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US 8,413,003 B2Granted
Uplink coverage via autonomous retransmission
AssigneeTelefonaktiebolaget L M 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.
Claims18
A device comprising:
- a memory to store a plurality of instructions;
- and
- a processing unit 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, and
- 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, or the measured downlink channel quality is less than the predefined threshold,
- the processing unit further adapted to execute instructions in the memory to:
- receive, from another device, a number of retransmissions for the autonomous retransmission, where the other device determines a signal-to-interference ratio required for a transport format (SIRREQ), measures a SIR (SIRMEAS) associated with the other device, and calculates the number of retransmissions based on the SIRREQ and the SIRMEAS.
10 more elements
A method, performed by user equipment associated with a wireless environment, the method comprising:
- 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;
- and
- receiving, from a base station, a number of retransmissions for the autonomous retransmission, where the base station determines a signal-to-interference ratio required for a transport format (SIRREQ), measures a SIR (SIRMEAS) associated with the base station, and calculates the number of retransmissions based on the SIRREQ and the SIRMEAS.
3 more elements
A system comprising:
- a first device to:
- receive consecutive negative acknowledgments (NACKs),
- measure a downlink channel quality, and
- 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 first device, when the first device 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;
- and
- a second device to:
- determine a signal-to-interference ratio required for a transport format (SIRREQ),
- measure a SIR (SIRMEAS) associated with the second device,
- calculate a number of retransmissions for the autonomous retransmission based on the SIRREQ and the SIRMEAS, and
- provide the number of retransmissions to the first device to be used by the first device when determining to trigger autonomous retransmission.
8 more elements
Dependencies are inferred from the claim text.