# US 11,310,695 B2 · Multi-subframe discovery reference signaling (DRS) measurement timing configuration (DMTC) window

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- Number: US 11,310,695 B2
- Document ID: US11310695B2
- Status: Granted
- Kind: B2
- Application number: 15/886,400
- Filed: 2018-02-01
- Published: 2018-08-09
- Granted: 2022-04-19
- Earliest claimed: 2017-02-03
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Chih-Hao Liu; Srinivas Yerramalli; Arumugam Chendamarai Kannan; Tamer Kadous; Ahmed Kamel Sadek
- Web page: https://patentgrep.com/patent/US11310695B2

## CPC

- 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)}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 74/0816: with collision avoidance
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## 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

### Claim 1

A method of configuring a Discovery Reference Signaling (DRS) on a shared communication medium, comprising:
executing, by an access point (AP), a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and
transmitting, by the AP 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,
wherein a first scrambling is defined for a first set of subframes of the DMTC window and a second scrambling is defined for a second set of subframes of the DMTC window, and
wherein the transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the first scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window, or wherein the transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the second scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window,
wherein a given DRS subframe of the plurality of DRS subframes includes a set of extended Secondary Synchronization Signal (eSSS) repetitions,
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, and
wherein the fixed scrambling is a function of:
(i) a subframe position number of a first of the first five subframes 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 window, or
(iii) a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window, or
(iv) a subframe position number of a second of the last five subframes of the given DRS subframe within the DMTC window.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 2)

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.

### Claim 5 (depends on 4)

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
-
log
2
⁢
min
⁡
(
T
DMTC
)
10
)
most significant bits (MSB) with 6 bits being carried for indicating the SFN timing.

### Claim 6 (depends on 2)

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

### Claim 7 (depends on 1)

The method of claim 1,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 8 (depends on 7)

The method of claim 7, wherein a subframe following the given DRS subframe uses the fixed scrambling.

### Claim 9 (depends on 1)

The method of claim 1, wherein the fixed scrambling is a function of (i) the subframe position number of the first of the first five subframes of the given DRS subframe within the DMTC window.

### Claim 10 (depends on 1)

The method of claim 1,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 11 (depends on 10)

The method of claim 10, wherein a subframe following the given DRS subframe uses the fixed scrambling.

### Claim 12 (depends on 1)

The method of claim 1, wherein the fixed scrambling is a function of (iii) the subframe position number of the first of the last five subframes of the given DRS subframe within the DMTC window.

### Claim 13 (depends on 1)

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

### Claim 14

An access point apparatus configured to transmit a Discovery Reference Signaling (DRS) on a shared communication medium, comprising:
means for executing, by the access point apparatus, a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and
means for transmitting, by the access point apparatus 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,
wherein a first scrambling is defined for a first set of subframes of the DMTC window and a second scrambling is defined for a second set of subframes of the DMTC window, and
wherein the means for transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the first scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window, or wherein the transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the second scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window,
wherein a given DRS subframe of the plurality of DRS subframes includes a set of extended Secondary Synchronization Signal (eSSS) repetitions,
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, and
wherein the fixed scrambling is a function of:
(i) a subframe position number of a first of the first five subframes 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 window, or
(iii) a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window, or
(iv) a subframe position number of a second of the last five subframes of the given DRS subframe within the DMTC window.

### Claim 15 (depends on 14)

The access point apparatus of claim 14, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, the set of eSSS repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.

### Claim 16 (depends on 14)

The access point apparatus of claim 14,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 17 (depends on 16)

The access point apparatus of claim 16, wherein a subframe following the given DRS subframe uses the fixed scrambling.

### Claim 18 (depends on 14)

The access point apparatus of claim 14,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 19 (depends on 18)

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

### Claim 20

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, by the access point apparatus, a Clear Channel Assessment (CCA) protocol to determine whether to begin transmission within a DRS Measurement Timing Configuration (DMTC) window; and
transmit, by the access point apparatus 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,
wherein a first scrambling is defined for a first set of subframes of the DMTC window and a second scrambling is defined for a second set of subframes of the DMTC window, and
wherein the at least one processor is configured to scramble the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the first scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window, or wherein the transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the second scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window,
wherein a given DRS subframe of the plurality of DRS subframes includes a set of extended Secondary Synchronization Signal (eSSS) repetitions,
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, and
wherein the fixed scrambling is a function of:
(i) a subframe position number of a first of the first five subframes 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 window, or
(iii) a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window, or
(iv) a subframe position number of a second of the last five subframes of the given DRS subframe within the DMTC window.

### Claim 21 (depends on 20)

The access point apparatus of claim 20, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, the set of eSSS repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.

### Claim 22 (depends on 20)

The access point apparatus of claim 20,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 23 (depends on 22)

The access point apparatus of claim 22, wherein a subframe following the given DRS subframe uses the fixed scrambling.

### Claim 24 (depends on 20)

The access point apparatus of claim 20,
wherein the given DRS subframe uses a scrambling that is a function of the subframe position number of the 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.

### Claim 25

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

### Claim 26

A non-transitory computer-readable storage 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,
wherein a first scrambling is defined for a first set of subframes of the DMTC window and a second scrambling is defined for a second set of subframes of the DMTC window, and
wherein the at least one instruction configured to cause the access point apparatus to transmit is further configured to cause the access point to scramble the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the first scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window, or wherein the transmitting scrambles the plurality of DRS subframes of the multi-subframe DRS in accordance with a fixed scrambling corresponding to the second scrambling irrespective of whether the plurality of DRS subframes are split between the first and second sets of subframes of the DMTC window,
wherein a given DRS subframe of the plurality of DRS subframes includes a set of extended Secondary Synchronization Signal (eSSS) repetitions,
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, and
wherein the fixed scrambling is a function of:
(i) a subframe position number of a first of the first five subframes 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 window, or
(iii) a subframe position number of a first of the last five subframes of the given DRS subframe within the DMTC window, or
(iv) a subframe position number of a second of the last five subframes of the given DRS subframe within the DMTC window.

### Claim 27 (depends on 26)

The non-transitory computer-readable storage medium of claim 26, wherein the plurality of DRS subframes includes a set of extended Primary Synchronization Signal (ePSS) repetitions, the set of eSSS repetitions, and a set of extended Physical Broadcast Channel (ePBCH) repetitions.