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`w o 2014/078676 A2 |IMINIMVIM INIIN INTACTATCA
`
`—_without international search report and to be republished
`upon receipt ¢ that report (Rule 48.2(g))
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`Published:
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`2
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`
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`WO2014/078676
`
`PCT/US2013/070338
`
`CHANNEL EVACUATION PROCEDURES FOR WIRELESS NETWORKS
`
`DEPLOYED IN DYNAMIC SHARED SPECTRUM
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`
`CROSS REFERENCE TO RELATED APPLICATIONS
`
`[0001]
`
`This application claims the benefit of U.S. Provisional Patent Application No.
`
`61/726,871 filed November 15, 2012, the contents of which are hereby incorporated by reference
`
`herein.
`
`BACKGROUND
`
`[0002]
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`When a wireless system operates in a secondary fashion in dynamic shared
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`spectrum (DSS), it may allow usage of the spectrum to a system which has a higher usage
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`priority for the spectrum. Such higherpriority systems may include primary users (PU) in
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`Television White Space (TVWS), or Licensed Shared Access (LSA) incumbents in case of the
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`spectrum under the LSA regime.
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`[0003]
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`To operate in DSS such as TVWS,the devices(e.g., complying with regulatory
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`requirements) may benefit by gaining access to free channels.
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`In majorcities that have limited
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`or no TVWSchannels available, sensing only operation may becomeessential as a means to gain
`
`access to more channels. Below roofline deployments, for example, may benefit from the
`
`isolation brought by the urban landscape from the digital TV (DTV)transmitters. Further,
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`indoor deployments may benefit from the indoor penetration loss.
`
`In this context, sensing only
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`operation may comply with specific requirements on Spectrum Sensing allowing a smallcell
`
`network to make use of a PU-assigned channel. The PU-Assigned channel(e.g., assigned to a
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`primary user) may require a secondary user (SU) to leave the channel, if the primary useris
`
`detected. Similarly, the LSA regime mayensure the protection of the LSA incumbentto
`
`interference from the LSAlicensee, as well as a guarantee that the LSA incumbent has
`
`prioritized access to the spectrum that the incumbent ownsand sublicenses. The connected
`
`-|f-
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`3
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`WO2014/078676
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`PCT/US2013/070338
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`mode mechanisms maybe neededto provide support for PU detection, reporting and/or channel
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`evacuation, e.g., when a system operates on DSSspectrum in a secondary fashion.
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`SUMMARYOFTHE INVENTION
`
`[0004]
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`Systems, methods, and instrumentalities are described for channel evacuation of a
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`shared spectrum channel. In shared spectrum, a secondary user system may use spectrum. The
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`spectrum may beutilized and/or controlled by an incumbent system. A secondary user base
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`station may provide one or more secondary user wireless transmit receive unit (WTRUs) access
`
`to a shared spectrum channel. The secondary user base station may include, but not limited to, a
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`licensed shared access (LSA)licensee base station, a TVWSbasestation, a dynamic shared
`
`spectrum access point and/orthe like.) The secondary user base station may receive an
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`evacuation message indicating a need for the secondary userbase station and WTRUsto
`
`evacuate the shared spectrum channel. The evacuation message may include an alternate
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`channel for use by the secondary user WTRUs. The evacuation message may include a system
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`evacuation message. The secondary userbasestation may receive the evacuation message from
`
`a database entity or a broker entity. The secondary user base station may checkthe status of a
`
`shared spectrum channel with a database or a broker to determine the need to evacuate the shared
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`spectrum channel. The secondary user may receive an evacuation messagein response to the
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`shared spectrum channelstatus check.
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`[0005]
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`The secondary user base station may receive the evacuation message from a
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`managemententity, e.g., based on a pre-determined channel evacuation time. The pre-
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`determined channel evacuation time may be based on an agreement between an incumbent
`
`system operator and a secondary user operator. The allowable use of the channel by the
`
`secondary system maybe periodic. The evacuation time may re-occur one or more times. The
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`pre-determined evacuation time may be based on an allowed time for the use of the shared
`
`spectrum channel by the secondary user WTRUs. The shared spectrum channel may be an LSA
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`channel.
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`[0006]
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`The secondary user base station may coordinate channel evacuation of the shared
`
`spectrum channelin response to the evacuation message. The secondary userbase station may
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`send an evacuation complete message to an incumbentuser(e.g., an incumbentbasestation).
`
`The incumbent user maybe the primary user (PU). The evacuation complete message may
`
`indicate to the incumbentuser that the evacuation of the shared spectrum channel has been
`
`completed. The system evacuation message may comprise an X2 messagereceived via an X2
`
`interface. The secondary userbase station may selecta targetcell, e.g., based on at least one of
`
`-2-
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`4
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`WO2014/078676
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`PCT/US2013/070338
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`an event notification, a secondary user WTRU measurementreport, or an neighborrelational
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`table (NRT) entry. The secondary user base station may send a handoverrequestto the target
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`cell.
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`[0007]
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`The secondary user base station may send a measurement event configuration to
`
`the secondary user WTRUs. The measurement event configuration may includeat least one of a
`
`
`
`
`