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[ENB] No SIB7 support for broadcasting GERAN neighbors #357
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laf0rge
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Aug 4, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. Closes: srsran#357
The configuration snipped for SIB7 currently looks like this:
I haven't yet figured out how to add a "further ARFCNs" list using the srsLTE config file parser, but I'm sure it's not hard. |
laf0rge
added a commit
to laf0rge/srsLTE
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Aug 4, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. Closes: srsran#357
laf0rge
added a commit
to laf0rge/srsLTE
that referenced
this issue
Aug 4, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. An example SIB7 section looks as follows: sib7 = { t_resel_geran = 1; carrier_freqs_info_list = ( { cell_resel_prio = 0; ncc_permitted = 255; q_rx_lev_min = 0; thresh_x_high = 7; thresh_x_low = 7; start_arfcn = 871; band_ind = "dcs1800"; explicit_list_of_arfcns = ( 873, 875, 877 ); } ); }; Closes: srsran#357
laf0rge
added a commit
to laf0rge/srsLTE
that referenced
this issue
Aug 4, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. An example SIB7 section looks as follows: sib7 = { t_resel_geran = 1; carrier_freqs_info_list = ( { cell_resel_prio = 0; ncc_permitted = 255; q_rx_lev_min = 0; thresh_x_high = 7; thresh_x_low = 7; start_arfcn = 871; band_ind = "dcs1800"; explicit_list_of_arfcns = ( 873, 875, 877 ); } ); }; Closes: srsran#357
laf0rge
added a commit
to laf0rge/srsLTE
that referenced
this issue
Aug 6, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. An example SIB7 section looks as follows: sib7 = { t_resel_geran = 1; carrier_freqs_info_list = ( { cell_resel_prio = 0; ncc_permitted = 255; q_rx_lev_min = 0; thresh_x_high = 7; thresh_x_low = 7; start_arfcn = 871; band_ind = "dcs1800"; explicit_list_of_arfcns = ( 873, 875, 877 ); } ); }; Closes: srsran#357
andrepuschmann
pushed a commit
that referenced
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Aug 27, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. An example SIB7 section looks as follows: sib7 = { t_resel_geran = 1; carrier_freqs_info_list = ( { cell_resel_prio = 0; ncc_permitted = 255; q_rx_lev_min = 0; thresh_x_high = 7; thresh_x_low = 7; start_arfcn = 871; band_ind = "dcs1800"; explicit_list_of_arfcns = ( 873, 875, 877 ); } ); }; Closes: #357
andrepuschmann
pushed a commit
that referenced
this issue
Oct 14, 2019
This adds the required missing bits to the eNB config file parser to enable minimalistic support of parsing SIB7 configuration. SIB7 contains GERAN (GSM) neighbor cell information, which is important if you are operating a combined 2G+4G netowrk and want to assist the UEs to reselect GSM cells once they move out of LTE coverage. An example SIB7 section looks as follows: sib7 = { t_resel_geran = 1; carrier_freqs_info_list = ( { cell_resel_prio = 0; ncc_permitted = 255; q_rx_lev_min = 0; thresh_x_high = 7; thresh_x_low = 7; start_arfcn = 871; band_ind = "dcs1800"; explicit_list_of_arfcns = ( 873, 875, 877 ); } ); }; Closes: #357
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In any network that involves generations/technology, one typically needs to advertise so-called Inter-RAT neighbor cells. So in GSM, we broadcast UMTS + LTE neighbors, and subsequently in LTE, one needs to broadcast GSM and UMTS neighbors. This is required for proper idle mode cell reselection to work, if (what's always the case in reality) your network coverage of different technologies is not identical, e.g. LTE smaller than GSM or vice versa.
In LTE this is done in SIB6 (UTRAN) and SIB7 (GERAN) or even SIB8 (CDMA2000).
srsENB currently lacks the functionality to configure + broadcast any of those neighbors.
I'm currently playing with the code to add support for SIB7 and am opening this ticket to track progress on this feature.
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