US-12628009-B2 - Techniques for measuring synchronization signal blocks in wireless communications

US12628009B2US 12628009 B2US12628009 B2US 12628009B2US-12628009-B2

Abstract

Aspects described herein relate to receiving multiple synchronization signal blocks (SSBs) from a target cell over a measurement time window. A repeating beam index for one or more of the multiple SSBs can be identified based at least in part on a determination of a repeat parameter indicating a number of beams in a SSB pattern for the target cell. A beam set of the one or more of the multiple SSBs determined to have the same repeating beam index can be associated. One or more parameters of the one or more of the multiple SSBs of the beam set can be measured and reported.

Inventors

Pravjyot Singh DEOGUN
Ozcan Ozturk
Jing Sun
Xiaoxia Zhang
Kapil Bhattad
Ananta Narayanan Thyagarajan

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260512
Application Date: 20200316
Priority Date: 20190328

Claims (20)

1 . A method for wireless communication, comprising: receiving multiple synchronization signal blocks (SSBs) in multiple SSB bursts from a cell over respective measurement time windows; identifying, for each SSB in a subset of the multiple SSBs, a repeating beam index, wherein the identifying, for each SSB, the repeating beam index is based at least in part on an index of a demodulation reference signal (DM-RS) sequence associated with the respective SSB and a repeat parameter indicating a number of beams in a SSB pattern for the cell; and associating two or more SSBs of the subset of the multiple SSBs, each received in a different SSB burst of the multiple SSB bursts over the respective measurement time windows and having the same repeating beam index, as having a same measurement value.
2 . The method of claim 1 , further comprising receiving, from a serving cell, an indication of the repeat parameter.
3 . The method of claim 2 , wherein the indication of the repeat parameter applies to at least one of cells associated with a frequency.
4 . The method of claim 2 , wherein the indication of the repeat parameter applies to one or more lists of cells within or across a frequency.
5 . The method of claim 1 , further comprising reporting, to a serving cell, the repeat parameter received from a broadcast channel of the cell based on serving cell configuration.
6 . The method of claim 1 , further comprising reporting, to a serving cell, one or more target cells from which SSBs are received and for which an associated repeat parameter is not determined.
7 . The method of claim 1 , further comprising determining the two or more SSBs to have a threshold signal strength, and decoding, based on the two or more SSBs having the threshold signal strength, a broadcast channel of the cell to determine the repeat parameter.
8 . The method of claim 1 , further comprising reporting the same measurement value at least in part by filtering measurements of the two or more SSBs having a signal strength that achieves a threshold.
9 . The method of claim 8 , wherein the reporting the same measurement value comprises determining at least one of an average value of one or more parameters of the two or more SSBs, a maximum value of the one or more parameters of the two or more SSBs, a random selection of a value of the one or more parameters of the two or more SSBs, or all values of the one or more parameters of the two or more SSBs.
10 . The method of claim 1 , further comprising receiving, from a serving cell, at least one of an indication to measure outside the respective measurement time windows associated with a frequency, an indication of an additional respective measurement time window or a listing of cells, including the cell, to measure within the additional respective measurement time window.
11 . The method of claim 10 , further comprising receiving, from the serving cell, a gap periodicity or offset for starting measuring, or an activation or deactivation command to start or stop measuring in the gap duration.
12 . The method of claim 1 , further comprising reporting, to a serving cell and based on the associating the two or more SSBs, a measurement of one or more parameters of at least one SSB of the two or more SSBs.
13 . The method of claim 1 , wherein the associating the two or more SSBs is based on receiving an indication of quasi-colocation between the two or more SSBs.
14 . An apparatus for wireless communication, comprising: a transceiver; a memory configured to store instructions; and one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to: receive multiple synchronization signal blocks (SSBs) in multiple SSB bursts from a cell over respective measurement time windows; identify, for each SSB in a subset of the multiple SSBs, a repeating beam index based at least in part on an index of a demodulation reference signal (DM-RS) sequence associated with the respective SSB and a repeat parameter indicating a number of beams in a SSB pattern for the cell; and associate, in the memory, two or more SSBs of the subset of the multiple SSBs, each received in a different SSB burst of the multiple SSB bursts over the respective measurement time windows and having the same repeating beam index as having a same measurement value.
15 . The apparatus of claim 14 , wherein the one or more processors are further configured to receive, from a serving cell, an indication of the repeat parameter.
16 . The apparatus of claim 15 , wherein the indication of the repeat parameter applies to at least one of cells associated with a frequency.
17 . The apparatus of claim 15 , wherein the indication of the repeat parameter applies to one or more lists of cells within or across a frequency.
18 . The apparatus of claim 14 , wherein the one or more processors are further configured to report, to a serving cell, the repeat parameter received from a broadcast channel of the cell based on serving cell configuration.
19 . The apparatus of claim 14 , wherein the one or more processors are further configured to report, to a serving cell, one or more target cells from which SSBs are received, by the transceiver, and for which an associated repeat parameter is not determined.
20 . The apparatus of claim 14 , wherein the one or more processors are further configured to determine the two or more SSBs to have a threshold signal strength, and wherein the one or more processors are configured to determine the repeat parameter at least in part by decoding, based on the two or more SSBs having the threshold signal strength, a broadcast channel of the cell.

