hi,
i like to do
extensions to the RSLms layer of osmocom. before that i like to ask and
discuss if this would be the correct way:
instead directly of
calling l1ctl_* functions of l1ctl.c, i would like to use RSL messages between
layer 2 and layer 3. the lapdm.c would then convert these messages and call
l1ctl_* functions. (maybe i could split up lapdm.c into lapdm.c and layer2.c.
the selecting the handler for an RSL request could be made at
layer2.c, as well as selecting the right handler for the frames received from
layer1. only the lapdm part could be handled in lapdm.c. )
the RACH request
could be sent using RSL_MT_CHAN_RQD, the confirm could be the same message type,
but i prefer to invent a new one: 0x18, but using the same IE layout. also
including RSL_IE_MS_POWER_PARAM with the RACH request, could tell the layer
1 about usage of power and TA (which is normally 0 for RACH
request).
the (UNIT) DATA
request may also include RSL_IE_MS_POWER_PARAMS. if omitted, the stored value
from the last message with RSL_IE_MS_POWER_PARAMS could
used.
the (UNIT) DATA
indication and request of SACCH may include RSL_IE_L1_INFO IE to
receive power and timing control as well as send the actual power and
timing advance. i could handle these IE at layer 3 (radio ressource) and
forward them to layer 1 (RSL_IE_MS_POWER_PARAM) depending on the supported radio
power and on special VTY settings to mess with power and fake timing
advance.
regards,
andreas