Abstract:
Various aspects of the present disclosure provide for conditionally disabling discontinuous reception (DRX). For example, DRX may be disabled if there is a loss of DRX synchronization, a loss of signal radio bearer traffic, a poor radio frequency condition, a low signal-to-interference ratio estimate, a low transmit power condition, or a drop in transmit power. Various aspects of the present disclosure provide for determining that an access terminal and the network are not in synchronization (e.g., DRX synchronization), and attempting to re-synchronize the access terminal and the network. In cases where a loss of DRX synchronization involves one entity having DRX enabled while another entity has DRX disabled, DRX may be temporarily disabled until synchronization is restored. In cases where a loss of DRX synchronization involves different entities using different subframe indices, the subframe index used by one of the entities may be changed to restore synchronization.
Abstract:
Method carried out in a wireless user equipment (UE), and corresponding UE, for lowering the vulnerability of a call to being dropped by assuring sufficient cell diversity in the active set of the UE when the value of the traffic-to-pilot ratio (TPR) exceeds a certain threshold, the method including: starting a time-to-trigger (TTT) interval associated with a neighbor cell in preparation for potential handover of the UE to the neighbor cell according to network- assigned parameters, monitoring a TPR associated with a DL-DPCH of a serving cell of the UE, determining that the TPR exceeds a TPR threshold, shortening the TTT interval upon that determination and transmitting, based on the shortened TTT interval, a Measurement Report Message (MRM) to a network to add the neighbor cell to an active set associated with the UE.
Abstract:
Various aspects of the present disclosure provide methods and apparatuses that may provide for more efficient usage of time-to-trigger (TTT) timers in a wireless communication system, such that stopping or resetting of the TTT timer in response to receiving various measurement control messages (MCMs) can be limited to times when such stopping or resetting is appropriate.
Abstract:
Disclosed are systems and methods for controlling by the User Equipment (UE) downlink power in early decode termination mode. In one aspect, the UE may be configured to perform early decoding of a downlink (DL) transmission from a base station. The UE further configured to estimate a signal-to-interference ratio (SIRE) of the DL transmission. Based on the SIRE, the UE is configured to select a Transmission Power Control (TPC) command sequence for a low power mode of operation of the UE in which a receiver is powered down. The UE is further configured to activate the low power mode and transmit the selected TPC command sequence to the base station to adjust a DL transmission power during the low power mode.
Abstract:
Aspects of the disclosure are directed to estimating a signal to interference ratio. A signal energy estimate corresponding to a received data transmission is generated. A noise to interference ratio estimate corresponding to the received data transmission is generated. A bias, corresponding to the noise to interference ratio estimate, is subtracted from the signal energy estimate. A signal to interference ratio estimate is determined corresponding to the signal energy estimate less the bias, and the noise to interference ratio estimate.
Abstract:
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may obtain a measurement of a radio condition from a radio frequency signal received at a first antenna and enable receive diversity for further measurements of the radio condition when a metric of the radio condition does not meet a predefined threshold value. A probability of occurrence of an out-of-service state may be reduced by measuring the radio condition using further measurements using receiver diversity. The further measurements of the radio condition may be based on whether one version of the signal has greater energy than the other versions of the signal. The further measurements of the radio condition may obtained by combining received versions of the signal utilizing combination diversity to obtain a combined signal strength/energy.
Abstract:
Aspects of the methods and apparatus relate to improving the overall decision quality of the Fractional-Dedicated Physical Channel (F-DPCH) channel. One aspect of the methods and apparatus relates to detecting bad channel conditions of a serving base station and improving the serving base station F-DPCH decoding performance in such bad conditions based on the serving base station signal-to interference ratio (SIR) estimation. Another aspect of the methods and apparatus relate to improving the overall decision quality of the F-DPCH channel in soft handover (HO) scenarios by increasing the non-serving base station F-DPCH channel rejections thresholds based on certain SIR estimations. The F-DPCH channel rejections thresholds are based on either the SIR of the non-serving base station, or a difference between non-serving base station SIR and serving base station SIR.
Abstract:
Methods and apparatus are described for performing cell selection for reducing an initial acquisition time between a user equipment (UE) and a network entity, comprising measuring a signal from a cell, the signal including at least one system information block (SIB), wherein the at least one SIB includes a plurality of cell selection threshold values; attempting to decode the at least one SIB; determining, in response to successfully decoding the at least one SIB, whether one or more measurements of the signal pass or fail a cell selection criteria check that includes the plurality of cell selection threshold values; determining, in response to the cell selection criteria check failing, whether the plurality of cell selection threshold values are within range of a plurality of corresponding minimum network threshold values; and performing a cell selection procedure on the cell in response to determining that the plurality of cell selection threshold values are within range of the plurality of corresponding minimum network threshold values.
Abstract:
Disclosed are systems and methods for controlling by the User Equipment (UE) downlink power in early decode termination mode. In one aspect, the UE may be configured to perform early decoding of a downlink (DL) transmission from a base station. The UE further configured to estimate a signal-to-interference ratio (SIRE) of the DL transmission. Based on the SIRE, the UE is configured to select a Transmission Power Control (TPC) command sequence for a low power mode of operation of the UE in which a receiver is powered down. The UE is further configured to activate the low power mode and transmit the selected TPC command sequence to the base station to adjust a DL transmission power during the low power mode.
Abstract:
Disclosed are methods and apparatus for rejecting unreliable downlink (DL) transmit power control (TPC) commands based on signal-to-interference-ratio estimates (SIRE). The method includes receiving by a user equipment (UE) a DL transmit power control (TPC) command from a base station; calculating a signal-to-interference ratio estimate (SIRE) for the DL channel; determining a scaling factor for a DLTPC rejection threshold based on the DL channel SIRE; adjusting the DLTPC rejection threshold based on the determined scaling factor; and rejecting or accepting the DLTPC command based on the adjusted DLTPC rejection threshold.