Robust downlink power control in wireless

The present disclosure is not meant to be limited to the types of MAC PDUs that require more robust acknowledgement, and this will be appreciated by those skilled in the art. In both above-mentioned cases, i. Otherwise, the comparing means 30 outputs a no signal to the power setting means 31 which indicates to the amplifier 26 to continue to use the normal lower transmission power for the current MAC frame.

Hong Kong, April Femtocells are currently deployed to be operated in closed access mode, restricting access to the femtocells to subscribed home users only. In case of applying uplink discontinuous transmission functionality the invention proposes to average over a definable number of received so-called silent descriptor frames in uplink, in particular over three silent descriptor frames to obtain stabilized average values with less spread.

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This is the case for example when using uplink discontinuous transmission DTX. Recent work has also considered the combination of CDMA and antenna array signal processing e.

Consequently it is assumed that the pathloss in uplink and the pathloss Robust downlink power control in wireless downlink substantially behave the same way. For example, differentiating factors include different cyclic shifts, or different frequency blocks which are indicated by PDCCHs.

Moreover the inventive feature can be implemented without the need for undue hardware changes and can be done remotely, in particular via loading new operating software into the base station, so that no site visits are necessary to implement the feature.

Thereby, the increased power level transmission according to the present invention only concerns the transmission of downlink information, i.

Computer simulations show that the SDR step does not involve any approximation as the resulting solution is always rank-one. Robust downlink power control in wireless, the mobile terminal advantageously comprises means for setting the regular time intervals on the basis of a current medium access control frame number and a repetition rate.

This is equiva- lent to computing each wk as the solution to the following maximization problem: Since it is proposed to use the same downlink transmission power for all mobile terminals, the transmission power should be chosen so that all mobile terminals in one cell have sufficient reception. Eldar, Alex Gershman - in Proc.

Instead of transmitting the repetition rate to the mobile terminals a fixed repetition rate could be stored in the base station and the mobile stations, respectively.

In this paper, we study a family of robust power allocation techniques for multi-input multi-output communication systems with incomplete channel state information at the transmitter side.

SCMA for Downlink Multiple Access of 5G Wireless Networks

In a similar manner, signals to be transmitted are processed, including modulation and encoding for example, by DSP and input to transmitter for digital to analog conversion, frequency up conversion, filtering, amplification and transmission over the communication network via antenna However, fect knowledge of the downlink channel, the QoS constraints this means that the total transmitted power 6 can be fur- 7 may become violated for some of the users.

Moreover, for the case where the instantaneous channel realization of Bob is known to Alice, we As antennas become smaller and cheaper relative to up-conversion chains, transmit antenna selection at the base station becomes increasingly appealing in this context.

Even if fast power control is just one of several techniques to enhance spectral efficiency it has the potential to be implemented in a network without undue need of hardware changes as described above, but simply by implementing a respective software product adapted to the specific network constrains.

Thus, the adjusting means of the mobile terminal has to be able to adjust the processing means in correspondence to the schedule of the transmission with an increased transmission power level by the base station of the present invention.

The detecting means 65 is adapted to receive the announcement information transmitted before the increased power level transmission, reads the correspondingly contained information such as the starting point, the power level and number of consecutive MAC frames transmitted with the increased power level and controls the adjusting means 64 correspondingly.

Enhanced Node B includes a communications subsystem for communication with user equipment and further for receiving data from a network. The intended scope of the techniques of this application thus includes other structures, systems or methods.

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In the present paper, we show that these results extend to the case of antenna arrays. In particular for network operators having a small spectrum less or equal 5MHzwhich is typically the case for the United States, any technique which enhances spectral efficiency is appreciated.

Robust linear MIMO in the downlink: a worst-case optimization with ellipsoidal uncertainty regions

For example, in [8, 13], the problem of optimal cen- to-interference-plus-noise ratios SINRs satisfy the system tralized power control and downlink beamforming is consid- quality of service QoS requirements [1]. As will be appreciated by those skilled in the art, the downlink arrows of FIG.

Communication method according to claim 22, characterized in, that said certain time intervals are random time intervals whereby at least a broadcast control channel and a frame control channel of a respective medium access control frame are transmitted after a randomly set number of medium access control channels has been transmitted with a lower transmission power.

In this case, the base station according to the present invention advantageously comprises a random number generating means for generating a random number for each MAC frame to be transmitted, whereby the power control means sets the random time intervals on the basis of the random numbers, a respective current medium access control frame number and a repetition rate.

Communication method according to claim 22, characterized in, that said certain time intervals are regular time intervals whereby at least a broadcast control channel and a frame control channel of a respective medium access control frame are transmitted regularly with said increased transmission power level after a fixed number of medium access control frames have been transmitted with a lower transmission power.

The mobile terminals are then able to adapt their receiving processing to the reception of increased power levels by implementing the same scheduling algorithm as the base station.

This is an expected simulation runs with randomly changing error matrices Ei. In [1], it was shown that under some conditions, the user capacity of an uplink power-controlled CDMA cell for several important linear receivers can be very simply characterized via a notion of effective bandwidth.

Based thereon it is obvious for a person skilled in the art that the effects of Rayleigh fading should be avoided or reduced as far as possible to significantly improve the inventive fast power control approach.

One possibility is to assign downlink transmitter power independently to each mobile terminal communicating with the respective base station. In case that the calculation result from the calculating means 54 is 0, the comparing means 55 outputs a yes signal to an adding means 56, which adds the current MAC frame number FN to the respective pseudo random number PRN for this current MAC frame number.

The normal MAC frames transmitted during the certain time intervals between the increased power transmission are transmitted under a normal slow or a semistatic power control, so that the effective cell size is limited during these certain time intervals to the actually active mobile terminals.

This motivated the development of robust downlink beamforming techniques of [8] and [10] that explicitly take into account potential mismatches between the B.In this paper, the performance of the robust power control algorithm proposed in [1] is analyzed for the case of hybrid channel state information [2], and compared to a non-robust algorithm, when a different number of transmitting base stations is considered.

simple centralized downlink power control method is proposed for cellular wireless communication systems using code division multiple access (CDMA) or space division multiple access (SDMA).

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL,NO.8,AUGUST Polyblock Algorithm-Based Robust Beamforming for Downlink Multi-User Systems With Per-Antenna Power Constraints robust beamforming, per-antenna power constraints, quantized CDI, polyblock algorithm, weighted sum-rate. I. Downlink Power Control in Two-Tier Cellular OFDMA Networks Under Uncertainties: A Robust Stackelberg Game Abstract: We consider the problem of robust downlink power control in orthogonal frequency-division multiple access (OFDMA)-based heterogeneous wireless networks (HetNets) composed of macrocells and underlaying small cells.

3 Robust Power Control with General Uncertainty Sets In this subsection we consider the robust formulation of Problem (2) under general row-wise uncertainty sets in the normalized channel matrix F.


We present a model for efficient and robust power control in the downlink of Wideband CDMA wireless systems. The model is based on microeconomics, and takes into account both the congestion, in terms of increased interference, that a mobile user imposes to other users, and the downlink resource.

Robust downlink power control in wireless
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