Tài Liệu Hướng Dẫn Drivingtest

Ti Liu Tham Kho Drivingtest: 1

GSM Cell Parameters

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Copyright 2008 Huawei Technologies Co., Ltd. All rights reserved.

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Descriptions1. Cell Parameters Overview 2. Cell Parameters Introduction 3. Case Study


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Cell Parameters Overview

Cell Parameters include the most of radio network parameters transmitted via Um interface.

Via receiving cell parameters, MS is able to exactly select, access and coordinate with the network through which different kinds of service is provided.

Via reasonably cell parameters, BTS can run in high point and whole system can be effectively utilized to provide more and better services although basing on limited resources.

Copyright 2008 Huawei Technologie Co., Ltd. All rights reserved. s

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-, Tham s t bo bao gm hu ht cc thng s mng v tuyn truyn qua giao din Um. Thng qua nhn c cc thng s di ng, MS c th chn chnh xc, truy cp v phi hp vi mng thng qua cc loi dch v khc nhau c cung cp. Thng qua cc thng s hp l t bo, cc trm BTS c th chy ti im cao v ton b h thng c th c s dng c hiu qu cung cp cc dch v nhiu hn v tt hn mc d trn c s ngun lc hn ch

Cell Parameters Overview

Cell Parameters can be sent through two kinds of logical channels

BCCH (in idle mode) SACCH (in dedicated mode)

4, Tham s t bo c th c gi thng qua hai loi ca cc knh logic BCCH (trong ch nhn ri) SACCH (trong ch chuyn dng) 5,


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Descriptions1. Cell Parameters Overview 2. Cell Parameters Introduction 3. Case Study


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Introduction to Cell Parameters

Huawei GSM cell parameters:

Network Identity Parameters Idle Mode Parameters Call Control Parameters Cell Selection and Reselection Parameters Other Parameters


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Huawei cc thng s di ng GSM: Nhn dng tham s mng Nhn ri ch tham s Gi Cc thng s kim sot Tham s di ng la chn v Reselection Cc thng s khc

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Cell Data Mapping in Different Statuses of MSPower onSelect Network (Network Identity Para. )

Cell Selection (Cell Selection Para.) Access Network (Call Control Para.)

Dedicated Mode (Call Control Para.)

Cell Reselection Mode (Cell Reselection Para.)

Paging Mode (Idle Mode Para.)

Idle Mode (Idle Mode Para.)


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Network Identity Parameter CGI

Network identity parameters mainly include

Cell Global Identity (CGI) Base Station Identity Code (BSIC)


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Mng thng s nhn dng ch yu bao gm Nhn dng di ng ton cu (CGI) M nhn dng trm c s (BSIC)

=>L mt h thng thng tin di ng ton cu di ng, GSM tin hnh m ha nghim ngt i vi tng mng GSM mi nc, v thm ch mi v tr khu vc, trm BTS, v t bo, m bo rng mi t bo tng ng vi mt s duy nht trn ton th gii. Vic p dng chng trnh ny m ha c th t c cc mc tiu sau y: 1. m bo rng MS c th xc nh chnh xc cc mng hin ti, do , rng MS c th chn chnh xc cc mng d kin ca cc thu bao v cc nh khai thc. 2. m bo rng cc mng c th bit v tr thi gian thc ca MS, v vy cc mng c th cung cp cc yu cu dch v khc nhau t MS. 3. m bo rng MS c th bo co thng tin ca cc t bo hng xm ng vo mng trong cuc tr chuyn, do mng li c th thc hin bn giao khi cn thit gi cho cuc tr chuyn lin tc cho cc thu bao in thoi di ng.9,

Mobile Country Code MCC

Definition: MCC consists of 3 decimal numbers. It indicates the home country of the mobile subscriber.

Format: MCC is composed of 3 decimal numbers. The coding range is decimal 000~ 999.

