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-GSM Paging implementation in OpenBSC
-== Code structure ==
-The code is implemented in the libbsc/paging.c file. The external
-interface is documented/specified in the include/openbsc/paging.h
-header file. The code is used by the NITB and BSC application.
-== Implementation ==
-Paging can be initiated in two ways. The standard way is to page by
-LAC. Each BTS has its own list/queue of outstanding paging operation.
-When a subscriber is paged one "struct paging_request" per BTS will
-be allocated and added to the tail of the list. The BTS is supposed
-to be configured to not repeat the paging.
-A paging_request will remain in the queue until a paging response or at
-the expiry of the T3113. Every 500 milliseconds a RSL paging command is
-send to the BTS. The 500 milliseconds is a throttling to not crash the
-ip.access nanoBTS. Once one paging_request has been handled it will be
-put at the end of the queue/list and the available slots for the BTS
-will be decreased.
-The available slots will be updated based on the paging load information
-element of the CCCH Load indication. If no paging slots are considered
-to be available and no load indication is sent a timer is started. The
-current timeout is 500 milliseconds and at the expiry of the timer the
-available slots will be set to 20.
-OpenBSC has the " paging free <-1-1024>" configuration option. In case
-there are less free channels than required no paging request will be
-sent to the BTS. Instead it will be attempted to send the paging request
-at the next timeout (500 milliseconds).
-== Limitation ==
-The paging throughput could be higher but this has lead to crashes on the
-ip.access nanoBTS in the past.
-== Configuration ==
-=== ip.access nanoBTS ===
-The current CCCH Load indication threshold is 10% and the period is 1 second.
-The code can be found inside the src/libbsc/bts_ipaccess_nanobts.c inside the
-nanobts_attr_bts array.