diff options
| author | Neels Hofmeyr <neels@hofmeyr.de> | 2017-09-04 03:35:30 +0200 |
|---|---|---|
| committer | Neels Hofmeyr <neels@hofmeyr.de> | 2017-09-06 16:47:47 +0200 |
| commit | 1e52928ad9e87f2db0a9abe0ba37d2c9c2629463 (patch) | |
| tree | 21581a95387fb508d5ac12bfb62fb572be4aaffc /doc/paging.txt | |
| parent | 075cac02b0e346e1fdb1176f7434a900999ec6f5 (diff) | |
drop files unrelated to osmo-sgsn
These either remain from openbsc.git or slipped in while applying recent
patches from openbsc.git and do not belong in osmo-sgsn.
Change-Id: Ie9dc7514c3850010d0e9b3ab716b4f4e8d83594f
Diffstat (limited to 'doc/paging.txt')
| -rw-r--r-- | doc/paging.txt | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/doc/paging.txt b/doc/paging.txt deleted file mode 100644 index c597c22b4..000000000 --- a/doc/paging.txt +++ /dev/null @@ -1,48 +0,0 @@ - -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. |