Location: Cell Attributes


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-CGI = MCC + MNC + LAC + CI Mt khi MS nhn c thng tin SYS, n gii m thng tin CGI, v quyt nh liu n c

th li trong t bo theo MCC v cng ty a ghi bi CGI. ng thi, thm phn cho d v tr hin ti c thay i, quyt nh xem c nn thc hin cp nht v tr. Trong qu trnh cp nht v tr, MS s bo co LAI mi vo mng, cc mng c th bit LA trong MS hin ang nm.

=>MCC c s dng trong nhn dng thu bao di ng quc t (IMSI) v bn sc khu vc v tr (LAI). 1. LAI. N l nh k truyn cc thng s t bo ca mi t bo. MCC cho bit t nc ca GSM PLMN. MS s dng thng tin nhn c l c s quan trng la chn mng. 2. IMSI ca MS. IMSI ca MS cng c MCC. N cho thy cc quc gia thng tr ca thu bao di ng. Khi MS ng nhp vo mng hoc p dng cho mt dch v nht nh, phi bo co IMSI mng (Khi TMSI l khng c.). Mng li ny s dng MCC trong IMSI nh gi liu thu bao ny l mt thu bao chuyn vng quc t. Nh l tiu chun nhn dng duy nht t nc, cc MCC c cp pht v qun l bi Lin minh Vin thng Quc t (ITU). Mc nh gi tr E.212 ITU (s xanh) quy nh s lng MCC cho mi quc gia. MCC ca Trung Quc l 460 (thp phn). Do ngha c bit ca MCC, sa i l b cm khi n c thit lp trong mng.10,

Mobile Network Code MNC

Definition: MNC is used to uniquely identify a specific GSM PLMN network in a certain country (decided by MCC).

Format: MNC is composed of two decimal numbers. The coding range is decimal 00~ 999.



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Definition: MNC is used to uniquely identify a specific GSM PLMN network in a certain country (decided by MCC).

Format: MNC is composed of two decimal numbers. The coding range is decimal 00~999. Location: Cell Attributes

-MNC c s dng trong nhn dng thu bao di ng quc t (IMSI) v bn sc khu vc v tr (LAI). LAI. N l nh k truyn trong mi t bo. y, cng ty a quc cho bit s mng GSM PLMN. MS s dng thng tin nhn c nh l mt c s quan trng la chn mng. IMSI cng cha MNC. N cho thy cc nh mng GSM PLMN ca thu bao. Khi MS =>ng nhp vo mng hoc p dng cho mt dch v nht nh, n phi bo co IMSI vo mng (Khi TMSI l khng c.). Mng li gim kho cho d thu bao ny l mt thu bao chuyn vng theo cc cng ty a quc trong IMSI, v s dng n nh l mt trong cc thng s quan trng gii quyt vn thu bao HLR. Nu mt quc gia c nhiu hn mt GSM PLMN, cc mng khc nhau c khc nhau MNC. MNC c phn b ca b phn c lin quan qun l vin thng ca t nc. Mt nh iu hnh c th c mt hoc nhiu cng ty a quc (lin quan n quy m cung cp dch v, thng l mt nh iu hnh mt MNC). Cc nh khai thc khc nhau c th chia s cng mt MNC. Hin nay, Trung Quc c hai mng GSM, c iu hnh bi China Mobile v China Unicom. MNC ca h l 00 v 01 tng ng. Do ngha c bit ca MNC, sa i l b cm khi n c thit lp trong mng.11,

Network Identity Parameter CGI

CGI= MCC+ MNC+ LAC+ CI Once MS receives SYS INFO, it decodes the CGI information, and decides whether it can stay in the cell according to the MCC and MNC indicated by CGI.

At the same time, it judges whether the current location area is changed, so as to decide whether to execute location update. During the location update process, MS will report the new LAI to the network, so that the network can know the LA in which MS is currently located.


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-CGI=MCC+MNC+LAC+CI Once MS receives SYS INFO, it decodes the CGI information, and decides whether it can stay in the cell according to the MCC and MNC indicated by CGI. At the same time, it judges whether the current location area is changed, so as to decide whether to execute location update. During the location update process, MS will report the new LAI to the network, so that the network can know the LA in which MS is currently located.

