Abstract: A spreading code notification section 201 notifies each mobile station apparatus of a spreading code corresponding to a mobile station apparatus currently communicating, a separation section 212 separates information indicating an interference station detected from the results of spreading in each mobile station apparatus from a received signal, and a control section 213 decreases the transmission power of a signal to the interference station.

Abstract: In a system in which multiple remote units compete for limited communication resources, a remote unit accesses the system by randomly selecting a first sequence from a set of predetermined sequences. The remote unit transmits a data bit stream modulated with the first sequence beginning at one of a set of recurring admission boundaries. If the remote unit determines that the data bit stream has not been successfully received at a hub station, it randomly selects a second sequence from the set of predetermined sequences. The remote unit transmits the data bit stream modulated with the second sequence beginning at one of the set of recurring admission boundaries.

Abstract: A method and apparatus for identifying which one of a plurality of mobile terminals in communication with a ground-based base station, via a transponded satellite, is causing interference with a non-target satellite orbiting in a vicinity of the transponded satellite. The method involves using the base station to sequentially check each of the mobile terminals to identify which one is causing the interference. The check is made by the base station commanding each mobile terminal to modulate the power level of its transmitted signals and then checking with an operator of the interfered with non-target satellite to see if the interference condition has changed. Once the mobile terminal causing the interference condition is identified, the base station can command the mobile terminal to reduce its transmit power accordingly.

Abstract: An antenna 20 receives signals orthogonal to each other transmitted from different antennas of a base station, and a despreader 202 and a spreader 203 despread the respective received signals using the same spreading code used in the base station, a demodulator 204 and a demodulator 205 demodulate the despread signals, a reception power measuring section 207 and a reception power measuring section 208 measure reception power from the demodulation results, a reception power combiner 209 combines measured reception power, and a transmission power controller 212 controls transmission power based on combined reception power. This makes it possible to perform open loop transmission power control at high speed and with high accuracy even when a fading variation is small.

Abstract: In a radio system, the transmission power is controlled by a receiver (1; 2) evaluating the signal from a transmitter (2; 1) and a determining power adjustment information (TPC) as a function of this, and sending this information to the transmitter (2; 1) during successive timeslots (4), in order to control the transmission power. In what is referred to as the slotted mode, the same power adjustment information (TPC) is transmitted to the transmitter (2; 1) in a number of successive timeslots (4) following a section (9) which is not filled with information.

Abstract: A two-way satellite communications system includes an Earth station communicating with a plurality of remote terminals using a network access protocol that facilitates low power consumption by the terminals. The earth station generates forward link TDM packet data transmissions on one or-more satellite channels, and detects, despreads and decodes multiple concurrent return link slotted CDMA packet transmissions on one or more satellite channels. It communicates through a wired connection with a packet processing center which ultimately both delivers return link packet data to end-customers and receives forward link packet data from end-customers. The remote terminals receive, process and act upon forward link TDM transmissions on one or more satellite channels, and generate slotted spread spectrum CDMA transmissions on the return link on one or more satellite channels.

Abstract: A wireless communications network includes a mobile station and base station that are capable of communicating over a wireless link. Information relating to a status of a buffer in the mobile station and information relating to a data rate over a reverse wireless links is communicated over the reverse wireless link.

Abstract: A power control system (12) for a satellite (10 includes a high power amplifier circuit (28) that receives a saturated power output adjustment signal. The amplifier circuit (28) includes a programmable circuit (70). An electronic power conditioner (56) is coupled to the programmable circuit (70) and is configured to reset an operating set-point of said high power amplifier circuit (28) in response to the saturated power output adjustment signal. A high power amplifier (46) has a variable output power range and amplifies a received signal in response to change in the operating set-point. A channel amplifier (44) is coupled to the programmable circuit (70) and is configured to gain offset the received signal in response to change in the operating set-point.

