367 results about "Idle channel" patented technology

Electronic apparatus and method are provided for management of communications between channel master (e.g. audio player), responding device (e.g. remote control / headphones) and, optionally, passive devices (e.g. headphones) wirelessly connected in a wireless audio network. The channel master transmits, and the responding device receives, audio signals and network management information. Profile negotiation means communicates application profiles for the devices, establishing at least one application profile which is common to them and designating a selected, common application profile for use in associating the devices. Channel selection means selects a channel for the communications using an ordered selection of channels (PCS) obtained from scanning the channels for idle channels and ordering the scanned channels according to priority based on channel quality. Normalized control and status interfaces establish interoperability between devices which use different data streams to communicate in the network.

A method and system for use with wireless communication systems having a cellular architecture with at least a first and a second cell. The method and system provided ensure near uniform capacity and quality of channels within the second cell via the following steps. The noise signal power in unused data channels within the second cell is monitored. When a request for channel access is received, a determination is made whether the request for channel access is either a request for handoff from the first cell into the second cell, or not. In the event that the request is not a request for handoff, a determination is made whether idle channels exist to satisfy the request for channel access. In the event of a determination either that the request for channel access is a request for handoff, or both that the request is not a request for handoff and that idle channels exist to satisfy the request, a measured received signal power of a mobile unit subscriber unit making the request is determined. One of the unused channels in the second cell is then preferentially assigned to the mobile subscriber unit where such preference in assigning is to assign a channel, provided that a signal to noise ratio calculated upon the monitored received signal power and the monitored noise signal power of the preferentially assigned noisy channel meets or exceeds a required signal to noise ratio.

The embodiment of the invention discloses a method for using DRX in a non-authorized frequency band. The method comprises the steps of configuring non-continuous received DRX parameters for UE to obtain the DRX activating time and the DRX sleeping time of the UE; sending the DRX parameters to the UE; setting information of CCA detection time of an idle channel of the UE at the non-authorized frequency band; sending the first indication information to the UE to indicate the UE to wake up at the CCA time in the non-authorized frequency band so as to monitor the channel of the non-authorized frequency band; sending the data according to the CCA time of the UE at the non-authorized frequency band, and the DRX activating time and the DRX sleep time of the UE. According to the technical scheme, the method has the advantages that the UE can effectively monitor the channel of the non-authorized frequency band while the power consumption of the UE at the non-authorized frequency band is reduced; the LTE device and the WiFi device can fairly share the resources in the non-authorized frequency band.

The embodiment of the invention discloses a channel detection method of an unauthorized frequency band and network cell equipment, which are used for reducing the detection collision and achieving coexistence in justice among LAA cells of different operators. The method provided by the embodiment of the invention comprises the following steps that the network cell equipment detects that whether the channel of the unauthorized frequency band is idle or not in the CCA detection time frame during target channel idle estimation, wherein the target CCA detection time frame is contained in a CCA detection time window which at least comprises N CCA detection time frames, and at least two different operators use the different CCA detection time frame in the N CCA detection time frames; when the detected channel is idle, the network cell equipment performs data transmission based on the idle channel.

A method, apparatus, and computer program product of interfacing a time-domain multiplexed (TDM) link with a cell-switched network. The TDM link supports one or more active channels and one or more idle channels and supplies TDM frames with a sample of each channel in a dedicated timeslot. The TDM link is terminated at a first network node. One or more idle timeslots are removed from each TDM frame to create a compressed TDM frame, where each idle timeslot carries a sample of an idle channel. One or more compressed TDM frames are loaded in a cell that is sent over the cell-switched network to a second network node. The compressed TDM frames are unloaded from the cell. Idle timeslots are inserted in the compressed TDM frames to restore the compressed TDM frames to complete TDM frames. The bandwidth of the cell switched network is efficiently utilized because idle channel samples are not carried over the cell-switched network. In one embodiment, the TDM link is a T1 link that carries T1 frames, and the cell switched network is an Asynchronous Transfer Mode (ATM) network that carries ATM cells.< / PTEXT>

In retransmission processing due to a failure of transmission of data packets, a plurality of data packets are simultaneously transmitted between two STAs by utilizing multiple wireless channels and MIMO, and the number of idle channels and the number of retransmission packets are compared. Then, when both of the numbers are different or only when the number of idle channels is larger than the number of retransmission packets, the retransmission packets are reconstructed according to the number of idle channels, and the reconstructed retransmission packets are simultaneously transmitted by using the idle channels.

