as) United States
`a2) Patent Application Publication 10) Pub. No.: US 2018/0115990 Al
`
`(43) Pub. Date: Apr. 26, 2018
`ABEDINIetal.
`
`US 20180115990A1
`
`(54)
`
`(71)
`
`(72)
`
`DIRECTIONAL SYNCHRONIZATION IN
`ASSISTED MILLIMETER WAVE SYSTEMS
`
`Applicant: QUALCOMMIncorporated, San
`Diego, CA (US)
`
`Inventors: Navid ABEDINI, Raritan, NJ (US);
`Bilal SADIQ, Basking Ridge, NJ (US);
`Sundar SUBRAMANIAN,
`Bridgewater, NJ (US); Muhammad
`Nazmul ISLAM,Edison, NJ (US);
`Junyi LI, Chester, NJ (US)
`
`(21)
`
`Appl. No.: 15/789,633
`
`(22)
`
`Filed:
`
`Oct. 20, 2017
`
`Related U.S. Application Data
`
`(60)
`
`Provisional application No. 62/411,416, filed on Oct.
`21, 2016, provisional application No. 62/411,400,
`filed on Oct. 21, 2016.
`
`1100
`
`Publication Classification
`
`(51)
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. CL
`HO4W 74/00
`HOAL 27/26
`HOAL 5/00
`HO4W 56/00
`(52) U.S. Cl
`CPC ....... HO4W 74/006 (2013.01); HOAL 27/2666
`(2013.01); HO4W 52/04 (2013.01); HO4W
`56/004 (2013.01); HO4W 74/002 (2013.01):
`HOAL 5/0051 (2013.01)
`
`ABSTRACT
`(57)
`Certain aspects of the present disclosure provide techniques
`for assisted power control for an uplink signal transmitted
`during a RACH procedure. A UE may determine a transmit
`powerfor transmitting a message during a RACHprocedure
`with a secondary BS, based at least in part, on communi-
`cation between the UE and a primary BS. The UE may
`transmit the message to the second BS during the RACH
`procedure based,at least in part, on the determined transmit
`power.
`
`COMMUNICATE WITH AT LEAST ONE USER EQUIPMENT(UE) IN A
`FIRST FREQUENCY BAND
`
`TRANSMITTED AS PART OF THE ACCESS OR MANAGEMENT PROCESS
`
`DETERMINE AT LEAST PART OF RESOURCES AND CONFIGURATION
`FOR THE AT LEAST ONE UE FOR PARTICIPATING IN AT LEAST ONE OF
`AN ACCESS OR MANAGEMENT PROCEDURE IN A SECOND
`FREQUENCY BAND
`
`PROVIDE INFORMATION ABOUT THE RESOURCES AND
`CONFIGURATION TO THE AT LEAST ONE UE FOR SIGNALING TO BE
`
`SAMSUNG 1010
`
`SAMSUNG 1010
`
`1
`
`

`

`Patent Application Publication
`
`Apr. 26, 2018 Sheet 1 of 15
`
`US 2018/0115990 Al
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`
`2
`
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`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 2 of 15
`
`US 2018/0115990 Al
`
`200
`
`5G C-plane
`
`FIG, 2
`
`3
`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 3 of 15
`
`US 2018/0115990 Al
`
`
`
`FIG. 3
`
`4
`
`

`

`Patent Application Publication
`
`Apr. 26
`
`’
`
`2018 Sheet 4 of 15
`
`US 2018/0115990 Al
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`O9P
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`Patent Application Publication Apr. 26, 2018 Sheet 5 of 15
`
`US 2018/0115990 Al
`
`500
`
`
`
`FIG. 5
`
`6
`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 6 of 15
`
`US 2018/0115990 Al
`
`
`
`
`
`
`
`
`
`FIG. 6
`
`600
`
`\y
`
`PDCCH
`
`= DL Data
`Pe Common
`
`UL Burst
`
`700
`
`\y
`
`UL Burst
`
`V4) PDCCH
`AN UL Data
`Pa Common
`
`FIG. 7
`
`7
`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 7 of 15
`
`US 2018/0115990 Al
`
`800
`
`\
`
`804
`
`806
`
`———
`
`Lower frequency
`(sub6 GHz)
`
`Mmwfrequency
`(>6 GHz)
`
`802
`
`FIG. 8
`
`8
`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 8 of 15
`
`US 2018/0115990 Al
`
`900
`
`Directional SYNC and
`RACHconfiguration
`
`Directional SYNC
`
`Directional RAR
`
`Directional RACH
`
`FIG. 9
`
`9
`
`

