Systems, methods and devices for flexible retransmissions
First Claim
1. An enhanced node B (eNB) for cross-carrier retransmission comprising:
- a first wireless transceiver configured for communication over a first set of frequencies;
a second wireless transceiver configured for communication over a second set of frequencies; and
a third wireless transceiver configured for transmissions over a third set of frequencies to the mobile device;
a processor configured to;
send a transmission of data over a secondary component carrier within the first set of frequencies to a mobile device;
receive a message indicating an error receiving the transmission by the mobile device;
determine that the first set of frequencies are occupied by other transmissions; and
send a retransmission of the data over a primary component carrier within the second set of frequenciesreceive a second message indicating a second error receiving the retransmission;
determine that the first set of frequencies and the second set of frequencies are busy; and
send a second retransmission over the third set of frequencies.
3 Assignments
0 Petitions
Accused Products
Abstract
A hybrid automatic repeat request (HARQ) process enables a retransmission to be sent on a carrier (or medium, set of frequencies, band, etc.) different from the carrier on which the previous transmissions (initial transmission and/or retransmissions) were sent. An enhanced HARQ process can improve system performance by aiding user throughput, system throughput, and delay performance by making retransmissions possible even when the unlicensed band is not available (e.g., when occupied by other RATs or the same RAT deployed by another operator). For example, a transmitter sends a subpacket in an unlicensed band. The receiver feeds back a NACK to the transmitter due to the packet decoding failure. If the medium is not idle, the transmitter sends the retransmission in another band or another channel that can be either a licensed band/channel or another unlicensed band/channel. The retransmission can be sent in multiple licensed and/or unlicensed bands/channels at the same time.
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Citations
18 Claims
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1. An enhanced node B (eNB) for cross-carrier retransmission comprising:
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a first wireless transceiver configured for communication over a first set of frequencies; a second wireless transceiver configured for communication over a second set of frequencies; and a third wireless transceiver configured for transmissions over a third set of frequencies to the mobile device; a processor configured to; send a transmission of data over a secondary component carrier within the first set of frequencies to a mobile device; receive a message indicating an error receiving the transmission by the mobile device; determine that the first set of frequencies are occupied by other transmissions; and send a retransmission of the data over a primary component carrier within the second set of frequencies receive a second message indicating a second error receiving the retransmission; determine that the first set of frequencies and the second set of frequencies are busy; and send a second retransmission over the third set of frequencies. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A first base station for cross-carrier retransmission configured to:
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communicate scheduling information for transmission of a subpacket to a user equipment (UE) over a secondary carrier using a second frequency band and a wireless local area network (WLAN) protocol; communicate the scheduling information for transmission of the subpacket to a second base station configured to communicate with the UE over the secondary carrier using the second frequency band and the WLAN protocol; receive a message from the UE indicating an error receiving the subpacket from the second base station; receive a message from the second base station indicating that the second frequency band is occupied with a transmission based at least in part on a WLAN listen before talk (LBT) protocol; determine that the second base station is unable to communicate a retransmission with the UE over the secondary carrier using the second frequency band based at least in part on the second frequency band determined to be in use with the transmission; and send a retransmission of the subpacket to the UE over a primary carrier using a first frequency band. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of retransmission comprising:
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sending data through a first physical downlink shared channel (PDSCH) transmission over a first frequency band to user equipment (UE), the first frequency band shared with another radio access technology; sending a DCI format comprising a first component carrier (CC) indicator for an assigned transmission for a HARQ operation, a second CC indicator where an assigned PDSCH transmission is intended, an indicator of whether data is new or retransmitted, or a HARQ process number; receiving a hybrid automatic repeat request (HARQ) message from the UE over a second frequency band indicating an error in receiving the PDSCH transmission; determining that the first wireless medium is in use with another transmission; and when determined that the first wireless medium is in use with another transmission, sending the data through a second PDSCH transmission over a second frequency band and a third frequency band in parallel. - View Dependent Claims (16, 17, 18)
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Specification