=>As a global cellular mobile communication system, GSM conducts strict coding for each GSM network in every country, and even every location area, BTS, and cell, so as to ensure that each cell corresponds to a unique number all over the world. The adoption of this coding scheme can achieve the following objectives: 1. Ensure that MS can correctly identify the current network, so that MS can accurately select the network expected by subscribers and operators. 2. Ensure that the network can know the real-time position of MS, so that the network can provide various service requests from the MS. 3. Ensure that the MS can report correct neighbor cells information to the network during conversation, so that network can perform handover when necessary to keep continuous conversation for the mobile subscribers.12,

Location Area Code LAC

Definition: To locate the location of MS, the whole area covered by each GSM PLMN is divided into different location areas. LAC is used to identify different location areas.

Format: LAI contains LAC, which is composed of two bytes. LAC adopts hexadecimal coding. The available range is from 0001H to FFFEH. The code 0000H and FFFFH cannot be used (please refer to specification GSM0303, 0408, and 1111). One location area can contain one or more cells.



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-Definition: To locate the location of MS, the whole area covered by each GSM PLMN is divided into different location areas. LAC is used to identify different location areas. Format: LAI contains LAC, which is composed of two bytes. LAC adopts hexadecimal coding. The available range is from 0001H to FFFEH. The code 0000H and FFFFH cannot be used (please refer to specification GSM0303, 0408, and 1111). One location area can contain one or more cells. Location: Cell Attributes

=>When MS is powered on or LAC of current cell is found to be different from its originally stored Descriptions, MS will inform network of the current location area via location update, and the network uses the LAI for paging. Generally the allocation and coding of LAC is set at the early stage of network construction, and seldom modified during the operation. The size of location area (LA) is one of key factors in the system. If the LA coverage is too small, the chances for MS to update location increase, and this will increase the signaling load in the system. If the LA coverage is too large, when network conducts paging to the MS, the same paging information will be transmitted in a large number of cells, and this will lead to the heavy load on CCCH. The adjustment of LA size has no unified standard. Operating departments can decide whether to adjust the size according to the currently running network. If the CCCH signaling load is heavy because of too big

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Cell Identity CI

Definition: To uniquely identify each cell in the GSM PLMN, the network operator needs to allocate one code for each cell, which is the cell identity (CI). Cell identity, together with LAI, is used for identity of each cell in the world.

Format: CI is composed of 16 bits, The available range is 0~ 65535. Location: Cell Attributes


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bo bng cch s dng cng mt TCTD. TCTD MSC nn c tng t nh trn BSC. Nu khng, MS khng th thc hin cuc gi trong t bo-nh ngha: nhn dng duy nht mi t bo trong cc PLMN GSM, cc nh iu hnh mng cn phi cp pht mt m cho mi t bo, m l nhn dng (CI). T bo nhn dng, cng vi LAI, c s dng cho bn sc ca mi t bo trn th gii. nh dng: CI bao gm 16 bit, phm vi c sn l 0 ~ 65535. n t: thuc tnh di ng

=>T bo nhn dn (CI) l mt phn ca nhn dng di ng ton cu (CGI), c truyn ti trong mi t bo. Ni chung l khng c hn ch cho vic phn b ca CI. Gi tr 0-65535 (thp phn) c th thu c. Nhng n phi c m bo rng mt trong nhng v tr khu vc khng th c hai t bo cng vi cc TCTD. CI l thng c xc nh trong thit k mng. Ngoi tr mt s trng hp c bit, gi tr CI khng th thay i trong hot ng ca h thng. Xin lu rng mt trong nhng v tr khu vc l khng c php c hai hay nhiu t ny.14,

Network Identity Parameter BSIC

BSIC= NCC+ BCC In GSM system, each BTS is allocated with a color code, which is called BSIC. MS can identify two cells with the same BCCH by the help of BSIC.

In network planning, make sure that BCCH of neighbor cells are different from the serving cells BCCH to reduce the interference.

Practically it is still possible that a same BCCH is re-used in the surrounding cells. For cells using the same BCCH in a relevant near distance, their BSIC must be different so that MS can identify two neighbor cells with same BCCH.