`

`Patent Application Publication Apr. 26, 2018 Sheet 9 of 15
`
`US 2018/0115990 Al
`
`1000
`
`Directional SYNC
`configuration
`
`Directional SYNC
`
`Directional SYNC
`
`measurementreport
`
`Directional RACH
`configuration
`
`Directional RACH
`
`Determination of
`RACHconfiguration
`
`FIG, 10
`
`10
`
`10
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 10 of 15
`
`US 2018/0115990 Al
`
`1100
`
`COMMUNICATE WITH AT LEAST ONE USER EQUIPMENT(UE) IN A
`FIRST FREQUENCY BAND
`
`DETERMINE AT LEAST PART OF RESOURCES AND CONFIGURATION
`
`FOR THE AT LEAST ONE UE FOR PARTICIPATING IN AT LEAST ONE OF
`
`AN ACCESS OR MANAGEMENT PROCEDURE IN A SECOND
`
`TRANSMITTED AS PART OF THE ACCESS OR MANAGEMENT PROCESS
`
`FREQUENCY BAND
`
`PROVIDE INFORMATION ABOUT THE RESOURCES AND
`
`CONFIGURATION TO THE AT LEAST ONE UE FOR SIGNALING TO BE
`
`FIG. 11
`
`11
`
`11
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 11 of 15
`
`US 2018/0115990 Al
`
`1200
`
`COMMUNICATE WITH A FIRST BASE STATION(BS) IN A FIRST
`FREQUENCY BAND
`
`SECOND FREQUENCY BAND
`
`RECEIVE, FROMTHE FIRST BS, INFORMATION OF AT LEAST PART OF
`RESOURCES AND CONFIGURATIONS FOR PARTICIPATING IN AT
`LEAST ONE OF AN ACCESS OR MANAGEMENT PROCEDURESIN A
`
`FIG. 12
`
`12
`
`12
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 12 of 15
`
`US 2018/0115990 Al
`
`1300
`
`1302
`
`DETERMINE AT LEAST PART OF RESOURCES AND CONFIGURATION
`
`FOR AT LEAST ONE UE FOR PARTICIPATING IN AT LEAST ONE OF AN
`
`1302
`
`PROVIDE, TO THE SECOND BS, INFORMATION OF THE RESOURCES
`AND CONFIGURATION FOR THE AT LEAST ONE UE FOR SIGNALING
`
`TO BE TRANSMITTED AS PART OF THE ACCESS OR MANAGEMENT
`
`1304
`
`COMMUNICATE WITH AT LEAST A SECOND BS
`ACCESS OR MANAGEMENT PROCEDURE
`PROCESS
`AN ACCESS OR MANAGEMENT PROCEDURE
`
`PARTICIPATE WITH THE AT LEAST ONE UE IN AT THE LEAST ONE OF
`
`1304
`
`FIG. 13
`
`13
`
`13
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 13 of 15
`
`US 2018/0115990 Al
`
`1400
`
`DETERMINE A FIRST SET OF AT LEAST PART OF RESOURCES AND
`CONFIGURATION FOR THE AT LEAST ONE WIRELESS NODE (WN) FOR
`PARTICIPATING IN AT LEAST ONE OF AN ACCESS OR MANAGEMENT
`
`PROCEDURE
`
`1402
`
`DETERMINE A SECOND SET OF AT LEAST PART OF RESOURCES AND
`
`CONFIGURATION FOR AT LEAST ONE OF AN ACCESS OR
`
`1404
`
`MANAGEMENT PROCEDURE
`TRANSMITTED AS PART OF THE ACCESS OR MANAGEMENT PROCESS
`SECOND SET
`
`PROVIDE INFORMATION OF AT LEAST ONE OF THE FIRST SET AND
`
`THE SECOND SET TO THE AT LEAST ONE WN FORSIGNALING TO BE
`
`1406
`
`PARTICIPATEIN AT LEAST ONE OF ACCESS OR MANAGEMENT
`
`PROCEDURE USING AT LEAST ONE OF THE FIRST SET OR THE
`
`1408
`
`FIG. 14
`
`14
`
`14
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 14 of 15
`
`US 2018/0115990 Al
`
`1500
`
`COMMUNICATEWITH AT LEAST ONE WIRELESS NODE (WN)
`
`DETERMINE A FIRST SET OF AT LEAST PART OF RESOURCES AND
`CONFIGURATION FOR THE AT LEAST ONE WIRELESS NODE (WN) FOR
`PARTICIPATING IN AT LEAST ONE OF AN ACCESS OR MANAGEMENT
`
`PROCEDURE WITH A SECOND BS
`
`PROCESS
`
`TRANSMIT AT LEAST ONE OR MORE SIGNALS TO THE AT LEAST ON
`
`WN TO PROVIDE INFORMATION OF THE FIRST SET FOR SIGNALING
`
`TO BE TRANSMITTED AS PART OF THE ACCESS OR MANAGEMENT
`
`FIG. 15
`
`15
`
`15
`
`

