Downtilt selection in a full dimensional multiple-input multiple-output system
First Claim
1. A user equipment (UE) operable to communicate reference signal information for selected downtilt angles in a cellular network, having computer circuitry configured to:
- receive, at the UE, a plurality of orthogonal frequency division multiple access (OFDMA) signals, wherein each received OFDMA signal is transmitted with a selected downtilt angle from a two dimensional antenna array of the enhanced Node B (eNode B);
communicate, to the eNode B, reference signal received power (RSRP) feedback information for each of the received OFDMA signals at the selected downtilt angles;
communicate, to the eNode B, received signal strength indicator (RSSI) feedback information to enable the UE to receive the OFDMA signals from the two dimensional antenna array at a downtilt angle with an increased signal to interference plus noise ratio (SINR);
determine interference from one or more nodes adjacent to the eNode B in the cellular network by using a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) with a time domain muting pattern for RSRP and interference measurement;
include interference from one or more nodes adjacent to the eNode B in the cellular network by calculating the RSSI by summing an averaged received power measured from a non-zero power (NZP) channel state information reference signal (CSI-RS) and an interference measurement resource (IMR); and
using a plurality of sub-IMRs for averaging interference and for testing one or more inter-cell interference, wherein the each of the plurality of sub-IMRs is a portion of the IMR and includes a subframe, a physical resource block (PRB) index, and a resource element (RE) index.
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Accused Products
Abstract
A technology for an enhanced node B (eNode B) in a cellular network that is operable to determine downtilt using full dimensional (FD) multiple-input multiple-output (MIMO). A plurality of orthogonal frequency division multiple access (OFDMA) signals can be transmitted, wherein each transmitted OFDMA signal is transmitted with a selected downtilt angle from a two dimensional antenna array of the eNode B. Reference signal received power (RSRP) feedback information can be received from a UE for each of transmitted OFDMA signals at the selected downtilt angles. Received signal strength indicator (RSSI) feedback information can be received from the UE. A reference signal received quality (RSRQ) can be calculated for each of the selected antennas angles using the RSRP feedback information and the RSSI feedback information. A downtilt angle can be selected for transmitting data from the eNode B with a highest signal to interference plus noise ratio (SINR).
13 Citations
16 Claims
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1. A user equipment (UE) operable to communicate reference signal information for selected downtilt angles in a cellular network, having computer circuitry configured to:
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receive, at the UE, a plurality of orthogonal frequency division multiple access (OFDMA) signals, wherein each received OFDMA signal is transmitted with a selected downtilt angle from a two dimensional antenna array of the enhanced Node B (eNode B); communicate, to the eNode B, reference signal received power (RSRP) feedback information for each of the received OFDMA signals at the selected downtilt angles; communicate, to the eNode B, received signal strength indicator (RSSI) feedback information to enable the UE to receive the OFDMA signals from the two dimensional antenna array at a downtilt angle with an increased signal to interference plus noise ratio (SINR); determine interference from one or more nodes adjacent to the eNode B in the cellular network by using a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) with a time domain muting pattern for RSRP and interference measurement; include interference from one or more nodes adjacent to the eNode B in the cellular network by calculating the RSSI by summing an averaged received power measured from a non-zero power (NZP) channel state information reference signal (CSI-RS) and an interference measurement resource (IMR); and using a plurality of sub-IMRs for averaging interference and for testing one or more inter-cell interference, wherein the each of the plurality of sub-IMRs is a portion of the IMR and includes a subframe, a physical resource block (PRB) index, and a resource element (RE) index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An enhanced node B (eNode B) operable to determine downtilt using full dimensional (FD) multiple-input multiple-output (MIMO) in a cellular network, having computer circuitry configured to:
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transmit a plurality of orthogonal frequency division multiple access (OFDMA) signals, wherein each transmitted OFDMA signal is transmitted with a selected downtilt angle from a two dimensional antenna array of the eNode B; receive, from a user equipment (UE), reference signal received power (RSRP) feedback information for each of transmitted OFDMA signals at the selected downtilt angles; receive, from the UE, received signal strength indicator (RSSI) feedback information; calculate a reference signal received quality (RSRQ) for each of the selected antennas angles using the RSRP feedback information and the RSSI feedback information; calculate an inferred inter-node interference value based on the selected downtilt angles; and select a downtilt angle for transmitting data from the eNode B with a highest signal to interference plus noise ratio (SINR); determine a channel state information reference signal (CSI-RS) based RSRQ using a non-zero power CSI-RS and a channel state information interference measurement (CSI-IM); calculate an RSRQ for a selected downtilt using an RSRP that corresponds to the sub CSI-RS, wherein the UE includes interference from one or more nodes adjacent to the eNode B in the cellular network by calculating the RS SI by summing an averaged received power measured from the NZP CSI-RS and an interference measurement resource (IMR) and uses the plurality of sub-IMRs for averaging interference and for testing one or more inter-cell interference, wherein the each of the plurality of sub-IMRs is a portion of the IMR and includes a subframe, physical resource block (PRB) index, and a resource element (RE) index. - View Dependent Claims (10, 11, 12, 13)
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14. A method to determine downtilt using full dimensional (FD) multiple-input multiple-output (MIMO) of an evolved node B (eNode B) in a cellular network, comprising:
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transmitting an orthogonal frequency division multiple access (OFDMA) signal at selected downtilt angles from a two dimensional antenna array of the eNode B; receiving, from a user equipment (UE), reference signal received power (RSRP) feedback information for each of the selected downtilt angles; receiving, from the UE, received signal strength indicator (RSSI) feedback information; calculating a reference signal received quality (RSRQ) for each of the selected antennas angles using the RSRP feedback information and the RSSI feedback information; calculate an inferred inter-node interference value based on the selected downtilt angles; selecting a downtilt angle for transmitting data from the eNode B with a highest RSRQ value; determine interference from one or more nodes adjacent to the eNode B in the cellular network by using a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) with a time domain muting pattern for RSRP and interference measurement; calculate an RSRQ for a selected downtilt using an RSRP that corresponds to the sub CSI-RS, wherein the UE includes interference from one or more nodes adjacent to the eNode B in the cellular network by calculating the RS SI by summing an averaged received power measured from the NZP CSI-RS and an interference measurement resource (IMR) and uses the plurality of sub-INRs for averaging interference and for testing one or more inter-cell interference, wherein the each of the plurality of sub-INRs is a portion of the IMR and includes a subframe, physical resource block (PRB) index, and a resource element (RE) index. - View Dependent Claims (15, 16)
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Specification