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-BSIC=NCC+BCC In GSM system, each BTS is allocated with a color code, which is called BSIC. MS can identify two cells with the same BCCH by the help of BSIC. In network planning, make sure that BCCH of neighbor cells are different from the serving cells BCCH to reduce the interference. Practically it is still possible that a same BCCH is re-used in the surrounding cells. For cells using the same BCCH in a relevant near distance, their BSIC must be different so that MS can identify two neighbor cells with same BCCH.

=>BSIC = NCC + BCC Trong h thng GSM, mi trm BTS c phn b vi mt m mu, c gi l BSIC. MS c th xc nh cc t bo vi cng mt BCCH s gip ca BSIC. Trong quy hoch mng li, m bo BCCH ca cc t bo ln cn khc nhau t BCCH cc t bo phc v gim s can thip. Thc t vn cn c th l mt BCCH cng l ti s dng trong cc t bo xung quanh. i vi cc t bo bng cch s dng BCCH cng trong mt khong cch gn c lin quan, BSIC ca h phi c khc nhau MS c th xc nh hai t bo hng xm cng vi BCCH. BSIC c truyn i trn knh ng b (SCH) ca mi t bo. Chc nng ca mnh nh di y: 1. Nu MS c SCH, n c coi l ng b vi cc t bo. Tuy nhin, c chnh xc cc thng tin trn ng xung bo hiu knh chung, MS

phi c TSC (o to tip theo; Code) c thng qua bi cc knh tn hiu ph bin. Theo GSM c im k thut, TS (o to tip theo) c tm nh dng c nh, c i din bi TSC dao ng 0 ~ 7. TSC s thng qua knh tn hiu ph bin ca mi t bo ch l BCC ca t bo. V vy, mt trong cc chc nng ca BSIC l thng bo cho MS ca TSC thng qua cc knh tn hiu thng thng ca t bo. 2. K t khi BSIC tham d qu trnh m ha cc bit thng tin trong burst truy cp ngu nhin, n c th c s dng ngn chn cc trm BTS t vic chp nhn mt RCH truyn t MS trong mt t bo ngi hng xm l tn hiu truy cp t MS ca t bo phc v. 3. Khi MS ch chuyn dng, n phi o lng mc BCCH ca cc t bo hng xm v bo co vi trm BTS theo BA2 c gi vo SACCH, bao gm c BSIC ca mnh. Trong trng hp c bit, khi c hai hay nhiu t bo bng cch s dng BCCH cng trong cc t bo hng xm, BSC c th s dng BSIC phn bit cc t bo ny v trnh sai bn giao hoc thm ch chuyn giao tht bi. 4. MS phi o cc tn hiu BCCH ca cc t bo ln cn trong ch chuyn dng, v bo co kt qu vo mng. K t khi MS gi bo co o lng c cha cc m t ca mt ti a ca 6 t bo hng xm mi ln, n l cn thit kim sot MS ch bo co cc t bo c mi quan h hng xm vi cc t bo phc v. NCC c s dng cho mc ch trn. Cc nh khai thc mng c th s dng tham s "ca NCC c php" kim sot MS bo co cc t bo hng xm vi NCC trong t bo phc v ch cho php. 15,

Network Color Code NCC

Definition: NCC is a part of BSIC. MS uses it to distinguish adjacent BTS that belong to different GSM PLMN.

Format: NCC is composed of 3 bits, with the range of 0 to 7. Location: Cell Attributes


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ng b ca mi t bo. Trong nhiu trng hp, khc nhau PLMNs GSM c bo him ging ht nhau trong nhiu quy hoch mng li ca h l c lp vi nhau. m bo rng BTSs lin k c BSICs khc nhau, n thng c quy nh rng lin k GSM PLMN chn khc nhau NCC. NCC v BCC vi nhau to thnh c s m s nhn dng knh (BSIC), truyn i trn knh Cc t bo lin k hoc gn vi cng mt tn s BCCH phi c BSIC khc nhau. Ch c bit nn c tr cho cc cu hnh ca cc t bo trong khu vc ranh gii. ,16

BTS Color Code BCC

Definition: BCC is a part of BSIC. For its function, please refer to above sections.

