1. A method for signaling an ad-hoc group of mobile units (MUs), the method comprising:
deriving a mobile unit group identifier (MUGI) by combining individual mobile unit identifiers (MUIs) of a plurality of MUs for which signaling awaits transmission via a wireless communication resource; and
transmitting, via the wireless communication resource, combined signaling comprising the derived MUGI, wherein the combined signaling comprises the MUGI and at least one paging indicator selected from the group consisting of:
an indication of whether an acknowledgment to a response to the combined signaling is to be requested by a responding MU,
an indication of what type of signaling in response to the combined signaling is requested from a responding MU,
an indication of a persistence level with which a responding MU should respond to the combined signaling,
an indication of a communication service to which the combined signaling pertains,
an indication to switch to an unslotted mode,
an indication to switch to a semi-dormant mode,
an indication to switch to a page monitoring mode using a reduced slot cycle index, and
an indication of whether the combined signaling is a last combined signaling in a present paging slot.
2. The method of claim 1 further comprising:
determining, prior to transmitting the combined signaling, that the wireless communication resource has insufficient bandwidth to convey signaling individually to the plurality of MUs during a targeted time period.
3. The method of claim 2 wherein the targeted time period comprises a paging slot.
4. The method of claim 1 wherein the wireless communication resource comprises a channel selected from the group consisting of: a paging channel, a shared control channel, and a common control channel.
5. The method of claim 1 wherein the MUI of each MU of the plurality of MUs is derived from an identifier of each MU selected from the group consisting of:
an international mobile subscriber identity,
an international mobile equipment identifier,
a mobile equipment identifier,
an electronic serial number,
a user identity module identifier,
a UMTS subscriber information module identifier,
a subscriber identity module identifier,
a temporary subscription identifier,
a media access control identifier,
a Unicast Access Terminal Identifier, and
an Internet Protocol address.
6. The method of claim 1 wherein combining individual MUIs comprises performing a bitwise logical OR of all the individual MUIs.
7. The method of claim 1 wherein deriving the MUGI comprises hashing at least a portion of each identifier of the plurality of MUs to produce the individual MUIs.
8. The method of claim 7 wherein the MUGI comprises a portion having M bits, wherein an nth bit of the M bits is set for each MU of the plurality of MUs and wherein n, for each MU of the plurality of MUs, equals one plus modulo M of an identifier of the respective MU.
9. The method of claim 8 wherein the MUGI comprises a first portion in which M=29, a second portion in which M=31, a third portion in which M=33, and a fourth portion in which M=35.
10. The method of claim 1 wherein transmitting combined signaling comprises paging a group of MUs using a group page message.
11. The method of claim 1 wherein the persistence level indicated is based on an estimated size of a group of MUs that may respond to the combined signaling.
12. The method of claim 1 wherein the indication of the communication service to which the combined signaling pertains comprises a compressed service option indicator.
13. The method of claim 1 further comprising:
selecting the plurality of MUs, whose MUIs will be used to derive the MUGI, based on at least one factor selected from the group consisting of:
whether a quick paging channel (QPCH) is provided in a paging area,
a transmit power level of the QPCH,
a slot cycle index used in the paging area,
a present loading level of an access channel associated with the wireless communication resource,
a number of MUs known to be registered in the paging area,
a number of MUs known to be registered in the paging area that also support group signaling of MUs,
what communication service is targeted,
a present loading level of the wireless communication resource, and
an estimated number of MUs that may respond to signaling comprising a MUGI resulting from a given plurality of MUs.
14. The method of claim 1 further comprising:
determining to exclude a potential MU from the plurality of MUs, whose MUIs will be used to derive the MUGI, based on at least one factor selected from the group consisting of:
a service class associated with the potential MU,
whether the potential MU has been included in an earlier plurality of MUs, whose MUIs were used to derive an earlier MUGI, for which no response was received,
a battery level of the potential MU,
a plugged-inbattery-only operating mode of the potential MU, and
a number of other MUs expected to false if the potential MU is included in the plurality of MUs.
15. The method of claim 1 further comprising:
determining to include a potential MU in the plurality of MUs, whose MUIs will be used to derive the MUGI, based on at least one factor selected from the group consisting of:
whether the potential MU is a member of a push-to-talk group that is being signaled,
whether the potential MU has low priority signaling awaiting transmission,
whether the potential MU needs to be paged for a multicast, and
whether the potential MU has a presence update request awaiting transmission.
