MULTI-SUBFRAME DISCOVERY REFERENCE SIGNALING (DRS) MEASUREMENT TIMING CONFIGURATION (DMTC) WINDOW

• US 20180227797A1
• Filed: 02/01/2018
• Published: 08/09/2018
• Est. Priority Date: 02/03/2017
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: LIU, Chih-Hao, YERRAMALLI, Srinivas, CHENDAMARAI KANNAN, Arumugam, KADOUS, Tamer Adel, SADEK, Ahmed Kamel
• Granted Patent: US 11,310,695 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

In an embodiment, an access point executes a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window. The access point transmits, based on a result of the execution, a multi-subframe DRS within the DMTC window, the multi-subframe DRS including a plurality of DRS subframes that each includes a plurality of symbols.

Claims

1. A method of configuring a Discovery Reference Signaling (DRS) on a shared communication medium, comprising:

executing a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and

transmitting, based on a result of the executing, a multi-subframe DRS within the DMTC window, the multi-subframe DRS including a plurality of DRS subframes that each includes a plurality of symbols.

2. The method of claim 1, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, a set of extended Secondary Synchronization Signal (eSSS) repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.

3. The method of claim 2, wherein the plurality of DRS subframes includes:

a first DRS subframe that is configured as an extended version of a legacy DRS,

a second DRS subframe including the set of ePSS repetitions in a corresponding set of resource blocks of the second DRS subframe,

a third DRS subframe including the set of eSSS repetitions in a corresponding set of resource blocks of the third DRS subframe, and

a fourth DRS subframe including the set of ePBCH repetitions in a corresponding set of resource blocks of the fourth DRS subframe.

4. The method of claim 2, wherein each ePBCH among the set of ePBCH repetitions includes an ePBCH payload that is configured to convey a System Frame Number (SFN) timing for a respective DRS subframe containing the ePBCH.

5. The method of claim 4,

wherein the DMTC window is 160 ms,

wherein each SFN includes 10 bits, and)

wherein each ePBCH payload includes (10−

log₂ min(T_DMTC)/10) most significant bits (MSB) with 6 bits being carried for indicating the SFN timing.

6. The method of claim 2, wherein each ePBCH among the set of ePBCH repetitions includes subframe or frame offset indices.

7. The method of claim 2, wherein each eSSS specifies whether a starting position of a given DRS subframe that contains the eSSS within the multi-subframe DRS is in a first five subframes of the DMTC window or in a last five subframes of the DMTC window.

8. The method of claim 7,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the first five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the first five subframes of the DMTC window.

9. The method of claim 8, wherein a subframe following the given DRS subframe uses a fixed scrambling.

10. The method of claim 9, wherein the fixed scrambling is a function of (i) a subframe position number of the first of the first five subframes of the given DRS subframe within the DMTC window, or (ii) a subframe position number of a second of the first five subframes of the given DRS subframe within the DMTC.

11. The method of claim 7,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the last five subframes of the DMTC window.

12. The method of claim 11, wherein a subframe following the given DRS subframe uses a fixed scrambling.

13. The method of claim 9, wherein the fixed scrambling is a function of (i) a subframe position number of the first of the last five subframes of the given DRS subframe within the DMTC window, or (ii) a subframe position number of a second of the last five subframes of the given DRS subframe within the DMTC.

14. The method of claim 1, wherein the CCA protocol is Listen Before Talk (LBT) Category 4.

15. An access point apparatus configured to transmit a Discovery Reference Signaling (DRS) on a shared communication medium, comprising:

means for executing a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and

means for transmitting, based on a results of the execution, a multi-subframe DRS within the DMTC window, the multi-subframe DRS including a plurality of DRS subframes that each includes a plurality of symbols.

16. The access point apparatus of claim 15, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, a set of extended Secondary Synchronization Signal (eSSS) repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.

17. The access point apparatus of claim 16, wherein each eSSS specifies whether a starting position of a given DRS subframe that contains the eSSS within the multi-subframe DRS is in a first five subframes of the DMTC window or in a last five subframes of the DMTC window.

18. The access point apparatus of claim 17,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the first five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the first five subframes of the DMTC window.

19. The access point apparatus of claim 18, wherein a subframe following the given DRS subframe uses a fixed scrambling.

20. The access point apparatus of claim 17,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the last five subframes of the DMTC window.

21. The access point apparatus of claim 20, wherein a subframe following the given DRS subframe uses a fixed scrambling.

22. An access point apparatus configured to transmit a Discovery Reference Signaling (DRS) on a shared communication medium, comprising:

at least one processor coupled to at least one transceiver and configured to cause the access point apparatus to;

execute a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and

transmit, based on a result of the execution, a multi-subframe DRS within the DMTC window, the multi-subframe DRS including a plurality of DRS subframes that each includes a plurality of symbols.

23. The access point apparatus of claim 22, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, a set of extended Secondary Synchronization Signal (eSSS) repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.

24. The access point apparatus of claim 23, wherein each eSSS specifies whether a starting position of a given DRS subframe that contains the eSSS within the multi-subframe DRS is in a first five subframes of the DMTC window or in a last five subframes of the DMTC window.

25. The access point apparatus of claim 24,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the first five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the first five subframes of the DMTC window.

26. The access point apparatus of claim 25, wherein a subframe following the given DRS subframe uses a fixed scrambling.

27. The access point apparatus of claim 24,

wherein the given DRS subframe uses a scrambling that is a function of a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window based on the starting position of the given DRS subframe being in the last five subframes of the DMTC window.

28. The access point apparatus of 27, wherein a subframe following the given DRS subframe uses a fixed scrambling.

29. A non-transitory computer-readable medium containing instructions stored thereon, which, when executed by an access point apparatus configured to transmit a Discovery Reference Signaling (DRS) on a shared communication medium, cause the access point apparatus to perform operations, the instructions comprising:

at least one instruction configured to cause the access point apparatus to execute a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and

at least one instruction configured to cause the access point apparatus to transmit, based on a result of the execution, a multi-subframe DRS within the DMTC window, the multi-subframe DRS including a plurality of DRS subframes that each includes a plurality of symbols.

30. The non-transitory computer-readable medium of claim 29, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, a set of extended Secondary Synchronization Signal (eSSS) repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.