527 results about "Frequency allocation" patented technology

A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

A system and a method to automatically select a frequency set in a low-tier radio communication system, sharing frequencies with an overlapping high-tier cellular radio system, that minimally interferes with the high-tier system employing frequency hopping is described. The present invention makes use of the broadcast information that is transmitted by the high-tier radio base stations on their broadcast control channels (BCCH), which contains not only the BCCH carrier frequencies of surrounding cells, but also information regarding the frequencies applied in the considered cell for frequency hopping traffic channels. With this broadcast information, the low-tier system can derive the frequency planning of the high-tier system, and can then derive a frequency set for low-tier usage that minimally interferes with the overlapping high-tier system. The advantage with this technique is that only measurements on BCCH carriers have to be performed, which are non-hopping, have a constant transmit power, and have a continuous (non-bursty) signal.

A method and apparatus (system) for providing forward-link channel-frequency allocation for multiple-satellite cellular communications networks is disclosed. The system has a centralized ground-operations control center that provides bi-weekly minute-by-minute allocation plans for geographically-defined service areas. This enables each service area to set its diversity policy in accordance with the requirements of the government regulators and customer preferences within the service area. The system has a user model having a frequency re-use pattern, a channel allocation model for modelling the power allocated to each channel, and a gateway channel model for allocating channels in accordance with the user model and the channel allocation model. The allocation is made for each satellite of the plurality of satellites. The traffic allocation induces an operating frequency for each of the one or more links in each satellite of the plurality of satellites. The satellite communication system computed frequency allocation is optimized to minimize total radiation from all forward links for one or more of the plurality of satellites.

To alleviate the requirement to back-off all up-link performance, such as by limiting power spectral density, to overcome far-end cross-talk problems otherwise associated with relatively short loop-length wireline links, the present invention partitions the frequency spectrum based on an estimate of the loop length of a subscriber unit (CPE) modem from an exchange (LTE) modem. Up to a threshold frequency (fmax) at which received transmissions from a subscriber having a longest loop length (115) become indistinguishable by the LTE modem from a noise floor (102), up-link performance on all loop lengths is limited to correspond to that of the longest loop. At frequencies above the threshold frequency (fmax), subsets of subscribers (152-154) having relatively short loop lengths (116-119) use high frequency carriers that have signal to noise ratios sufficient to support information transmission in these elevated frequency bands.

A dynamic channel allocation method and system for use in a wireless network operates by monitoring at least the allocated channel allocated to a particular network node to generate one or more channel metrics relating to radio conditions on the channel. The metrics generated are Received signal power, signal to noise ratio of transmissions on the network and long-term mean square of the equaliser error used in each terminal. The generated metrics are communicated back to the cell access point or the network control server over a signalling channel, and a new frequency is allocated to the cell if it is determined from the metrics that the presently allocated channel is suffering interference. The signalling channel is preferably an ATM VPI/VCI pair, such that signalling messages are transmitted as ATM cells which can be communicated across the wireless channel using the sane signalling frame as is used for payload cells.

A frequency agile cable modem termination system which is configured to receive cable TV or other broadband signals on a frequency allocated basis. Cable TV headend may receive cable TV modem or other signals via optical/electrical converters and other links, and route those signals through a frequency multiplexer to divide individual feeds into separated frequency slots. The cable modem termination system may then have receivers tuned to individual slots allocated to data feeds, such as Internet, video, telephony or other sources, and route those sources over the Internet. Upon a failure condition within any given receiver or other component, a backup cable modem termination system, connected to the same common bus as the main or active system, may be rapidly activated by having backup receivers contained in that unit tuned to appropriate frequencies to pick up the signals within the corresponding band. Reliability and robustness is increased, and cabling requirements are decreased.

A base station for use in a mobile telephony network includes an antenna arrangement coupled to a transceiver arrangement for producing a plurality of beams. A method of testing the base station comprises detecting at the transceiver arrangement the signal strengths of a test signal received via the beams; comparing and/or correlating the said signal strengths detected at the transceiver arrangement; and using the results of the comparisons and/or correlations to determine the configuration of the antenna arrangement and transceiver arrangement and/or to detect faults. The comparison of average signal strengths can be used to detect cabling faults, and beam errors. The correlation of un-averaged signal strengths can be used to determine which beams have the same polarisation. Beam pointing directions and the allocation of antennas to sectors can be determined by monitoring handovers of mobiles moving between cells. Frequencies may be allocated to sectors according to a frequency re-use scheme.

