Uplink coverage via autonomous retransmission
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRui Fan, Xinyu Gu, Rong Hu, Jinhua Liu, Zhang Zhang
Life of this patent
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Abstract
A device (110) receives consecutive negative acknowledgments (NACKs) (540), measures a downlink channel quality (530) associated with the device (110), and triggers autonomous retransmission (430) when power is limited in the device (110), when the device (110) is using a minimum usable enhanced dedicated channel (E-DCH) transport format combination (ETFC), and when one of a number of consecutive NACKs (540) is greater than a predefined number or the measured downlink channel quality (530) is less than a predefined threshold.
Claims14
A device comprising:
- a memory to store a plurality of instructions;
- and
- a processing unit configured to execute instructions in the memory to:
- determine whether power is limited in the device,
- determine whether the device is using a minimum usable enhanced dedicated channel, E-DCH, transport format combination, ETFC,
- receive consecutive negative acknowledgments, NACKs,
- determine whether the number of consecutive NACKs is greater than a predefined number,
- measure a downlink channel quality,
- determine whether the measured downlink channel quality is less than a predefined threshold,
- trigger autonomous retransmission, where a number of retransmissions are sent consecutively without waiting for receipt of a negative acknowledgement before starting the next retransmission, when power is limited in the device, when the device is using the minimum usable ETFC, and when one of:
- the number of consecutive NACKs is greater than the predefined number, and
- the measured downlink channel quality is less than the predefined threshold,
- determine whether a difference between an estimated data signal-to-interference ratio, SIR, associated with a channel and a SIR for a transport format is greater than a certain decibel level, and
- trigger autonomous retransmission when power is limited in the device, when the device is using the minimum usable ETFC, and when the difference is greater than the certain decibel level.
A method, performed by user equipment associated with a wireless environment, the method comprising the steps of:
- receiving consecutive negative acknowledgments, NACKs,
- measuring a downlink channel quality associated with the user equipment,
- triggering autonomous retransmission, where a number of retransmissions are sent consecutively without waiting for receipt of a negative acknowledgement before starting the next retransmission, when power is limited in the user equipment, when the user equipment is using a minimum usable enhanced dedicated channel, E-DCH, transport format combination, ETFC, and when one of:
- a number of consecutive NACKs is greater than a predefined number, or
- the measured downlink channel quality is less than a predefined threshold;
- determining whether a difference between an estimated data signal-to-interference ratio, SIR, associated with a channel and a SIR for a transport format is greater than a certain decibel level, and
- triggering autonomous retransmission when power is limited in the user equipment, when the user equipment is using the minimum usable ETFC, and when the difference is greater than the certain decibel level.
Dependencies are inferred from the claim text.