The embodiment of the invention discloses an authorized frequency band channel occupation time configuration method comprising the steps that subframe configuration of a TDD LTE system is acquired; an indicating message of idle channel detection CCA time of an authorized frequency band is received, and the indicating message of CCA time includes the indicating message of uplink CCA time and the indicating message of downlink CCA time; and channel occupation time in the authorized frequency band is determined according to the subframe configuration and the indicating message of CCA time, and data transmitting and data receiving are performed according to channel occupation time. With application of the technical scheme, a UE is enabled to determine uplink channel occupation time and downlink channel occupation time according to the indicating message of CCA time and the uplink and downlink subframe configuration so that data transmitting is performed within uplink channel occupation time or a receiver is shut down within non-downlink channel occupation time and thus the objective of saving electric energy consumption of terminals can be achieved.

The invention provides a frequency spectrum access method using communication of a selected idle authorized channel in a cognitive radio network. The method comprises the following steps: periodically perceiving a plurality of authorized channels and recording channel states which comprise a busy / idle state, utilization rate and waiting time by using each secondary (non-authorized) user in the cognitive radio network; and interacting control frames by the secondary users at transceiving two ends, calculating the maximum time that the secondary users can be accessed to the idle channels according to the utilization rate of the idle channels in the current network, selecting the idle authorized channel capable of transmitting maximum traffic, and performing communication between the secondary users on the selected channel. The method can solve the problems of a 'hidden' terminal and an 'exposed' terminal at the same time.

The invention discloses a carrier sense method and a system. According to the method, a transmitting terminal sends an idle channel to assess clear channel assessment (CCA) request frames on a main channel of a transmission channel which needs to be detected; the transmitting terminal sends request to send (RTS) frames on the transmission channel which needs to be detected after sending a point coordination function inter-frame space (PIFS) subsequent to transmission of the CCA request frame; and the transmitting terminal performs data transmission on the transmission channel transmitting clear to send (CTS) frames after receiving an indication that CTS frames are permitted to send. The invention also discloses the carrier sense system, which comprises a transmitting terminal and a receiving terminal. According to the method and the system, the power consumption of the receiving terminal is reduced and reliable CCA results of all transmission channels are provided.

Associated systems and methods for providing data services using idle cell capacity in a communications system. The systems and methods assign priorities to each remote user device in the communications system. In response to a request for service for a remote user device, the switch determines whether an idle channel is available for the remote user device. If no idle channel is available, the switch determines whether a remote user device with a lower priority than the requesting remote user device is using a channel. If a lower priority remote user device is using a channel, its call is terminated and the channel is assigned to the requesting remote user device. If no lower priority remote user device is using a channel, the request for service is put into an ordered queue to wait for the next available idle channel.

In retransmission processing due to a failure of transmission of data packets, a plurality of data packets are simultaneously transmitted between two STAs by utilizing multiple wireless channels and MIMO, and the number of idle channels and the number of retransmission packets are compared. Then, when both of the numbers are different or only when the number of idle channels is larger than the number of retransmission packets, the retransmission packets are reconstructed according to the number of idle channels, and the reconstructed retransmission packets are simultaneously transmitted by using the idle channels.

A cognitive radio system and method for clear and idle channel survey in Wireless Local Area Network (WLAN) are disclosed. Through computing average value of Received-Signal-Strength-Indicator (RSSI_AVG) in each channel, clear channels without interference from other RF devices can be distinguished in the present system and method. Based on an actual WLAN setup, a further AP has a larger possibility to be an idle and clear AP. In the present system and method, searching available channels from furthest AP to nearest AP therefore helps to reduce time of channel survey through repeated rises of signal strength threshold.

The invention relates to a method for sharing channels, comprising the following steps of: A. distributing an idle registration channel for a cognitive user; B. detecting whether an authorized user appears or not, if the authorized user appears, distributing the registration channel for the authorized user, and measuring an interference temperature threshold for ensuring that the authorized user normally uses the registration channel, acquiring the maximum available power of the cognitive user according to the interference temperature threshold, and if the authorized user does not appear, continue to detecting; and C. calculating whether the cognitive user can carry out data transmission or not by using the maximum available power, if so, regulating the transmitting power of the cognitiveuser, and if not, switching the cognitive user to the idle channel. Moreover, the invention also relates to a system for sharing channels. The method and the system for sharing channels judge whetherthe cognitive user can carry out data transmission or not by using the maximum available power to control the action of the cognitive user, which greatly reduces the frequency spectrum switching efficiency, improves the frequency spectrum use ratio and network performance and meanwhile also improves the effective data transfer rate.

