48 results about "Cdma channels" patented technology

In a code division multiple access (CDMA) communications system including one or more terminals (such as customer premise equipments, CPEs) that communicate with a node (such as an Internet gateway) via at least a random access channel and a reservation-oriented channel, various schemes of managing communications traffic among the channels are provided. Decisions as to the channel on which a given terminal may transmit may be based on: traffic statistics (such as packet size or average data rate over a time period), traffic content (such as packet type), the terminal's output buffer loading (queue state, or “Q-state”), a history of the terminal's output buffer loading (one or more Q-states), and so forth. In one application, decisions in managing traffic in a live user's web browsing sessions may involve intelligent ascertainment of whether a given terminal is busy based on traffic analysis or output buffer loading.

A method and system for providing acknowledgment and/or data rate control (DRC) information with respect to data packets conveyed on a plurality of active forward link (FL) carriers. The number of reverse link (RL) carriers employed for the acknowledgment and/or DRC information may be less than the number of active FL carriers, and may be a single carrier, even when the signaling protocol is, in the limit, consistent with presently-supported standardized CDMA protocols. Code multiplexing techniques are employed inventively to convey information for up to fifteen FL carriers on a single, standard CDMA channel designed to provide such signaling for only a single FL carrier at a time.

In one embodiment, a multi-carrier CDMA network grants radio link resources to a mobile station by maximizing soft handoff conditions, by preserving frequency continuity with the mobile station, or by load balancing across carrier frequencies in two or more cells, or by some combination thereof. The network identifies carrier frequencies having two or more CDMA channels for assignment to the mobile station. If one of those frequencies was used by the mobile station to request resources, it may be advantageous to select that frequency; otherwise or instead, the choice is narrowed to the carrier frequency or frequencies having the greatest number of available radio links. From that point, the choice may be further narrowed, for example, by selecting the carrier frequency having the most favorable CDMA channel loading across two or more cells. In another embodiment, such multi-carrier load balancing is the basis of carrier frequency selection.

Provided is a method and apparatus for acquiring time information from a CDMA system in a mobile communication terminal. The method includes: searching for a CDMA channel in a predetermined manner when a CDMA modem or module is activated; receiving a sync channel signal via the searched CDMA channel and extracting time information from the sync channel signal; and setting a time of the mobile communication terminal using the extracted time information. Therefore, even when the mobile communication terminal communicates with a system that does not provide time information, the mobile communication terminal can precisely maintain its time by acquiring time information from a CDMA system.

A CDMA network dynamically generates hard handoff (HHO) target sets to support mobile station HHO. Dynamically identifying CDMA channels or cells as targets for HHO eliminates the need for statically configured HHO target sets. In an exemplary embodiment, a source BSS identifies a first set of channels corresponding to common neighbor cells of the cells associated with the active set pilots and/or reported PBU pilots. This first set may be adjusted by removing any common neighbor cells that include soft handoff target channels, and by adding selected vertical neighbor channels of the active set pilots and/or reported PBU pilots. Channels in the first set may be grouped by carrier frequency and evaluated based on CDMA channel type, BSS affiliation and characteristics, and the target's relationship to the active set to identify a preferred HHO target set. Such operations permit dynamic determination of whether to perform inter- or intra-BSS HHO.

Aspects of a method and system for servicing a plurality of users via a plurality of femtocells are provided. In this regard, a cellular enabled communication device may receive portions of a datastream from a plurality of femtocells, reconstruct the datastream from the received portions of the datastream, and process the reconstructed datastream for presentation to a user of the cellular enabled communication device. The received portions may be buffered in the cellular enabled communication device. The portions of the datastream may be associated with a plurality of CDMA channel access codes. The portions of the datastream may be received via a plurality of cellular frequencies. The portions of the datastream may be received during a plurality of TDMA timeslots. Portions of the datastream may be received from a cellular base station. Portions of the datastream may be received from a WiMAX base station.

This invention is about a method to reduce the near-far effect in the physical and media access control (MAC) layer for focusing on CDMA radio technologies in ad-hoc network systems. The radio resource is first organized and separated into small pieces, divided in both frequency domain (FDMA) and in time domain (TDMA). Each radio resource is considered as a physical radio channel (PRC). Any node in the network can dynamically allocate it. The near-far effect will be mitigated in each PRC, which is used for supporting a set of CDMA based sub-channels. The selection of the TX and RX PRC depends on which small geographical area (SGA) the node is located. As the nodes in the same SGA share the same PRC as the preferred and designated receiving PRC, power control is possible in a neighborhood of multiple SGA. Each SGA is viewed as a virtual base station regarding a designated PRC as the uplink channel. And each PRC provides a multiple sub-channels via the CDMA method. Adopting this Listening Frequency and Resource Planning (LFRP) can substantially increase the ad-hoc network capacity, by limiting the near-far effect in CDMA channels.

