Discovery signals and network synchronization signals design in LTE

• US 10,448,236 B2
• Filed: 06/26/2017
• Issued: 10/15/2019
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Chen, Wanshi, Gaal, Peter, Damnjanovic, Aleksandar, Wang, Michael Mao
• Primary Examiner(s): Moutaouakil, Mounir
• Application Number:
  US15/633,610
• Publication Number:
  US 20170311144A1
• Time in Patent Office: 841 Days
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Base stations (such as small cells) may support active and dormant states. To facilitate state transitions, these cells may transmit discovery signals. The transmission design of both discovery signals and network synchronization signals from small cells should provide for regular periodicity, while supporting the benefit of transitioning between active and dormant states. Disclosed is a method, a computer program product, and an apparatus that determine a first reference signal for at least one of discovery or measurement, and a second reference signal for synchronization, where both the first reference signal and the second reference signal are based on a same type of reference signal.

Claims

1. A method of wireless communication for a user equipment (UE) comprising:

receiving, from a base station (BS), a first reference signal for at least one of discovery or measurement and a second reference signal for synchronization, the first reference signal or the second reference signal being based on a Positioning Reference Signal (PRS) having a bandwidth configured by, the BS to be less than a downlink system bandwidth of the BS, wherein the other of the first reference signal or the second reference signal is based on a Cell-Specific Reference Signal (CRS); and

detecting at least one BS based on at least one of the first or second reference signals, wherein the detecting by the UE is based on transmission of the first reference signal and second reference signal with a same energy per resource element (EPRE).

2. The method of claim 1, further comprising:

receiving one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising the configured bandwidth.

3. The method of claim 1, further comprising:

receiving one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising information identifying a subframe that includes at least one of the first reference signal or the second reference signal.

4. The method of claim 1, further comprising:

receiving one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising a stratum level.

5. The method of claim 1, further comprising:

receiving one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising an EPRE of at least one of the first reference signal or the second reference signal.

6. An apparatus for wireless communication for a user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive, from a base station (BS), a first reference signal for at least one of discovery or measurement and a second reference signal for synchronization, the first reference signal or the second reference signal being based on a Positioning Reference Signal (PRS) having a bandwidth configured by the BS to be less than a downlink system bandwidth of the BS, wherein the other of the first reference signal or the second reference signal is based on a Cell-Specific Reference Signal (CRS);

detect at least one BS based on at least one of the first or second reference signals, wherein the of detects the at least one BS based on transmission of the first reference signal and second reference signal with a same energy per resource element (EPRE).

7. The apparatus of claim 6, wherein the at least one processor is further configured to:

receive one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising at least one of;

the configured bandwidth,

information identifying a subframe that includes at least one of the first reference signal or the second reference signal,

a stratum level, or

an EPRE of at least one of the first reference signal or the second reference signal.

8. An apparatus for wireless communication at a user equipment (UE), comprising:

means for receiving, from a base station (BS), a first reference signal for at least one of discovery or measurement and a second reference signal for synchronization, the first reference signal or the second reference signal being based on a Positioning Reference Signal (PRS) having a bandwidth configured by the BS to be less than a downlink system bandwidth of the BS, wherein the other of the first reference signal or the second reference signal is based on a Cell-Specific Reference Signal (CRS); and

means for detecting at least one BS based on at least one of the first or second reference signals, wherein the detecting by the UE is based on transmission of the first reference signal and second reference signal with a same energy per resource element (EPRE).

9. The apparatus of claim 8, further wherein the means for receiving receive one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising at least one of:

the configured bandwidth,

information identifying a subframe that includes at least one of the first reference signal or the second reference signal,

a stratum level, or

an EPRE of at least one of the first reference signal or the second reference signal.

10. A non-transitory computer-readable medium storing computer executable code wireless communication for a user equipment (UE), comprising code to:

receive, from a base station (BS), a first reference signal for at least one of discovery or measurement and a second reference signal for synchronization, the first reference signal or the second reference signal being based on a Position Reference Signal (PRS) having a bandwidth configured by the BS to be less than a downlink system bandwidth of the BS, wherein the other of the first reference signal or the second reference signal is based on a Cell-Specific Reference Signal (CRS); and

detect at least one BS based on at least one of the first or second reference signals, wherein the UE detects the at least one BS based on transmission of the first reference signal and second reference signal with a same energy per resource element (EPRE).

11. The computer-readable medium of claim 10, further comprising code to:

receive one or more parameters associated with at least one of the first reference signal or the second reference signal from the BS, the one or more parameters comprising at least one of;

the configured bandwidth,

information identifying a subframe that includes at least one of the first reference signal or the second reference signal,

a stratum level, or

an EPRE of at least one of the first reference signal or the second reference signal.