The present invention provides a method of allocating a frequency parameter for random access preamble transmission. The method includes determining a fixed location, in an operating bandwidth, of a frequency region for random access transmission wherein a relative location parameter defines the fixed location of the frequency region according to a bandwidth parameter, the relative location parameter being common to a plurality of cells. The present invention further provides a method of allocating a frequency parameter for random access transmission. The method comprises allocating a fixed location, in an operating bandwidth, of a frequency region for random access transmission, wherein the fixed location is configurable per cell.

A method for transmitting and receiving signals using multi-band Radio Frequencies (RFs) is provided. The method transmits an information unit of a specific layer above a physical layer through a plurality of frequency allocation bands managed by the specific layer and transmits control information identifying each of the plurality of frequency allocation bands. The control information identifying each of the plurality of frequency allocation bands includes a second ID into which a first ID has been converted, the first ID identifying each of the plurality of frequency allocation bands in the physical layer, the second ID identifying each of the plurality of frequency allocation bands managed by the specific layer in the specific layer. To accomplish this, a timing offset is applied to the entirety of a frame or to a preamble (synchronous channel) so that the timing offset is used as the ID. Applying a timing offset to the entirety of a frame or to a preamble (synchronous channel) can achieve an advantage of PAPR reduction.

A system for and method of transmitting and storing data using multidecimal encoding. A binary data stream is encoded into a multidecimal data stream. Distinct frequencies are then assigned to characters in the multidecimal data stream for transmitting the multidecimal character information. Individual frequencies, or combinations of frequencies, may be assigned to each multidecimal character to be transmitted, through various methods. The various multidecimal transmission schemes described herein may be employed in any of several transmission systems, such as fiber optics networks, analog transmission systems, DSL systems, cable modem systems, wireless communication systems, or any other suitable data transmission systems. Multidecimal data may also be stored in various storage media, such as CD-ROMs, DVDs, or RAM.

A method for selecting a cell by a user equipment (UE) to receive an MBMS service in a mobile communication system supporting multimedia broadcast/multicast service (MBMS) having different frequency allocations (FA) in the same area. In this method, a Radio Network Controller (RNC) sends information about MBMS cells to the UE, the MBMS cell information including MBMS offsets for ensuring the priority of cell reselection to the MBMS cells. The UE performs cell reselection using the MBMS cell information, and receives the MBMS service from the reselected cell.

The invention relates to the mobile communication technology field, in particular to a network frequency optimization method based on measurement reports. The method includes the following steps: firstly extracting a measurement report and establishing an interference matrix; calculating the adaptability of each frequency distribution proposal in a frequency distribution proposal group according to the interference matrix; establishing the proportional distribution according to the size of the adaptability and implementing random search selection; generating a new group of frequency distribution proposals through random frequency point modification or frequency point interconversion; recalculating the adaptability of each frequency distribution proposal in the new frequency distribution proposal group; continuously repeating the above steps until the adaptability of a new frequency distribution proposal meets the requirement; finally the frequency distribution proposal with largest adaptability in the frequency distribution proposal group becoming the network frequency distribution proposal after the optimization of the present network. The method provided by the invention takes the measurement report of the present network as the basis of frequency optimization and fully considers the real district interference condition of the present network, thus achieving the minimum interference of the network after frequency optimization.

The foregoing objects are achieved as is now described. A method for evaluating frequency plans for a CDMA based communication system having fixed base radio telephones is provided. The method begins by determining locations of a plurality of antennas. The plurality of antennas provide a coverage area for radio telephones. Then the method generates locations of radio telephones within the coverage area. Next, a distance from each radio telephone to the antennas is calculated. Then frequencies are allocated to the antennas. The resulting communication parameters between the radio telephones and the antennas are evaluated. Next, the coverage area which provides optimum power control to each radio telephone is determined. A frequency reuse factor is calculated to determine the efficiency of the allocated frequencies such that frequency allocation plans can be analyzed to determine efficient frequency planning.

In an audio speaker network, setup of speaker location, sound track or channel assignation, and speaker parameters is facilitated by an application detecting speaker locations and prompting a user to input rough room boundaries and a desired listener location in the room. Based on this, optimum speaker locations/frequency assignations/speaker parameters may be determined and output.