The invention discloses a method and a device of remote uderwater acoustic communication. The device comprises more than one underwater communication nodes and more than one abovewater communication buoys which are responsible for communication with more than one underwater communication nodes within a set distance range through an underwater acoustic channel; and the communication connection is carried out between the abovewater communication buoys through a land wireless channel. In the method, the multi-frequency band combination is adopted to sent data in parallel, and the remote communication is realized by uniting the communication buoys; in the remote communication, a three-time handshake protocol in the carrier sense multiple access (CSMA) needs not to be used in the communicationbetween the underwater communication nodes and the buoys, while a channel can be directly monitored in a full frequency range; the data are synchronously sent to the abovewater communication buoys inparallel on each subchannel on the monitored idle channel by utilizing a frequency modulation method; and the data is transmitted by the abovewater communication buoys through a radio wave manner. Bythe method and device provided by the invention, one-time successful transmission probability of the two parties of the communication can be improved, and the anti-interference performance of a system is enhanced.

Data packets are transmitted between two STAs capable of using plural radio channels and MIMO together, by using idle channels and MIMO. When at least one idle channel has been detected, plural data packets are generated in the same number as the sum of MIMO numbers of the respective idle channels, in which the data packets are generated from one or plural data frames, and plural data packets having the same packet time length are transmitted simultaneously between the two STAs by using the idle channels and MIMO.

The present invention includes systems and methods for estimating interference levels on idle channels in an unsynchronized TDMA or GSM wireless network. Each of s time slots is divided in to n distinct or overlapping segments. The interference level within each segment for each time slot is then measured and stored. In each subsequent frame in a predetermined accumulation interval T, the interference level within each segment of each time slot is measured and averaged with the measurements of the corresponding segment and corresponding time slot in previous frames. The maximum of the average interference measurements in all segments of all time slots yields increased accuracy for an interference measurement on the physical channel.

The invention provides a method for positioning PU of cognitive radio networks. The method comprises the following steps: acquiring a plurality of detecting results on the PU based on MAC communication protocol through an idle channel capable of perceiving at least three SU of the PU within certain time slot; and based on the plurality of the detecting results in the last step, calculating and determining the position of the PU by an iterative algorithm of weighting least squares. The method has the advantage that the method acquires location algorithm-based positioning precision by utilizing a little information without basing on the location algorithm, and further improves the performance of positioning algorithm by introducing the iterative algorithm of weighting least squares. The deduction of Cramer-Rao theory performance limit and a plurality of imitations prove that the positioning error of the method is extremely similar to Cramer-Rao limit theory performance.

An embodiment of the invention discloses a dynamic frequency hopping access method and apparatus which can detect idle channel. When detected idle channel is occupied by identification user apparatus, usable frequency congregation composed of said idle channel is determined, and channel is selected from said usable frequency congregation for composing frequency hopping congregation. The frequency hopping list is generated according with said frequency hopping congregation, and frequency hopping communication is processed according with channel of said frequency hopping list applied to said frequency hopping congregation. When detected idle channel is full idle channel, fixed frequency can be processed by using detected full idle channel. The method and apparatus can reduce cost of system access, and increase system safety obviously at the same time reducing access collision, and has better access fairness; so access effectiveness can be increase, also user satisfaction degree can be increase obviously.

A cognitive radio system and method for clear and idle channel survey in Wireless Local Area Network (WLAN) are disclosed. Through computing average value of Received-Signal-Strength-Indicator (RSSI_AVG) in each channel, clear channels without interference from other RF devices can be distinguished in the present system and method. Based on an actual WLAN setup, a further AP has a larger possibility to be an idle and clear AP. In the present system and method, searching available channels from furthest AP to nearest AP therefore helps to reduce time of channel survey through repeated rises of signal strength threshold.

The embodiment of the invention discloses an idle channel determination method and idle channel determination equipment based on beams. The method comprises the steps of detecting channel energy in afirst beam direction via a beam-based receiving antenna, wherein thresholds of channel detection energy in the beam directions with different coverage angles are different, and the threshold of the channel detection energy in the first beam direction is in reverse proportion to the coverage angle of the first beam, then comparing an acquired first energy value with the threshold of the channel detection energy in the first beam direction, and if the first energy value is less than the threshold of the channel detection energy in the first beam direction, accurately determining that a first alternative frequency band in the first beam direction is idle. According to the method, the different corresponding channel detection energy thresholds are used for the different beams, so that the accuracy of channel direction in each beam direction is greatly improved, and thus spectrum efficiency of the unauthorized spectrum in each beam direction is improved.

The invention discloses a wireless communication system idle channel detection method and a wireless communication system idle channel detection system. The wireless communication system idle channel detection method is characterized in that channel measurement of channels required by beam forming transmission data can be carried out, and the channels in the idle state can be determined. The wireless communication system idle channel detection system comprises a channel measuring module, which is used for channel measurement of the channels required by the beam forming transmission data; and an idle channel determining module, which is used for determining the channels in the idle states according to the channel measurement result. The data transmission probability of the transmission stations can be improved.