`

`Patent Application Publication Apr. 26,2018 Sheet 15 of 15
`
`US 2018/0115990 Al
`
`1600
`
`RECEIVE INFORMATIONOFA FIRST SET OF AT LEAST PART OF
`
`RESOURCES AND CONFIGURATION FOR PARTICIPATING IN AT LEAST
`
`ONE OF AN ACCESS OR MANAGEMENT PROCEDURE WITH A FIRST
`BASE STATION(BS)
`
`SECOND SET WITH THE FIRST BS
`
`RECEIVE INFORMATION OF A SECOND SET OF AT LEAST PART OF
`
`RESOURCES AND CONFIGURATION FOR AT LEAST ONE OF AN
`
`ACCESS OR MANAGEMENT PROCEDUREWITH THE FIRST BS
`
`PARTICIPATEIN AT LEAST ONE OF ACCESS OR MANAGEMENT
`PROCEDURE USING AT LEAST ONE OF THE FIRST SET AND THE
`
`FIG. 16
`
`16
`
`16
`
`

`

`US 2018/0115990 Al
`
`Apr. 26, 2018
`
`DIRECTIONAL SYNCHRONIZATION IN
`ASSISTED MILLIMETER WAVE SYSTEMS
`
`CLAIM OF PRIORITY UNDER 35 U.S.C. § 119
`
`[0001] The present Application for Patent claims benefit of
`U.S. Provisional Patent Application Ser. No. 62/411,416,
`filed Oct. 21, 2016 and U.S. Provisional Patent Application
`Ser. No. 62/411,400, filed Oct. 21, 2016, assigned to the
`assignee hereof and hereby expressly incorporated by ref-
`erence herein.
`
`BACKGROUND
`
`Field of the Disclosure
`
`[0002] Aspects of the present disclosure relate to wireless
`communications, and more particularly, to a base station
`(BS)assisting a user equipment (UE)in establishing initial
`access and data transmissions with another BS.
`
`Description of Related Art
`
`are widely
`communication systems
`[0003] Wireless
`deployed to provide various telecommunication services
`such as telephony, video, data, messaging, and broadcasts.
`Typical wireless communication systems may employ mul-
`tiple-access technologies capable of supporting communi-
`cation with multiple users by sharing available system
`resources (e.g., bandwidth, transmit power). Examples of
`such multiple-access technologies include Long Term Evo-
`lution (LTE)
`systems,
`code division multiple access
`(CDMA)systems, time division multiple access (TDMA)
`systems, frequency division multiple access (FDMA)sys-
`tems, orthogonal
`frequency division multiple
`access
`(OFDMA)systems, single-carrier frequency division mul-
`tiple access (SC-FDMA) systems, and time division syn-
`chronous code division multiple access (TD-SCDMA)sys-
`tems.
`
`In some examples, a wireless multiple-access com-
`[0004]
`munication system may include a numberofbasestations,
`each simultaneously supporting communication for multiple
`communication devices, otherwise knownas user equipment
`(UEs). In LTE or LTE-A network, a set of one or more base
`stations may define an eNodeB (eNB). In other examples
`(e.g.,
`in a next generation or 5G network), a wireless
`multiple access communication system may include a num-
`ber of distributed units (DUs) (e.g., edge units (EUs), edge
`nodes (ENs), radio heads (RHs), smart radio heads (SRHs),
`transmission reception points (TRPs), etc.) in communica-
`tion with a numberof central units (CUs)(e.g., central nodes
`(CNs), access node controllers (ANCs), etc.), where a set of
`one or more distributed units,
`in communication with a
`central unit, may define an access node (e.g., a new radio
`base station (NR BS), a new radio node-B (NR NB), a
`network node, 5G NB, gNB, etc.). A base station or DU may
`communicate with a set of UEs on downlink channels (e.g.,
`for transmissions from a base station or to a UE) and uplink
`channels (e.g., for transmissions from a UEto a basestation
`or distributed unit).
`[0005] These multiple access technologies have been
`adopted in various telecommunication standards to provide
`a commonprotocolthat enables different wireless devices to
`communicate on a municipal, national, regional, and even
