Distributed FD-MIMO: cellular evolution for 5G and beyond

Patent metadata

Field	Value
Publication number	US-10972158-B2
Application number	US-201815921521-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 16, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A method for a user equipment (UE) is provided. The method comprises receiving, from a base station (BS), information via a dynamic signaling comprising at least one of a medium access control channel element (MAC CE) or downlink control information (DCI) that includes information for a set of channel state information-reference signal (CSI-RS); identifying CSI-RS resources each of which comprises a set of antenna ports based on the information; and measuring CSI using an aggregation of the CSI-RS resources, wherein an energy per resource element (EPRE) ratio between a CSI-RS and a physical downlink shared channel (PDSCH) is configured in the information to each of the CSI-RS resources comprising the aggregated CSI-RS resources.

First claim

What is claimed is:

1. A user equipment (UE) comprising:
a transceiver configured to receive, from a base station (BS) in a cell comprising antenna elements distributed within the cell, information, via a dynamic signaling comprising at least one of a medium access control channel element (MAC CE) or downlink control information (DCI), that indicates a set of channel state information-reference signal (CSI-RS) resources; and
a processor operably connected to the transceiver, the processor configured to:
identify CSI-RS resources, each of which comprises a set of antenna ports, based on the received information, wherein the set of antenna ports is configured based on a cluster of multiple of the distributed antenna elements, the multiple distributed antenna elements clustered based on intercell interference mitigation, wherein the cluster of distributed antenna elements includes (i) first antenna elements clustered based on a path loss to the UE and (ii) second antenna elements corresponding to one or more other UEs that meet an interference condition; and
measure CSI using an aggregation of the CSI-RS resources, wherein an energy per resource element (EPRE) ratio between the CSI-RS resources and an associated physical downlink shared channel (PDSCH), respectively, is configured in the received information indicating the CSI-RS resources,
wherein clustering of the cluster of multiple distributed antenna elements and the inter cell interference mitigation are based on antenna sharing radius that is larger than a radius of the cell.

2. The UE of claim 1 , wherein the transceiver is further configured to receive the information via a radio resource control (RRC) signaling.

3. The UE of claim 1 , wherein:
the processor is further configured to determine a dedicated physical random access channel (PRACH); and
the transceiver is further configured to:
transmit, to the BS, an uplink signaling through the PRACH; and
receive, from the BS, a random access response (RAR) including a set of CSI-RS antenna ports that is used by the UE to measure CSI acquisition.

4. The UE of claim 1 , wherein:
the processor is further configured to determine a dedicated physical random access channel (PRACH) preamble based on a physical downlink control channel (PDCCH) order; and
the transceiver is further configured to transmit the dedicated PRACH preamble over an uplink channel.

5. The UE of claim 1 , wherein:
EPRE ratio information per each of the CSI-RS resources is indicated in at least one of an aperiodic CSI-RS triggering and an aperiodic CSI report triggering; and
the EPRE ratio configured for each of the CSI-RS resources is selected from a set of variable values configured via an RRC signaling.

6. The UE of claim 1 , wherein:
the cluster of multiple distributed antenna elements is dynamically allocated at a same time to a plurality of UEs including the UE and the one or more other UEs, and
at least one of the distributed antenna elements in the cluster is shared by a different UE in another cell.

7. The UE of claim 1 , wherein:
the interference condition comprises a mutual signal-to-interference ratio (SIR) between the UE and the one or more other UEs being below a threshold, and
if the interference condition is met, the first antenna elements corresponding to the UE and the second antenna elements corresponding to the one or more other UEs are merged in the cluster of multiple distributed antenna elements.

8. A base station (BS) comprising:
antenna elements distributed within a cell of the BS;
a processor configured to:
cluster multiple of the distributed antenna elements based on intercell interference mitigation to include (i) first antenna elements based on a path loss to a user equipment (UE) and (ii) second antenna elements corresponding to one or more other UEs that meet an interference condition, wherein clustering of the cluster of multiple distributed antenna elements and the inter cell interference mitigation are based on antenna sharing radius that is larger than a radius of the cell; and
generate information indicating channel state information-reference signal (CSI-RS) resources each of which comprises a set of antenna ports, wherein the set of antenna ports is configured based on the cluster of multiple distributed antenna elements; and
a transceiver operably connected to the processor, the transceiver configured to transmit, to the UE, the information via a dynamic signaling comprising at least one of a medium access control channel element (MAC CE) or downlink control information (DCI) that indicates the CSI-RS resources, wherein an aggregation of the CSI-RS resources is performed; and
wherein energy per resource element (EPRE) ratio between the CSI-RS resources and an associated physical downlink shared channel (PDSCH), respectively, is configured in the transmitted information indicating the CSI-RS resources.

9. The BS of claim 8 , wherein the transceiver is further configured to transmit the information via a radio resource control (RRC) signaling.

10. The BS of claim 8 , wherein:
the processor is further configured to determine a dedicated physical random access channel (PRACH); and
the transceiver is further configured to:
receive, from the UE, an uplink signaling through the PRACH; and
transmit, to the UE, a random access response (RAR) including a set of CSI-RS antenna ports that is used by the UE to measure CSI acquisition.

11. The BS of claim 8 , wherein:
the transceiver is further configured to receive a dedicated physical random access channel (PRACH) preamble that is received at more than one antenna port; and
the processor is further configured to determine the set of antenna ports to be associated with the UE.

12. The BS of claim 8 , wherein:
the processor is further configured to identify the cluster of multiple distributed antenna elements that is dynamically allocated at a same time, by the BS, to a plurality of UEs including the UE and the one or more other UEs, and
at least one of the distributed antenna elements in the cluster is shared by a different UE in another cell.

13. The BS of claim 8 , wherein EPRE ratio information per each of the CSI-RS resources is indicated in at least one of an aperiodic CSI-RS triggering or an aperiodic CSI report triggering.

14. The BS of claim 8 , wherein the EPRE ratio configured to each of the CSI-RS resources is selected from a set of variable values via an RRC signaling.

15. A method for a user equipment (UE), the method comprising:
receiving, from a base station (BS) in a cell comprising antenna elements distributed within the cell, information via a dynamic signaling comprising at least one of a medium access control channel element (MAC CE) or downlink control information (DCI) that indicates a set of channel state information-reference signal (CSI-RS) resources;
identifying CSI-RS resources each of which comprises a set of antenna ports based on the received information, wherein the set of antenna ports is configured based on a cluster of multiple of the distributed antenna elements, the multiple distributed antenna elements clustered based on intercell interference mitigation, wherein the cluster of distributed antenna elements includes (i) first antenna elements clustered based on a path loss to the UE and (ii) second antenna elements corresponding to one or more other UEs that meet an interference condition; and
measuring CSI using an aggregation of the CSI-RS resources, wherein an energy per resource element (EPRE) ratio between the CSI-RS resources and an associated physical downlink shared channel (PDSCH), res

Assignees

• Samsung Electronics Co Ltd

Inventors

• Hu Yeqing
• Ng Boon Loong
• Nam Young-Han
• Yuan Jin
• Xu Gary
• Seol Ji-Yun
• Zhang Jianzhong

Classifications

• Y02D30/70

  in wireless communication networks · CPC title

• H04W74/0838

  using contention-free random access [CFRA] · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title