Format: BCC is composed of 3 bits. The available range is 0~ 7. Location: Cell Attributes


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BSIC bao gm BCC v NCC c truyn trn SCH. BCC l mt phn ca BSIC, c s dng xc nh cc t bo khc nhau vi BCCH tng t trong cng mt h thng GSM. Theo yu cu ca c im k thut GSM, TSC ca BCCH trong mi t bo cng vi BCC ca t bo. Ni chung, tnh nht qun ny phi c m bo bi nh sn xut. Cc t bo lin k hoc gn bng cch s dng cng mt BCCH phi c BSIC khc nhau, nu khng, gia cc t bo bn giao c th khng thnh cng. BCC lp k hoch c ba gii php. Tt c trong s h thc hin nguyn tc khong cch xem xt trnh va chm ca cc t bo lin k vi BCCH v BSIC cng. 1. Da trn cc thit lp BCC hin c, chn mt trong cc BCC c s dng bi cc t bo khc, m bo cng mt lc BCC c la chn s khng gy ra s va chm BSIC / BCCH vi cc t bo lin k. u im ca gii php ny l n c th m bo BCC c phn b u trong ton b mng li. Tuy nhin, nu thc hin th cng, gii php ny l tn thi gian v phin h, chng ta c th s dng cc cng c phn phi t ng. 2. Khi xc nh hp ng BCC, c gng gn gi tr t 0. Khi gy ra va chm BSIC / BCCH, m rng phm vi gi tr. u im l s lng BCC s dng c gi nh nht. V vy, khi thm mt trm BTS mi, trnh cc va chm BSIC / BCCH, BCC mi c th c la chn m khng sa i BCC ca cc t bo gc xung quanh. 3. Phn b BCC theo m hnh ti s dng ca n. l s dng BCC tng

t trong vng mt cm. iu c ngha rng cc t bo ln cn khng c th s dng BCCH cng vi cc t bo dch v. Gii php ny thng c s dng, v cng n gin nht.17,

Idle Mode Parameters

ATT CCCH Conf BS_AG_BLKS_RES BS_PA_MFRAMES Paging Times Period of Periodic Location Update(T3212) Neighbor Cell Description (BA Table)


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C rt nhiu cc thng s trong h thng GSM, h thng chuyn n MS t BTS thng qua giao din Um. N nhm mc ch duy tr s hp tc thun li gia MS v BTS. Mt khc, cc gi tr ca cc tham s ny trc tip nh hng n ti trng giao thng v lu lng truyn tn hiu ca mi phn ca h thng. Do , cu hnh thch hp ca cc tham s ny l rt quan trng n hot ng thun li v n nh ca h thng. Sau y s xy dng trn cc nh ngha, phm vi gi tr, v cc hiu ng trn h thng ca cc tham s h thng iu khin.18,

ATT

Value Range: Yes, No Default Value Yes Description: It is Attach-detach allowed. It is used to inform MS whether IMSI attach-detach is allowed in this cell. If it is set to Yes, the network will not process the connection to the called mobile subscriber when MS is power-off. Thus network processing time and radio resources are saved. Otherwise the network will process the connection even though the MS has been powered off.

