CALL ESTABLISHMENT (TO LAND)
MS L1 ABIS RRSM CRM SM SSM MTP/MSCRACH channal
T3120 request ok_acc_proc_suc_rach (could be decoded) access_per_rach (all received)
channelrequest inv_est_cause_on_rach(included phantom)
channelAGCH immediate assign. request chan_req_cause_atmpt (1510)
"123 tone" reject channelT3126 start T3122 required received
expire T3122channal channelrequest assigned alloc_sdcch
busy_sdcchRSS
channel activation
channel activetionacknowledge
immediate assignmentAGCH immediate command start T3101
assignment access_per_agch (how many im_assign_cmd/rej was sent out, 1 msg may include upto 2 MS)
expire T3101 chan_req_ms_fail
SDCCH L2 SABM estabish indictionT3230 L3 (intial msg) CM service request stop T3101T303 UA ok_acc_proc
(SDCCH) ms_access_by_type (1510) initial L3 information CM Service request <CR>
immediate assignment reject conn_req_to_mscalloc_sdcch_fail
chan_req_ms_blk SCCP connclassmark3(if needed)
<CC>
<CREF> conn_refused
SDCCH setupidentity request (if MSC need more MS information)identity response call setupcall proceeding (MSC have got enough information to setup the connection)
T310 facility (if MS have some supplementary services, such as call divert)
assignmentrequest start MSC timer for
ma_req_from_msc assignment, =30s initiate assignment
start assign_successfulassignment resource expire MSC timer without
request UDT(reset circuit) assignment complete' orresouce not available assignment failure'
alloc_tch_fail expire assign_successful ma_cmd_to_ms_blkd assignment failure
unsuccessful assignmentassignment failure
force queue start T11assignment queued
queuing indication expire T11 release request
clear requestassignment channel clr_req_to_msc
assigned stop T11alloc_tch
physical context request tch_usage ….physical context confirmed busy_tchchannel activationchannel activation ack.
SDCCH assignment command start T10ma_cmd_to_ms expire T10 release request clear request
assignment failure ma_fail_from_ms stop T10 release request clear request
FACCH L2 SABMUA
assignment completed stop T10
assignment successful stop assign_successful PSTN
connectionrequired
connection responsesuccess assignment complete
stop MSC timer for total_call assignmentma_complete_to_msc(total call+intracellHO) IFAM (initial and final address)
ACM (address complete)alerting
connectconn ack. T313 billing start billing
maybe efr_req_from_msc
total_call and alloc_tch counter works before alerting signal was sent. For drive test, the drop call should be considered after this point.
Only at this time, the MSC begain to send the called address to PSTN
BSCBTS
MS RSS(s) RRSM(s) SSM SM MTP
ho_rec
ho_rec receivedOUT_INTRA_BSS_HO_REQsource cell (when SSM decidesintra bss is best)
CRM(t) internal ho request
IN-(pegged for target)OUT-(pegged for source)NC-per neighbor
handover resource not availble OUT_INTRA_BSS_HO_PRI_BLK
HO_FAIL_NO_RESOURCES ALLOC_TCH_FAIL
RRSM(t) ho_channel assigned
RSS(t) channel act Alloc_TCH
channel act ack
ms pwr control
handover allocation start ho_complete IN_INTRA_BSS_NC_ATMPT
RRSM(s) initiate handoverRSS(s) OUT_INTRA_BSS_HO_ATMPT rr_t3103
ho_cmd start T8 OUT_HO_NC_CAUSE_ATMPTOUT_HO_CAUSE_ATMPT
ho_cmd(RN) INTERBAND_ACTIVITY<FACCH>
ho failure
unsuccessful handover INTERBAND_ACTIVITY
RSS(t) OUT_INTRA_BSS_HO_RETURNOUT_INTRA_BSS_EQUIP_FAIL
ho_access IN_INTRA_BSS_HO_RETURN<FACCH> IN_INTRA_BSS_EQUIP_FAIL
synchronizedho_access handover
(only 4 times)ho_access
ho_access BAD_HO_REFNUM_MS
RRSM(t)ho_detection
ho_detect receivedSM
phys info (in non-synch ho; TA calculation) trans req
sabmestablish switch respindication
UA
ho_cmplt
ho_cmplt
BSCBTS(s) MS
stop ho_complete MTPho_succ
ho_performed
IN_INTRA_BSS_HO_SUCOUT_INTRA_BSS_HO_SUCIN_INTRA_BSS_NC_SUCOUT_HO_NC_SUCINTRA_BSS_HO_CAUSE_SUC
Handover Blocked
RRSM(s) SSMho_rec received
CRM(t)internal ho request
ho resource not available OUT_INTRA_BSS_HO_PRI_BLK
HO_FAIL_NO_RESOURCES ALLOC_TCH_FAIL
Handover Failure
MS RRSM(s) SSM
initiate ho
ho command start T8 rr_t3103
ho failure stop T8
unsuccessfulho INTERBAND_ACTIVITY
OUT_INTRA_BSS_HO_RETURNOUT_INTRA_BSS_EQUIP_FAILIN_INTRA_BSS_HO_RETURNIN_INTRA_BSS_EQUIP_FAIL
Mobile Lost
MS RSS(t) RRSM(t) SSM
