HUAWEI MSC POOL

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N i DungT ng quan v MSC Pool(MiP) Cc khi ni m c b n trong MiP Cc v n c b n trong MiP

T ng quan

MSC Pool l m t m hnh u n i m i c pht tri n trn m hnh u n i MSC-BSC/RNC hi n t i. Trong m hnh MSC Pool, m i BSC/RNC c u n i v i t t c cc MSC trong Pool. M t s u i m chnh c a MSC Pool l: S d ng chung ti nguyn, cn b ng t i trn cc MSC, gi m s l n Location Update, gi m Handover inter MSC, t ng c ng kh n ng d phng cho MSC v kh n ng UCTT t c th i khi MSC b s c .

T ng quan

MSC1

MSC2

M ng hi n t iBSC1/ RNC1 BSC2/ RNC2 BSC3/ RNC3

MSC1

MSC2

MSC PoolBSC1/ RNC1 BSC2/ RNC2 BSC3/ RNC3

MSC pool capacityItem Maximum capacity supported by an MSC Pool Specifications Number of MSC servers Number of MGWs Number of connected RNCs (ATM networking mode) Maximum capacity supported by an MGW Number of connected BSCs (TDM networking mode) Number of connected BSCs/RNCs (IP networking mode) Value 32 300 50

50

128

M t s khi ni m trong MiP

MSC Pool and MSC Pool areaMSC Pool MSC1 MSC2

MSC Pool areaBSC1/ RNC1 BSC2/ RNC2 BSC3/ RNC3 BSC4/ RNC4

BSC/RNC out side

M t s khi ni m trong MiP

TMSI and NRI

TMSI: Temporary Mobile Station Identity NRI: network resource identifierTMSI

31 30

29 VLR restart

28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 ...

0

CS/PS

NRI range

NRI value

User infor

M t s khi ni m trong MiP

Null NRI: l m t gi tr c bi t c a NRI dng trong vi c thng bo r ng MSC ang out of service. Non-broadcast LAI: dng yu c u MS th c hi n LU sang MSC khc khi tr ng thi c a MSC c set l out of service. Virtual MGW: M t MGW th c c th c chia thnh nhi u MGW o, m i MGW o n i n 1 MSC_S.

M t s khi ni m trong MiP

Iu-Flex, A-Flex: L tnh n ng cho php RNC ho c BSC c th th c hi n u n i n nhi u MSC cng lc. Iu-Flex, A-Flex on MGW: L ch c n ng h tr RNC/BSC u n i n nhi u MSC cng lc trong tr ng h p RNC/BSC khng h tr Flex function.

Cc v n

c b n trong MiP

Load Balancing Cn b ng t i MGW v MGW qu n l CIC Location update Hand over Paging UCTT t c th i trong MiP

Load Balancing trong MiPLoad Balancing l thu t ton c BSC/RNC l a ch n MSC ph c v MS trong tr ng h p MS attach vo h th ng l n u.

Load balance here.

MSC1

MSC2

BSC1/ RNC1

BSC2/ RNC2

BSC3/ RNC3

MS LU trong l n

u tin.

Cn b ng t i gi a cc MGWCu c g i t ngoi pool n: MSC_S trong pools th c hi n ch n 1 trong cc MGW c u n i n BSC ch a thu bao ch thng qua vi c t l s d ng knh u n i gi a MGW v BSC. Cu c g i gi a 2 MSC trong pool: th MSC_S ch s ch n cng MGW v t l v i MSC_S kh i t o. Cu c g i trong cng MSC trong pool: MSC_S s ch n VMGW ch cng v i VMGW kh i t o.

MGW qu n l CICi v i m ng hi n t i, MSC_S s qu n l cc CIC v c p pht trong t ng cu c g i. i v i MSC pool, m t MGW ck tn i n nhi u MSC_S cng lc, do n u m i MSC_S u qu n l v c p pht CIC th s ph c t p v khng t i u ti nguy n. Gi i php l CIC k t n i n BSC s c config trn MGW v c MGW qu n l, c p pht khi nh n c yu c u t cc MSC_S trong pool.

Location update trong MiPTrong MSC pool, vi c LU v n th c hi n nh thng th ng. Trong tr ng h p thu bao di chuy n trong vng MSC pool th MSC v n c gi nguyn nh l n u tin MS register v h th ng. MSC1 MSC2

BSC1/ RNC1

BSC2/ RNC2

LAC1

LAC2

Handover trong MiPHandover trong vng ph c v MSC Pool: Vi c handover khi thu bao di chuy n trong t t c cc BSC thu c MSC pool gi ng nh handover trong cng MSC. Handover t vng MSC pool ra ngoi v t ngoi vo trong MSC pool: gi ng nh tr ng h p handover gi a 2 MSC thng th ng.

Paging trong MiPTrong MSC pool, vi c paging v n c th c hi n thng qua TMSI ho c IMSI nh bnh th ng. Khi BSC nh n c thng tin respone t thu bao c ch a TMSI(NRI) th BSC forward n MSC thng qua NRI. Khi BSC nh n c thng tin respone t thu bao ch ch a IMSI th BSC s l a ch n MSC forward b n tin thng qua vi c l u gi a t m th i IMSI tr c . Trong ton b MSC pool, vng ph c v l r t l n do c n cn nh c vi c th c hi n paging trn ton b cc LAI thu c MSC.

UCTT trong MiPMO call: Trong MSC pool, khi 1 MSC b s c th BSC s nh n ra i u ny v route t t cc cc d ch v c kh i t o sang 1 MSC khc trong pool theo thu t ton cn b ng t i:

i v i MS register m i: MSC trong pool s LU bnh th ng v cung c p d ch v . i v i MS c , thu c MSC l i: MSC m i s th c hi n LU t c th i v cho php d ch v nh bnh th ng

UCTT trong MiPMT call: Trong tr ng h p 1 MSC trong pool b s c , HLR khng th PRN thnh cng nn cu c g i s b fail, kh c ph c th trong MSC pool th c hi n nh sau:

HLR

STP

MSC1

MSC 2 MSC Pool

MSC3

Th c hi n khai bo backup trn STP g i PRN n MSC d phng trong pool. Th c hi n khai bo backup thng tin thu bao (IMSI, LAI, status) sang VLR d phng trong pool.

UCTT trong MiP (MT cont)MT call:

HLR

MSC3 nh n c PRN t HLR v n th c hi n paging n MS v i IMSI v LAI c c. Khi BSC nh n c response t thu bao v i IMSI, BSC s th c hi n forward n MSC3. MSC3 nh n c b n tin c a BSC, n s th c hi n LU t c th cho thu bao sau PRN cho HLR v cho php k t n i cu c g i nh bnh th ng.

STP

MSC1

MSC 2 MSC Pool

MSC3

Backup VLR

Thank you!