`global level. An example of an emerging telecommunication
`standard is new radio (NR), for example, 5G radio access.
`
`NRis a set of enhancements to the LTE mobile standard
`promulgated by Third Generation Partnership Project
`(3GPP). NR is designed to better support mobile broadband
`Internet access by improving spectral efficiency, lowering
`costs, improving services, making use of new spectrum, and
`better integrating with other open standards using OFDMA
`with a cyclic prefix (CP) on the downlink (DL) and on the
`uplink (UL) as well as support beamforming, multiple-input
`multiple-output (MIMO) antenna technology, and carrier
`aggregation.
`[0006] However, as the demand for mobile broadband
`access continues to increase, there exists a need for further
`improvements in NR technology. These improvements may
`be applicable to other multi-access technologies and the
`telecommunication standards that employ these technolo-
`gies.
`
`SUMMARY
`
`[0007] The systems, methods, and devices of the disclo-
`sure each have several aspects, no single one of which is
`solely responsible for its desirable attributes. Without lim-
`iting the scope of this disclosure as expressed by the claims
`which follow, some features will now be discussedbriefly.
`After considering this discussion, and particularly after
`reading the section entitled “Detailed Description” one will
`understand how the features of this disclosure provide
`advantagesthat include improved communications between
`access points and stations in a wireless network.
`[0008] Certain aspects of the present disclosure relate to
`methods and apparatus for assisting a UE in performing
`initial access to a BS. As described herein, a first BS may
`communicate with at least one user equipments (UEs) in a
`first frequency spectrum, allocate resources to the at least
`one UEforparticipating in at least one ofassisted directional
`initial access, beam management, mobility management,
`radio resource management (RRM), or radio link monitoring
`(RLM)in a second frequency spectrum, and provide con-
`figuration information to the at least one UEforat least one
`of a directional synchronization signal, a beam reference
`signal (e.g. CSI-RS), or a random access message (e.g.
`RACHpreamble, message2, message3, or message4) to be
`transmitted as part of the assisted directional initial access,
`beam management, mobility management, RRM or RLM.
`[0009] Certain aspects of the present disclosure relate to
`methods and apparatus for assisting a UE in performing at
`least one of initial access, beam management, RRM, or
`RLM by a UE. Asdescribed herein, theVUE may commu-
`nicate with a first base station (BS) in a first frequency
`spectrum, receive an allocation of resources and configura-
`tion information from the first BS for a at least one of a
`directional synchronization signal, a beam reference signal,
`or a random access message to be used by a second BS
`operating in a second frequency spectrum aspart ofat least
`one of an initial access, beam management, mobility man-
`agement, RRM, or RLM procedures, wherein the configu-
`ration information is specific to the UE or to a set of UEs
`including the UE,and participate in theat least one ofinitial
`access, beam management, mobility management, RRM,or
`RLMprocedures with the second BS in accordance with the
`configuration information.
`[0010] Certain aspects of the present disclosure relate to
`methods and apparatus for a BS to participate in at least one
`of initial access, beam management, RRM, or RLM proce-
`dures with a UE. Asdescribed herein, the BS may determine
`
`17
`
`17
`
`

