Adaptive random access channel retransmission
First Claim
1. A method of adapting transmit power levels and repetitions of transmissions from a mobile wireless device to a wireless network, the method comprising:
- at the mobile wireless device;
measuring a downlink signal power level and a downlink signal quality received from a radio access subsystem in the wireless network;
receiving one or more transmit parameters from the radio access subsystem;
calculating an initial transmit power level for an uplink preamble based on the received transmit parameters and on the measured downlink signal power level;
transmitting a series of preambles to the radio access subsystem, each successive preamble having an increasing transmit power level up to and not exceeding a maximum transmit power level, and a number of retransmissions not exceeding a maximum retransmission count;
stop transmitting the preamble retransmissions after receiving an ACK or NACK response from the radio access subsystem;
when the transmit power level of the preamble equals or exceeds the maximum transmit power level and the measured downlink signal quality falls below a pre-determined threshold, limiting the number of preamble retransmissions to less than the maximum retransmission count; and
when the measured downlink signal quality falls below the pre-determined threshold, calculating a minimum number of preamble retransmissions that is less than the maximum number of retransmission count allowed by the wireless network but larger than zero, wherein the minimum number of preamble retransmissions depends on an excess amount between a computed preamble transmit power level and the maximum transmit power level, wherein a higher excess amount decreases the minimum number of preamble retransmissions.
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Accused Products
Abstract
A mobile wireless device adapts transmit power levels and number of retransmissions of a preamble sent to a wireless network. The mobile wireless device measures characteristics of a downlink signal received from the wireless network. The mobile wireless device transmits a series of preambles to the wireless network, each successive preamble having an increased power level, starting at a power level based on the measured received signal characteristics and on parameters received from the wireless network, up to a maximum transmit power level. When the transmit power level of the preamble exceeds the maximum transmit power level and when the measured downlink signal quality falls below a threshold, the mobile wireless device limits the number of preamble retransmission to less than an allowed maximum number of retransmissions. A minimum number of retransmissions is determined and adapted to higher values for larger measured values of downlink signal quality.
29 Citations
17 Claims
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1. A method of adapting transmit power levels and repetitions of transmissions from a mobile wireless device to a wireless network, the method comprising:
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at the mobile wireless device; measuring a downlink signal power level and a downlink signal quality received from a radio access subsystem in the wireless network; receiving one or more transmit parameters from the radio access subsystem; calculating an initial transmit power level for an uplink preamble based on the received transmit parameters and on the measured downlink signal power level; transmitting a series of preambles to the radio access subsystem, each successive preamble having an increasing transmit power level up to and not exceeding a maximum transmit power level, and a number of retransmissions not exceeding a maximum retransmission count; stop transmitting the preamble retransmissions after receiving an ACK or NACK response from the radio access subsystem; when the transmit power level of the preamble equals or exceeds the maximum transmit power level and the measured downlink signal quality falls below a pre-determined threshold, limiting the number of preamble retransmissions to less than the maximum retransmission count; and when the measured downlink signal quality falls below the pre-determined threshold, calculating a minimum number of preamble retransmissions that is less than the maximum number of retransmission count allowed by the wireless network but larger than zero, wherein the minimum number of preamble retransmissions depends on an excess amount between a computed preamble transmit power level and the maximum transmit power level, wherein a higher excess amount decreases the minimum number of preamble retransmissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A mobile wireless device comprising:
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an application processor configured to manage connections between the mobile wireless device and a wireless network; and a transceiver configured to; measure a downlink signal power level and a downlink signal quality for a downlink signal received from a radio access subsystem in the wireless network; transmit a series of preambles to the radio access subsystem, each successive preamble having an increasing transmit power level and not exceeding a maximum transmit power level; and limit the number of preamble retransmissions based on the measured downlink signal quality to a minimum number of retransmissions greater than zero and less than a maximum number of retransmissions when the transmit power level equals or exceeds the maximum transmit power level, wherein the minimum number of retransmissions further depends on an excess amount between a computed preamble transmit power level and the maximum transmit power level, wherein a higher excess amount decreases the minimum number of retransmissions. - View Dependent Claims (15, 16, 17)
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Specification