Abstract: A system and method for managing access to a satellite-based transponder by a plurality of aircraft each having a mobile radio frequency (RF) system. The system employs a ground-based, central control system for managing access to the satellite-based transponder so that the aggregate power spectral density (PSD) of the RF signals of all the mobile systems does not exceed, at any time, limits established by regulatory agencies to prevent interference between satellite systems. This is accomplished by a dual control loop arrangement for monitoring the signal-to-noise ratio (Eb/No) of the RF signal transmitted by the satellite-based transponder. A ground-based control loop is used whereby a ground-based central controller monitors the Eb/No and transmits commands to the aircraft (via the satellite transponder) to maintain the Eb/No of the transmitted signal within a predetermined range.

Abstract: A new and significantly improved approach for controlling the transmission power in the uplink direction of a CDMA-based radio system is disclosed, which provides a transmission power control even with regard to an overall link quality substantially involving a real time reaction on changes in the environment. A CDMA-based radio system is described which comprises an inner power control loop for adjusting the transmission power between a user equipment and at least one base station based on the signal to interference ratio to ensure that the signal to interference ratio is similar to a target signal to interference ratio at least within a predefined range and an outer power control loop for adjusting the target signal to interference ratio based on the link quality to ensure a target link quality necessary for fulfilling a predetermined quality of service in view of link quality at least within a predefined range.

Abstract: An access point in a wireless network may receive packets over a wired network. The access point may be provided with instructions from the host to determine when to awaken the host from a reduced power consumption state in response to the receipt of a packet. Thus, the access point can enforce wake packet filtering rules while the host is maintained in a reduced power consumption state. This may reduce the power consumption of the host by avoiding the unnecessary awakening of the host every time a packet of little importance arrives over the network.

Abstract: A method for compensating for power variations in satellite communications includes measuring or estimating power variations for signals received at an earth-based terminal. The method also includes measuring or estimating changes in carrier-to-noise levels by a number of satellite terminals. The power variations may then be used to adjust the measured/estimated changes in carrier-to-noise (C/N) levels. The adjusted C/N levels may then be used to more accurately reflect actual network conditions and may be used in downlink power control related processing.

Abstract: In a mobile communication receiving apparatus in which signals received on a plurality of receiving paths (branches) are combined by a combiner, correlation between noise signals contained in the signals received on respective ones of the branches is detected by a noise correlation calculating unit, and control is exercised so as to maximize signal-to-noise power ratio of the combined signal based upon the correlation calculated in the noise correlation calculating unit. Signal-to-noise power ratio can be maximized even if noise components contained in respective ones of the branch signals are mutually correlated.

Abstract: A method and apparatus for transferring information over a communications link includes transmitting information at a first power level, monitoring for correct reception of the transmitted information and transmitting further information at a second, power level other than that used for the original transmission if correct reception did not occur. The further information allows the content of the originally transmitted information to be established and in one embodiment constitutes a retransmission of the originally transmitted information. By retransmitting at a different power level the probability of correct reception may be enhanced, especially when the communications link is wireless. The first and second transmission power levels are governed using closed loop power control such that transmission power level is controlled to achieve a required quality of reception parameter at the receiving end of the link. In one arrangement the quality or reception parameter is the signal-to-interference ratio.

Abstract: In a satellite or other relayed communication system having a plurality of subscriber terminals that communicate through an elevated wireless relay (typically a satellite operating in bent pipe mode), a technique for subscriber terminal power control is provided whereby the power level is controlled via leader-follower operation relying on sharing control factors determined at a single calibrated subscriber terminal transmitter (the leader terminal) to create traffic to be compared to the received traffic of the other subscriber terminals. The power level of the subscriber terminals is then adjusted based on the relationship of their received energy to the received energy of the leader terminal.

Abstract: A device for placing power control data in a transmission signal has: a generating device for generating power control data as a function of a received signal, a buffer for buffering a formatted transmission data word that contains a power control data field for recording power control data, an inserting device for inserting the generated power control data into the power control data field of the buffered transmission data word, and a modulation device for modulating the transmission data word to form a transmission signal with a transmission power corresponding to the power control data.