`

`US 2018/0115990 Al
`
`Apr. 26, 2018
`
`an allocation of resources and configuration information for
`at least one of a directional synchronization signal, a beam
`reference signal, a random access message to be used by a
`user equipment (UE) and the BS in a first frequency spec-
`trum as part of at
`least one of an initial access, beam
`management, mobility management, RRM, or RLM proce-
`dures, wherein the configuration information is specific to
`the UEorto a set of UEs including the UE participate in the
`at least one of initial access, beam management, mobility
`management, RRM, or RLM procedures with the UE in
`accordance with the configuration information.
`[0011] Aspects generally include methods, apparatus, sys-
`tems, computer readable mediums, and processing systems,
`as substantially described herein with reference to and as
`illustrated by the accompanying drawings.
`[0012]
`To the accomplishmentof the foregoing andrelated
`ends, the one or more aspects comprise the features here-
`inafter fully described and particularly pointed out in the
`claims. The following description and the annexed drawings
`set forth in detail certain illustrative features of the one or
`
`more aspects. These features are indicative, however, of but
`a few of the various ways in which the principles of various
`aspects may be employed, and this description is intended to
`include all such aspects and their equivalents.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`So that the manner in which the above-recited
`[0013]
`features of the present disclosure can be understoodindetail,
`a moreparticular description, briefly summarized above,
`may be had by reference to aspects, some of which are
`illustrated in the appended drawings.
`It
`is to be noted,
`however, that the appended drawingsillustrate only certain
`typical aspects of this disclosure and are therefore not to be
`considered limiting of its scope, for the description may
`admit to other equally effective aspects.
`[0014]
`FIG. 1 is a block diagram conceptually illustrating
`an example telecommunications system, in accordance with
`certain aspects of the present disclosure.
`[0015]
`FIG. 2 is a block diagram illustrating an example
`logical architecture of a distributed RAN,in accordance with
`certain aspects of the present disclosure.
`[0016]
`FIG. 3 is a diagram illustrating an example physi-
`cal architecture of a distributed RAN, in accordance with
`certain aspects of the present disclosure.
`[0017]
`FIG. 4 is a block diagram conceptually illustrating
`a design of an example BS and user equipment (UE), in
`accordance with certain aspects of the present disclosure.
`[0018]
`FIG. 5 is a diagram showing examples for imple-
`menting a communication protocol stack,
`in accordance
`with certain aspects of the present disclosure.
`[0019]
`FIG. 6 illustrates an example of a DL-centric
`subframe, in accordance with certain aspects of the present
`disclosure.
`
`FIG. 7 illustrates an example of an UL-centric
`[0020]
`subframe, in accordance with certain aspects of the present
`disclosure.
`
`FIG. 8 illustrates an example wireless communi-
`[0021]
`cation system, in which aspects of the present disclosure
`may be implemented.
`[0022]
`FIG. 9 illustrates an example of assisted initial
`access in a millimeter wave system,
`in accordance with
`certain aspects of the present disclosure.
`
`FIG. 10 illustrates another example of assisted
`[0023]
`initial access in a millimeter wave system, in accordance
`with certain aspects of the present disclosure.
`[0024]
`FIG. 11 illustrates example operations performed
`by a basestation to assist a UE in initial access with another
`base station,
`in accordance with certain aspects of the
`present disclosure.
`[0025]
`FIG. 12 illustrates example operations performed
`by a UE, in accordance with certain aspects of the present
`disclosure.
`[0026]
`FIG. 13 illustrates example operations performed
`by a basestation for initial access with a UE, in accordance
`with certain aspects of the present disclosure.
`[0027]
`FIGS. 14-16 illustrate example operations for uti-
`lizing multiple sets of resources and configurations,
`in
`accordance with certain aspects of the present disclosure.
`[0028]
`To facilitate understanding,
`identical
`reference
`numerals have been used, where possible,
`to designate
`identical elements that are common to the figures.
`It
`is
`contemplated that elements described in one aspect may be
`beneficially utilized on other aspects without specific reci-
`tation.
`
`DETAILED DESCRIPTION
`
`[0029] Aspects of the present disclosure provide appara-
`tus, methods, processing systems, and computer readable
`mediums for new radio (NR) (new radio access technology
`or 5G technology).
`[0030] NR may support various wireless communication
`services, such as Enhanced mobile broadband (eMBB)tar-
`geting wide bandwidth (e.g. 80 MHz beyond), millimeter
`wave (mmW)targeting high carrier frequency (e.g. 27 GHz
`or beyond), massive MTC (mMTC)targeting non-backward
`compatible MTC techniques, and/or missioncritical target-
`ing ultra reliable low latency communications (URLLC).
`These services may include latency andreliability require-
`ments. These services may also have different transmission
`time intervals (TTI) to meet respective quality of service
`(QoS) requirements. In addition, these services may co-exist
`in the same subframe.
`
`[0031] The following description provides examples, and
`is not limiting of the scope, applicability, or examples set
`forth in the claims. Changes may be made in the function
`and arrangement of elements discussed without departing
`from the scope of the disclosure. Various examples may
`omit, substitute, or add various procedures or components as
`appropriate. For instance, the methods described may be
`performed in an order different from that described, and
`various steps may be added, omitted, or combined. Also,
`features described with respect to some examples may be
`combined in some other examples. For example, an appa-
`ratus may be implemented or a method may bepracticed
`using any numberofthe aspects set forth herein. In addition,
`the scope of the disclosure is intended to cover such an
`apparatus or method which is practiced using other struc-
`ture, functionality, or structure and functionality in addition
`to or other than the various aspects of the disclosure set forth
`herein.
`It should be understood that any aspect of the
`disclosure described herein may be embodied by one or
`more elements of a claim. The word “exemplary” is used
`herein to mean “serving as an example, instance, or illus-
`tration.” Any aspect described herein as “exemplary” is not
`necessarily to be construed as preferred or advantageous
`over other aspects.
`18
`
`18
`
`