Description

CLAIM OF PRIORITY UNDER 35 U.S.C. § 199 The present Application for Patent claims priority to Indian Patent Application No. 201941012234, entitled “TECHNIQUES FOR MEASURING SYNCHRONIZATION SIGNAL BLOCKS IN WIRELESS COMMUNICATIONS” filed Mar. 28, 2019, and Indian Patent Application No. 201941015042, entitled “TECHNIQUES FOR MEASURING SYNCHRONIZATION SIGNAL BLOCKS IN WIRELESS COMMUNICATIONS” filed Apr. 15, 2019, which are assigned to the assignee hereof and hereby expressly incorporated by reference herein for all purposes. BACKGROUND Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to communications related to synchronization signal blocks (SSBs). Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include code-division multiple access (CDMA) systems, time-division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, and orthogonal frequency-division multiple access (OFDMA) systems, and single-carrier frequency division multiple access (SC-FDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. For example, a fifth generation (5G) wireless communications technology (which can be referred to as 5G new radio (5G NR)) is envisaged to expand and support diverse usage scenarios and applications with respect to current mobile network generations. In an aspect, 5G communications technology can include: enhanced mobile broadband addressing human-centric use cases for access to multimedia content, services and data; ultra-reliable-low latency communications (URLLC) with certain specifications for latency and reliability; and massive machine type communications, which can allow a very large number of connected devices and transmission of a relatively low volume of non-delay-sensitive information. In some wireless communication technologies, base stations can transmit SSBs to allow devices, such as user equipment (UEs) to determine timing synchronization to the base station and establish communications therewith. UEs can additionally report measurements of the SSBs to a serving cell for determining a target cell for handover. In wireless communication technologies that use a listen-before-talk (LBT) mechanism, the SSBs may be transmitted asynchronously and/or in bursts. Without decoding broadcast information, it may be difficult for the UE to determine certain information about the SSBs for reporting to the serving cell. SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. According to an example, a method of wireless communication is provided. The method includes receiving multiple synchronization signal blocks (SSBs) from a target cell over a measurement time window, identifying a repeating beam index for one or more of the multiple SSBs, wherein identifying the repeating beam index is based at least in part on a determination of a repeat parameter indicating a number of beams in a SSB pattern for the target cell, associating a beam set of the one or more of the multiple SSBs determined to have the same repeating beam index, measuring one or more parameters of the one or more of the multiple SSBs of the beam set, and reporting, to a serving cell, a measurement of the one or more parameters of beam set for the target cell. In another example, a method for wireless communications is provided. The method includes receiving, from a user equipment (UE) at a serving cell, a reporting of a measurement of one or more parameters of a beam set of a target cell, and processing, by the serving cell, the measurement for determining whether to handover the UE to the target cell based at least in part on whether a repeat parameter, for determining a repeating beam index, is determinable by the UE. In another example, a method for wireless communication is provided. The method includes configuring a number of SSBs for transmitting based on different beams, determining that the number of SSBs is not a factor of a configured value, and transmitting one or more of the number of SSBs as one or more ad