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350 results about "Dynamic channel" patented technology

Wireless communication system with dynamic channel allocation

A plurality of base stations communicate with a plurality of mobile units. Each base station includes a base station transceiver that receives inbound information from the mobile units and transmits outbound information to the mobile units. A mobile switching center (MSC) is coupled to the base stations and communicates the inbound information and outbound information with the base stations. The base stations each include signal detectors that detect signal strength of the inbound information, co-channel information and adjacent channel information. The MSC maintains a table of signal strength per communication channel and allocates communication channels to the base stations based on the signal strength information. The inventive dynamic channel allocation includes several channel allocation algorithms that can be active at the same time. Only one of the algorithms is active at a time. The choice of the algorithm is based on current interference conditions and traffic load. The invention is implemented in the MSC and base stations of a digital cellular network using wideband technology for its air interface. While the decision-making mechanism and the channel allocation algorithms are implemented in the MSC, the protocol between the MSC and base stations is extended to support the proposed concept for dynamic channel allocation. Advantages of the invention includes improved communication and reduced interference.
Owner:WJ COMM

Adaptive channel estimation thresholds in a layered modulation system

Dynamic channel estimation thresholds allow for determining optimal threshold values for channel estimation in a layered-modulation wireless communication system. A channel estimation threshold can be used to remove or otherwise filter out channel estimate components that may be significantly influenced by noise. The channel estimation threshold value can be used to generate a refined channel estimate that is used in decoding multiple layers of a layered modulation signal. The channel estimation threshold value can be varied based on the performance of the various signal layer decoders. The adaptive channel estimation threshold provides for decoding a base layer based on an optimal threshold value for the base layer; determining an error rate associated with decoding the base layer; and using an optimal threshold value for an enhancement layer in a channel estimation algorithm if the error rate is lower than a predetermined level.
Owner:QUALCOMM INC

Distributed dynamic channel allocation technique for multi-carrier CDMA cellular systems with mobile base stations

A distributed dynamic channel allocation algorithm for a multi-carrier CDMA cellular system having at least one mobile base station. The distributed dynamic channel allocation algorithm uses channel power measurements from both the requesting mobile station and the mobile base station attempting to allocate an available resource to the mobile station. The distributed dynamic channel allocation algorithm attempts to allocate the best available resource for the requesting mobile station, in terms of interference, while minimizing the amount of interruption that the allocated resource may cause to existing connections in neighboring cells. Thus, the distributed dynamic channel allocation algorithm follows a “least-interference, least-interruption” strategy. The distributed dynamic channel allocation algorithm is load balancing, since it tends to assign new resources to mobile base station with lighter loads.
Owner:WSOU INVESTMENTS LLC +1

System and method for dynamic channel allocation in a communication system using an orthogonal frequency division multiple access network

A system and method for dynamically allocating channels in a wireless communication system including multiple sub-channels and multiple frame cells, each of the sub-channels being an assembly including a preset number of sub-frequency bands divided from an overall frequency band, the frame cells using each of the sub-channels as a basic transmission unit and having a frequency domain and a time domain occupied by the sub-channels. A mobile station transmits channel quality information of frame cells to an access point. An access router transmits channel allocation information about the multiple frame cells and sub-channels determined according to the received channel quality information to the access point, and the access point receives the channel allocation information about the multiple frame cells and sub-channels, compares the channel allocation information with newest channel quality information, and allocates a sub-channel of a frame cell selected according to the comparison to the mobile station.
Owner:SAMSUNG ELECTRONICS CO LTD

Method for implementing fast-dynamic channel allocation call admission control for radio link reconfiguration in radio resource management

A method of implementing fast dynamic channel allocation call admission control for radio link reconfiguration in a wireless communication system includes a precode allocation procedure, a signal-independent code allocation procedure, and a post-code allocation procedure. The pre-code allocation procedure receives and processes a request message and retrieves system measurements and wireless transmit / receive unit (WTRU) capability information from a centralized database. A list of available timeslots and a list of code sets is retrieved from the centralized database. The code sets are allocated to the available timeslots, wherein a successful assignment is a solution. The solution having the lowest weighted interference signal code power is an optimal solution. The WTRU information with new allocation information is updated in the centralized database. A radio link reconfiguration ready message with the results of the code allocation process is then sent.
Owner:INTERDIGITAL TECH CORP

Adaptive channel coding using polarization

Methods, systems, and devices are described for wireless communications at a wireless device. A wireless device may adaptively select a parity check matrix to increase the reliability of signal transmission by adapting to different channel statistics and channel types (e.g., erasure channels, channels with additive white Gaussian noise, and channels with discrete or continuous alphabets). For example, polarization codes (i.e., codes based on rows of a polarization matrix) may be used to construct parity check matrices “on-the-fly” given an estimation of dynamic channel conditions or diverse channel structures. The channel may be decomposed into polarized sub-channels corresponding to the polarization codes, and mutual information profiles may be determined for each of the polarized sub-channels. The parity check matrix corresponding to the polarization codes may be constructed based on the mutual information profile of all polarized sub-channels. The wireless device may encode or decode data based on the constructed parity check matrix.
Owner:QUALCOMM INC

Method and apparatus for adapting to dynamic channel conditions in a multi-channel communication system

A disturbance detection and fast re-train method and apparatus configured for use in a multi-channel communication is disclosed. During data communication disturbance detection occurs by monitoring error rates or other factors, such as crosstalk profiles. Upon detection of a disturbance, the system generates and transmits a line upset condition signal to an opposing terminal and monitors for a similar response from the opposing terminal. Channels which fail to convey such signals may be switch out of service. The signals received via the channels may be utilized as training signals to thereby yield a new crosstalk profile. The new crosstalk profile is processed to establish one or more new multiple input, multiple output filter coefficients, bit loading settings, and gain level settings. These new settings may exchanged with the opposing terminal. In addition, channels which, although transporting signals, yield CRC error rates over a pre-determined threshold, are removed from service.
Owner:POSITRON ACCESS SOLUTIONS

Method and apparatus for dynamic channel sensing for direct link in a high efficiency wireless LAN

Methods and apparatus for dynamic channel sensing for direct link in a High Efficiency WLAN (HEW) are provided. The methods include a method for dynamic channel sensing for a direct link by a first station (STA) in a wireless local area network. The method may include determining a first COLOR parameter of an access point to which the first STA is associated, exchanging with a second STA a COLOR parameter related to the direct link, the second STA being a peer STA of the first STA in the direct link, and determining a channel state based on a value of a COLOR field included in a received physical layer protocol data unit (PPDU) having a valid SIGNAL (SIG) field, the first COLOR parameter, and the COLOR parameter related to the direct link.
Owner:ATLAS GLOBAL TECH LLC
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