Rakuten Symphony, Inc.

Ronak Bharatkumar Lalwala

Raghavendra Madanahally Ramakrishna

Siddhant Gupta

Vivek Jha

Venkatesh Hampasandra Muralidhara

Hari Swaroop Kanzal Venkatesha

Rajesh Teli

Vijayakumar Yalamalli

Manuj Mohan Khanra

Anurag Gupta

Vihang Kamble

In general, the current subject matter relates to transmission of channel state information reference signals (CSI RSs). In some implementations, a message can be received at a radio unit (RU) of a base station in a wireless communication system. The message can include channel state information reference signal (CSI RS) configuration information that the RU is configured to use in generating a CSI RS for transmission to a user equipment (UE). The CSI RS configuration information can include a plurality of parameters including a bandwidth for CSI RS transmission, amplitude scaling, and a scrambling identity (ID).

Transmission of channel state information reference signals

Techniques for selecting layers and ports for Multiple-Input-Multiple-Output (MIMO) beamforming are provided. In some implementations, the techniques may include receiving a plurality of Sounding Reference Signals (SRSs) transmitted by a plurality of SRS ports, each of the plurality of SRSs corresponding with a SRS port of a UE. In addition, the techniques may include measuring a Signal-to-Noise Ratio (SNR) for each of the plurality of SRS ports, and estimating a wideband channel port correlation matrix across the plurality of SRS ports. The techniques may include setting a correlation threshold and a SNR threshold. Further, the techniques may include selecting one or more SRS ports from the plurality of SRS ports that satisfy a condition of being equal to or less than the correlation threshold and equal to or greater than the SNR threshold, where the layers correspond with a total number of SRS ports that satisfy the above condition.

SRS layer and port estimation for uplink and downlink transmission

A method performed in an O-DU includes dividing a transmission time unit (TTI) into a plurality of symbol units, the TTI corresponding to a permitted time for transmission of data from the O-DU to the O-RU via the fronthaul link. The method further includes allocating a first packet of a first type to a first symbol unit. The method further includes, in response to determining (i) a size of the first packet of the first type is less than a size of the first symbol unit and (ii) a first packet of a second type associated with the first packet of the first type is available for transmission, allocating the first packet of the second type to the first symbol unit. The method further includes transmitting the first symbol unit with the first packet of the first type and the first packet of the second type to the O-RU.

Method and apparatus for statistical multiplexing for fronthaul bandwidth in open random access networks

Techniques for reducing power consumption in a radio unit are disclosed. The techniques include determining a number of Multiple-Input-Multiple-Output (MIMO) antenna elements of a MIMO antenna panel required to serve one or more User Equipment (UEs), identifying a number of MIMO antenna elements of the MIMO antenna panel not needed to serve the UEs. The techniques include sending, from an Open Radio Network (O-RAN) Distributed Unit (O-DU) to a O-RAN Radio Unit (O-RU), a beamforming weight of zero assigned to the MIMO antenna elements identified as not needed to serve the one or more UEs, the beamforming weight being sent in a digital domain via a Control plane (C-plane). The MIMO antenna elements assigned the beamforming weight of zero may be disabled thereby reducing the power consumption of the O-RU. Artificial Intelligence algorithms may be implemented to dynamically determine areas where the O-RAN should have more coverage or less coverage.

System and method for power saving in an ORAN with intelligent beamforming weights

A method of estimating beamforming weights, the method including receiving a Sounding Reference Signal (SRS) at an Open Radio Access Network (O-RAN) Distributed Unit (O-DU); performing channel estimation of the SRS received; computing a time domain response on the SRS channel estimation at a level of granularity as defined by a bandwidth of the SRS; determining a timing offset at the defined level of granularity; compensating for the timing offset at the defined level of granularity; estimating the beamforming weights according to the compensated timing offset; and transmitting the estimated beamforming weights to an O-RAN Radio Unit (O-RU) over a fronthaul interface between the O-DU and the O-RU.

Sounding reference signal beamformer enhancement with timing correction

A method performed in at least one processor of a network node includes receiving, from at least one user equipment (UE) over a wireless communication network, a plurality of physical random access channel (PRACH) preamble sequences in the frequency domain. The method further includes determining, in the frequency domain, an average of the received plurality of preamble sequences. The method further includes performing a correlation function between the average of the received plurality of preamble sequences and a base sequence. The method further includes converting an output of the correlation function to the time domain to generate time domain samples in a sampling window. The method further includes determining power samples from the time domain samples. The method further includes performing a search of the power samples in the sampling window for a peak corresponding to the plurality of PRACH preamble sequences.

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Bengaluru, India

Ronak Bharatkumar Lalwala