A method for detecting loss of synchronism in an idle state and terminal device
An idle state and terminal equipment technology, applied in the communication field, can solve problems such as large time granularity, insufficient timely and reliable out-of-synchronization judgment, and inability to return to normal standby as soon as possible.
Active Publication Date: 2015-05-13
LEADCORE TECH
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However, for a terminal in the idle state, the time granularity for the terminal to receive downlink data is very large. For example, the default paging cycle can be: 320 milliseconds, 64 milliseconds, 128 milliseconds, 256 milliseconds, etc. If the idle state is judged according to the above criteria In the case of out-of-synchronization of LTE terminals, because the reference source for judgment, that is, the downlink control channel PDCCH and PCFICH, the downlink received data is too small, which will lead to insufficient timely and reliable judgment of out-of-sync in the idle state, resulting in the inability to perform cell re-search in time Problems returning to normal standby
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[0052] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.
[0053] The out-of-synchronization detection method and terminal equipment in the idle state of the embodiment of the present invention aim at the characteristic that the time granularity of receiving downlink data by the terminal in the idle state is large, so that the existing technology only judges the terminal according to the block error rate of the downlink control channels PDCCH and PCFICH Whether it is out of sync, which leads to the problem that the judgment of the terminal is not timely and reliable in the idle state. Detect different out-of-sync reference sources, and calculate the out-of-sync degree according to the detection results. If the step degree exceeds a predetermined value, it is determined t...
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The invention relates to communication technology and discloses a method and terminal device for detecting loss of synchronism in an idle state. The method comprises determining the reference source of loss of synchronism which includes the block error ratio of a control channel, and any one or two of the block error ratio of a data-sharing channel undertaking paging and the signal to noise ratio of a wireless channel, detecting the reference source of loss of synchronism to obtain the detection result by which the extent of the loss of synchronism is computed, ensuring the loss of synchronism when the obtained extent of the loss of synchronism computed in a set cycle exceeds a set value in an idle state. It is possible to timely and reliably detect the loss of synchronism of the terminal device in an idle state by using the method.
Description
technical field [0001] The present invention relates to the technical field of communications, and more specifically, to a method for detecting out-of-synchronization in an idle state and a terminal device. Background technique [0002] Currently, the 3GPP (3rd Generation Partnership Project, 3rd Generation Mobile Communication Standardization Partnership Project) protocol clearly defines the threshold Qout for the physical layer of an LTE (Long Term Evolution, Long Term Evolution) terminal to determine that it is out of synchronization in a connected state. The out-of-synchronization threshold Qout is defined as an assumed existing control channel PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel) and PCFICH (Physical Control Format Indicator Channel, Physical Control Format Indicator Channel) with a block error rate of 10%. If the terminal evaluates that the link quality is lower than Qout within the out-of-synchronization evaluation period (for e...
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IPC IPC(8): H04L1/00
Inventor 陆迎光
Owner LEADCORE TECH