看Log學(xué)5G(89)--共享網(wǎng)絡(luò)及尋呼消息傳遞\o"無線網(wǎng)絡(luò)"#無線網(wǎng)絡(luò)\o"5G"#5G\o"Paging"#Paging\o"NG"#NG\o"F1"#F1為了節(jié)省無線網(wǎng)絡(luò)建設(shè)成本，彌補(bǔ)自身網(wǎng)絡(luò)覆蓋不足；共建共享已成為運(yùn)營商之間網(wǎng)絡(luò)合作方式之一；在僅共享無線網(wǎng)絡(luò)(RAN),核心網(wǎng)各自獨(dú)立的場(chǎng)景中無線網(wǎng)絡(luò)中的尋呼消息呈現(xiàn)以下兩個(gè)特點(diǎn)：共享(公無線網(wǎng))站點(diǎn)中NG接口只傳遞運(yùn)營商(各自核心網(wǎng)--PLMN)的尋呼消息;F1接口和空口(Uu)傳遞和發(fā)送主運(yùn)營商和共享運(yùn)營商網(wǎng)絡(luò)的尋呼消息;根據(jù)規(guī)范，5G網(wǎng)絡(luò)中對(duì)處于RRCIdle或Inactive狀態(tài)的終端，當(dāng)有下行數(shù)據(jù)到達(dá)時(shí)啟動(dòng)尋呼，其具體流程如下。一、下行數(shù)據(jù)到達(dá)5G網(wǎng)絡(luò)有下行數(shù)據(jù)到達(dá)時(shí)首先由DN下發(fā)給UPF；當(dāng)探測(cè)到UE處于RRCInactive或Idle狀態(tài)時(shí)，UPF將數(shù)據(jù)進(jìn)行緩存后通知AMF"有數(shù)據(jù)到達(dá)"；得到消息后核心網(wǎng)AMF單元發(fā)起尋呼流程(見圖1)；

圖1.下行數(shù)據(jù)到達(dá)觸發(fā)尋呼二、無線網(wǎng)單元與接口尋呼消息傳遞5G基站進(jìn)行拆分為CU和DU后，無線網(wǎng)(RAN)通過NG接口接收尋呼消息；gNB收到尋呼消息后，由基站內(nèi)部的CU通過F1接口傳遞到DU，再傳送至天線通過空口發(fā)送。圖2.5G主要網(wǎng)元與接口三、5G尋呼消息傳送在無線網(wǎng)元拆分場(chǎng)景中先通過NG接口傳遞到CU，再通過F1接口，最后通過空口(Uu)進(jìn)行廣播。圖3.尋呼消息在無線網(wǎng)中傳遞四、NG接口尋呼消息(注釋)NgapMsg

t=initiatingMessage

u

procedureCode=pPaging

union_value

pPaging

protocolIEs

tOptFlags

pagingDRXPresent=0(尋呼DRX:否）

pagingPriorityPresent=0(尋呼優(yōu)先級(jí):否

uERadioCapabilityForPagingPresent=0(尋呼中UE無線能力=否）

pagingOriginPresent=0(原始尋呼=否）

assistanceDataForPagingPresent=0(尋呼攜帶數(shù)據(jù)=否）

uEPagingIdentity（終端尋呼ID)

t=fiveG_S_TMSI(5G-S-TMSI)

u

fiveG_S_TMSI

tOptFlags

iE_ExtensionsPresent=0(擴(kuò)展信息=否）

aMFSetID（AMF集ID)

numbits=10

data=0100000010(BIT)

aMFPointer

numbits=6

data=000000(BIT)

fiveG_TMSI

nocts=4

data=287994aa(HEX)

tAIListForPaging(尋呼的TAI列表）

n=1

elem[0]

tOptFlags

iE_ExtensionsPresent=0

tAI

tOptFlags

iE_ExtensionsPresent=0

pLMNIdentity

nocts=3

data=64f010(HEX)

tAC

nocts=3

data=4cb200(HEX)五、F1接口尋呼消息解析F1apMsg

t=initiatingMessage

u

initiatingMessage

procedureCode=pPaging

union_value

pPaging

protocolIEs

tOptFlags

pagingDRXPresent=0

pagingPriorityPresent=0

uEIdentityIndexValue(終端ID指示）

t=indexLength10（指示長(zhǎng)度）

u

indexLength10

numbits=10

data=0111001111(BIT)

pagingIdentity（尋呼ID)

t=cNUEPagingIdentity

u

cNUEPagingIdentity(核心網(wǎng)UE尋呼ID)

t=fiveG_S_TMSI

u

fiveG_S_TMSI

numbits=48

data=11018900f1cf(HEX)

pagingCell_List(尋呼小區(qū)列表）

n=4

elem[0]

tOptFlags

iE_ExtensionsPresent=0

nRCGI

tOptFlags

iE_ExtensionsPresent=0

pLMN_Identity

nocts=3

data=64f011(HEX)

nRCellIdentity(小區(qū)ID)

numbits=36

data=010011010110000000010111000000000001(BIT)elem[1]

tOptFlags

iE_ExtensionsPresent=0

nRCGI

tOptFlags

iE_ExtensionsPresent=0

pLMN_Identity

nocts=3

data=64f011(HEX)

nRCellIdentity

numbits=36

data=010011010110000000010111000000000010(BIT)

elem[2]

tOptFlags

iE_ExtensionsPresent=0

nRCGI

tOptFlags

iE_ExtensionsPresent=0

pLMN_Identity

nocts=3

data=64f011(HEX)

nRCellIdentity

numbits=36

data=010011010110000000010111000000000100(BIT)

elem[3]

tOptFlags

iE_ExtensionsPresent=0

nRCGI