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1. US20170302419 - System and method for SRS switching, transmission, and enhancements

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. A method for reference signal transmission, the method comprising:
receiving, by a user equipment (UE), one or more downlink transmissions over a first set of aggregated component carriers, the UE being capable of transmitting uplink signals over fewer than all component carriers in the first set of aggregated component carriers at the same time; and
transmitting, by the UE, sounding reference signal (SRS) symbols over different component carriers in the first set of aggregated component carriers during different time periods.
2. The method of claim 1, wherein transmitting the SRS symbols over the different component carriers comprises:
receiving, by the UE, a radio resource control (RRC) message from a base station prior to transmitting the one or more SRS symbols over a first component carrier in the set of aggregate component carriers, the RRC message specifying a periodic SRS configuration parameter for transmitting the one or more SRS symbols over the first component carrier; and
periodically transmitting the one or more SRS symbols over the first component carrier during periodic intervals in a sequence of periodic intervals according to the periodic SRS configuration parameter specified by the RRC message.
3. The method of claim 2, wherein the RRC message specifies a period between consecutive intervals in the sequence of periodic intervals.
4. The method of claim 1, further comprising
transmitting, by the UE, an uplink control message indicating uplink carrier aggregation capabilities of the UE.
5. The method of claim 1, further comprising:
receiving a downlink control signal specifying a dual connectivity cell group configuration constraint from a network controller, wherein the dual connectivity cell group configuration constraint both (i) prohibits the UE from switching from a source component carrier in the first set of aggregated component carriers monitored by a first base station to a target component carrier in a second set of aggregated component carriers monitored by a second base station during a set of time periods and (ii) prohibits the UE from switching from a source component carrier in the second set of aggregated component carriers monitored by the second base station to a target component carrier in the first set of aggregated component carriers monitored by the first base station during the set of time periods.
6. The method of claim 5, wherein transmitting the SRS symbols comprises:
transmitting, via a first transmission chain (TX chain) of the UE, at least a first SRS symbol over different component carriers within the first set of aggregated component carriers during different time periods in a set of time period without using the first TX chain to transmit any SRS symbol over component carriers in the second set of aggregated component carriers during any period in the set of time periods; and
transmitting, via a second TX chain of the UE, at least a second SRS symbol over different component carriers within the second set of aggregated component carriers during different time periods in the set of time period without using the second TX chain to transmit any SRS symbol over component carriers in the second set of aggregated component carriers during any period in the set of time periods.
7. A method for reference signal transmission, the method comprising:
receiving, by a user equipment (UE), a downlink control information (DCI) message from a base station, the DCI message specifying a sounding reference signal (SRS) configuration parameter; and
aperiodically transmitting SRS symbols over a first component carrier according to the SRS configuration parameter specified by the DCI message.
8. The method of claim 7, wherein the DCI message is received over a second component carrier that is different than the first component carrier, and wherein reception of the DCI message over the second component carrier triggers cross-carrier transmission of the one or more SRS symbols over the first component carrier.
9. The method of claim 7, wherein the UE receives the DCI message on a primary component carrier of the UE, and wherein the one or more SRS symbols are transmitted over a secondary component carrier of the UE.
10. The method of claim 7, wherein the UE receives the DCI message over a common search space of a physical downlink control channel (PDCCH) of the UE.
11. The method of claim 7, wherein the DCI message has a DCI length that is equal to that associated with DCI format zero.
12. The method of claim 7, wherein the DCI message specifies a transmit power level for the one or more SRS symbols.
13. The method of claim 7, wherein the DCI message triggers the aperiodic transmission of the one or more SRS symbols over the first component carrier.
14. A method for reference signal transmission, the method comprising:
receiving, by a user equipment (UE), a radio resource control (RRC) message from a base station, the RRC message specifying a downlink control information (DCI) message format for signaling an SRS configuration parameter over a physical downlink control channel (PDCCH);
monitoring the PDCCH for a DCI message having the DCI message format specified by the RRC message; and
upon detecting the DCI message in the PDCCH, transmitting one or more SRS symbols over a component carrier according to the SRS configuration parameter signaled by the DCI message.
15. The method of claim 14, wherein the RRC message specifies a specific DCI message format for triggering cross-carrier transmission of an SRS symbol.
16. The method of claim 14, wherein the RRC message specifies a specific DCI message format for indicating an SRS transmit power level.
17. The method of claim 14, wherein the RRC message specifies a specific DCI message format for triggering an aperiodic SRS symbol transmission.
18. A method for reference signal transmission, the method comprising:
receiving, by a user equipment (UE), a radio resource control (RRC) message from a base station, the RRC message specifying orthogonal frequency division multiplexed (OFDM) or single-carrier frequency-division multiple access (SC-FDMA) symbol locations in which sounding reference signal (SRS) symbols are to be transmitted over a component carrier; and
transmitting, by the UE, SRS symbols over the component carrier using the OFDM or SC-FDMA symbol locations specified by the RRC message.
19. An apparatus comprising:
a processor; and
a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive one or more downlink transmissions over a first set of aggregated component carriers, the UE being capable of transmitting uplink signals over fewer than all component carriers in the first set of aggregated component carriers at the same time; and
transmit sounding reference signal (SRS) symbols over different component carriers in the first set of aggregated component carriers during different time periods.
20. A computer program product comprising a non-transitory computer readable storage medium storing programming, the programming including instructions to:
receive one or more downlink transmissions over a first set of aggregated component carriers, the UE being capable of transmitting uplink signals over fewer than all component carriers in the first set of aggregated component carriers at the same time; and
transmit sounding reference signal (SRS) symbols over different component carriers in the first set of aggregated component carriers during different time periods.