Method and apparatus for operating in a discontinuous reception mode employing carrier aggregation

• US 10,172,087 B2
• Filed: 02/17/2017
• Issued: 01/01/2019
• Est. Priority Date: 06/18/2009
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Marinier, Paul, Terry, Stephen E., Gauvreau, Jean-Louis
• Primary Examiner(s): Shah, Chirag G
• Assistant Examiner(s): Reddivalam, Srinivasa R
• Application Number:
  US15/435,943
• Publication Number:
  US 20170164421A1
• Time in Patent Office: 683 Days
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods and apparatus are described. A long term evolution-advanced (LTE-A) wireless transmit/receive unit (WTRU) includes a transceiver and a processor. The transceiver receives discontinuous reception (DRX) configuration information. The processor, in response to the received DRX information, controls the transceiver to monitor LTE-A physical downlink control channels (PDCCHs) in subframes in a first frequency band during an active time. The processor further, in response to detecting a downlink assignment in an LTE-A PDCCH in the first frequency band during the active time, wherein the downlink assignment indicates a second frequency band and assigned subcarriers within the second frequency band, to receive an LTE-A physical downlink shared channel (PDSCH) K subframes after a transmission of the downlink assignment. The second frequency band is different than the first frequency band.

Claims

1. A long term evolution-advanced (LTE-A) wireless transmit/receive unit (WTRU), the LTE-A WTRU comprising:

a transceiver configured to receive discontinuous reception (DRX) configuration information;

a processor operatively coupled to the transceiver, the processor and transceiver, in response to the received DRX configuration information, configured to monitor one or more LTE-A physical downlink control channels (PDCCHs) in subframes in a first frequency band during an active time; and

the processor and transceiver, in response to detecting a downlink assignment transmission in the LTE-A PDCCHs in the first frequency band during the active time, are further configured to receive an LTE-A physical downlink shared channel (PDSCH) on assigned subcarriers at a second frequency band indicated by the downlink assignment transmission,

wherein the LTE-A PDSCH is received K subframes after an end of the downlink assignment transmission,

wherein a round trip time (RTT) of a HARQ of the LTE-A PDSCH is increased by K subframes,

wherein K is equal to at least 2, and

wherein the second frequency band is different than the first frequency band.

2. The LTE-A WTRU of claim 1, wherein the K subframes allows for PDCCH processing time and activation for the second frequency band.

3. The LTE-A WTRU of claim 1, wherein the processor and transceiver are further configured to, in response to detecting a second downlink assignment transmission in the LTE-A PDCCHs during the active time, receive the LTE-A physical downlink shared channel (PDSCH) 2 subframes after an end of the second downlink assignment transmission.

4. A method implemented by a long term evolution-advanced (LTE-A) wireless transmit/receive unit (WTRU), the method comprising:

receiving, by the LTE-A WTRU, discontinuous reception (DRX) configuration information;

in response to the received DRX configuration information, monitoring, by the LTE-A WTRU, one or more LTE-A physical downlink control channels (PDCCHs) in subframes in a first frequency band during an active time; and

in response to detecting a downlink assignment transmission in the LTE-A PDCCHs in the first frequency band during the active time, is further configured to receive an LTE-A physical downlink shared channel (PDSCH) on assigned subcarriers at a second frequency band indicated by the downlink assignment transmission,

wherein the LTE-A PDSCH is received K subframes after an end of the downlink assignment transmission,

wherein a round trip time (RTT) of a HARQ of the PDSCH is increased by K subframes,

wherein K is equal to at least 2, and

wherein the second frequency band is different than the first frequency band.

5. The method of claim 4, wherein the K subframes allows for PDCCH processing time and activation for the second frequency band by the LTE-A WTRU.

6. The method of claim 4, further comprising in response to detecting a second downlink assignment transmission in an LTE-A PDCCH during the active time, receiving an LTE-A physical downlink shared channel (PDSCH) K subframes after a transmission of the second downlink assignment transmission.

7. A long term evolution-advanced (LTE-A) eNodeB, the LTE-A eNodeB comprising:

a processor operatively coupled to a transceiver, the processor and transceiver configured to transmit discontinuous reception (DRX) configuration information to an LTE-A wireless transmit/receive unit (WTRU);

the processor and transceiver are further configured to transmit an LTE-A physical downlink control channel (PDCCH) in at least one subframe in an active time in a first frequency band having a downlink assignment for the LTE-A WTRU, wherein the active time is based on the DRX configuration information, wherein the downlink assignment indicates a second frequency band and assigned subcarriers within the second frequency band; and

the processor and transceiver are further configured to transmit an LTE-A physical downlink shared channel (PDSCH) on the assigned subcarriers at the second frequency band indicated by the downlink assignment,

wherein the LTE-A PDSCH is received K subframes after an end of transmission of the downlink assignment,

wherein a round trip time (RTT) of a HARQ of the PDSCH is increased by K subframes,

wherein K is equal to at least 2, and

wherein the second frequency band is different than the first frequency band.

8. The LTE-A eNodeB of claim 7, wherein the K subframes allows for PDCCH processing time and activation for the second frequency band by the LTE-A WTRU.

9. The LTE-A eNodeB of claim 7, wherein the processor and transceiver is further configured to transmit the LTE-A physical downlink control channel (PDCCH) in at least one subframe in an active time in the first frequency band having a second downlink assignment for the LTE-A WTRU, and transmit an LTE-A PDSCH K subframes after transmission of the second downlink assignment.