Location: Cell Attributes/Idle Mode/Basic Idle Parameters


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Tch (split) qu trnh (IMSI) cp n qu trnh MS thng bo mng rng l chuyn t trng thi lm vic khng lm vic nh nc (thng l mt qu trnh in-off), hoc th SIM c ly ra t MS. Khi nhn c thng bo t MS, mng bit rng thu bao IMSI l nh nc khng lm vic. V vy, nu c gi l MS, kt ni cuc gi s c thc hin. IMSI nh km qu trnh ngc li tch qu trnh. N l qu trnh m MS thng bo cho mng li bc vo khu vc dch v (thng l mt qu trnh in-on) hoc th SIM c a vo MS. Sau khi vo nh nc dch v mt ln na, MS s kim tra xem v tr hin ti (LAI) l LAI mi nht c ghi li trong MS. Nu c, MS s bt u IMSI nh km qu trnh. Nu khng, MS s bt u qu trnh cp nht v tr, khi nhn c cp nht v tr hoc IMSI nh km qu trnh, cc mng s ch ra rng thu bao IMSI ny trong trng thi lm vic. Lu rng ATT cu hnh ca cc t bo khc nhau trong cng mt LAI phi c cng. l bi v IMSI qu trnh tch s c bt u khi MS l sc mnh-off trong cc t bo vi ATT nh c. Mng s ghi li rng thu bao ny l nh nc khng lm vic v t chi tt c cc yu cu kt ni c gi l thu bao ny. Khi MS l sc mnh trn mt ln na, nu n l trong cng mt LAI nh n c in-off (do qu trnh LAI cp nht s khng c bt u), nhng trong mt t bo, v AT & T ca t bo c thit lp nh l khng c, sau MS s khng bt u IMSI nh km qu

trnh. Trong trng hp ny, thu bao ny khng th c gi l bnh thng cho n khi MS bt u qu trnh cp nht v tr.19,

CCCH Conf

Value Range: 1 Compounding CCCH , 1 Non-Compounding CCCH, 2 Non-Compounding CCCHs, 3 Non-compounding CCCHs, 4 Noncompounding CCCHs. Default Value: When there is one TRX in the cell, one combined CCCH is recommended (in a system with few paging messages in location area). For others, it is configured according to the number of TRX in the cell. Description: It is Common Control Channel Configuration. CCCH configuration determines the capacity of PCH, AGCH and RACH. This parameter can be automatically configured by system according to the TRX channel configuration. Location: Cell Attributes/Idle Mode/Basic Idle Parameters


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-Trong h thng GSM, knh iu khin chung ng xung ch yu bao

gm truy cp Cp Channel (AGCH) v knh Paging (PCH). N phc v gi cc truy cp c cp (giao ngay) v tin nhn phn trang. CCCH l chia s. Theo cu hnh ca knh giao thng v m hnh giao thng, CCCH c th c thc hin bi mt hoc nhiu knh vt l. Hn na, CCCH v SDCCH c th chia s mt knh vt l. MS cn phi bit cch CCCH (s) l / c cu hnh, n c th tm v chn mt ngi lng nghe. Conf CCCH l ch c dng ni vi MS v vn ny. Khi CCCH l mt knh vt l m kt hp vi SDCCH, nng lc ca CCCH l thp nht. Khi CCCH l mt knh vt l m khng kt hp vi SDCCH, cng sut cao hn. i vi cc trng hp khc, cc knh vt l c s dng nh CCCH, cao hn nng lc CCCH. Cu hnh ca Conf CCCH c quy nh c th theo m hnh giao thng. M hnh ny lin quan cht ch n v tr di ng v mi trng. Theo kinh nghim, khi s lng TRX trong t bo l 1 hoc 2, l khuyn khch s dng mt CCCH kt hp nh l knh iu khin chung. Khi s lng TRX trong t bo l 3 hoc 4, n c khuyn khch s dng mt CCCH khng kt hp nh l knh iu khin chung. Hin nay CCCH c th c cu hnh theo ti lu lng thc t. Nu ti

trng phn trang l rt nng n, giao thng phn trang ca t bo c phn phi thng qua nhiu CCCH knh cch vt cht khc. S ch c bit nn c tr tin PCH trong CCCH. Ni chung PCH nng lc ca cc t bo khc nhau di mt LAC phi c nh vy.20,

BS_AG_BLKS_RES

Value Range: 0~ (Non-Compounding CCCHs), 0~ (1 combined 7 2 CCCH) Unit: Block Default Value: 2 (Non-combined CCCH), 1(1 combined CCCH) Description: It is also called Access Granted Blocks Reserved. It is the number of CCCH channel message blocks that are reserved in one multi-frame for access granted channels (AGCH). Location: Cell Attributes/Idle Mode/Basic Idle Parameters


