Positioning location for remote radio heads (rrh) with same physical cell identity (pci)

Patent metadata

Field	Value
Publication number	US-2016112983-A1
Application number	US-201514983152-A
Country	US
Kind code	A1
Filing date	Dec 29, 2015
Priority date	Feb 22, 2011
Publication date	Apr 21, 2016
Grant date	—

Abstract

A method of wireless communication includes receiving position location reference signals (PRSs) from multiple remote radio heads (RRHs) and a macro eNodeB having a same physical cell identity (PCI). Each PRS is a same PRS. Additionally, the PRSs from the multiple RRHs are received on subframes that are different from subframes used by the macro eNodeB. Furthermore, each PRS does not indicate a source of transmission. The method also includes determining a time difference between the received PRSs.

First claim

What is claimed is:

1 . A method of wireless communication by a user equipment (UE), comprising:
receiving position location reference signals (PRSs) from a plurality of remote radio heads (RRHs) and a macro eNodeB, the plurality of RRHs and the macro eNodeB having a same physical cell identity (PCI), each PRS being a same PRS and not indicating a source of transmission, a first PRS from a first RRH having been transmitted at a time that is different from each other transmission time of other PRSs from other RRHs and also different from a transmission time of a second PRS from the macro eNodeB.

2 . The method of claim 1 , further comprising receiving a mapping function for determining which node transmitted each PRS based on the timing.

3 . The method of claim 1 , further comprising determining UE measurements based at least in part on reference signal time difference (RSTD) measurements from the first PRS and the second PRS.

4 . The method of claim 3 , further comprising transmitting the UE measurements to a position location server.

5 . The method of claim 1 , further comprising transmitting uplink signals that enable calculation of reference signal time difference (RSTD) measurements at the macro eNodeB and at least one RRH, the RSTDs being used for position location.

6 . An apparatus for wireless communication, the apparatus comprising:
means for receiving position location reference signals (PRSs) from a plurality of remote radio heads (RRHs) and a macro eNodeB, the plurality of RRHs and the macro eNodeB having a same physical cell identity (PCI), each PRS being a same PRS and not indicating a source of transmission, a first PRS from a first RRH having been transmitted at a time that is different from each other transmission time of other PRSs from other RRHs and also different from a transmission time of a second PRS from the macro eNodeB; and means for determining a position location.

7 . The apparatus of claim 6 , further comprising means for receiving a mapping function for determining which node transmitted each PRS based on the timing.

8 . The apparatus of claim 6 , further comprising means for determining UE measurements based at least in part on reference signal time difference (RSTD) measurements from the first PRS and the second PRS.

9 . The apparatus of claim 8 , further comprising means for transmitting the UE measurements to a position location server.

10 . The apparatus of claim 6 , further comprising means for transmitting uplink signals that enable calculation of reference signal time difference (RSTD) measurements at the macro eNodeB and at least one RRH, the RSTDs being used for the position location.

11 . An apparatus for wireless communication, the apparatus comprising:
a memory; and at least one processor coupled to the memory, the at least one processor being configured:
to receive position location reference signals (PRSs) from a plurality of remote radio heads (RRHs) and a macro eNodeB, the plurality of RRHs and the macro eNodeB having a same physical cell identity (PCI), each PRS being a same PRS and not indicating a source of transmission, a first PRS from a first RRH having been transmitted at a time that is different from each other transmission time of other PRSs from other RRHs and also different from a transmission time of a second PRS from the macro eNodeB.

12 . The apparatus of claim 11 , in which the at least one processor is further configured to receive a mapping function for determining which node transmitted each PRS based on the timing.

13 . The apparatus of claim 11 , in which the at least one processor is further configured to determine UE measurements based at least in part on reference signal time difference (RSTD) measurements from the first PRS and the second PRS.

14 . The apparatus of claim 13 , in which the at least one processor is further configured to transmit the UE measurements to a position location server.

15 . The apparatus of claim 11 , in which the at least one processor is further configured to transmit uplink signals that enable calculation of reference signal time difference (RSTD) measurements at the macro eNodeB and at least one RRH, the RSTDs being used for the position location.

16 . A non-transitory computer-readable medium having a program code recorded thereon for wireless communication, the program code comprising:
program code to receive position location reference signals (PRSs) from a plurality of remote radio heads (RRHs) and a macro eNodeB, the plurality of RRHs and the macro eNodeB having a same physical cell identity (PCI), each PRS being a same PRS and not indicating a source of transmission, a first PRS from a first RRH having been transmitted at a time that is different from each other transmission time of other PRSs from other RRHs and also different from a transmission time of a second PRS from the macro eNodeB.

17 . The non-transitory computer-readable medium of claim 16 , further comprising program code to receive a mapping function for determining which node transmitted each PRS based on the timing.

18 . The non-transitory computer-readable medium of claim 16 , further comprising program code to determine UE measurements based at least in part on reference signal time difference (RSTD) measurements from the first PRS and the second PRS.

19 . The non-transitory computer-readable medium of claim 18 , further comprising program code to transmit the UE measurements to a position location server.

20 . The non-transitory computer-readable medium of claim 16 , further comprising program code to transmit uplink signals that enable calculation of reference signal time difference (RSTD) measurements at the macro eNodeB and at least one RRH, the RSTDs being used for the position location.

Assignees

• Qualcomm Inc

Inventors

• Ji Tingfang
• Palanki Ravi
• Gaal Peter
• Xu Hao
• Wei Yongbin

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W88/085

  Access point devices with remote components · CPC title

• H04W64/00 Primary

  Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title