Associated systems and methods for providing data services using idle cell capacity in a communications system. The systems and methods assign priorities to each remote user device in the communications system. In response to a request for service for a remote user device, the switch determines whether an idle channel is available for the remote user device. If no idle channel is available, the switch determines whether a remote user device with a lower priority than the requesting remote user device is using a channel. If a lower priority remote user device is using a channel, its call is terminated and the channel is assigned to the requesting remote user device. If no lower priority remote user device is using a channel, the request for service is put into an ordered queue to wait for the next available idle channel.

The invention provides a channel selection method and device. The method includes the following steps that statistical information of all channels is obtained one by one, wherein the statistical information of each channel comprises a channel load of the channel and idle channel power of the channel; statistical information of a current basic service set (BSS) is obtained periodically, wherein the statistical information of the current BSS comprises a node maximum sending queue length and a node maximum sending delay; whether the statistical information of each channel and / or the statistical information of the current BSS meet / meets triggering conditions is judged; if the statistical information of each channel and / or the statistical information of the current BSS meet / meets the triggering conditions, the sum of throughput rates of each channel serves as a capacity parameter of each channel, and the channels are ranked according to the capacity parameters of the channels from high to low; the channel where the current BSS is located is switched to the channel ranked the highest. A channel selection mode based on channel capacity is achieved, the requirement for the bandwidth of APs in the channels can be better met by conducting channel selection from the aspect of the channel capacity, and a better communication effect is achieved.

This invention relates to an audio test system and a method of mobile communication terminals, in which, the sytem includes: a radio communication base station simulator, an audio test analyzer, a system control platform, a noise eliminating chamber, a preamplifier and an acoustic simulation device, said method includes test to the evaluation values of transmission loudness and receiving loudness, noise of idle channels, transmission flexibility / frequency character, receiving flexibility / frequency character, evaluation value of side sound mask, loss of stability, echo control of acoustics and T-R distortion, and also includes evaluation value of side sound mask, out-of-band signals and suppression to environmental noise of listeners.

A wireless communication apparatus for performing wireless communication using at least one of the first channel having the first frequency band, and the second channel having the second frequency band which is wider than the first frequency band includes a channel search device which executes the first channel search for the bandwidth of the first frequency band and the second channel search for the bandwidth of the second frequency band, and obtains a search result indicating an idle channel, and a determination device which determines a channel to be used on the basis of the search result obtained by the channel search device.

The invention discloses a spectrum cooperation method in a dynamic frequency hopping wireless regional area network, which comprises the steps that: all CPEs in the WRAN carry out spectrum detection and feed related idle channel information back to a respective control base station; spectrum resource distribution of the WRAN system under the state of spectrum collision is determined by high priority WRANs. The spectrum cooperation method of the invention is applied to solving the problem of spectrum collision among all overlapping WRANs based on dynamic frequency hopping, thereby effectively ensuring that all WRAN systems, when ensure respective QoS, effectively avoid serious problems of non-realization or relatively long delay of wireless access, etc. of adjacent WRANs caused by the shortage of free idle channels. Therefore, the communication quality and reliability in the coverage scope of the whole WRAN area are improved effectively by the same operator when integrating the whole spectrum resources.

The invention provides a system and method for realizing I2C bus expansion by using a CPLD. The system comprises a BMC, a CPLD and a slave device. The method comprises the steps that firstly, the BMCcommunicates with the CPLD through a front-end I2C bus, and an internal register of the CPLD is configured through addressing action of the CPLD; Then, the configuration logic module analyzes the configuration data of the front-end I2C and outputs a control signal and a channel selection signal; and the channel control logic module establishes mapping between the front-end I2C wire and the rear-end I2C bus according to the control signal and the channel selection signal output by the configuration logic module. And finally, the BMC accesses the slave device connected with the rear-end I2C bus.Through the method, the device and the system, The CPLD is used for expanding the I2C bus, the hardware cost is reduced, the occupied PCB area is reduced, the circuit structure is simplified, the number of the expanded I2C paths can be configured according to the number of slave devices, no waste idle channel exists, the I2C address of the CPLD is 7-bit configurable, and the I2C address conflictis reduced.

A method for selecting one channel from a plurality of channels in a wireless network system is disclosed. The channels include at least one in-use channel, a first idle channel, and a second idle channel. The method includes comparing the frequency band of the in-use channel with the frequency band of the first idle channel and the second idle channel to determine a first reference value for the first idle channel and a second reference value for the second idle channel, and comparing the first reference value with the second reference value to select one from the first idle channel and the second idle channel.