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Nh downlink CCCH bao gm c AGCH v PCH, n l cn thit thit lp s lng ca cc khi, c dnh ring cho AGCH gia cc khi tin nhn CCCH. cho MS bit thng tin cu hnh nh vy, tham s t bo ca mi t bo bao gm mt tham s cu hnh, l s lng ngn chn truy cp c cp bo lu (BS_AG_BLKS_RES). Tham s ny thc s ch nh t l AGCH v PCH CCCH. N nh hng n thi gian phn ng ca MS phn trang. Cc nh iu hnh mng c th iu chnh tham s ny cn bng lu lng truy cp ca AGCH v PCH bng cch cp n cc nguyn tc sau y: 1. Nguyn tc BS_AG_BLKS_RES: tham s ny cng nh cng tt m khng gy ra tnh trng qu ti ca AGCH, tng kh nng ca phn trang v ci thin hiu sut h thng. 2. Ni chung n c khuyn khch la chn 1 (khi CCCH Conf l 1 kt hp CCCH), 2 hoc 3 (khi Conf CCCH l mt trong nhng gi tr khc) cho BS_AG_BLKS_RES. 3. Trong qu trnh hot ng, quan st cc s liu thng k ca qu ti

AGCH v iu chnh BS_AG_BLKS_RES ng. Lu : Trong h thng Huawei, trong khi AGCH c tt c chim ng, nu PCH l min ph, n c th c s dng gi lnh chuyn nhng ngay lp tc. Nu khi AGCH dnh ring c thit lp l 0, s phn cng ngay lp tc s c gi ch khi c knh PCH min ph. V vy, cng sut c nh dnh cho AGCH l cn thit.

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BS_PA_MFRAMES

Value Range: 2~ 9 Unit: Multi-frame period (51 frames) Default Value: 2 Multi-frame period Description: It is Paging Channel Multi-frames. It defines the number of multi-frames used as a cycle of paging sub-channels.

Location: Cell Attributes/Idle Mode/Basic Idle Parameters

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Tham s ny quy nh c th s lng cc knh c giao trong mt t bo phn trang. Trong mng, MS mn hnh phn trang con knh n thuc v v b qua cc m t ca nhng ngi khc. Khi tham s ny c thit lp ln hn, c nhiu ph knh phn trang trong t bo v ph hp s c t MS trong mi tiu knh phn trang. Do , kh nng chu lc ca PCH s c nhiu hn (v mt l thuyt nng lc ca mi PCH khng tng, nhng b m b m tin nhn phn trang trong mi BTS c tng ln, m lm cho vic gi tin nhn phn trang ngay c trong min thi gian), v tui th ca pin MS s c lu hn. Cc gi tr ca tham s ny nn cng nh cng tt trong iu

kin qu ti trn PCH khng xy ra. Trong hot ng, ti trng PCH phi c o thng xuyn v gi tr ca tham s ny nn c iu chnh ng theo ti trng ca PCH. Trong mt khu vc a im, phn trang c gi trong tt c cc t bo. V vy, tt c cc t bo trong khu vc cng mt v tr nn c cng hoc gn PCH cng cng sut (s lng ca phn trang cc knh). Trong khu vc, ni PCH phi chu mt ti trng trung bnh hoc ln, l ngh c thit lp nh l 6 hoc 7 (6 hoc 7 a khung c s dng nh l mt chu k ca phn trang). i vi khu vc vi mt ti nh, n c thit lp l 4 hoc 5. Bn cnh , n thng c thit lp nh l 2. Lu : 1. Mt CCCH khi (bn khe thi gian CCCH lin tip) c th mang thng tin ca hai IMSI pagings hoc bn pagings TMSI hoc hai nhim v AGCH trc tip. 2. Trong ch nhn ri MS tri trong mt t bo. DSC c khi to mt phn s nguyn 90 / N (N l BS_PA_MFARMES, vi gi tr khong: 2 ~ 9). khi MS thnh cng c th gii m cc tin nhn trn phn trang ph knh, DSC s tng thm 1, nhng n s khng vt qu ban u gi tr. Nu gii m tht bi, DSC s gim 4. Nu DSC

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