Abstract:
PROBLEM TO BE SOLVED: To improve use of a forward link by high rate packet data transmission and to decrease a transmission delay in a data communication system capable of variable rate transmission. SOLUTION: Data transmission on the forward link is time multiplexed and a base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and apparatus for transmitting/receiving variable rate data. SOLUTION: In this method for transmitting/receiving variable rate data, the data are spread by using a long pseudo-noise code generated by a linear feedback PN generator (16), and the mask is selected by a mask selector (14), in accordance with the transmission rate of the variable data and the specific user who transmits the data. Thus, the data rate can be determined by identifying which mask allows the received waveform to be correctly despread at the receiver. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
The present patent application comprises a method and apparatus for multiplexing reverse link feedback channels on a single reverse link frequency supporting multiple forward link frequencies for forward link channels, comprising assigning the reverse link frequency to a mobile station, assigning one or more of the forward link frequencies to the reverse link frequency, and code division multiplexing a plurality of the reverse link feedback channels on the reverse link frequency.
Abstract:
The present invention comprises a method of communicating background noise comprising the steps of transmitting background noise, blanking subsequent background noise data rate frames used to communicate the background noise, receiving the background noise and updating the background noise.
Abstract:
A transmitter directed, distributed receiver using multi-user diversity provided by the distribution of the receiver. Advantage is taken of the uncorrelated variations over time in the condition of communication links between a common transmitter and several users. The greater the variation in the quality of a particular link over time, the greater the increase in total system throughput provided. An scheduler metric (or scheduler metric) represents the instantaneous quality of the communication link between each user and the transmitter with respect to the average quality of the link. Alternatively, the scheduler metric represents the instantaneous channel condition with respect to the average data throughput over that channel. The common transmitting station uses the scheduler metric to directly compare the desirability of granting each channel access with the desirability of granting each other channel access. The users with links that have the greatest scheduler metric are provided access to the channels.
Abstract:
Systems and techniques are disclosed relating to communications. The systems and techniques involve measuring a quality of a transmission from a remote location, identifying a data rate as a function of the measured quality, the identified data rate being capable of supporting a plurality of packet lengths, selecting one of the packet lengths as a function of a parameter of the measured quality, and providing feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.
Abstract:
For determining use of receive diversity in a mobile station, a control system (210 or 401) determines a demand level for use of communication resources. A transmitter (300) communicates a message indicating use of receive diversity at a mobile station based on the determined demand level. In another aspect, a receiver (200) receives a channel and determines transmit power level of the channel for being at a lower or upper transmit power level limit. The control system (210 or 401) controls receive diversity by selecting a number of receiver chains (290) based on the determined transmit power level. In another aspect, receiver (200) receives a channel and determines a channel condition of the channel and duration of the channel condition. Control system (210 or 401) controls receive diversity by selecting a number of receiver chains (290) based on the determined channel condition and the duration.
Abstract:
A method and apparatus for controlling the transmit power of a plurality of mobile radio units (800) transmitting to a base station (900) in a mobile radio telephone system. For each of the mobile units (800) in the system, a signal strength estimate is measured at the base station (900) based on reverse link signals sent from the mobile units (800) and received at the base station (900), wherein each signal strength estimate is associated with one of the mobile units (800). The signal strength estimate associated with each mobile unit (800) is compared to a threshold. Next, for each mobile unit (800) in the plurality of mobile units (800), if the signal strength estimate associated with the mobile unit (800) is greater than the threshold, then a power control bit having a first value is assigned to the mobile unit (800); conversely, if the signal strength estimate associated with the mobile unit is less than the threshold, then a power control bit having a second value is assigned to the mobile unit (800). A variable gain that is a function of the difference between the signal strength estimate associated with the mobile unit (800) and the threshold is next applied to each power control bit. The variable gain applied to each power control bit increases as the magnitude of the difference between the signal strength estimate associated with the mobile unit (800) and the threshold increases. Each gain-adjusted power control bit is then transmitted to the mobile units (800).
Abstract:
Transmit power (e.g., maximum transmit power) may be defined based on the maximum received signal strength allowed by a receiver and a minimum coupling loss from a transmitting node to a receiver. Transmit power may be defined for an access node (e.g., a femto node) such that a corresponding outage created in a cell (e.g., a macro cell) is limited while still providing an acceptable level of coverage for access terminals associated with the access node. An access node may autonomously adjust its transmit power based on channel measurement and a defined coverage hole to mitigate interference. Transmit power may be defined based on channel quality. Transmit power may be defined based on a signal-to-noise ratio at an access terminal. The transmit power of neighboring access nodes also may be controlled by inter-access node signaling.
Abstract:
Embodiments disclosed herein relate to methods and systems for providing improved position-location (e.g., time-of-arrival) measurement and enhanced position location in wireless communication systems. In an embodiment, an access point may replace information (e.g., data) transmission by a "known" transmission (or "reference transmission") at a predetermined time known to access terminals in the corresponding sectors. The access terminals may use the received reference transmission to perform a position-location measurement, and report back the measured information. The access point may also send a reference transmission on demand, e.g., in response to a request from an access terminal in need for a location-based service.