call-flow-chart_compress

RACH
CALL ESTABLISHMENT (TO LAND)
BTS
MS L1 ABIS RRSM CRM SM SSM MTP/MSC
channal
T3120 request ok_acc_proc_suc_rach (could be decoded)
access_per_rach (all received)
BSC
channel
request inv_est_cause_on_rach(included phantom)
Like we have when RACH flow control
channel
is enabled.Is it like the same AGCH immediate assign. request chan_req_cause_atmpt (1510)
When we press OK, after that we have
"123 tone" reject channel
these automatic multiple attempts or T3126 start T3122 required received
expire T3122
channal
channel
request assigned alloc_sdcch
busy_sdcch
RSS
channel activation
channel activetion
acknowledge
immediate assignment
AGCH 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 indiction
T3230 L3 (intial msg) CM service request stop T3101
T303 UA ok_acc_proc
(SDCCH) ms_access_by_type (1510)
initial L3 information
CM Service request
<CR>
immediate assignment reject conn_req_to_msc
alloc_sdcch_fail
chan_req_ms_blk
classmark3(if needed)
<CC>
SCCP conn
SDCCH
T310
<CREF>
conn_refused
setup
identity request (if MSC need more MS information)
identity response
call proceeding (MSC have got enough information to setup the connection)
facility (if MS have some supplementary services, such as call divert)
call setup
SDCCH
physical context request
physical context confirmed
channel activation
channel activation ack.
assignment command
assignment
request start MSC timer for
ma_req_from_msc assignment, =30s
initiate assignment
maybe efr_req_from_msc
start assign_successful
assignment resource expire MSC timer without
request UDT(reset circuit) assignment complete' or
resouce not available
assignment failure'
alloc_tch_fail expire assign_successful
ma_cmd_to_ms_blkd
assignment failure
unsuccessful assignment
assignment failure
force queue
start T11
assignment queued
queuing indication
expire T11 release request
clear request
assignment channel clr_req_to_msc
assigned
stop T11
alloc_tch
tch_usage ….
busy_tch
start T10
ma_cmd_to_ms
expire T10 release request clear request
FACCH
assignment failure
ma_fail_from_ms
stop T10 release request clear request
L2 SABM
Only at this time, the MSC
begain to send the called
UA
address to PSTN
assignment completed
stop T10
assignment successful
stop assign_successful
PSTN
connection
required
connection response
success assignment complete
stop MSC timer for
total_call and alloc_tch counter works before alerting signal
total_call
assignment
was sent. For drive test, the drop call should be
considered after this point.
ma_complete_to_msc
(total call+intracellHO) IFAM (initial and final address)
ACM (address complete)
alerting
connect
conn ack. T313 billing start billing

MS
BTS(s)
BSC
MS RSS(s) RRSM(s) SSM SM
ho_rec
CRM(t)
ho_rec received
internal ho request
handover resource not availble
HO_FAIL_NO_RESOURCES
ALLOC_TCH_FAIL
OUT_INTRA_BSS_HO_REQ
source cell (when SSM decide
intra bss is best)
IN-(pegged for target)
OUT-(pegged for source)
NC-per neighbor
OUT_INTRA_BSS_HO_PR
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
RSS(s)
ho_cmd(RN)
<FACCH>
OUT_INTRA_BSS_HO_ATMP
RRSM(s)
initiate handover
ho_cmd start T8 OUT_HO_NC_CAUSE_ATMP
OUT_HO_CAUSE_ATMPT
INTERBAND_ACTIVITY
ho failure
OUT_INTRA_BSS_EQUIP_FA
unsuccessful handover
INTERBAND_ACTIVITY
RSS(t)
OUT_INTRA_BSS_HO_RETU
ho_access
IN_INTRA_BSS_HO_RETURN
synchronized and unsynchronized Hos? <FACCH> IN_INTRA_BSS_EQUIP_FAIL
synchronized
ho_access
handover
(only 4 times)
ho_access
ho_access
BAD_HO_REFNUM_MS
RRSM(t)
ho_detection
ho_detect received
SM
phys info (in non-synch ho; TA calculation) trans req
sabm
UA
ho_cmplt
establish
indication
switch resp
ho_cmplt
stop ho_complete
ho_succ

ho_performed
IN_INTRA_BSS_HO_SUC
OUT_INTRA_BSS_HO_SUC
IN_INTRA_BSS_NC_SUC
OUT_HO_NC_SUC
INTRA_BSS_HO_CAUSE_SU
RRSM(s)
Handover Blocked
ho_rec received
SSM
CRM(t)
internal ho request
ho resource not available
HO_FAIL_NO_RESOURCES
ALLOC_TCH_FAIL
OUT_INTRA_BSS_HO_PRI_
Handover Failure
MS RRSM(s) SSM
initiate ho
ho command start T8
ho failure
stop T8
unsuccessful
ho
Mobile Lost
MS RSS(t) RRSM(t) SSM
channeol act
acknowledge
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_LOST
CLR_REQ_TO_MSC
Bad Handover Reference Number
RRSM(t) CRM(t) SSM
internal ho request
CHANNEL ACT
ho channel
assigned
handover allocation
MS
RSS(s)
ho_cmd
( include a RN)
RRSM(s)
ho_cmd
initiate handover
Channel Coder
handover
access burst
RSS(t) L1
handover
access BAD_HO_REFNUM_MS
( compare RN received now and sent before)
RRSM(t)
physical ho_detectionn
information
ho_detection received