The embodiment of the invention discloses a TD (time division) frequency planning and scrambling code planning method based on an adjacent zone priority level, comprising: an adjacent cell priority level is generated through a zone adjacent factor, a zone factor and a zone direction factor based on the base station zone attribute according to the system technical scheme; and a TD main carrier frequency is distributed according to the generated adjacent zone priority level to ensure the minimality of the frequency interferences among zones; and then, a system assigns base scrambling code blocks and scrambling codes according to the adjacent zone priority level and the frequency so as to ensure the average minimization of the mutual interference of the frequency scrambling code among zones. According to the embodiment of the invention, the calculation method of the adjacent zone priority level is more reasonable, and the setting and switching process of the adjacent zone relationship is more reasonable. Furthermore, co-frequency encounter phenomena among the adjacent zones are avoided by adopting the scheme, so that the mutual correlation of the scrambling codes among the adjacent zones is minimal, and the maximal frequency resource and scrambling code resource utilization and the minimum frequency and scrambling code interferences among zones are ensured. And the network performance indexes such as call completing rate are improved, and the client perception quality is greatly improved.

A method for transmitting and receiving signals using multi-band Radio Frequencies (RFs) is provided. The method performs channel coding on an information unit of a specific layer above a physical layer to produce a specific number of codewords and maps the generated specific number of codewords to a plurality of frequency allocation bands managed by one specific layer, and then transmits the mapped signal through each of the plurality of frequency allocation bands. Each of the plurality of frequency allocation bands managed by the one specific layer has a band size for allocation for a specific service according to a predetermined frequency policy. When the generated specific number of codewords is mapped to the plurality of frequency allocation bands, each of the specific number of codewords is mapped to at least one of the plurality of frequency allocation bands. A frequency allocation band used for transmission of each codeword when the codeword is retransmitted may be set to be different from that when it is initially transmitted.

An apparatus and method for performing initial network entry in a broadband wireless communication system are provided. A communication method includes broadcasting, by a Base Station (BS), a Downlink Channel Descriptor (DCD) message including information on a different Frequency Allocation (FA) of the BS using all FAs; connecting, by one of a plurality of Media Access Control (MAC) processors of a Mobile Station (MS), using an arbitrary FA of the BS; obtaining, by the MS, information on the different FA of the BS by analyzing the DCD message received using the arbitrary FA; and performing, by one or more of the remaining MAC processors of the MS, a network entry process using the different FA of the BS according to the different FA information. Accordingly, when an MS having a plurality of MAC addresses connects to a system that performs communication through multiple FAs, different MAC processors of the MS can perform initial network entry using different FAs in the same cell (or sector or BS) without collisions.

In an OFDM-TDMA power line communication system, time slot and carrier frequencies are assigned in a manner that reallocates time slots and carrier frequencies to enhance the efficiency of utilization of bandwidth. The reassignments are communicated between transmitting and receiving stations by transmitting tone maps that designate the reassignment of the time slots and carriers. Several variations are presented depending upon the circumstances of channel use and prior assignment of time slots and channels.

The invention provides a multi-user large-scale MIMO pilot frequency multiplexing transmission method based on multi-cell coordination. According to the transmission method, all base stations provided with a large-scale antenna array wirelessly communicate with several users on the same time-frequency resource, it is not required that the users in the same cell use complete orthogonal pilot frequency, it is not required either that different cells completely multiplex the same pilot frequency, and the users in the same cell or the different cells can multiplex the same pilot frequency. Multi-cell coordination communication is adopted, and a cell cluster is formed by the multiple cells. The transmission method includes the steps that all the cell base stations obtain statistics channel information of all the users in the cell cluster and send the information to a central control unit which takes charge of coordinating all the cells in the cell cluster; according to the statistics channel information, the central control unit allocates pilot frequency to all the users in the cell cluster and feeds back a result to all the base stations; all the base stations obtain all user channel estimations and statistical characteristics of errors of the user channel estimations by using pilot frequency signals sent by all the users, and the base stations perform uplink robust receiving and downlink robust pre-coding according to all the user channel estimations and the statistical characteristics of the errors of the user channel estimations. The transmission method can reduce the pilot frequency overhead substantially and improve net spectrum efficiency of a system and is high in adaptability to pilot frequency allocation algorithms, and uplink receiving and downlink pre-coding transmission has robustness.

Method and corresponding system for spectrum management featuring advanced frequency-allocation planning and advanced interference avoidance. The invention discloses access points that transmit directionally and assigning a predefined channel in a predefined direction, in order to reduce interference between closely located access-points