37 results about "Spectrum availability" patented technology

A spectrum sensing method for cognitive radio to detect spectrum holes in an environment of bandwidth scarcity. The method comprises first receiving a wireless signal at a cognitive radio user, and then discovering the frequency edges of allocated frequency bands by using wavelet transform coefficients to detect discontinuities in the power spectral density of the received signal. After determining the allocated frequency bands, the method determines frequency band availability by detecting the in band energy using a bi-threshold energy detector, where the energy detector makes hard decisions and soft decisions. Finally, a fusion center combines hard and soft decisions collected from a cooperative spectrum sensing network of cognitive radio users and makes a final decision using a hybrid of data fusion and decision fusion to determine the final decision regarding spectrum availability.

A method and transceiver for determining spectrum availability within a give area is disclosed. The given area includes cells in a grid. A belief evaluator receives a measurement from a signal and assigns an instantaneous belief indicator, an instantaneous disbelief indicator and an instantaneous ignorance indicator based on a detection threshold and the power level of the measurement. The indicators quantify the probability of a presence of a transmitter within the grid cell. A belief accumulator uses the instantaneous indicators along with accumulated belief, disbelief and ignorance indicators from previous measurements to determine cumulative belief, disbelief and ignorance indicators. The accumulated belief, disbelief and ignorance indicators are the results of previous measurements and belief/disbelief/ignorance determinations for the grid cell. An allocator indicates the status of the grid cell and whether a spectrum is available. If a spectrum is available, then the grid cell is added to other available cells within the area to generate the spectrum hole.

The invention relates to a spectrum sensing-based single-path service partitioning-merging spectrum allocation method in an elastic optical network. An algorithm consists of two parts, when a new service arrives, a spectrum availability-based service-divisible spectrum allocation method is used to allocate spectrum resources for the service, n spectrum blocks with the largest total residual frequency availability of links of a path that the service passes in occupation are selected to transmit the service, the residual spectrum availability of the links is maximized as much as possible, and the blocking rate of a network is reduced; and when an old service leaves, bandwidth resources are released, a spectrum availability-based service merging method is used, whether idle spectrum blocks large enough to satisfy a bandwidth requirement of service merging exist in the path that services under transmission in a partitioned manner pass is inquired, and spectrum availability of links is not reduced after merging, and if the bandwidth requirement is satisfied, the services are merged. The spectrum sensing-based single-path service partitioning-merging spectrum allocation method aims to reduce spectrum resource waste caused by service splitting and too much use of an equipment port, further reduce the blocking rate of the network, and save energy consumption of the equipment port.

There is provided a system and a method for a GSM operated handset or access point to turn power on and off and change transmit/receive parameters via GSM device and network. A GSM device is always on while other wireless devices maybe kept power off or in inactive mode. GSM device will turn on/off other devices and instruct them to change transmit and receive parameters according to services availability and radio resource usage policies. Database sever/severs will be equipped for both GSM device and GSM network so that GSM device can aware the services availability and spectrum availability for other devices such as HSPA, 1xEVDo, WiFi, LTE, WiMax, ATSC, DVB-T, DVB-H, etc. A GSM device may turn multiple devices on and enables multiple networks to communicate with a GSM operated handset.

A spectrum management server generates and an electronic device uses a channel map solution for a predetermined travel route of the electronic device. The channel map solution includes at least one available channel for each of the plural geographic areas through which the planned travel route passes. At least two adjacent ones of the geographic areas have different channel availability.

A spectrum-aware rate selection includes finding a set of channels based on spectrum availability information such that the total required spectrum for a requested data rate of a traffic demand is minimized.

The invention relates to an implementation method of a pilot-assisted detector for DVB-T signals in a cognitive radio network. Most countries in the world use DVB-T as the signal standard for ground digital televisions, the nodes in a cognitive radio network acquire spectra-available information on the wave band of the digital television signals mainly by means of spectra perception, and therefore, the research into spectra perception methods for DVB-T signals has significant value. The invention provides a pilot-assisted detector for DVB-T signals. Firstly, a processing unit in the detector strengthens the periodic pilot components in a DVB-T signal received by a secondary user through the sum of product movements but inhibits other components; and secondly, a combination and judgment unit in the detector combines the outputs of the processing unit and judges whether a master user signal exists. The theoretical analysis and the simulation result indicate that the detector is free from the effects of multidiameter Rayleigh fading, can differentiate the master user signal from interference under the conditions of no synchronizing information and low signal-to-noise ratio, and enhances the detection performance.

The invention belongs to the technical field of optical fiber communication, and relates to a path protection method based on spectrum availability and protection bandwidth sharing sensing in an elastic optical network. The method comprises a single-path transmission stage and a multi-path transmission stage. The single-path transmission stage comprises the following steps: firstly, reducing spectrum fragment durations by distinguishing business durations and through different spectrum distribution modes; and secondly, optimizing a protection link cost function according to different sizes of shared spectrum blocks, so that the protection bandwidth sharing degree can be increased. The multi-path transmission stage comprises the following steps: according to different business protection bandwidth requirements, adopting different multi-path transmission strategies in a self-adaptive manner to minimize the number of consumed frequency slots; and introducing a shared path protection mechanism into multi-path protection to reduce the usage of idle frequency slots. Finally, following dynamic establishment and removal of light paths in the network, spectrum allocation for a business protection path may not be carried out based on the maximum sharing degree. Through a protection bandwidth reconfiguration strategy, the protection width sharing degree can be increased, and the spectrum allocation for the protection path can be optimized.

