> For the complete documentation index, see [llms.txt](https://gsm.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gsm.learn-telecom.com/system-information-messages/system-information-3-si3.md).

# System information-3 (SI3)

Carry following : 1. LAI of the current location area, 2. Cell identity, 3. Control channel information required to calculate paging group, 4. Cell options to achieve good performance in the cell, 5.

![](https://1516040574-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg081KOVSE5kjkOj8LvCP%2Fuploads%2FICyptpuEEjQp3U1FXkjf%2Fimage.png?alt=media\&token=96732c1d-1a14-4af0-a7cb-727ec1d33f6d)

![System information-3 (SI3)](https://1516040574-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg081KOVSE5kjkOj8LvCP%2Fuploads%2FkJM2FBWjE5jhaYTEW8Wb%2Fimage.png?alt=media\&token=982dd524-5a00-466b-9848-3d5376abf361)