MTP
OUT_INTRA_BSS_HO_REQ
source cell (when SSM decides
IN-(pegged for target)
OUT-(pegged for source)
OUT_INTRA_BSS_HO_PRI_BLK
IN_INTRA_BSS_NC_ATMPT
OUT_INTRA_BSS_HO_ATMPT rr_t3103
OUT_HO_NC_CAUSE_ATMPT
OUT_HO_CAUSE_ATMPT
INTERBAND_ACTIVITY
INTERBAND_ACTIVITY
OUT_INTRA_BSS_HO_RETURN
OUT_INTRA_BSS_EQUIP_FAIL
IN_INTRA_BSS_HO_RETURN
IN_INTRA_BSS_EQUIP_FAIL
MTP

IN_INTRA_BSS_HO_SUC
OUT_INTRA_BSS_HO_SUC
IN_INTRA_BSS_NC_SUC
OUT_HO_NC_SUC
INTRA_BSS_HO_CAUSE_SUC
OUT_INTRA_BSS_HO_PRI_BLK
rr_t3103
INTERBAND_ACTIVITY
OUT_INTRA_BSS_HO_RETURN
OUT_INTRA_BSS_EQUIP_FAIL
IN_INTRA_BSS_HO_RETURN
IN_INTRA_BSS_EQUIP_FAIL

OUT_INTRA_BSS_HO_LOSTMS
CLR_REQ_TO_MSC

Successful Inter BSS Handover Sequence
MS RSS(s) RRSM(s) SSM(s) MSC
ho_rec
ho_rec
received
ho_required
OUT_INTER_BSS_REQ_TO_MSC
SSM(t) <cc>ho request
CRM(t)
RRSM(t) ho request EFR_REQ_FROM_MSC
handover resource not availble
HO_FAIL_NO_RESOURCES
RSS(t) ALLOC_TCH_FAIL
assigned
channel act Alloc_TCH
channel act
acknowledge handover allocation
start ho_complete
conn
req
switch
resp
SM
HO_REQ_MSC_OK
SSM(s)
<cc> ho Req
acknowledge
start ho_successful
handover cmd
ho access (facch)
handover cmd
RSS(t)
RRSM(s)
RRSM(t)
initiate ho
start T8
OUT_INTER_BSS_HO_ATMPT
OUT_HO_NC_CAUSE_ATMPT
OUT_HO_CAUSE_ATMPT
SSM(t)

SAMB
phys info
ho_detect
establish ind
ho_detect
received
ho_detect
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_SUC
OUT_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) MSC
handove command
initiate handover
ho command start T8
handover
failure stop T8

unsuccessful
handover
OUT_INTER_BSS_HO_RETURN
OUT_INTER_BSS_EQUIP_FAIL
handover failure
HO_REQ_MSC_FAIL

MS BSS MSC VLR HLR PSTN
1 CHANNEL REQUEST RACH
IMMEDIATE ASSIGNMENT
(SDCCH)
SIGNALLING LINK ESTABLISH
AGCH
SDCCH
2 REQUEST FOR SERVICE CR
(cm service requist, classmark..)
CC
SUBSCRIBER
(cm service requist ack.) SUBSCRIBER DETAILS
DETAILS
IF NECESSARY
3 AUTHENTICATION
SET CIPHER MODE
4 SET UP SDCCH
call info
5 EQUIPMENT ID REQUEST
6 COMPLETE CALL
CALL PROCEEDING
SDCCH
7 ASSIGNMENT COMMAND SDCCH circuit
channel
ASSIGNMENT COMPLETE
FACCH
8 INITIAL AND FINAL ADDRESS
(IFAM)
ADDRESS COMPLETE (ACM)
ALERTING (MS HEAR RING TONE)
FACCH
9 ANSWER (ANS FROM PSTN)
CONNECT (STOP RING TONE)
CONNECT ACKNOWLEDGE
10 CONVERSATION
FACCH
BILLING STARTS
Note:
Parameter
immediate_assign_mode
0 Set to ASSIGN_SDCCH_ONLY
1 Set to ASSIGN_SDCCH_TCH
2 to 255 (reserved for future use)
Default value 0

MOBILE INITIATED CALL CLEARING SEQUENCE
MS BSS MSC VLR HLR PSTN
FACCH
DISCONNECT DISCONNECT PSTN RELEASE
FACCH
MOBILE RELEASE
FACCH
MOBILE RELEASE COMPLETE
PSTN RELEASE COMPLETE
MS<->MSC SIGNALLING RELEASE
CLEAR COMMAND
FACCH
CHANNEL RELEASE
DISC
FACCH
UA
FACCH
CLEAR COMPLETE
RLSD
RELEASE COMPLETE
SCCP docconnect

BTS BSS MSC
ho_rec
init ho_counter start T_hand_rqd
handover required
NO other HO start h_interval
requist permit
ho_counter expire T_hand_rqd expire
(=0)
h_interval expire
ho_rec
init ho_counter start T_hand_rqd
handover required
ACK start h_interval
ACK 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 的 值

值 , 此 值 赋 予 T_hand_rqd (?)
, 它 应 小 于 T_hand_rqd 的 值

intra_bss ho
MOBILE
MOBILE
(source cell) BSS (target cell)
handover command
intra_bss_ho_req
start T3103
intra_bss_ho_atmpt
handover access
handover complete
stop T3103
intra_bss_ho
handover failure
stop T3103
intra_bss_ho_fail
MSC
expire T3103
intra_bss_ho_lostms
clear request
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inter_bss ho
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_successful
clear command in_inter_ho
handover failure
out_inter_ho
clear compelet
stop T3103
inter_bss_ms_fail
handover failure
ho_req_ms_fail
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inter_bss ho
Page 20