Abstract: A system and method for calculating an optimum transmission power level in an ad-hoc network communication path having a maximum number of transmission hops. The system and method calculates an optimum transmission power level for transmission routes having a maximum number of hops between nodes and transmits the communication using the calculated power level such that a transmission path is achieved that results in a maximum pipeline delay during transmission that does not exceed allowable levels for the service class provided.

Abstract: Disclosed is a transmitter gain stabilization apparatus which uses feedback control to stably control the gain of a radio base-station transmitter in a CDMA mobile communication system. The apparatus includes a reference-power generating unit for generating average power of a baseband signal as reference power, a detector for detecting transmission power, and a gain adjustment unit for adjusting the gain of a radio unit in the base station in such a manner that the detected power will coincide with the reference power.

Abstract: A power control scheme for a wireless network communication system that includes a base station and multiple wireless mobile device dynamically adjusts transmission power of a mobile device in conjunction with adjusting its bit allocation in source coding and channel coding to minimize its total power consumption while maximizing the system capacity in terms of the total effective transmission rates received by the base station. The base station sets a target signal quality value for each mobile station, and the target values are determined by the base station such that the total effective data rate from all the mobile devices is maximized under constraints of the total received power and the error protection level requirements for the mobile devices.

Abstract: An apparatus for measuring data transmission performance through a packet switched network, the apparatus having a time of day (TOD) clock for determining a send TOD timestamp, and for determining a present TOD when a data packet returns to the sending apparatus. The apparatus further comprising a counter that is incremented by a send sequence number each time data is sent, and one or more subtractors for calculating a first time difference between the send TOD timestamp and a receive TOD timestamp, and for calculating a second time difference between the receive TOD and the present TOD. Additionally, one or more comparators of the apparatus compare a sequence difference between the send sequence number and a receive sequence number in order to measure data transmission performance.

Abstract: The power level of at least one forward-link signal is determined for a measurement interval, where the measurement interval has a duration smaller than or equal to the time period in which at least one power-indicative signal characteristic can change. For example, a power-indicative signal characteristic used can be the information rate of the signal, which can change once per frame. In this case the measurement interval would be smaller than or equal to a frame. Preferably, the measurement interval is smaller than the time period in which any of the power-indicative signal characteristics can change. The power level of the signal is based on the signal's power-indicative signal characteristics during the measurement interval. In one embodiment of the invention, the signal's power-indicative signal characteristics include the information rate, and the gain of the signal.

Abstract: A node (105-1) determines a power level for transmitting to a neighboring node (105-2) in a wireless network (100). The node (105-1) receives one or more messages indicating a location of the neighboring node and a type of directional antenna of the neighboring node (105-2) that transmitted the one or more messages. The node (105-1) determines the power level for transmitting to the neighboring node (105-2) based on the location of the neighboring node (105-2) and the type of the directional antenna.

Abstract: A best-cell amendment method is disclosed for amending hysteresis margins according to the degree of congestion. A radio network controller (RNC) compares the average value P(k) of transmission power of a downlink shared channel PDSCH of cell k and a first threshold value P_threshold1 to measure the degree of congestion. If the RNC determines that the degree of congestion in cell k is high, it sets a small hysteresis margin hm_a, and if RNC determines that the degree of congestion in cell k is low, it sets a large hysteresis margin hm_b.

Abstract: A method for controlling power consumption in a communication device is provided. The method includes powering down a receiver of the communication device for a selected period of time and, when the selected period of time expires, powering up the receiver to check for incoming data.

Abstract: A mobile unit 40 which is in a soft handoff condition 50 with a base station (32) has the power transmitted by the base station (32) on the mobile link (52) controlled. The base station (32) determines (70) when a frame erasure count reaches a particular level N. The base station then places this link in a clamped state (72) at minimum power. When the base station determines that M consecutive good frames have been received (92), the base station restores the link (52) to a normal state (94). A recovery arrangement (100, 110 and 120) prevents clamping by all base stations (32–34) and loss of the link.

