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Adaptive random access channel retransmission

A random access and self-adaptive technology, applied in transmission monitoring, transmission system, wireless communication, etc., can solve problems such as loss of connection opportunities

Active Publication Date: 2014-05-07
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early termination of requested communication under certain observation conditions can be used to save battery power in mobile devices, but may also result in loss of connection opportunities

Method used

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  • Adaptive random access channel retransmission
  • Adaptive random access channel retransmission
  • Adaptive random access channel retransmission

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Embodiment Construction

[0017] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the underlying concepts underlying the described embodiments. It will be apparent, however, to one skilled in the art that the described embodiments may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order not to unnecessarily obscure basic concepts.

[0018] The examples and embodiments provided below describe methods for adjusting the power level and repetition of transmissions from a mobile wireless device to a wireless network, and in particular adjusting uplink transmissions to a random access network based on measured downlink channel conditions. Various methods and apparatus for power level and repetition of random access channel preamble transmissions. In one embodiment, the uplink random access channel preamble transmission is sent using the W-CDMA UM...

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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.

Description

[0001] priority application [0002] This application claims priority to co-pending U.S. Patent Application No. 13 / 555,083, filed July 21, 2012, and entitled "ADAPTIVE RANDOM ACCESS CHANNEL RETRANSMISSION," which claims U.S. Provisional Patent Application No. , filed Aug. 5, 2011 61 / 515,725, which application is hereby incorporated by reference in its entirety for all purposes. technical field [0003] The described embodiments relate generally to methods and devices for adjusting the power level of transmissions from mobile wireless devices. More particularly, the present embodiments describe methods and apparatus for a mobile wireless device to adjust the power level and repetition for uplink random access channel preamble transmissions based on downlink channel conditions. Background technique [0004] Mobile devices in wireless networks balance communication capabilities with limited power consumption, especially in smaller form factors that offer advanced features such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W52/146H04W52/367H04W52/48H04W52/50H04W52/241H04B17/318H04W52/18H04W74/08
Inventor 宋基逢王晓文S·A·姆塔巴
Owner APPLE INC
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