SIB8/SIB16(1)

weixin_41980145

于 2020-07-11 15:36:21 发布

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文章标签： AGPS

本文链接：https://blog.youkuaiyun.com/weixin_41980145/article/details/107285715

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本文深入解析了LTE系统中SIB8和SIB16的作用与特性。SIB8作为3GPP2网络的强制要求，包含支持1xCSFB所需的时间和其他基站相关信息，其准确性至关重要。而SIB16则为可选项，提供GNSS和UTC时间信息，尽管可能因错误配置而不准确，但不影响LTE功能。文章还提到了Qualcomm调制解调器如何利用这些信息加速GNSS定位。

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SIB8/SIB16
1 LTE Networks can transmit absolute GPS Time using OTA Messages (SIB8 and/or SIB16)

  And here is more information about LTE SIB8 and SIB16 from time information point of view.

LTE SIB8:
• Mandatory for all 3GPP2 Networks and is widely deployed in 3GPP2 Networks.
• Has time and other base station related information required to support 1x CSFB.
• Always accurate and reliable because otherwise it will affect 1x CSFB functionality.

LTE SIB16:
• Optional for both 3GPP and 3GPP2 NWs and is not deployed in most networks.
• Has only GNSS and UTC time information.
• Could be incorrect because of wrong provisioning but will not affect any LTE functionality and hence may be undetected.

LTE SW in Qualcomm modems can transfer LTE SIB8/16 time to GNSS engine for faster GNSS time to fix.

This process is called as LTE Time transfer (TTr).

From GPS perspective, we receives time info. from network, and 8917+wtr2965 support SIB8 and SIB16 GPS time sync.