Distributed antenna system and method for enhanced positioning
First Claim
1. An enhanced Node-B (eNB) to operate as part of a distributed antenna system (DAS) comprising one or more nodes having a same cell identifier (ID) and operating within a same cell as the eNB, the eNB arranged to:
- transmit a user equipment (UE)-specific reference signal and a cell-specific reference signal;
configure one or more of the other nodes of a cell to transmit UE-specific reference signals, each of the UE-specific reference signals transmitted by each of the one or more of the other nodes being distinguishable from each of the UE-specific reference signals transmitted by each other node of the one or more of the other nodes and from the UE-specific reference signal that is transmitted by the eNB, the nodes comprising remote radio heads (RRHs); and
receive location estimate information from a UE that is determined at least in part from the UE-specific reference signals and the cell-specific reference signal, wherein each of the UE-specific reference signals comprises a channel state information reference signal (CSI-RS) and the cell-specific reference signal comprises a positioning reference signal (PRS), wherein the location estimate information comprises an initial location estimate obtained using the received PRS and a PRS received from one or more other cells, an update of the initial location estimate obtained using the received CSI-RS from the eNB and the CSI-RSs received from the RRHs of the cell, and feedback indicative of channel estimations, obtained using the CSI-RS from the eNB and the CSI-RSs from one or more of the RRHs, for use by the eNB and the RRHs for cooperative orthogonal frequency division multiple access (OFDMA) transmissions.
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Accused Products
Abstract
Embodiments of a distributed antenna system (DAS) and method for enhanced positioning in a wireless network are generally described herein. In some embodiments, an enhanced Node-B (eNB) operates as part of a DAS that includes one or more nodes having the same cell ID as the eNB. The eNB is to transmit a UE-specific reference signal and configure one or more of the other nodes of the cell to transmit UE-specific reference signals that are distinguishable from each other and from the UE-specific reference signal that is transmitted by the eNB. The eNB may receive location estimate information from user equipment (UE) that is determined at least in part from the UE-specific reference signals. The eNB may also configure the nodes to perform cooperative OFDMA transmission techniques for the UEs operating in the cell.
5 Citations
22 Claims
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1. An enhanced Node-B (eNB) to operate as part of a distributed antenna system (DAS) comprising one or more nodes having a same cell identifier (ID) and operating within a same cell as the eNB, the eNB arranged to:
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transmit a user equipment (UE)-specific reference signal and a cell-specific reference signal; configure one or more of the other nodes of a cell to transmit UE-specific reference signals, each of the UE-specific reference signals transmitted by each of the one or more of the other nodes being distinguishable from each of the UE-specific reference signals transmitted by each other node of the one or more of the other nodes and from the UE-specific reference signal that is transmitted by the eNB, the nodes comprising remote radio heads (RRHs); and receive location estimate information from a UE that is determined at least in part from the UE-specific reference signals and the cell-specific reference signal, wherein each of the UE-specific reference signals comprises a channel state information reference signal (CSI-RS) and the cell-specific reference signal comprises a positioning reference signal (PRS), wherein the location estimate information comprises an initial location estimate obtained using the received PRS and a PRS received from one or more other cells, an update of the initial location estimate obtained using the received CSI-RS from the eNB and the CSI-RSs received from the RRHs of the cell, and feedback indicative of channel estimations, obtained using the CSI-RS from the eNB and the CSI-RSs from one or more of the RRHs, for use by the eNB and the RRHs for cooperative orthogonal frequency division multiple access (OFDMA) transmissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17, 18, 19)
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12. User Equipment (UE) arranged for receipt of cooperative orthogonal frequency division multiple access (OFDMA) transmissions from an enhanced Node-B (eNB) and one or more remote radio heads (RRHs) of a cell,
wherein the UE is arranged to: -
receive a UE-specific reference signal from the eNB, a cell-specific reference signal comprising a channel state information reference signal (CSI-RS) from a current cell and a cell-specific reference signal comprising a positioning reference signal (PRS) from one or more neighbor cells; receive UE-specific reference signals from one or more of the RRHs, each of the UE-specific reference signals from each of the one or more of the RRHs being distinguishable from each of the UE-specific reference signals from each other RRH of the one or more of the RRHs and from the UE-specific reference signal received from the eNB; generate a location estimate at least in part from the UE-specific reference signals; determine an initial location estimate from the cell-specific reference signal; update the location estimate using the UE-specific reference signals; perform channel estimations using the CSI-RS from the eNB and the CSI-RSs from each of the RRHs; report an updated location estimate to the eNB; and provide feedback to the eNB indicative of the channel estimations for use by the eNB and the RRHs for cooperative OFDMA transmissions. - View Dependent Claims (20)
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13. A method performed by an enhanced Node-B (eNB) arranged to operate as part of a distributed antenna system (DAS) comprising one or more nodes having a same cell identifier (ID) and operating within a same cell as the eNB, the method comprising:
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transmitting a user equipment (UE)-specific reference signal and a cell-specific reference signal comprising a positioning reference signal (PRS); configuring one or more of the other nodes of a cell to transmit UE-specific reference signals comprising a channel state information reference signal (CSI-RS), each of the UE-specific reference signals transmitted by each of the one or more of the other nodes of the cell being distinguishable from each of the UE-specific reference signals transmitted by each other node of the one or more of the other nodes of the cell and from the UE-specific reference signal that is transmitted by the eNB, the nodes comprising remote radio heads (RRHs); and receiving location estimate information from a UE that is determined at least in part from the UE-specific reference signals and the cell-specific reference signal, the location estimate information comprising an initial location estimate obtained using the received PRS and a PRS received from of one or more other cells, an update of the initial location estimate obtained using the received CSI-RS from the eNB and the CSI-RSs received from the RRHs of the cell, and feedback indicative of channel estimations, obtained using the CSI-RS from the eNB and the CSI-RSs from one or more of the RRHs, for use by the eNB and the RRHs for cooperative OFDMA transmissions. - View Dependent Claims (14, 15, 16)
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21. A non-transitory machine readable medium comprising instructions that, when executed by a user equipment (UE), cause the UE to perform operations to receive cooperative orthogonal frequency division multiple access (OFDMA) transmissions from an enhanced Node-B (eNB) and one or more remote radio heads (RRHs) of a cell, the operations comprising:
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receiving a UE-specific reference signal from the eNB, a cell-specific reference signal comprising a channel state information reference signal (CSI-RS) from a current cell and a cell-specific reference signal comprising a positioning reference signal (PRS) from one or more neighbor cells; receiving UE-specific reference signals from one or more of the RRHs, each of the UE-specific reference signals from each of the one or more of the RRHs being distinguishable from each of the UE-specific reference signals from each other RRH of the one or more of the RRHs and from the UE-specific reference signal received from the eNB; generating a location estimate at least in part from the UE-specific reference signals; determining an initial location estimate from the cell-specific reference signal; updating the location estimate using the UE-specific reference signals; performing channel estimations using the CSI-RS from the eNB and the CSI-RSs from each of the RRHs; reporting an updated location estimate to the eNB; and providing feedback to the eNB indicative of the channel estimations for use by the eNB and the RRHs for cooperative OFDMA transmissions. - View Dependent Claims (22)
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Specification