60 results about "Dynamic spectrum management" patented technology

A DSL system includes a multiple loop segment where K loops are bonded to provide a multiple loop segment having up to (2K−1) communication channels on which transmissions are vectored. The segment may be a drop to a customer premises, an inter-pedestal link, or any other suitable part of a larger DSL system. Generally the bonded loops are relatively short, being 300 meters or less. Signal vectoring is used to increase the speed and data carrying capability of the channels. In some embodiments, an expanded frequency spectrum also can be used to increase the data carrying capability of one or more of the channels. An impedance matching circuit may be coupled to each end of the segment to provided efficient transmission of data across the segment. A controller may provide control signals used to operate the segment as a vectored system and, if desired, frequency bandwidth control signals. The controller may monitor and/or collect data and information from the DSL system to assist in generating control signals. The controller can be a dynamic spectrum manager or DSM Center that includes a computer system and/or other hardware to assist in performing the required functions.

Techniques for managing detection, dynamic allocation, and sharing of available spectrum via cognitive radio systems and dynamic spectrum sharing. In some cases, RF carriers (e.g., secondary carriers or secondary cells) are not permanently assigned to base stations, user terminals, or the network. A base station can request allocation of secondary carriers using a reservation request. The assigned secondary carriers can be released and made available for assignment to another base station or radio access network.

A method, apparatus, and system for crosstalk test on multi-subscriber communication lines. The core of the invention is: loading a group of orthogonal spread spectrum codes to the transmitting side of each line, and testing the crosstalk of xSDL lines based on the received signal vector at the receiving side so that the source, amplitude, and phase of the crosstalk can be identified. With the invention, crosstalk test can be implemented in real time on xSDL lines without impacting the transmission performance of other lines. In addition, the test result shows how many lines have a significant impact on the line under test and reflects the severity of the impact, providing a powerful basis for dynamic spectrum management, and optimization of DSLAM system performance.

This invention discloses a dynamic spectrum management method, which increases a new dynamic spectrum management system under the radio management organization to realize re-usage of the un-used distributed spectrum by un-authorized users including a dynamic spectrum management center, a database for frequency used state, a spectrum monitor unit and a monitored actual use environment, the management center receives applications for spectrums of un-authorized users and assigned spectrums directed by the management rule, a spectrum monitor module monitors periodically the radio environment change and reports the result to the database, which records dynamically and provides data for frequency use state to the management center, the rule includes an application frame, its form, inquiry mode of database and distribution mode of spectrums, which applies the frame mode to transfer spectrum application and distribute information between the un-authorized users and the dynamic spectrum management system to realize automatic quick frequency application and distribution.

A crosstalk agent for integration in or connection to an access node (DSLAM) automatically gathers quantitative information indicative for the crosstalk coupling between lines (LINE1, LINE2, LINE3, LINE4) connected to the access node (DSLAM). The information may be extracted from an access node MIB each time the on/off state of a line changes, and optionally is used to group the lines in virtual binders. The crosstalk agent may optionally interface with service deployment or service upgrade experts, or with a dynamic spectrum management module in the access node (DSLAM).

A system and related methods for allowing for an increase in the use of spectrum resources through market based mechanisms for spectrum management. Spectrum trading mechanisms are implemented that allow for assignment and allocation decisions to be made by market forces. The system helps moderate an environment where buyers and sellers dynamically determine the assignment of spectrum and its uses.

A neighborhood multimedia sharing controller (NMSC) includes a dynamic spectrum management (DSM) management entity configured to allocate multimedia packets to available unlicensed frequency bands for use by a respective radio access technology (RAT) selected from several RAT physical layers, based on quality of service (QoS) requirements of multimedia applications. A network interface of the NMSC enables peer-to-peer communication with at least one other NMSC to coordinate a cluster of ad hoc network nodes based on detected common multimedia stream patterns.

Described herein is a silent period method and apparatus for dynamic spectrum management. The methods include configuration and coordination of silent periods across an aggregated channel in a wireless communication system. A silent period management entity (SPME) dynamically determines silent period schedules for channels based on system and device information and assigns a silent period duration and periodicity for each silent period. The SPME may reconfigure the silent period schedule based on system delay, system throughput, channel quality or channel management events. A silent period interpretation entity (SPIE) receives and implements the silent period schedule. The silent periods for the channels may be synchronized, independent, or set-synchronized. Interfaces for communicating between the SPME, SPIE, a channel management function, a medium access control (MAC) quality of service (QoS) entity, a sensing/capabilities database, a MAC layer management entity (MLME) and a wireless receive/transmit unit (WTRU) MLME are described herein.

A method for use in a Dynamic Spectrum Manager (DSM) for coordinating asynchronous silent periods in a network, the method comprising detecting a primary user in the network, transmitting a Silent Period Start Control Message to one or more cognitive radio (CR) nodes in the network, wherein the message indicates the start and duration of a silent period and initiates spectrum sensing,receiving a Measurement Report Control Message from the one or more CR nodes in the network indicating results of spectrum sensing, and transmitting a message to the one or more CR nodes, wherein the message instructs the one or more CR nodes to move to a different frequency based on the spectrum sensing results.