A mobile station for use in an IS-2000-compatible wireless network. The mobile station is capable of receiving data from a first base station of the wireless network simultaneously in a first code division multiple access (CDMA) channel and a second CDMA channel. The mobile station transmits a capability message to the first base station, the capability message comprising a field indicating that the mobile station is capable of simultaneously operating in a Forward Packet Data channel (F-PDCH) and a Forward Supplemental channel (F-SCH).

The invention provides a method and a device for terminals to select resident CDMA channels. CDMA channels configured on a base station is divided into at least two CDMA channel groups, wherein each CDMA channel group is used for supplying service for terminals with different priority levels, and the base station is used for determining that all the CDMA channels of a paging channel or a broadcast control channel are configured in each CDMA channel group. The method for terminals to select resident CDMA channels comprises the following step of: broadcasting a channel list message in the coverage area of the base station by the base station through all the CDMA channels of the paging channel or the broadcast control channel configured in each CDMA channel group, wherein the channel list message comprises channel marks of all the CDMA channels in each CDMA channel group, which are configured with the paging channel or the broadcast control channel, so that the terminals with different priority levels can select the resident CDMA channels in the CDMA channel groups.

A multi-carrier transmitter capable of transmitting on one or multiple frequency channels simultaneously is described. In one design, the multi-carrier transmitter includes at least one processor and a single radio frequency (RF) transmission chain. The processor(s) may generate output chips for each of multiple frequency channels, digitally filter and upsample the output chips for each frequency channel to obtain filtered samples, and digitally upconvert the filtered samples for each frequency channel to a different frequency to obtain upconverted samples. The processor(s) may then combine the upconverted samples for the multiple frequency channels to obtain composite samples, perform pre-distortion on the composite samples for I/Q mismatch compensation, and upsample the pre-distorted samples to obtain output samples. The output samples may be converted to an analog signal with a wideband DAC. The RF transmit chain may process the analog signal to generate an RF output signal.

Parallel interference cancellers are connected in successive stages. In each canceller, multiple signal paths are provided for interference replica estimators to receive multiple CDMA channels. A spread code is generated for each signal path for dispreading the path components of the channel. In each signal path, the despread components are RAKE combined and a symbol replica is detected therefrom either by detecting or estimating the type of modulation. The detected symbol replicas are re-modulated and then re-spread to produce interference replicas. In each stage, the interference replicas are summed and subtracted from a delayed CDMA signal and then summed with the interference replicas of the same stage. Output signals from the final stage are despread and symbol replicas are recovered therefrom. For each signal path, a spread code is detected from a control channel and compared to the generated spread code. Those symbol replicas where a coincidence is detected are supplied to respective decoders and diversity combined.

The present invention is a novel and improved method for monitoring the real time loading condition in a CDMA wireless communication system. The level of the power control signal is obtained by monitoring, in real time, at the base station the forward link CDMA channel, comparing this measurement to the previously obtained level, and displaying the level of the power control signal as a line which can consist of two parts. The first part can be a solid line the length of which represents the level of the power control signal in real time and the second part can be a dotted line whose length increases slowly and decreases rapidly to indicate that the level of the power control signal is rising. Conversely, a rapid increase and a slow decrease of the length of the dotted line indicates that the level of the power control signal is falling. Color coding can be used to indicate that the level of the power control signal is at or outside an optimum operating range.

Disclosed is a method for operating a CDMA channel in a base transceiver station (BTS). The method for operating the CDMA channel in the BTS includes variably generating a CDMA channel list message transmitted from the BTS to a mobile station (MS) in a CDMA mobile communication system according to the BTS and a frequency allocation (FA) within the BTS, so as to variably operate the CDMA channel by the BTS and the FA. The method according to an embodiment of the present invention also includes variably allocating a CDMA frequency number group by the BTS and the FA in accordance with a CDMA channel index, a CDMA channel ID, and a CDMA channel kind, so that the CDMA channel is operated between BTSs and further by the FA, independently, thereby optimizing the CDMA frequency operation between the BTS and the MS.

The invention relates to an on-line monitoring system for a transformer substation. The on-line monitoring system comprises a distribution monitoring terminal, a GSM/CDMA channel and a background server, wherein the distribution monitoring terminal is used for acquiring and recording data; the GSM/CDMA channel is used for performing remote data transmission; and the background server is used for performing trend analysis on the acquired and recorded data and maintaining the distribution operation according to the trend analysis result. The acquired data comprises three-phase current, three-phase voltage, active power, passive power, active electric quantity, passive electric quantity, three-phase total active electric quantity, total passive electric quantity, maximum value and minimum value of current and occurrence time of each data. The recorded data comprises historical record of voltage exceeding upper limit and lower limit, historical record of overload current and historical record of open phase and current loss. Through the system, the trend analysis is performed on the acquired and recorded data and the distribution operation is maintained according to the trend analysis result, so that the efficiency of monitoring the distribution operation is increased, the distribution operation is maintained in time, the maintenance timeliness is improved, and the like.