Abstract: Techniques for controlling the transmit power for a number of data streams in a wireless multi-channel (e.g., MIMO) communication system. In one method, a number of received symbol streams are initially processed in accordance with a particular (e.g., CCMI, CCMI-SC, MMSE, or MMSE-SC) receiver processing technique to provide a number of detected data streams. The post-detection SNRs of the detected data streams are estimated, and each SNR that exceeds a setpoint is identified. This setpoint may correspond to (1) the SNR needed to achieve the maximum allowed spectral efficiency or (2) the target SNR needed to achieve a specified spectral efficiency. A new (or adjusted) transmit power for each detected data stream associated with a post-detection SNR that exceeds the setpoint is determined and used for the data stream. Different power control schemes are provided for different classes of receiver processing techniques with different characteristics.

Abstract: In a communication system (100), a method and apparatus provide for efficient power control between base station (101) and mobile stations (102-104). A controller is configured for determining duty cycle of a communication channel, and for controlling power level of the communication channel based on the determined duty cycle. The controller may compare the determined duty cycle against a duty cycle threshold. An adjustment for controlling power level may be based on the comparison.

Abstract: A downlink beam frame signal processing system (100) for a communication satellite includes a packet switch (608) that routes self addressed uplink data to a memory (804). The memory (804) stores queues for at least a first and a second downlink beam hop locations (302, 304). The processing system (100) also includes a power amplifier (108) that amplifies a waveform formed using the uplink data. A power gating circuit (1200) coupled to the power amplifier (108) includes a power gate input (1216) responsive to a power gating signal to remove RF power from at least a portion of the waveform before transmission.

Abstract: A satellite signal receiver includes a satellite signal reception unit, timer, and power-on/off controlling element. The satellite signal reception unit calculates a current position of the satellite signal receiver using an electric wave from a satellite, in response to a positioning request. The timer is used to clock an elapsed time in calculating the current position of this receiver. The power-on/off controlling element controls an on/off state of power supplied to both the satellite signal reception unit and the timer on the basis of information including the positioning request, the elapsed time clocked by the timer, and a reception condition of the satellite signal reception unit. Accordingly, a period of time for supplying the power is automatically turned on/off to be shortened in cases the positioning is impossible, thus the power being saved.

Abstract: A method of determining transmission power of transmitted pilot symbols used for estimating channel coefficients in a transmission frame of a multicarrier transmission system having OFDM-CDMA, MC-CDMA, MC-CDM or MC-SS-MA frequency domain spreading sequences. The method includes determining a performance level to be achieved by the transmission, deducing the signal to noise ratio level introduced by the channel from the performance level to be achieved, deducing a single code transmission power Q0 of the pilot symbols for a single spreading code from the signal to noise ratio level, deducing an increase in power ? for transmitting the pilot symbols using a number of spreading codes K, and determining the transmission power Q of the pilot symbols at predetermined times, based on the following equations: Q=?(K?1)+Q0; K>1; ?>0; and Q0>?.

Abstract: The method provides power control in transmitting a downlink signal of frame data in a wireless network. Each frame is composed of timeslots, with each timeslot being further composed of quarter symbols. The method includes mapping each quarter symbol to an offset within a frame attenuation buffer, and computing a template for the frame, each step being performed only once. The template is used for filling the attenuation buffer with attenuation values to attenuate the transmit power for the downlink signal. Attenuation values are provided for each quarter symbol in a frame, although a computation is not required for each quarter symbol. The attenuation values are grouped in blocks that are recursively copied into the frame attenuation buffer based on the template. The contents of a filled attenuation buffer are output for use in attenuating the transmit power of the frame.

Abstract: A mobile wireless terminal (MWT) includes multiple wireless modems. The multiple modems have their respective transmit outputs combined to produce an aggregate transmit output. The multiple modems can concurrently transmit data in a reverse link direction and receive data in a forward link direction. The MWT is constrained to operate under an aggregate transmit power limit. Each of the multiple modems has an individual transmit limit related to the aggregate transmit power limit. When operating, over-limit ones of the multiple modems are deactivated and then reactivated to keep an aggregate transmit power of all of the modems below the aggregate limit, and to maximize data through-put on the forward and reverse links.