The invention relates to a dynamic spectrum management semi-physical simulation experiment system and method based on the USRP. The semi-physical simulation experiment system comprises a frequency spectrum management center, a dynamic frequency spectrum access network and cognition users, wherein each cognition user is composed of a computer, the USRP and an antenna. The method includes the steps that the cognition users send frequency utilization requests to the frequency spectrum management center, the frequency spectrum management center conducts frequency spectrum distribution according to local frequency spectrum resources and the frequency utilization condition, and the distribution result is sent to the cognition users through the USRP. By means of the system and the method, the dynamic frequency spectrum management can be achieved, idle frequency spectrums are effectively used, the frequency spectrum utilization rate is increased, the key sub-modules (algorithms) to which the dynamic frequency spectrum management is related can be verified, the time required for the development is shortened, cost required for the development are reduced, and a good promotion effect on the dynamic frequency spectrum management is achieved.

The embodiment of the invention provides dynamic spectrum managing method, apparatus, and system. The method comprises: receiving spectrum resource occupation information transmitted from a sensing device; determining a first spectrum resource occupied by a fixed authorized user, a second spectrum resource occupied by a unfixed authorized user, and a third spectrum resource not occupied by any user in a spectrum resource according to the spectrum resource occupation information; configuring a spectrum resource which can be utilized by a communication node according to the occupation information of the second spectrum resource and the occupation information of the third spectrum resource, wherein the first spectrum resource is an unavailable spectrum resource. According to the dynamic spectrum managing method, the information of the spectrum resources occupied by the fixed authorized user and the unfixed authorized user is acquired by the sensing device, and then the spectrum resource which can be utilized by the communication node is configured. Thus, the dynamic spectrum managing method may timely manage the spectrum resource which can be utilized by the communication node according to the occupation information of the spectrum resource.

Systems and methods for dynamic white space management are described. First, local handling of channel queries, in which a channel query by a white space device (WSD) is handled by a local dynamic spectrum management (DSM) server, if the DSM server has all the information necessary for providing a response to the channel query. Second, a search extension, in which a WSDB passes part of a search for available channels to a local DSM server. Third, assisting of an available channel calculation, in which a DSM server provides spectrum sensing information to WSDBs to improve the available channel calculation within the WSDBs. And fourth, dynamic bandwidth management to meet the coexistence requirements. In addition, the content of the messages and procedures that enable the above value-adding functions and interactions with the WSDB systems are described.

A wireless transmit/receive unit (WTRU) and a dynamic spectrum management (DSM) engine are described. The WTRU includes a transceiver, a radio frequency (RF) spectrum sensing unit and a processing unit. The transceiver transmits over a wireless link. The RF spectrum sensing unit measures information indicative of usage of a spectrum by other devices. The processing unit detects a change in performance of the wireless link. The processing unit also controls the transceiver to transmit a notification to a DSM engine indicating that the change in the performance of the wireless link was detected on a condition that the processing unit detects the change in performance of the wireless link. The processing unit also receives a sensing task request for the WTRU to measure the information indicative of the usage of the spectrum by other devices based on the notification transmitted to the DSM engine indicating that the change in the performance of the wireless link was detected.

The related database fit to dynamic frequency spectrum management comprises: a sub-database for initial state of the spectrum, a sub-database for entire state, a query sub-database, an analysis sub-database for cavity, a sub-database for cavity level label, a statistic sub-database for initial spectrum, an entire statistic sub-database, and a power gradient factor sub-database. This invention provides lots of query methods according to user request, and convenient to manage and maintain.

Provided is a spectrum management method for information proactive caching in a center multi-hop cognitive cellular network. The method comprises: establishing a system model, that is, a multi-hop cognitive cellular network model with information as center; establishing a markov decision process system with hidden and dynamic changing parameters; and performing spectrum management optimization. The method is aimed at solving a burst problem of network communication traffic and conversion of focus of users from a transfer file to obtaining interesting contents. Through the multi-hop cognitive cellular network architecture with information as the center and the dynamic spectrum management method, average hit probability of cache contents is improved, average hops required by users are reduced, and bandwidth is distributed to the most proper wireless link under the condition that unknown/varying network parameters and queue states in a router are considered, and meanwhile through the proactive caching method, contents which users may require in future are pushed to routers which are relatively close to the users, so as to improve integrated performance.

A method for line management includes: acquiring running parameters of a subscriber line; computing a transmitting power spectral density, PSD, and reference virtual noise of the subscriber line according to the running parameters; activating the subscriber line according to the transmitting PSD and the reference virtual noise. A device and system for line management are provided correspondingly. Reference virtual noise needed by virtual noise technology is set rationally according to the information provided by dynamic spectrum management, DSM, Level 2 algorithm. The utilization of the virtual noise technology improves the line stability under the DSM Lever 2 algorithm, and has an effect of optimizing the subscriber line.