16. The method of claim 1 further comprising:
receiving responsive signaling from an MU ambiguously addressed by the MUGI but not a member of the plurality of MUs, whose MUIs were used to derive the MUGI, wherein the MU ambiguously addressed is a falsing MU; and
in response to the responsive signaling, performing at least one step selected from the group consisting of:
updating a location of the falsing MU,
registering the falsing MU,
performing a semi-dormant update for the falsing MU,
signaling the falsing MU,
interpreting the responsive signaling from the falsing MU as a presence update, and
ignoring the responsive signaling from the falsing MU.
17. A method for receiving signaling directed to an ad-hoc group of mobile units, the method comprising:
receiving, by a mobile unit (MU) via a wireless communication resource, signaling that comprises a mobile unit group identifier (MUGI);
determining, by the MU, whether the MUGI is derived from a mobile unit identifier (MUI) of the MU in combination with at least one other MUI from at least one other MU; and
when the MU determines that the MUGI is derived from the MUI of the MU, processing the signaling as directed to the MU;
wherein determining whether the MUGI is derived from the MUI of the MU comprises performing a bitwise logical AND of the MUGI and the MUI of the MU.
18. The method of claim 17 wherein the MUI of the MU is derived by hashing at least a portion of an identifier of the MU.
19. The method of claim 17 wherein the MUGI comprises a portion having M bits, wherein an nth bit of the M bits is set for each MU whose MUI is combined into the MUGI, and wherein n, for each MU, equals one plus modulo M of an identifier of the respective MU.
20. The method of claim 17 further comprising:
when the MU determines that the MUGI is derived from the MUI of the MU, determining not to send a response to the signaling based on at least one condition selected from the group consisting of:
whether the MU has a low battery,
whether the MU has an associated service class that provides enhanced battery life,
whether the MU does not participate in a communication service indicated by the signaling, and
whether the MU detects subsequent signaling that indicates that another MU responded to the signaling.
21. A radio access network comprising:
a transceiver; and
a controller, communicatively coupled to the transceiver,
for deriving a mobile unit group identifier (MUGI) by combining individual mobile unit identifiers of a plurality of mobile units (MUs) for which signaling awaits transmission via a wireless communication resource; and
for transmitting, via the transceiver and the wireless communication resource, combined signaling comprising the derived MUGI, wherein the combined signaling comprises the MUGI and at least one paging indicator selected from the group consisting of:
an indication of whether an acknowledgment to a response to the combined signaling is to be requested by a responding MU,
an indication of what type of signaling in response to the combined signaling is requested from a responding MU,
an indication of a persistence level with which a responding MU should respond to the combined signaling,
an indication of a communication service to which the combined signaling pertains,
an indication to switch to an unslotted mode,
an indication to switch to a semi-dormant mode,
an indication to switch to a page monitoring mode using a reduced slot cycle index, and
an indication of whether the combined signaling is a last combined signaling in a present paging slot.
22. A mobile unit (MU) comprising:
a transceiver; and
a processing unit, communicatively coupled to the transceiver,
for receiving, via a wireless communication resource and the transceiver, signaling that comprises a mobile unit group identifier (MUGI),
for determining whether the MUGI is derived from a mobile unit identifier (MUI) of the MU in combination with at least one other MUI from at least one other MU, and
for processing the signaling as directed to the MU when the MU determines that the MUGI is derived from the MUI of the MU,
wherein determining whether the MUGI is derived from the MUI of the MU comprises performing a bitwise logical AND of the MUGI and the MUI of the MU.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A rotorcraft comprising:
a means for lift compounding; and
a separate means for propulsion compounding, which is a pneumatic propulsive anti-torque system, comprising:
a tail boom disposed at the aft end of the rotorcraft;
an engine disposed in the tail boom for providing torque through a drive shaft to a rotor system of the rotorcraft;
a fan module disposed in the tail boom and driven by the drive shaft for producing a flow of compressed air through the tail boom;
a thrust nozzle disposed at the end of the tail boom for selectively producing anti-torque thrust and forward thrust;
a duct system disposed within the tail boom for directing the air flow through the tail boom to the thrust nozzle;
adjustable spillage doors disposed near the aft end of the tail boom for selectively releasing excess airflow from within the duct system and for selectively controlling a temperature within the duct system; and
wherein the fan module is located in relation to the engine, such that the compressed air flow from the fan module is mixed with exhaust from the engine to cool the exhaust from the engine a plurality of control vanes disposed at the aft end of the tail boom for selectively controlling the anti-torque thrust and forward thrust, the control vanes being configured to pivot about a vertical axis as well as being pivotally connected to the control vanes located adjacently.
