51results about How to "Promote coexistence" patented technology

Disclosed are systems and methods which provide interference mitigation by making alternative resources available within areas served by wireless communication links. Embodiments provide multiple channel availability in establishing wireless communication links to facilitate interference mitigation. Time domain techniques, spatial processing techniques, and / or frequency domain techniques may be implemented for spectrum management. Embodiments provide wireless base station configurations in which all or a plurality of base station sectors use a same frequency channel and / or in which each sector or a plurality of sectors use all frequency channels. Multi-channel strategies may be implemented such as to provide dynamic selection of a “best” frequency channel, to provide transmission of identical data on multiple channels for combining / selection at the receiver, and / or to provide for dividing the data for transmission on multiple channels.

A flexible OFDM / OFDMA frame structure technology for communication systems is disclosed. The OFDM frame structure technology comprises a configurable-length frame which contains a variable length subframe structure to effectively utilize OFDM bandwidth. Furthermore, the frame structure facilitates spectrum sharing between multiple communication systems.

A transmitter for transmitting data as a pulsed ultrawide band signal comprises a serial-to-parallel converter (54) for converting the signal to be transmitted to a parallel sequence, a modulator (64) to convert the parallel sequence to a parallel stream of impulse trains. A delay unit (60) delays the parallel streams of impulse trains by different time intervals within the same pulse repetition period. The delayed pulse streams are combined so that the pulses in the streams occur within the pulse repetition period of a single pulse. An antenna (52) is used to transmit the combined signal. A receiver comprises an antenna (72) for receiving a transmitted pulsed ultrawide band signal having two or more interleaved pulse trains with equal pulse repetition periods, the pulse repetition period being greater than the pulse spacing in the interleaved signal. A matched filter filters the received signal, the filter being matched to the pulse shape of the received signal. A low-pass filter (74) is coupled to the matched filter and an analogue-to-digital converter (76) is coupled thereto. A serial-to-parallel conversion unit (78) is coupled to the converter (76) to sample the digital signal at a rate greater than the pulse repetition frequency of the received signal. A signal processor (80) is coupled to the serial-to-parallel conversion unit (78) to produce an output signal representative of the received data.

The present invention relates to a method for selecting operating frequency channels having frequency parameters, such as a frequency interval or at least one carrier frequency, for a network communicating data over a shared medium. The network is configured to communicate within a frequency range, and the frequency range is divided into a plurality of frequency channels f1-fn, each frequency channel defines a predetermined frequency parameter. The data to be communicated over the network is divided into sequences FS, each sequence having a plurality of positions SP1-SPm. The method further comprises regularly scanning the frequency range to identify interfering frequencies generated by interfering networks operating within said shared medium, and assigning a frequency channel fk to each position SPi within the sequences FS based on the identified interfering frequencies, whereby the use of interfering frequencies is limited.

A method for reducing interference between FDD and a TDD interfering radio networks including identifying respective radio entities for which the interferences should be reduced; defining a time pattern comprising time slots on each of the interfered channels, and receive time intervals for radio entities that may be interfered, and aligning the time patterns so that receive time intervals for the radio entities that are potentially exposed to interferences, overlap each other. The radio entity that might create interference to the radio entity of the pre-defined type of the other network, is prevented from transmitting communications that might create e substantial interference to the radio entity associated with the other radio network, and communications transmitted to some radio entities of the pre-defined types that might experience interference, are scheduled at intervals in which communications are received with substantially reduced interference.

A wireless smart utility network (Wi-SUN) device participating in a Wi-SUN network for coexistence with a Wi-Fi HaLow network sharing frequency spectra between the networks is provided. The Wi-SUN device includes a receiver to receive packets of neighbor Wi-SUN devices, a memory configured to store computer executable programs including a hybrid carrier-sense multiple access with collision avoidance (CSMA / CA) control program and Wi-SUN backoff control program, a processor configured to execute the hybrid CSMA / CA control program including instructions that steps of estimating a severity of Wi-Fi Halow interference based on one or combination of the severity metrics, selecting a CSMA / CA mode between predetermined CSMA / CA modes in response to the estimated severity, detecting a channel status based on the hybrid carrier-sense multiple access, wherein if the channel status is not idle, a maximum limited number of times for re-attempting a packet transmission is checked to determine an allowability of re-attempting the packet transmission, and a transmitter to transmit packets according to a determination result of the allowability.

This disclosure relates to using a wake up signal in conjunction with cellular communication in unlicensed spectrum. A cellular base station may provide a wake up signal on an unlicensed frequency channel after successful completion of a listen-before-talk procedure. The wake up signal may include a preamble configured for coherent detection, and information indicating channel occupancy time for acellular communication by the cellular base station and a cell identifier for the cellular base station. A wireless device may monitor the unlicensed frequency channel for a wake up signal, and may determine whether to monitor the unlicensed frequency channel for control channel signaling based on whether a wake up signal is received, and potentially also based on the contents of the wake up signal if a wake up signal is received.

Described herein are a method and apparatus including calculating an aggregate peak total traffic demand for all overlapping access points in an interference range, comparing the aggregate peak total traffic demand to a threshold, rejecting a requested new quality of service traffic stream responsive to results of the comparison, calculating a peak total traffic demand for each overlapping access point in the interference range if the requested new quality of service traffic stream is admissible responsive to results of the comparison, comparing the peak total traffic demand for each overlapping access point in the interference range, if the requested new quality of service traffic stream is admissible, to the threshold and one of accepting the requested new quality of service traffic stream and rejecting the requested new quality of service traffic stream responsive to results of the second comparison.

Transmit power control functionality in wireless audio systems may be implemented by way of a Transmit Power Control (TPC) algorithm devised to control power for both source and sinks in a multi sink session, to reduce power consumption. Information may be passed back and forth between the source and sink devices to adjust power based on the shared information. The TPC algorithm may allow power control on both ends of an RF link, and may have multiple sink devices communicating with a source device. Furthermore, the multiple sink devices and the source device may each be operating at different power levels, and adjust their respective power levels as instructed by the TPC algorithm. Power control is therefore implemented on both ends of the link, where multiple sources and sinks may all operate at different power levels, and all individually adjust their respective power levels.

The invention relates to the field of wastewater treatment, and relates to a biological degradation method of nitrogen-containing heterocyclic compound wastewater. An oxidation state compound is added in the nitrogen containing heterocyclic compound wastewater, an anaerobic environment is formed by micro aeration, and mixed electron acceptors of dissolved oxygen and the oxidation state compound simultaneously exist in the system; an upflow biological aerated filter is used as a main reaction device, an optimal degradation effect of nitrogen-containing heterocyclic compounds is achieved according to different components and concentrations of the nitrogen-containing heterocyclic compounds, the pH is controlled to 7.0-7.5, the concentration of the dissolved oxygen is controlled to 0.05-0.3 mg / L (water discharged from the upper part of the filter), and the range of the oxidation-reduction potential is controlled to 150-50 mv; under an anaerobic aeration condition, with the nitrogen-containing heterocyclic compounds as electron donors and oxygen and oxygen-containing compounds as electron acceptors, under the combined effects of micro aerobic bacteria, facultative anaerobic bacteria, aerobic / anoxic denitrifying bacteria and the like, the nitrogen-containing heterocyclic compounds are completely degraded into carbon dioxide and water.