Enhanced synchronization signals for coverage enhancements of low cost user equipment

• US 10,542,505 B2
• Filed: 03/21/2018
• Issued: 01/21/2020
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Si, Hongbo, Lin, Qiongjie, Liu, Le, Papasakellariou, Aris
• Primary Examiner(s): Phan, Man U
• Application Number:
  US15/927,800
• Publication Number:
  US 20180279239A1
• Time in Patent Office: 671 Days
• Field of Search: 370350
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for a user equipment (UE) in a wireless communication system is provided. The method comprises receiving, from a base station (BS), re-synchronization signals (RSSs) over a downlink channel; identifying time-domain and frequency-domain resources used for the RSSs; and identifying a set of sequences used for constructing the RSSs from the time-domain and frequency-domain resources used for the RSSs.

Claims

1. A user equipment (UE) in a wireless communication system, the UE comprising:

a transceiver configured to receive, from a base station (BS), a re-synchronization signal (RSS) over a downlink channel; and

a processor operably connected to the transceiver, the processor configured to;

identify time-domain and frequency-domain resources used for the RSS; and

identify a sequence used for constructing the RSS from the time-domain and frequency-domain resources used for the RSS,

wherein the sequence used for constructing the RSS is a quadrature phase shift keying (QPSK) modulated pseudo-noise (PN) sequence scrambled by a cover code and with an initial condition including at least part of a physical cell identification (ID).

2. The UE of claim 1, wherein the time-domain resources are a set of consecutive subframes periodically received from the BS.

3. The UE of claim 2, wherein:

a periodicity of the set of consecutive subframes is configured by the BS; and

indices the set of consecutive subframes are configured by the BS.

4. The UE of claim 2, wherein the cover code is determined for each subframe in the set of consecutive subframes.

5. The UE of claim 1, wherein the frequency-domain resources are configured by the BS.

6. The UE of claim 4, wherein the sequence used for constructing the RSS is mapped to the identified time-domain and frequency-domain resources in a frequency-first and time-second order.

7. The UE of claim 4, wherein the sequence used for constructing the RSS includes an indication of a system information update.

8. A base station (BS) in a wireless communication system, the BS comprising:

a processor configured to;

configure time-domain and frequency-domain resources used for a re-synchronization signal (RSS);

generate a sequence to construct the RSS; and

map the generated sequence to the time-domain and frequency-domain resources to be used for the RSS; and

a transceiver operably connected to the processor, the transceiver configured to transmit, to a user equipment (UE), the RSS over a downlink channel,

wherein the sequence used for constructing the RSS is a quadrature phase shift keying (QPSK) modulated pseudo-noise (PN) sequence scrambled by a cover code and with an initial condition including at least part of a physical cell identification (ID).

9. The BS of claim 8, wherein the time-domain resources are a set of consecutive subframes periodically received from the BS.

10. The BS of claim 9, wherein:

a periodicity of the set of consecutive subframes is configured by the BS; and

indices the set of consecutive subframes are configured by the BS.

11. The BS of claim 9, wherein the cover code is determined for each subframe in the set of consecutive subframes.

12. The BS of claim 8, wherein the frequency-domain resources are configured by the BS.

13. The BS of claim 8, wherein the sequence used for constructing the RSS is mapped to the time-domain and frequency-domain resources in a frequency-first and time-second order.

14. The BS of claim 8, wherein the sequence used for constructing the RSS includes an indication of a system information update.

15. A method for a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station (BS), a re-synchronization signal (RSS) over a downlink channel;

identifying time-domain and frequency-domain resources used for the RSS; and

identifying a sequence used for constructing the RSS from the time-domain and frequency-domain resources used for the RSS,

wherein the sequence used for constructing the RSS is a quadrature phase shift keying (QPSK) modulated pseudo-noise (PN) sequence scrambled by a cover code and with an initial condition including at least part of a physical cell identification (ID).

16. The method of claim 15, wherein the time-domain resources are a set of consecutive subframes periodically received from the BS.

17. The method of claim 16, wherein:

a periodicity of the set of consecutive subframes is configured by the BS; and

indices the set of consecutive subframes are configured by the BS.

18. The method of claim 16, wherein the cover code is determined for each subframe in the set of consecutive subframes.

19. The method of claim 15, wherein the frequency-domain resources are configured by the BS.

20. The method of claim 15, wherein the sequence used for constructing the RSS is mapped to the identified time-domain and frequency-domain resources in a frequency-first and time-second order.