|author||Pau Espin Pedrol <email@example.com>||2021-07-08 11:00:16 +0200|
|committer||Pau Espin Pedrol <firstname.lastname@example.org>||2021-07-09 10:45:04 +0200|
doc: bts.adoc: Update dyn ts section to include SDCCH8 support
1 files changed, 6 insertions, 5 deletions
diff --git a/doc/manuals/chapters/bts.adoc b/doc/manuals/chapters/bts.adoc
index acd22000c..1a693f9d0 100644
@@ -272,10 +272,11 @@ specification for the detailed meaning of those timers.
=== Dynamic Timeslot Configuration (TCH / PDCH)
-A dynamic timeslot is in principle a voice timeslot (TCH) that is used to serve
-GPRS data (PDCH) when no voice call is active on it. This enhances GPRS
-bandwidth while no voice calls are active, which is dynamically scaled down as
-voice calls need to be served. This is a tremendous improvement in service over
+A dynamic timeslot is in principle a timeslot that is used to serve GPRS data
+(PDCH), but that can be switched to be used either for voice (TCH) or signalling
+(SDCCH8) when all other static timeslots are already in use. This enhances GPRS
+bandwidth while there is no CS load, and is dynamically scaled down as CS
+services need to be served. This is a tremendous improvement in service over
statically assigning a fixed number of timeslots for voice and data.
The causality is as follows: to establish a voice call, the
@@ -313,7 +314,7 @@ a PCU, SGSN and GGSN to provide the actual data service.
==== Osmocom Style Dynamic Timeslots (TCH/F_TCH/H_SDCCH8_PDCH)
Timeslots of the `TCH/F_TCH/H_SDCCH8_PDCH` type dynamically switch between TCH/F,
-TCH/H and PDCH, depending on the channel kind requested by the MSC. The RSL
+TCH/H, SDCCH8 and PDCH, depending on the channel kind requested by the MSC. The RSL
messaging for `TCH/F_TCH/H_SDCCH8_PDCH` timeslots is compatible with Ericsson RBS.
BTS models supporting this timeslot kind are shown in <<dyn_ts_compat>>.