of main carrier to evaluate the available resource of main carrier; when there is carrier has larger available resource, switching the main and auxiliary carrier. The invention can accommodate user both for main and auxiliary carrier with less collision possibility and high success rate.

The invention discloses a time frequency two-dimensional hybrid media access control (MAC) layer access method. In the two-dimensional direction of a frequency domain and a time domain, multiple users can compete with an available resource together, wherein the available resource comprises each sub channel and different time slots. Conflict is avoided by adopting a withdrawal mechanism, and the users are accessed to a wireless channel to transmit data by competing with the available resource and combining a reservation mechanism. The frequency resource and the time resource are simultaneously utilized in the method, and the competition and the reservation mechanism are combined, so that the utilization rate of the system channel is improved; and the conflict is avoided, so that the throughput of the whole system is effectively improved.

A connection controlling method of integrating a time synchronous code division multiple access with a automatic-organizing network belongs to the mobile communication field of the communication technology, based on keeping the unitive air interface of TD-SCDMA honeycomb network physic frame invariable construction, the method is a multi-channel synchronization connecting control method based on the preset pattern and distributing pattern control, the time span resource is divided into the control channel and the data channel by the OVSF (Orthogonal Variable Spreading Factor), thus improving the time span reusability through terminal to terminal status to expose the terminal problem, the method maintains the time span status of node within two jumps time span, and realizes the conflict-free wireless connection within two jumps time span; thereby solving the problems of realizing the conflict-free visit time span and performing the reliable alternation communication under integrating network and multi-communication modes.

The invention provides a wireless Mesh intelligent power grid routing mechanism NQA-LB with QoS perceiving and loading balancing. The mechanism comprises four steps: firstly differentiating intelligent power grid service flows with different QoS requirements through an EDCA mechanism, and calculating the frame error rate of different service flows according to the data packet collision rate of the EDCA mechanism; secondly, calculating data packet queuing delay with different priorities of the queue length of forwarding node cache and the successful transmission probability of data packets; then designing the routing metric of QoS perceiving and loading balancing by comprehensively considering the data frame error rate and queuing delay of different service flows, and selecting an optimal path with less load for the service flow with different QoS demands; finally dynamically adjusting the data packet priority on an MAC layer according to network total loading and loading conditions of all priority service flows. The mechanism can more accurately perceive the link quality of the MAC layer, guarantees the QoS demands of different service flows of a power grid, further increases the data packet delivery rate and average throughput capacity, and reduces the end-to-end delay of all service flows.

One embodiment of the present invention provides a system that facilitates registration of remote nodes in an Ethernet passive optical network (EPON). The system includes a central node and at least one remote node, wherein a number of virtual remote nodes are coupled to a common physical remote node and transmit upstream data through a common transmitter within the common physical remote node. During an initial discovery cycle, the system receives a solicitation message from the central node at a remote node, wherein the solicitation message assigns a discovery slot in which an unregistered remote node may transmit a response message to the central node for registration. The system then transmits a response message from an unregistered remote node to register within the assigned discovery slot. If multiple virtual remote nodes coupled to the common physical remote node seek registration concurrently, the system controls the transmission of response messages from these virtual remote nodes to the central node so as to avoid collisions between response messages from different remote nodes.

A method for allocating transmission channels to devices configured to communicate short data packets to a diversity of non geostationary satellites is disclosed hereby. The method suggests a dynamic cellular partitioning of the earth surface, based on the smallest intersections of overlapping satellite service areas (“footprints”), defined as mega-cells, and reusing channels in different mega-cells. In addition, a transmission cycle is defined and divided to time slots, synchronized at each device by GPS timing signals, and mega-cells served by more satellites are allocated with fewer time slots, in order to increase the chance of transmitters placed in mega-cells served by fewer satellites to be detected. Further, each mega-cell is divided to cells, and different channels and time slots are allocated to each cell, from those allocated to the corresponding mega-cell. Consequently, collision of transmissions from different mega-cells is reduced, and collision of transmissions from different cells in a mega-cell is avoided.

Provided are a radio transmission device and a radio transmission method, which prevent the deterioration of a preamble detecting performance while reducing the collision probability of a RACH. In this radio transmission device, a Signature table storage unit (103) divides the magnitudes of transmission loss levels into individual levels corresponding to the distances from a base station, to cause CAZAC series and circulation shift quantities to correspond to each other at the individual levels, and is provided with a table containing a plurality of Signatures created from the CAZAC series and the circulation shift quantities caused to correspond to each other. A Signature selecting unit (104) selects one of the corresponding Signatures at random from the Signature table storage unit (103), on the basis of the magnitude of the transmission loss level outputted from a transmission loss level deciding unit (102). A RACH signal generating unit (105) generates the RACH signal with the Signature selected.

The invention provides an intelligent obstacle avoidance system and method of an autonomous vehicle and belongs to the field of automatic driving. An automatic guided vehicle cannot realize complete autonomous obstacle avoidance under an existing wharf scene so that the transporting efficiency is low. According to the intelligent obstacle avoidance system of the autonomous vehicle, an obstacle detection device, an obstacle trajectory prediction sub system, a vehicle decision sub system and a data collection device are mounted on the autonomous vehicle; an obstacle vehicle coordinate detected by the obstacle detection device is transmitted to an obstacle trajectory prediction algorithm model trained by the data collection device; and a future trajectory of an obstacle is predicated according to a history trajectory of the obstacle; the vehicle decision sub system makes decision according to the future trajectory predicated by the obstacle trajectory prediction algorithm model, performscalibration according to the possible position of the future trajectory of a vehicle and bypasses the calibrated position. According to the intelligent obstacle avoidance system and method of the autonomous vehicle, an obstacle vehicle can be avoided with a better effect. The collision probability of the autonomous vehicles is reduced, and the passing efficiency of the autonomous vehicle under thewharf scene is enhanced.