`

`US 2018/0115990 Al
`
`Apr. 26, 2018
`
`[0032] The techniques described herein may be used for
`various wireless communication networks such as LTE,
`CDMA, TDMA, FDMA, OFDMA, SC-FDMA andother
`networks. The terms “network”and “system”are often used
`interchangeably. A CDMA network may implementa radio
`technology such as Universal Terrestrial Radio Access
`(UTRA), cdma2000, etc. UTRA includes Wideband CDMA
`(WCDMA)andother variants of CDMA. cdma2000 covers
`IS-2000, IS-95 and IS-856 standards. A TDMA network may
`implement a radio technology such as Global System for
`Mobile Communications (GSM). An OFDMA network may
`implement a radio technology such as NR (e.g. 5G RA),
`Evolved UTRA (E-UTRA), Ultra Mobile Broadband
`(UMB), TEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),
`IEEE 802.20, Flash-OFDMA,etc. UTRA and E-UTRA are
`part of Universal Mobile Telecommunication System
`(UMTS). NRis an emerging wireless communications tech-
`nology under development
`in conjunction with the 5G
`Technology Forum (SGTF). 3GPP Long Term Evolution
`(LTE) and LTE-Advanced (LTE-A) are releases of UMTS
`that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A
`and GSM are described in documents from an organization
`named “3rd Generation Partnership Project”
`(3GPP).
`cdma2000 and UMBare described in documents from an
`organization named “3rd Generation Partnership Project 2”
`(3GPP2). The techniques described herein may be used for
`the wireless networks and radio technologies mentioned
`above as well as other wireless networks and radio tech-
`
`nologies. For clarity, while aspects may be described herein
`using terminology commonly associated with 3G and/or 4G
`wireless technologies, aspects of the present disclosure can
`be applied in other generation-based communication sys-
`tems, such as 5G andlater, including NR technologies.
`
`tion may operate in a different frequency spectrum than the
`BS to which the UE transmits the RACHsignaling using the
`determined powercontrol.
`[0037] As described herein, for example, with respect to
`FIG.8, procedures related a UE communicating with a BS
`via multiple beams, such as initial access and data trans-
`missions, including (but not limited to) beam management,
`mobility management, RRM, and/or RLM maybe simpli-
`fied with assistance from a BS operating in a lowerfre-
`quency spectrum. With the assistance of the BS operating in
`a lower frequency spectrum, mmWave resources may be
`conserved and, in certain scenarios, initial synchronization
`to the mmWave network may be completely or partly
`bypassed.
`[0038] UEs 120 maybe configured to perform the opera-
`tions 900 and methods described herein for determining a
`transmit power. BS 110 may comprise a transmission recep-
`tion point (TRP), Node B (NB), 5G NB, access point (AP),
`new radio (NR) BS, Master BS, primary BS,etc.). The NR
`network 100 may include the central unit. The BS 110 may
`perform the operations 1000 and other methods described
`herein for providing assistance to a UE in determining a
`transmit power to use during a RACH procedure with
`another BS (e.g., a secondary BS).
`[0039] A UE 120 may determine a transmit power for
`transmitting a message during a RACH procedure with a
`secondary BS, based at least in part, on communication
`between the VE and a primary BS. The UE maytransmit the
`message to the secondary BS during the RACH procedure
`based, at least in part, on the determined transmit power.