Abstract: The invention relates to a method (300, 400, 500) for controlling transmission power of a signal which is received using a certain number of rake fingers, where a value for a controlled variable is determined (303, 405) and the controlled variable value is compared (305) to a target value. The method according to the invention is characterized in that a discrepancy for the controlled variable is determined (304) using at least the number of rake fingers used in receiving the signal and said discrepancy is taken into account (305, 312) when comparing the controlled variable value to the target value. The invention relates also to a network element (600) and to a mobile station (610).

Abstract: A system and method for managing access to a satellite-based transponder by a plurality of aircraft each having a mobile radio frequency (RF) system. The system employs a ground-based, central control system for managing access to the satellite-based transponder so that the aggregate power spectral density (PSD) of the RF signals of all the mobile systems does not exceed, at any time, limits established by regulatory agencies to prevent interference between satellite systems. This is accomplished by a dual control loop arrangement for monitoring the signal-to-noise ratio (Eb/No) of the RF signal transmitted by the satellite-based transponder. A ground-based control loop is used whereby a ground-based central controller monitors the Eb/No and transmits commands to the aircraft (via the satellite transponder) to maintain the Eb/No of the transmitted signal within a predetermined range.

Abstract: Using conventional techniques, a common power control channel provides information used by mobile stations for power control operation of each mobile station. In accordance with the present invention, the common power control channel is also used to provide information used by the mobile stations for purposes other than the power control operation of each mobile station. In one embodiment, the information used for purposes other than power control operation comprises information instruction the mobile station to transition to an active state. In another embodiment, the information used for non-power control purposes is transmitted to mobile stations during periods in which the power control information is not being transmitted. Using a common power control channel in this manner substantially reduces the resources consumed by a mobile station while operating in a stand-by state.

Abstract: A method and a system for controlling transmission power that recover a target signal interference ratio (SIR) calculated on a terminal station side from a state where it has become excessively large to a state where the target SIR is normal as quickly as possible are provided.

Abstract: The present invention relates to a method of controlling at least one transmission parameter of a connection between a transmitting station (BS) and receiving station (MS0. The method comprises the steps of receiving at the receiving station a transmission signal from the transmitting station, determining from the received transmission signal whether there exists a power up requirement or a power down requirement, and monitoring the distribution of the power up and power down requirements over a period. If a predefined form of the distribution is detected, the quality target of the connection is changed. The present invention relates also to an arrangement and a receiving station for implementing the method.

Abstract: A packet-based downlink level control subsystem is provided for a wireless communication system. The subsystem includes a mechanism for embedding into each packet a power level code. The subsystem further includes a packet transmitter mechanism responsive to the embedded power level code for adjusting the power of the transmitted signal in accordance with the embedded power level code. This enables the transmitted power levels to be tailored to fit the needs of different individual receiving stations.

Abstract: Improved adjustment of transmission power in a communication system is provided. In one embodiment, in a point to multipoint communication system, transmission power of a subscriber unit is controlled based on power measurements made at a central access point. Power measurement information based on transmissions occurring at irregular intervals may be combined in a beneficial manner to control transmission output power. In one embodiment, a power regulation process determines a series of difference values indicating the differences between desired received power level at the central access point and measured received power level. A smoothing process is applied to the difference values. One or more parameters of the smoothing process vary with elapsed time since a last available power measurement.

Abstract: A method and system for Uplink Power Control in a satellite communication system comprising a geostationary satellite (2) communicating with a gateway station (3) applying the invention and at least two other gateway station (4) is described. The invention utilizes the existing communication signals in the satellite communication system to compensate for atmospheric distortion as scintillation and rain fading effects. The method is symmetric with regard to which gateway that utilizes the invention in a communication system thereby increasing the regulation of all communication signals in the system.

Abstract: In order to provide a software defined radio and an approval system of a radio which can flexibly cope with specification alteration, a software defined radio includes a storage for holding transmission and reception characteristic information serving as a specification criterion; and a control unit for comparing a measured value obtained from a measurement circuit with the information of the specification criterion and conducting setting of the radio so as to satisfy the specification.