The invention discloses a self-adaption multiple-relay selection method in a terminal through communication system. The method comprises the steps that the received signal to noise ratio of a destination node D is estimated; whether introducing relays is necessary is judged; the interference of each relay on a base station is calculated; according to priority, ordering is carried out on all relays; according to relay ordering, the relays are taken out in turn; whether the relays are optional relays is judged, so as to acquire an optional relay set. According to the method provided by the invention, several relay selection schemes in a D2D communication system are provided to adapt to different system environment requirements; collision probability optimization is carried out; and the D2D communication system can achieve the best performance on the basis that cellular communication is not affected.

The invention discloses a random access method. The method comprises the following steps: sending access request information by a receiving terminal at a network side, wherein the access request information comprises a lead code and a sub-identifier; according to the lead code and the sub-identifier, identifying the terminal; and when the terminal is successfully identified, accessing the terminal. The method effectively reduces the collision probability, improves the accurate accessing rate of the terminal and increases the access number of the terminals which a cell can support. The invention also discloses a random access system, the terminal and access equipment at the network side.

The invention discloses a telligent dry separator (TDS). The telligent dry separator is characterized in that an intelligent identification method is adopted for establishing corresponding analysis models according to different characteristics of coal quality, through big data analysis, digitalized identification is conducted on coal and gangue, and finally the gangue is discharged through an intelligent execution system. The telligent dry separator (TDS) comprises four major systems, namely a feeding system, a material distribution system, an identification device and an execution mechanism, and three auxiliary systems, namely an air supplying system, a dedusting system and an electric control system. By means of the telligent dry separator (TDS), separation precision can be improved, the lower separation limit can be further lowered, and a condition is created for achieving the effect that all block raw materials ranging from 3mm to 300 mm adopt the intelligent dry separation process. Compared with traditional cleaning equipment, the telligent dry separator (TDS) has the advantages that on the aspect of construction investment, a system can be simplified, investment can be reduced, and the construction period can be shortened; on the aspect of separation effects, precision can be guaranteed, the heat value can be raised, and no coal slime is generated; on the aspect of production cost, consumption can be lowered, maintenance can be reduced, and manual work can be decreased.

A time synchronization method in a wireless sensor network, a low power routing method using a reservation scheme, and an apparatus for performing the method are provided. The time synchronization method in the wireless sensor network may include: receiving a first synchronization request command packet from a parent node that manages time synchronization for a predetermined synchronization region; receiving, from the parent node, a second synchronization request command packet that has a transmission timestamp value of the first synchronization request command packet; and performing time synchronization for a child node based on a reception time of the first synchronization request command packet, a reception time of the second synchronization request command packet, and the transmission timestamp value of the first synchronization request command packet.

The utility model relates to a distributed contention control backoff method for wireless local network based on probability P, belonging to the wireless communication technology. The method is based on the basic idea of executing backoff on the basis of nodes; by executing carrier monitoring mechanism, the nodes estimate the network congestion status; the time slot utilization ration is calculated according to the time slot number when the channel is busy and the total time slot number passed in the backoff process, and the congestion degree probability P is thereby determined; a value of the contention window of the nodes is arranged according to the value of the probability P and the node random number; each time after the nodes is sent successfully, the probability P is used to judge whether the contention window is turned into the minimum value; therefore, unnecessary collision is avoided. When collision occurs in the channel, the value of the contention window is doubled until the maximum value is achieved; then the value of a backoff counter is determined according to the contention window, and the collision of the network data is thereby controlled. The utility model is based on the present IEEE802.11 standard protocol, and no other hardware requirement is needed; the utility model is in complete distribution mode; the throughput, the time delay and other functions of the utility model are all superior to the prior backoff methods.

An organic electroluminescent device (OELD) is provided. The OELD includes a substrate, a first electrode, a second electrode, a hole transport layer, an electron transport layer and two emissive layers. The first electrode and the second electrode are disposed over the substrate. The hole transport layer is disposed between the first electrode and the second electrode. The electron transport layer is disposed between the second electrode and the hole transport layer. The emissive layers are disposed between the hole transport layer and the electron transport layer. One of the emissive layers is a fluorescent emissive layer and another one of the emissive layers is a phosphorescent emissive layer. The visible light of the fluorescent emissive layer and the phosphorescent emissive layer are not absorbed by each other and the visible light spectrums of the fluorescent emissive layer and the phosphorescent emissive layer are not affected by each other.

The invention relates to a circulating tumor cell detection chip and an application thereof. The above micro-fluidic chip is combined with deterministic lateral displacement and specific bio-affinity identification principles to realize synergistic high-efficiency and high-purity capturing and detection of circulating tumor cells in peripheral blood. A triangular microcolumn array modified with affinity identification molecules, such as a nucleic acid aptamer or antibody, and having a specific geometric arranging shape, is designed in the micro-chip. The rotating angle, the distance, the offset angle and other parameters of triangular arrays are regulated to control the flow behaviors of different dimensions going through micro-channels. The chip can realize three functions in order to improve the capture efficiency and the purity of the circulating tumor cells. A gas-driven sample introduction system is also designed in the invention, and can realize simultaneous control of a plurality of fluid paths through one gas pressure path.