`[0040] A BS 110, such as a master BS or a primary BS,
`may communicate with the UE and may take one or more
`actions to assist the UE in setting a transmit power for
`transmitting a message during the RACH procedure with a
`secondary BS.
`[0041]
`Asillustrated in FIG. 1, the wireless network 100
`may include a numberof BSs 110 and other network entities.
`According to one example, the network entities including
`the BS and UEs may communicate on high frequencies(e.g.,
`>6 GHz) using beams. One or more BS may also commu-
`nicate at a lower frequency (e.g., <6 GHz). The one or more
`BS configured to operate in a high frequency spectrum and
`the one or more BS configured to operate in a lower
`frequency spectrum may be co-located.
`[0042] A BS may bea station that communicates with
`UEs. Each BS 110 may provide communication coverage
`[0034] Aspects of the present disclosure provide tech-
`for a particular geographic area. In 3GPP, the term “cell” can
`niques and apparatus for assisting a UE in determining a
`refer to a coverage area of a Node B and/or a Node B
`transmit power for use during a RACH procedure. Accord-
`subsystem serving this coverage area, depending on the
`ing to one example, a UE may wantto establish communi-
`context in which the term is used. In NR systems, the term
`cation with a BS operating in a millimeter-wave (mmWave)
`“cell” and gNB, Node B, 5G NB, AP, NR BS, NR BS, or
`frequency spectrum. The UE mayreceive assistance infor-
`TRP maybeinterchangeable. In some examples, a cell may
`mation for determining the transmit powerto use during the
`not necessarily be stationary, and the geographic area of the
`RACHprocedure from a BS operating in a lower frequency
`cell may move according to the location of a mobile base
`spectrum than the mmWavespectrum.
`station. In some examples, the base stations may be inter-
`[0035]
`For illustrative purposes, aspects are described
`connected to one another and/or to one or more other base
`with reference to a primary BS andasecondary BS, wherein
`stations or network nodes (not shown) in the wireless
`the secondary BS operates in an mmWavefrequency spec-
`network 100 through various types of backhaul interfaces
`trum and the primary BS operations in a lower frequency
`such as a direct physical connection, a virtual network,or the
`spectrum that the secondary spectrum; however, aspects
`like using any suitable transport network.
`may not be limited to this example scenario.
`[0036] More generically, the UE may receive assistance
`[0043]
`In general, any number of wireless networks may
`information from one BS that may be used to determine
`be deployed in a given geographic area. Each wireless
`powercontrol for transmissions during a RACH procedure
`network may support a particular radio access technology
`with another BS. The BS providing the assistance informa-
`(RAT) and may operate on one or more frequencies. ARAT
`19
`
`Example Wireless Communications System
`
`FIG.1 illustrates an example wireless network 100
`[0033]
`in which aspects of the present disclosure may be performed.
`For example, the wireless network may be a new radio (NR)
`or 5G network. NR wireless communication systems may
`employ beams, where a BS and UE communicate via active
`beams. In scenarios where a BS may communicate with a
`UEusing active beams, the UE may benefit from assistance
`in determining a transmit power to use for transmitting a
`message during a random access channel (RACH) proce-
`dure.
`
`19
`
`