The invention discloses a blending image transmission method in a recognition wireless multimedia sensor network. According to the method, multi-focus image collection is performed at a collection node; after a fusion node having a dynamic frequency spectrum management function adopts a quadtree structure and weighing region gradient energy based multi-focus fusion method for obtaining a fusion image, the fusion image is subjected to Fountain Code coding so as to generate data packets continuously; and the data packets are transmitted to a target node in a multi-hop self-organizing way through selecting an appropriate link in the recognition wireless multimedia sensor network. By adopting the above method, transmission of image data in the recognition wireless multimedia sensor network is realized, network data transmission volume and transmission energy consumption are reduced; at the same time, a user can acquire images with richer information content and higher definition.

The invention discloses a method for managing dynamic spectra on the basis of query on data of a database. The method includes steps of (1), updating the database; (2) enabling the database to compute Wprobability, Gprobability and Bprobability according to inserted contents; (3), enabling a dynamic spectrum management center to design a plurality of query processes according to parameters of unlicensed users and submitting one of query request to the database; (4), enabling the database to retrieve the data according to the query request to obtain a query result; (5), feeding the query result to the dynamic spectrum management center if the query result is normal, distributing the spectra and completing query, or changing a query process if the query result is abnormal or corresponding contents are not found by means of query, and turning to a step (6); (6), turning to the step (3) if the dynamic spectrum management center continues query, or completing query. The method has the advantage that the various query processes which can be selected by the dynamic spectrum management center are designed by the database according to the parameters of the unlicensed users, so that the spectra can be managed and distributed quickly and accurately by the dynamic spectrum management center.

Described herein are methods, apparatus and architecture for dynamic spectrum management (DSM) including protocol stacks, logical entities and functionalities that support DSM operation in opportunistic spectrum such as television white space (TVWS). The architecture supports aggregating bandwidth at the internet protocol (IP) layer over licensed and opportunistic bands as well as noncontiguous spectrum aggregation at the medium access control (MAC) layer. The control plane protocol stack includes a multi network transport protocol (MNTP), a channel management (CM) protocol, a policy protocol, a medium access control (MAC) entity, a physical entity and an air interface, all of which are configured to allocate, monitor, and update aggregated spectrum resources with respect to a DSM client.

The invention discloses a method for managing distributed dynamic spectrums in a digital subscriber line uplink system. By utilizing the characteristic that the interference of strong users on weak users is mainly at low frequency, redistribution is performed on the strong subscriber by utilizing bit movement based on bits subjected to iterative water injection predistribution. Due to the fact that each modulator-demodulator maximizes self data transmission rate and neglects crosstalk disturbance on other users when the bits are subjected to the predistribution through an iterative water injection method, the strong users seriously interfere the weak users, the data transmission rate of the weak users is low, and then serious unfairness is caused. According to the method, the bits loaded in low-frequency sub-channels of the strong users are transferred to high-frequency sub-channels as many as possible through the bit movement, so that the crosstalk disturbance is effectively inhibited, the data transmission rate of the weak users is maximized while the requirement of a target data transmission rate of the strong users is met, and the data transmission rate of the digital subscriber line system is increased.

The invention discloses a resource optimization method for reducing power consumption of a broadband access network, comprising the following steps of: constructing an effective dynamic spectrum management module of energy, and introducing restrain factors for inhibiting users which are greedy to load bit numbers and have better performances, so as to obtain an optimization module; then utilizing a duality theory and introducing a Lagrange variable to obtain a Lagrange duality module of the optimization module; then constructing a price table for quantifying a compensation relation of bit number loading of different users to obtain the restrain factors; and finally, obtaining the minimum total signal power capable of meeting low limit restriction conditions according to the restrain factors. The resource optimization method provided by the invention has the advantages that: the appropriate restrain factors are selected only by utilizing a transmission speed of target data and a line performance, without participating in an iteration process, so that the complexity of the operation is greatly reduced; meanwhile, the power consumption of the method is very close to that of an effective frequency spectrum balance algorithm of the energy, so that an energy-saving and emission-reducing target of green communication is met and the method has better realizability.

The embodiment of the invention provides a method and a device for dynamic management of a frequency spectrum. The method comprises the following steps in sequence: determining a reusable frequency spectrum of one of a plurality of cell links in the network based on the common-frequency indicating information, wherein the common-frequency indicating information is used for indicating the reusable degree of the frequency spectrum of each of the plurality of cell links to other cell links; and updating the frequency spectrum configuration of one of the plurality of cell links by using the reusable frequency spectrum of one of the plurality of cell links. According to the method and the device for the dynamic management of the frequency spectrum, provided by the embodiment of the invention, the reusable frequency spectrum of the special cell link can be determined according to the common-frequency indicating information, and the frequency spectrum configuration of the special cell link can be partially adjusted, thus the capacity of the network can be improved, the interference among the cells can be reduced, and the cost on the frequency spectrum configuration can be reduced as well.