The invention discloses a flow rate distribution method and device of cognitive wireless self-organizing network multipath routing so as to reduce the influences of dynamic variation of data traffic arrival rate and node service speed rate on end-to-end service quality in the cognitive wireless self-organizing network. The method comprises the following steps of: the path number between a source end secondary user and a target end secondary user of end-to-end data transmission by adopting a multipath routing algorithm is obtained; the source end secondary user collects the service speed rate and spectrum availability ratio of each hot node, and generates a path list of the multipath routing according to the service speed rate, the spectrum availability ratio and a multipath routing protocol of each hop node on each path; and the traffic distribution optimal issue is converted into the convex optimization problem for solving a lagrangian multiplier and the traffic of each path distributed to the path list through a lagrange method, and transmission is carried out by adopting optimization speed rate on each path in the path list according to iteration solved results by a reduced gradient method. The embodiment of the invention improves the end-to-end transmission performance and efficiency.

A method for performing mobility-measurements in new radio (NR) based 3GPP mobile communication network is provided. The method includes receiving network information with respect to a geographical area from one or more user equipments (UEs) operating in geographical area for a predefined duration of time. The received network information is classified at various time-instants during the predefined duration of time as at least one of an NR spectrum availability and NR spectrum non-availability. An overall probability of availability of the NR spectrum within the area is calculated for a time-instant subsequent to the predefined duration of time based on the classified network information. The UE is enabled for scheduling NR measurements within the area based on the calculated probability.

The invention discloses a dwelling channel selection method for solving the deaf problem of a cognitive radio wireless network and belongs to the technical field of cognitive radio wireless electric networks. The method mainly comprises that: according to a sensed spectrum hole and the intercepted dwelling channel selection information of neighboring nodes, each node selects an available channel, which is not collided with the dwelling channels of the neighboring nodes within a two-hop range by using a distributed method, as a dwelling channel for performing control information interaction and service channel negotiation with other nodes; and when the dwelling channels of the nodes within the two-hop range collide due to the appearance of a main user, the movement of a node or the like, a dwelling channel selection process is restarted to select a new dwelling channel. The method can effectively improve the route reconstruction condition caused by communication interruption and deaf problem resulting from the dynamic change of the availability of frequency spectra in the cognitive radio wireless networks. The method is suitable to be used in the cognitive radio wireless networks, distributed multi-hop networks, wireless local networks, next-generation heterogeneous network and other places.

The invention discloses a spectrum defragmentation trigger method based on spectrum sensing in an elastic optical network. The spectrum defragmentation trigger method comprises the following steps that step (1): the spectrum availability before defragmentation and the business demand degree are calculated; step (2): the spectrum availability before defragmentation and the business demand degree are compared, and spectrum defragmentation is not required when the spectrum availability before defragmentation is greater than or equal to the business demand degree; and the spectrum availability after defragmentation is calculated when the spectrum availability before defragmentation is less than the business demand degree, and the step (3) is performed; and step (3): the spectrum availability after defragmentation is compared with the business demand degree, and the spectrum defragmentation mechanism is triggered when the spectrum availability after defragmentation is greater than or equalto the business demand degree; and spectrum defragmentation is not required when the spectrum availability after defragmentation is less than the business demand degree. The spectrum defragmentation trigger method has the advantages of increasing the success rate of network business transmission, reducing network business blocking rate and enhancing the network resource utilization efficiency.

The invention provides a spectrum allocation method based on spectrum resource prime number division in an elastic optical network, which comprises the following steps: dividing spectrum resources on each link in the network into K types of prime number blocks, wherein the number of frequency pieces contained in different types of prime number blocks is different; when the number of the frequency chips required by one connection request is integer multiples of a certain prime number block in the K types, distributing the prime number blocks of the corresponding types; otherwise, adding one frequency sheet to the number of frequency sheets required by the connection request to enable the number of frequency sheets to be integral multiples of a certain prime number block in the K types, and then distributing the prime number blocks of the corresponding types. According to the method, the spectrum resources are divided into the prime number blocks, so that the spectrum resources on different links are arranged more orderly, multiple types of connection requests are allowed to share one type of prime number blocks, the types of prime number blocks needing to be divided are reduced, and finally, the effects of increasing spectrum availability and reducing the blocking rate of the connection requests are achieved.

The present invention relates to the field of wireless communication technologies, and in particular to a network device, a terminal, and a method for determining the availability of a communication spectrum, so as to solve the problem that when a network device does not effectively sense another network device and uses its communication spectrum to communicate with a terminal, There may be a problem with interference from another network device. The network device provided by the embodiment of the present invention includes: a transceiver module, configured to send control information to the target terminal, and notify the target terminal to measure the first spectrum, and for the network device, the first spectrum is an unlicensed spectrum; and receive the measurement reported by the target terminal Feedback information obtained from the first frequency spectrum; a processing module configured to determine whether the first frequency spectrum is available according to the feedback information received by the transceiver module. Since the terminal measures the unlicensed first spectrum, it can be more accurately judged whether other network devices are using the unlicensed first spectrum, so as to effectively avoid interference from other network devices.

The invention provides a spectrum allocation method and system. The spectrum allocation method comprises the steps of: based on a source node and sink nodes of services, constructing a small-particle-size service group; constructing a continuous spectrum plane for the small-particle-size service group; and according to the continuous spectrum plane, allocating spectrum resources. According to theinvention, the small-particle-size service group is constructed by carrying out classification on the services, the services with path similarity are partitioned into the same group to be subjected touniform routing and spectrum allocation so as to reduce complexity of service bearing, and continuous spectrum allocation is carried out on the basis of the small-particle-size service group so as toeffectively reduce generation of spectrum fragments and improve spectrum availability of an elastic optical network.