Positioning location for remote radio heads (RRH) with same physical cell identity (PCI)

Patent metadata

Field	Value
Publication number	US-9258718-B2
Application number	US-201213401696-A
Country	US
Kind code	B2
Filing date	Feb 21, 2012
Priority date	Feb 22, 2011
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A method of wireless communication includes configuring a plurality of remote radio heads (RRHs) to prevent position location reference signal (PRS) transmissions on the same subframes where the macro eNodeB transmits PRS. The configured RRHs each have a same physical cell identity (PCI) as the macro eNodeB. The RRHs communicating in accordance with the configuration.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
configuring, a plurality of remote radio heads (RRHs), each RRH having a same physical cell identity (PCI) as a macro eNodeB, to prevent position location reference signal (PRS) transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of each RRH to be at a time that is different from a PRS transmission time of other RRHs of the plurality of RRHs and a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
communicating in accordance with the configuration.

2. A method of wireless communication, comprising:
receiving, at a location server from a remote radio head (RRH) and a macro eNodeB, reference signal time difference (RSTD) measurements determined from an uplink transmission from a user equipment (UE);
combining, at the location server, the received RSTD measurements with measurements from the UE that are based at least in part on RSTD measurements of a first position reference signal (PRS) from the macro eNodeB and a second PRS from the RRH, which has a same physical cell identity (PCI) as the macro eNodeB, the RRH configured to prevent PRS transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of the RRH to be at a time that is different from a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
determining, at the location server, a position location of the UE based on a combination of the received RSTD measurements from the RRH, the received RSTD measurements and the measurements from the UE.

3. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory, the at least one processor being configured:
to configure, a plurality of remote radio heads (RRHs), each RRH having a same physical cell identity (PCI) as a macro eNodeB, to prevent position location reference signal (PRS) transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of each RRH to be at a time that is different from a PRS transmission time of other RRHs of the plurality of RRHs and a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
to communicate in accordance with the configuration.

4. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory, the at least one processor being configured:
to receive, at a location server from a remote radio head (RRH) and a macro eNodeB, reference signal time difference (RSTD) measurements determined from an uplink transmission from a user equipment (UE);
to combine, at the location server, the received RSTD measurements with measurements from the UE that are based at least in part on RSTD measurements of a first position reference signal (PRS) from the macro eNodeB and a second PRS from the RRH, which has a same physical cell identity (PCI) as the macro eNodeB, the RRH configured to prevent PRS transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of the RRH to be at a time that is different from a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
to determine, at the location server, a position location of the UE based on a combination of the received RSTD measurements from the RRH, the received RSTD measurements and the measurements from the UE.

5. A computer program product for wireless communication in a wireless network, comprising:
a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:
program code to configure, a plurality of remote radio heads (RRHs), each RRH having a same physical cell identity (PCI) as a macro eNodeB, to prevent position location reference signal (PRS) transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of each RRH to be at a time that is different from a PRS transmission time of other RRHs of the plurality of RRHs and a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
program code to communicate in accordance with the configuration.

6. A computer program product for wireless communication in a wireless network, comprising:
a non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:
program code to receive, at a location server from a remote radio head (RRH) and a macro eNodeB, reference signal time difference (RSTD) measurements determined from an uplink transmission from a user equipment (UE);
program code to combine, at the location server, the received RSTD measurements with measurements from the UE that are based at least in part on RSTD measurements of a first position reference signal (PRS) from the macro eNodeB and a second PRS from the RRH, which has a same physical cell identity (PCI) as the macro eNodeB, the RRH configured to prevent PRS transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of the RRH to be at a time that is different from a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
program code to determine, at the location server, a position location of the UE based on a combination of the received RSTD measurements from the RRH, the received RSTD measurements and the measurements from the UE.

7. An apparatus for wireless communication, comprising:
means for configuring, a plurality of remote radio heads (RRHs), each RRH having a same physical cell identity (PCI) as a macro eNodeB, to prevent position location reference signal (PRS) transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of each RRH to be at a time that is different from a PRS transmission time of other RRHs of the plurality of RRHs and a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
means for communicating in accordance with the configuration.

8. An apparatus for wireless communication, comprising:
means for receiving, at a location server from a remote radio head (RRH) and a macro eNodeB, reference signal time difference (RSTD) measurements determined from an uplink transmission from a user equipment (UE);
means for combining, at the location server, the received RSTD measurements with measurements from the UE that are based at least in part on RSTD measurements of a first position reference signal (PRS) from the macro eNodeB and a second PRS from the RRH, which has a same physical cell identity (PCI) as the macro eNodeB, the RRH configured to prevent PRS transmissions on subframes where the macro eNodeB transmits PRS by scheduling a PRS transmission time of the RRH to be at a time that is different from a PRS transmission time of the macro eNodeB, and each RRH and macro eNodeB transmitting a same PRS that does not indicate a source of transmission; and
means determining, at the location server, a position location of the UE based on a combination of the received RSTD measurements from the RRH, the received RSTD measurements and the measurements from the UE.

Assignees

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

• H04W24/02 Primary

  Arrangements for optimising operational condition · CPC title

• G01S1/20

  using a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems · CPC title

• H04W64/00 Primary

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