Uplink sounding reference signal (SRS) transmission in carrier aggregation system
AssigneeApple Inc.
InventorsHong He, Gang Xiong, Seunghee Han, Hwan-Joon Kwon, Alexei Davydov
Life of this patent
Estimating the term…
Abstract
An apparatus can receive or transmit parameters for a sounding reference signal (SRS) transmission configuration as an uplink (UL)/downlink (DL) configuration of a serving cell. A time division duplex (TDD) operation with a plurality of component carriers (CCs) can be enabled/generated based on the parameters and at least one component carriers being reserved for the UL transmission or having a higher priority than a physical channel transmission such as a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission.
Claims23
A non-transitory computer-readable storage medium storing executable instructions that, in response to execution, cause a user equipment (UE) device to perform operations comprising:
- receiving one or more sounding reference signal (SRS) transmission configuration parameters, including a parameter to for an SRS transmission by an SRS carrier switching operation;
- configuring a first component carrier (CC) among a plurality of CCs for the SRS transmission, wherein the first CC is configured without a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission, and wherein an uplink (UL)/downlink (DL) configuration for the first CC of the UE is provided by a hybrid automatic repeat (HARQ) configuration parameter configured for the UE;
- and
- determining whether to transmit or drop the SRS transmission by using the first CC, and using at least one of:
- a first orthogonal frequency-division multiplexing (OFDM) symbol, or a last OFDM symbol, in a subframe in the first CC, wherein the SRS transmission is dropped in response to determining that the first OFDM symbol collides with the PUSCH transmission or the PUCCH transmission in a second CC that is configured with the PUSCH transmission or the PUCCH transmission;
- and
- configuring or counting one or more resource elements of the first OFDM symbol or the last OFDM symbol of the subframe to be counted in a PUSCH mapping, but not used for transmission of the PUSCH transmission in the second CC.
A non-transitory computer-readable storage medium storing executable instructions that, in response to execution, cause one or more processors of an evolved NodeB (eNB) to perform operations comprising:
- providing one or more parameters based on a sounding reference signal (SRS) transmission configuration comprising a first component carrier (CC) and a second CC configured to enable an SRS transmission according to an SRS carrier switching operation, wherein the second CC is configured to enable the SRS transmission without a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission;
- providing an uplink (UL)/downlink (DL) configuration for the second CC of a user equipment (UE) by a hybrid automatic repeat request (HARQ) configuration parameter;
- receiving the SRS transmission based on the SRS carrier switching operation and at least one of:
- a first orthogonal frequency-division multiplexing (OFDM) symbol or a last OFDM symbol in a subframe colliding with an SRS CC-based switching time of the SRS transmissions;
- configuring or counting one or more resource elements of the first OFDM symbol or the last OFDM symbol of the subframe in a PUSCH mapping and not in the PUSCH transmission in the second CC.
An apparatus employed in a user equipment (UE) device, comprising:
- one or more processors configured to:
- receive one or more parameters of an uplink (UL)/downlink (DL) configuration of a serving cell, wherein the UL/DL configuration of the UE is provided by a hybrid automatic repeat request (HARQ) configuration parameter configured for the UE;
- and
- generate a time division duplex (TDD) operation with component carriers to communicate an SRS transmission by an SRS carrier switching operation based on the one or more parameters of the UL/DL configuration and reserving at least one component carrier of the component carriers for the SRS transmission from interference from at least one of:
- a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission;
- generate an SRS carrier switching operation based on a determination of at least one of:
- a first orthogonal frequency-division multiplexing (OFDM) symbol or a last OFDM symbol in a subframe colliding with an SRS CC-based switching time of the SRS transmission;
- generate a PUSCH mapping in response to one or more resource elements of the first OFDM symbol or the last OFDM symbol of the subframe colliding with an SRS CC-based switching time of the SRS transmission, and without utilizing the one or more resource elements for the PUSCH transmission;
- and
- a radio frequency interface configured to communicate the SRS transmission.
Dependencies are inferred from the claim text.