channeol actacknowledge
ho allocation
HO_COMPLETE
RRSM(s) initiate ho
T8 rr_3103
RRSM(t) Expired
Radio Channel Released
RRSM(s)
Expired Radio Channel Released
Expired
clear request
OUT_INTRA_BSS_HO_LOSTMSCLR_REQ_TO_MSC
Bad Handover Reference Number
RRSM(t) CRM(t) SSMinternal ho request
ho channelassigned
handover allocation
RRSM(s) initiate handover
RSS(s)ho_cmd
MSho_cmd
( include a RN)
Channel Coder
handover access burst
RSS(t) L1
handover
access BAD_HO_REFNUM_MS( compare RN received now and sent before)
CHANNEL ACT
Successful Inter BSS Handover Sequence
MS RSS(s) RRSM(s) SSM(s) MSC
ho_recho_rec
received ho_required OUT_INTER_BSS_REQ_TO_MSC
SSM(t) <cc>ho request
CRM(t)RRSM(t) ho request HO_REQ_FROM_MSC
handover resource not availble
HO_FAIL_NO_RESOURCESRSS(t) ALLOC_TCH_FAIL
assignedchannel act Alloc_TCH
channel act
acknowledge handover allocation
start ho_complete SMconnreq
switch resp
<cc> ho Req HO_REQ_MSC_OK acknowledge
start ho_successful
SSM(s)handover cmd
RRSM(s) initiate ho OUT_INTER_BSS_HO_ATMPT
handover cmd OUT_HO_NC_CAUSE_ATMPTOUT_HO_CAUSE_ATMPT
start T8
RSS(t) ho access (facch)
RRSM(t)
SSM(t)ho_detect
phys info ho_detectreceived
SAMB ho_detectestablish ind
ho_cmplt stop ho_complete
ho_successful IN_INTER_BSS_HO_SUC
ho_cmplt stop ho_successful
SSM(t) clear cmd
OUT_INTER_BSS_HO_SUCOUT_HO_NC_SUC
stop T8
Handover Failure (target)
MSC SSM(t)
<CR> handover request
<CREF> handover failure HO_REQ_MSC_FAIL
Handover Failure (source)
MS RRSM(s) SSM(s) MSChandove command
initiate handover
ho command start T8
handoverfailure stop T8
unsuccessfulhandover handover failure
OUT_INTER_BSS_HO_RETURNOUT_INTER_BSS_EQUIP_FAIL HO_REQ_MSC_FAIL
MS BSS MSC VLR HLR PSTN1 CHANNEL REQUEST RACH
IMMEDIATE ASSIGNMENT AGCH(SDCCH)SIGNALLING LINK ESTABLISH SDCCH
2 REQUEST FOR SERVICE CR(cm service requist, classmark..)
CC SUBSCRIBER(cm service requist ack.) SUBSCRIBER DETAILS
DETAILS IF NECESSARY3 AUTHENTICATION
SET CIPHER MODE
4 SET UP SDCCHcall info
5 EQUIPMENT ID REQUEST
6 COMPLETE CALLCALL PROCEEDING SDCCH
7 ASSIGNMENT COMMAND SDCCH circuitchannel
ASSIGNMENT COMPLETE FACCH
8 INITIAL AND FINAL ADDRESS(IFAM)ADDRESS COMPLETE (ACM)
FACCH
9 ANSWER (ANS FROM PSTN)
CONNECT (STOP RING TONE) FACCH
CONNECT ACKNOWLEDGE
10 CONVERSATION
Note: Parameterimmediate_assign_mode 0 Set to ASSIGN_SDCCH_ONLY
1 Set to ASSIGN_SDCCH_TCH2 to 255 (reserved for future use)
Default value 0
ALERTING (MS HEAR RING TONE)
BILLING STARTS
MOBILE INITIATED CALL CLEARING SEQUENCE
MS BSS MSC VLR HLR PSTNFACCH
DISCONNECT DISCONNECT PSTN RELEASE
FACCH MOBILE RELEASEPSTN RELEASE COMPLETE
FACCHMOBILE RELEASE COMPLETE
MS<->MSC SIGNALLING RELEASE
CLEAR COMMANDFACCH
CHANNEL RELEASE
DISCFACCH SCCP docconnect
UAFACCH CLEAR COMPLETE
RLSDRELEASE COMPLETE
BTS BSS MSC
ho_rec init ho_counter start T_hand_rqd
handover requiredNO other HO start h_intervalrequist permit
h_interval expire ho_counter expire T_hand_rqd expire(=0)
ho_rec init ho_counter start T_hand_rqd
handover required
ACK start h_intervalACK stop T_hand_rqd stop h_interval
MS stop ho_counter
handover_command start T3103
…
Note: 1. ho_counter 初值赋为handover_recognized_period, 之后递减2. ho_rec请求信息中,带目标优先表和handover_recognized_period值,此值赋予T_hand_rqd (?)3. MSC中的h_interval也是从handover_recognized_period值中得到的,它应小于T_hand_rqd
intra_bss ho
Page 15
MOBILE MOBILE(source cell) BSS (target cell)
intra_bss_ho_reqhandover command
start T3103 intra_bss_ho_atmpt
handover access
handover complete
stop T3103 intra_bss_ho
handover failure
stop T3103 MSC intra_bss_ho_fail
expire T3103 intra_bss_ho_lostms
clear request
inter_bss ho
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INTER_BSS HANDOVER
MOBILE BSS MSC BSS MOBILE(source cell) (source) hansover required (target) (target cell)
handover request inter_bss_req_to_msc start ext_ho_allocation
handover acknow.handover command stop ext_ho_allocation
handover command start ho_successful start T3103 ho_req_msc_ok inter_bss_ho_atmpt
handover access
handover complete
handover complete stop ho_successfulclear command in_inter_ho
out_inter_hoclear compelet
handover failure stop T3103 inter_bss_ms_fail
handover failure ho_req_ms_fail
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