2. The rotorcraft according to claim 1, wherein the thrust nozzle comprises:
a plurality of stationary vertical fins located aft of the control vanes.
3. The rotorcraft according to claim 2, wherein the control vanes articulate between a left-thrust mode in which the control vanes are pivoted relative to the tail boom and to one another so as to direct the air flow from to the left of the tail boom, thereby producing left thrust; a right-thrust mode in which the control vanes are pivoted relative to the tail boom and to one another so as to direct the air flow to the right of the tail boom, thereby producing right thrust; and a forward thrust mode in which the control vanes are aligned longitudinally so as to direct the air flow out the aft end of the tail boom, thereby producing forward thrust.
4. The rotorcraft according to claim 2, wherein the control vanes are configured to produce a reduced exit area, thereby increasing the thrust generated by the fan module.
5. The rotorcraft according to claim 1, wherein the fan module has variable-pitch fan blades.
6. The rotorcraft according to claim 1, wherein the fan module comprises:
inlet guide vanes;
a rotor disk; and
a stator.
7. The rotorcraft according to claim 6, wherein the inlet guide vanes are configured to not rotate, the rotor disk is configured to rotate, and the stator is configured to not rotate.
8. The rotorcraft according to claim 1, further comprising:
a freewheeling clutch disposed between the fan and the drive shaft to allow anti-torque thrust to be provided during autorotation if the engine is shut down in flight.
9. The rotorcraft according to claim 1, wherein the thrust nozzle is a scoop shaped nozzle.
10. The rotorcraft according to claim 1, further comprising:
a freewheeling clutch operably associated with the fan module to allow anti-torque thrust to be provided during autorotation if the engine is shut down in flight.
11. A rotorcraft having an engine for driving a rotor system comprising:
a plurality of wings disposed on the side of the rotorcraft to provide lift compounding; and
a pneumatic propulsive anti-torque system comprising:
a tail boom disposed at the aft end of the rotorcraft;
a fan module disposed in the tail boom and driven by the engine for producing a flow of compressed air through the tail boom;
adjustable spillage doors disposed near the aft end of the tail boom for selectively releasing excess airflow from within the tail boom and for selectively controlling a temperature within the duct system; and
a thrust nozzle disposed at the end of the tail boom for selectively producing anti-torque thrust and forward thrust, wherein the thrust nozzle comprises:
a plurality of articulating control vanes which pivot about an axis that is generally vertical relative to the tail boom and disposed at the aft end of the tail boom for selectively controlling the anti-torque thrust and forward thrust. wherein the control vanes articulate between a left-thrust mode in which the control vanes are pivoted relative to the tail boom and to one another so as to direct the air flow from to the left of the tail boom, thereby producing left thrust; a right-thrust mode in which the control vanes are pivoted relative to the tail boom and to one another so as to direct the air flow to the right of the tail boom, thereby producing right thrust; and a forward thrust mode in which the control vanes are aligned longitudinally so as to direct the air flow out the aft end of the tail boom, thereby producing forward thrust.
12. The rotorcraft according to claim 11, further comprising:
a freewheeling clutch operably associated with the fan to allow anti-torque thrust to be provided during autorotation if the engine is shut down in flight.
13. The rotorcraft according to claim 11, wherein the control vanes are configured to produce a reduced exit area, thereby increasing the thrust generated by the fan module.
14. A rotorcraft, comprising:
a tail boom disposed at the aft end of the rotorcraft;
an engine disposed in the tail boom for providing torque to a rotor system of the rotorcraft;
a fan module disposed in the tail boom and driven by the engine for producing a flow of compressed air through the tail boom;
a thrust nozzle disposed at the end of the tail boom for selectively producing anti-torque thrust and forward thrust; and
a plurality of sets of control vanes configured so that the control vanes within each set are located adjacently in a longitudinal direction, such that adjacent control vanes within each set are pivotally connected to each other;
wherein each control vane within a set of control vanes is configured to pivot on a generally vertical axis; and
wherein the fan module is located in relation to the engine, such that the compressed air flow from the fan module is mixed with exhaust from the engine to cool the exhaust from the engine.
15. The rotorcraft according to claim 14, further comprising:
a freewheeling clutch operably associated with the fan module to allow anti-torque thrust to be provided during autorotation if the engine is shut down in flight.