`

`US 2018/0115990 Al
`
`Apr. 26, 2018
`
`may also be referred to as a radio technology, an air
`interface, etc. A frequency may also be referred to as a
`carrier, a frequency channel, etc. Each frequency may sup-
`port a single RAT in a given geographic area in order to
`avoid interference between wireless networks of different
`RATs. In some cases, NR or 5G RAT networks may be
`deployed.
`[0044] ABS may provide communication coverage for a
`macro cell, a pico cell, a femto cell, and/or other types of
`cell. A macro cell may covera relatively large geographic
`area (e.g., several kilometers in radius) and may allow
`unrestricted access by UEs with service subscription. A pico
`cell may covera relatively small geographic area and may
`allow unrestricted access by UEs with service subscription.
`A femto cell may cover a relatively small geographic area
`(e.g., a home) and may allow restricted access by UEs
`having association with the femtocell (e.g., UEs in a Closed
`Subscriber Group (CSG), UEs for users in the home,etc.).
`ABS for a macro cell may be referred to as a macro BS. A
`BS for a pico cell may be referred to as a pico BS. A BS for
`a femto cell may be referred to as a femto BS or a home BS.
`In the example shown in FIG. 1, the BSs 110a, 1106 and
`110c may be macro BSs for the macro cells 102a, 1026 and
`102c, respectively. The BS 110x may be a pico BS for a pico
`cell 102x. The BSs 110y and 110z may be femto BS for the
`femto cells 102y and 102z, respectively. A BS may support
`one or multiple (e.g., three) cells.
`[0045] The wireless network 100 may also include relay
`stations. A relay station is a station that receives a transmis-
`sion of data and/or other information from an upstream
`station (e.g., a BS or a UE) and sendsa transmission of the
`data and/or other information to a downstream station (e.g.,
`a UE ora BS). A relay station may also be a UEthatrelays
`transmissions for other UEs. In the example shown in FIG.
`1, a relay station 1107 may communicate with the BS 110a
`and a UE 120rin orderto facilitate communication between
`
`the BS 110a@ and the UE 120A relay station may also be
`referred to as a relay BS, a relay, etc.
`[0046] The wireless network 100 may be a heterogeneous
`network that includes BSs of different types, e.g., macro BS,
`pico BS, femto BS,relays, etc. These different types of BSs
`may have different transmit powerlevels, different coverage
`areas, and different impact on interference in the wireless
`network 100. For example, macro BS may have a high
`transmit powerlevel (e.g., 20 Watts) whereas pico BS, femto
`BS, and relays may have a lowertransmit powerlevel(e.g.,
`1 Watt).
`[0047] The wireless network 100 may support synchro-
`nous or asynchronousoperation. For synchronousoperation,
`the BSs may have similar frame timing, and transmissions
`from different BSs may be approximately aligned in time.
`For asynchronous operation, the BSs may have different
`frame timing, and transmissions from different BSs may not
`be aligned in time. The techniques described herein may be
`used for both synchronous and asynchronous operation.
`[0048] A network controller 130 may couple to a set of
`BSs andprovide coordination and control for these BSs. The
`network controller 130 may communicate with the BSs 110
`via a backhaul. The BSs 110 may also communicate with
`one another, e.g., directly or indirectly via wireless or
`wireline backhaul.
`
`[0049] The UEs 120 (e.g., 120x, 120), etc.) may be
`dispersed throughoutthe wireless network 100, and each UE
`maybestationary or mobile. A UE mayalso bereferred to
`
`as a mobile station, a terminal, an access terminal, a sub-
`scriber unit, a station, a Customer Premises Equipment
`(CPE), a cellular phone, a smart phone, a personal digital
`assistant (PDA), a wireless modem, a wireless communica-
`tion device, a handheld device, a laptop computer, a cordless
`phone, a wireless local
`loop (WLL) station, a tablet, a
`camera, a gaming device, a netbook, a smartbook, an
`ultrabook, a medical device or medical equipment, a bio-
`metric sensor/device, a wearable device such as a smart
`watch, smart clothing, smart glasses, a smart wrist band,
`smart jewelry (e.g., a smart ring, a smart bracelet, etc.), an
`entertainment device (e.g., a music device, a video device,
`a satellite radio, etc.), a vehicular component or sensor, a
`smart meter/sensor, industrial manufacturing equipment, a
`global positioning system device, or any other suitable
`device that is configured to communicate via a wireless or
`wired medium. Some UEs may be considered evolved or
`machine-type communication (MTC) devices or evolved
`MTC (eMTC) devices. MTC and eMTC UEsinclude, for
`example, robots, drones, remote devices, sensors, meters,
`monitors, location tags, etc., that may communicate with a
`BS, another device (e.g., remote device), or some other
`entity. A wireless node may provide, for example, connec-
`tivity for or to a network(e.g., a wide area network such as
`Internet or a cellular network) via a wired or wireless
`communication link. Some UEs may be considered Internet-
`of-Things (IoT) devices.
`[0050]
`In FIG.1, a solid line with double arrowsindicates
`desired transmissions between a UE anda serving BS, which
`is a BS designated to serve the UE on the downlink and/or
`uplink. A dashed line with double arrows indicates interfer-
`ing transmissions between a UEand a BS.
`[0051] Certain wireless networks
`(e.g., LTE) utilize
`orthogonal frequency division multiplexing (OFDM)on the
`downlink and single-carrier frequency division multiplexing
`(SC-FDM)on the uplink. OFDM and SC-FDMpartition the
`system bandwidth into multiple (KX) orthogonal subcarriers,
`which are also commonly referred to as tones, bins, etc.
`Each subcarrier may be modulated with data. In general,
`modulation symbols are sent in the fr