36results about How to "Reduce detection delay" patented technology

The present invention provides a method and device for sending and receiving synchronization signals, and a transmission system, wherein the method includes: the base station determines one or more sets of system parameters, wherein each set of system parameters includes frequency information of the carrier frequency and / or The frame structure parameters of the carrier frequency; the base station constructs a synchronization signal of a predetermined structure according to the system parameters; the base station sends the synchronization signal to the terminal; wherein, one or more sets of system parameters correspond to the same predetermined structure. The present invention solves the problem of excessive complexity in detecting synchronous signals in the related art.

The embodiment of the invention provides a method and a device for detecting a physical broadcast channel. The method comprises the following steps of: collecting first wireless frame data; performing physical broadcast channel detection on the first wireless frame data; and finishing the current detection if the physical broadcast channel information is detected. By applying the embodiment of the invention, when the data is less than 40ms, the required physical broadcast channel (PBCH) information can be acquired by traversing and analyzing data at different positions in a PBCH Buffer. Undernormal condition, the PBCH information can be detected in 10ms, so the detection delay is greatly shortened, and guarantee is provided for other service operation, such as user equipment (UE) accessing, switching and the like.

The invention discloses an integrated detection method of edge side clone nodes based on backpropagation neural network, comprising the following steps: S1. Edge side computing nodes collect data sets; S2. Use the data sets to train and test BPNN; S3. Wait New information packet; S4. Extract channel information from the information packet, store reference channel information, and calculate channel difference; S5. Accumulate the reputation of each node; S6. Input the reputation of each node into BPNN to determine whether there is a clone attack; S7 . If there is no cloning attack, update the reference channel information, and if there is a cloning attack, send a cloning attack alarm. The invention utilizes BPNN at the edge side nodes to perform integrated detection on the data source nodes, and simultaneously judges whether there is a clone attack in multiple nodes, improves the detection efficiency of the clone nodes, and reduces the network transmission load and the central network load. The present invention also reduces the influence of channel random noise and improves the accuracy of clone node detection by accumulating reputation and BPNN classification.

The invention proposes a DDoS attack detection method based on a software-defined network, which is used to solve the technical problems of low accuracy and high delay when detecting DDoS attacks in an SDN network in the prior art. The implementation steps are: constructing a software-defined network DDoS attack detection architecture of the network, each OpenFlow switch S in the data layer m Receive data packets and forward them, the packet capture module in the SDN controller captures data packets and forwards them, the stream data processing module in the SDN controller obtains stream data sets, and the DDoS attack detection module in the SDN controller obtains DDoS attack detection result. The software-defined network-based DDoS attack detection framework and DDoS attack detection module adopted by the present invention detect DDoS attacks by combining entropy and network self-similarity, which can significantly improve the accuracy of DDoS attack detection and reduce time delay.

The present invention discloses a method for increasing the detecting efficiency of the ascending synchronous code in a time division synchronization code division multiple access system. The high layer of the network allocates an access service grade and synchronous code and the corresponding information of the ascending pilot channel UpPCH sub-channel to the terminal when the small area is accidentally accessed. The node B is allocated with an ascending pilot channel UpPCH sub-channel and a corresponding synchronous information. The terminal transmits the corresponding ascending synchronouscode on the sub-channel corresponding with the access service grade itself and initializes an ascending synchronization process to a node B. The node B confirms an UpPCH sub-channel number according to the system sub-frame number and only detects the ascending synchronous code which is allowed to be transmitted in the UpPCH sub-channel in an ascending pilot frequency time slot of a sub-frame. Theinvention leads to that the NodeB assures the number of the synchronous code to be detected and the specific synchronous code sequence through improving the allocation of the high layer. The probability of time delay of detection and error judgment is reduced, and the detecting efficiency is improved.

A cognitive radio spectrum sensing method belongs to the technical field of cognitive radio and relates to CUSUM fast detection technology. By further improving the non-parametric CUSUM detection algorithm and applying it to spectrum detection, the present invention can overcome the shortcomings of existing fast detection methods and detect signals more quickly and at low cost under the conditions of no signal prior knowledge and random signal appearance time. And the offset can be dynamically adjusted according to the detection situation, so that the detection delay can be further reduced.

A method and a device of preamble configuration. The method includes acquiring the identification information of preambles corresponding to a cell. The preambles corresponding to the cell include contention preambles and non-contention preambles. The non-contention preambles include useful non-contention preambles and useless non-contention preambles. According to the identification information, the corresponding contention preambles and useful non-contention preambles are confirmed. The reference root sequence information for creating the contention preambles and the useful non-contention preambles are obtained. According to the reference root sequence information, reference root sequences are generated. The method and device can only obtain the reference root sequence information that generates the contention preambles and the useful non-contention preambles, and thereby generate the reference root sequences only related to the contention preambles and the useful non-contention preambles. The method and device avoid detecting the root sequences of all preambles supported by the cell after receiving a preamble signal. The method and device save resources, reduce detection time delay, and thereby reduce the terminal connecting time delay and switching time delay.