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

• US 9,258,718 B2
• Filed: 02/21/2012
• Issued: 02/09/2016
• Est. Priority Date: 02/22/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ji, Tingfang, Palanki, Ravi, Gaal, Peter, Xu, Hao, Wei, Yongbin
• Primary Examiner(s): Chu, Wutchung
• Application Number:
  US13/401,696
• Publication Number:
  US 20130051317A1
• Time in Patent Office: 1,449 Days
• Field of Search: 4554561-4565, 455/456.6
• US Class Current: 1/1
• CPC Class Codes: G01S 1/20 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 Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/085 Access point devices with remote components

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.

Claims

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.