Abstract: An uplink power control system for terminals in a satellite communication system provides closed loop power control using feedback signals generated at a satellite. The satellite performs inter-beam routing of uplink signals from satellite terminals, and processing of uplink signals to generate terminal transmission-specific feedback information that is transmitted in downlink signals to the terminals. The satellite also generates a beacon signal. An uplink power control algorithm at each terminal uses the beacon signal and feedback data to adjust transmit power.

Abstract: A wireless signal repeater that cuts off output transmission when the repeater is receiving less than a threshold level of input signal strength (e.g., too low or nonexistent). When operated in the reverse link of a cellular wireless system, the repeater advantageously reduces transmission of noise toward a cellular base station when the repeater is receiving no (or insufficient) signal from the a mobile station. Similarly, when operated in the forward link direction of a cellular wireless system, the repeater advantageously reduces transmission of noise toward a mobile station when the repeater is receiving no (or insufficient) signal from a base station.

Abstract: A system for conserving energy in a multi-node network (110) includes nodes (205) configured to organize themselves into tiers (305, 310, 315). The nodes (205) are further configured to produce a transmit/receive schedule at a first tier (310) in the network (110) and control the powering-on and powering-off of transmitters and receivers in nodes (205) in a tier adjacent (315) to the first tier (310) according to the transmit/receive schedule.

Abstract: The present invention relates to an amplifier system for satellites, in particular for radio-frequency amplifier systems incorporating travelling wave tube amplifiers and used in space repeaters. The amplifier system (1) includes two amplifier modules (A1, A2) each having an input and an output, a signal divider (D) having an input, a first output, and a second output, a signal combiner (C) having a first input, a second input and an output. The first output of the divider (D) is connected to the input of the first amplifier module (A1) via a connection length Le1. The second output of the divider (D) is connected to the input of the second amplifier module (A2) via a connection length Le2. The output of the first amplifier module (A1) is connected to the first input of the combiner (C) via a connection length Ls1. The output of the second amplifier module (A2) is connected to the second input of the combiner (C) via a connection length Ls2.

Abstract: An approach is provided for compensating for non-linearity in an overlaid radio communication system, such as a satellite network, wherein a terminal and a hub station communicates bi-directionally using a composite signal that is transmitted from a relay station and includes an inbound signal overlaid with an outbound signal. A look-up table stores information used to determine an inverse of a function associated with a non-linear effect of a received composite signal. The inbound signal has a predetermined spectral configuration. The device also includes a multiplier configured to generate a product of the look-up table and the received composite signal. Also, the device includes an estimation module configured to output an estimate of the inbound signal based upon the product.

Abstract: Control systems and methods for limiting the amount of input signal power that may be provided to a transmitter or transceiver unit within a satellite-based data communications system are disclosed. In one innovative aspect a DC current into a power amplifier provided within the transmitter or transceiver unit is monitored, either directly or indirectly, to determine when the power amplifier is approaching the limits of its normal or prescribed range of operation, and thereafter an application of input signal power to the transmitter or transceiver unit may be limited or discontinued.

Abstract: Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

Abstract: A method and apparatus for determining an efficient and reliable power level for the MS's transmitter for reverse link communications during a rescue procedure to rescue dropped calls quickly and with a high success rate is disclosed. A mobile station's mean rescue transmission output power level is computed by first determining the mobile station's mean receive input power level when the mobile station transmits during a connection rescue procedure. This mean receive input power level is then adjusted using up to four parameters. These four variables include (1) a pre-rescue power delta, (2) a rescue interference delta, (3) a rescue delay compensation value, and (4) a pre-determined value.

Abstract: An uplink power control system and method of the present invention includes a current sensing technique for predicting the P1 db power compression point. A dc current sensor detects the level of dc current transmitted from a control unit to an antenna unit of the system. The current measurements are analyzed to generate a theoretical prediction of amplifier linearity as the power levels are increased. The change in dc current indicates an inflection point where the amplifier no longer behaves linearly to an increase in RF power. Using this inflection point, an accurate assessment of the P1 db compression point of the system can be determined and the signal power levels adjusted accordingly.