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5Gモバイル技術の基礎講座

ttsubo
December 07, 2022

 5Gモバイル技術の基礎講座

ttsubo

December 07, 2022
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  1. 546#0*5PTIJLJ ̑(ϞόΠϧٕज़ͷجૅߨ࠲  (113FMFBTF

  2. "HFOEB  ᶃ(ͷप೾਺ׂΓ౰ͯ 
 ᶄ(ͷඪ४Խಈ޲ 
 ᶅ(ϞόΠϧͷ઀ଓܗଶ 
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  3.  ᶃ(ͷप೾਺ׂΓ౰ͯ

  4. (ͷप೾਺ׂΓ౰ͯ   IUUQTXXXTPVNVHPKQ[email protected]QEG

  5.       ()[ଳ ()[ଳ  

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 ʢ԰֎԰಺ʣ ແઢΞΫηε 
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  7. /55υίϞͷ(ରԠόϯυ  όϯυ O O O O /3ɻ(-5&޲͚प೾਺Λ(ʹస༻ ి೾ͷಛ௃ 4VCɻࠃࡍతʹओཁͳ(௨৴ͷप೾਺ଳ

    4VCɻυίϞͷΈ͕ରԠ͍ͯ͠Δप೾਺ଳ ϛϦ೾ɻ(Β͍͠ߴ଎௨৴Λ࣮ݱ͢Δप೾਺ଳ ௨৴ํࣜ '%% 5%% 5%% 5%% υίϞͷରԠόϯυ͸ɺओཁͳप೾਺ଳͷʮOʯͱυίϞͷΈ͕ରԠ͍ͯ͠ΔʮOʯ ʹՃ͑ͯɺϛϦ೾Ͱ(Β͍͠ߴ଎ɾେ༰ྔ௨৴͕ՄೳͳʮOʯʹରԠ͍ͯ͠Δɻ (௨৴Λ޿ൣʹఏڙ͢ΔͨΊͷʮ4VCʯͱΑΓϋΠεϖοΫͳʮϛϦ೾ʯͱ͍͏૊Έ߹ Θͤʹͳ͍ͬͯΔͷ͕ಛ௃ɻ͞Βʹɺ೥य़͔Β͸(-5&޲͚ͷप೾਺Λ(αʔϏε ʹస༻ͨ͠ʮ/3ԽʯΛల։ɻ
  8. %PDPNP(୺຤ͷରԠप೾਺ଳʢ೥ൃചػछʣ 

  9. 

  10.  ᶄ(ͷඪ४Խಈ޲

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  13. $POUSPM1MBOF1SPUPDPM4UBDLT  33$ /("1 3FMBZ 1%$1 3-$ ."$ 4$51 *1

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  15. (11(4QFDJGJDBUJPOT  544ZTUFNBSDIJUFDUVSFGPSUIF(4ZTUFN 541SPDFEVSFTGPSUIF(4ZTUFN 54/PO"DDFTT4USBUVN /"4 QSPUPDPMGPS(4ZTUFN 54*OUFSGBDFCFUXFFOUIF$POUSPM1MBOFBOEUIF6TFS1MBOFOPEFT 
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  16.  ᶅ(ϞόΠϧͷ઀ଓܗଶ

  17. (3"/ʙίΞωοτϫʔΫ઀ଓܗଶ  ($ &1$ /4"ʢ/PO4UBOEBSE"MPOFʣ 4"ʢ4UBOEBSE"MPOFʣ σʔλ σʔλ σʔλ σʔλ

    σʔλ σʔλ ίϯτϩʔϧ ίϯτϩʔϧ ίϯτϩʔϧ ίϯτϩʔϧ -5&/3%VBM$POOFDUJWJUZ %BUB 
 /FUXPSL %BUB 
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  18. $BSSJFS"HHSFHBUJPO%VBM$POOFDUJWJUZ  IUUQTXXXUFMFDPNIBMMOFUUXIBUTJTUIFEJ ff FSFODFCFUXFFOEDEVBMDPOOFDUJWJUZBOEDBDBSSJFSBHHSFHBUJPO $BSSJFSBHHSFHBUJPO $"  
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    $"Ͱ͸ɺ࠷େνϟωϧଳҬ෯ΑΓ΋޿͍εϖΫτϧΛ࢖༻Ͱ͖·͢ɻ ΩϟϦΞΞάϦήʔγϣϯ͸ɺϢʔβʔ͋ͨΓͷσʔλϨʔτΛ޲্ͤ͞ΔͨΊʹ࢖༻͞ΕΔٕज़Ͱ͢ɻ͜ΕʹΑΓɺ ෳ਺ͷप೾਺ϒϩοΫ͕ಉ͡ϢʔβʔʹׂΓ౰ͯΒΕ·͢ɻ %VBMDPOOFDUJWJUZ %$ 
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  19. ࢀߟʣ%VBM$POOFDUJWJUZ %$ %FGJOJUJPO 1SPUPDPM"SDIJUFDUVSF %$BOE$"$PNQBSJTPO  De fi nition for

    Dual Connectivity. • Master eNB (MeNB) is the eNB which terminates at least S1-MME or both S1-MME and S1-U • Secondary eNB (SeNB) is the eNB that is providing additional radio resources. • Master Cell Group is a group of serving cells associated with the MeNB, comprising of the PCell and optionally one or more SCells. • Secondary Cell Group is a group of serving cells associated with the SeNB, comprising of PCell and optionally one or more SCells. • MCG Bearer is a bearer whose radio protocols are only located in the MeNB to use MeNB resources only • SCG Bearer is a bearer whose radio protocols are only located in the SeNB to use SeNB resources. • Split Bearer is a bearer whose radio protocols are located in both the MeNB and the SeNB to use both MeNB and SeNB resources Dual Connectivity Protocol and Network Architecture In Dual Connectivity, the radio protocol architecture that a particular bearer uses depends on how the bearer is setup. Three bearer types exist: MCG bearer, SCG bearer and split bearer. Those three bearer types are depicted on fi gure below. IUUQTXXXUFDIQMBZPODPNEVBMDPOOFDUJWJUZEDEF fi OJUJPOQSPUPDPMBOEOFUXPSLBSDIJUFDUVSFEDBOEDBDPNQBSJTPO ̑(/4"Ͱ͸࢖ΘΕ͍ͯͳ͍
  20. ࢀߟʣ(/3"SDIJUFDUVSF%FQMPZNFOU0QUJPOT  IUUQUFDICBSOXJSFMFTTCMPHTQPUDPNHOSBSDIJUFDUVSFEFQMPZNFOUPQUJPOTIUNM ̑(/4"Ͱ͸ɺ0QUJPOYํ͕ࣜओྲྀʢ7P-5&Λআ͘ʣ Option 3 (3/3a/3x) family Then let's

    go through option 3 family, which has sub-options, so called 3, 3a, 3x. The main differences are how to transmit user plane connectivity between Radio Access Network and Core Network. We can find a bunch of explanation on TR 38.801 and TR 38.804. Split bearer concept has been introduced in Dual Connectivity at TS 37.340. For control plane, EPC is going through MeNB to the UE. For user plane, big difference between 3/3x and 3a is X1-U interface between MeNB and SgNB (3/3x) or none (3a). Option 3 is defined to use an MCG split bearer, which would require more process (investment) on the current eNB side. I am not sure how much operators would like to do with this. Option 3a is done to use a perfect Split bearer, which let operators invest on the gNB that they are going to deploy. Then option 3x is combined and modified practically to use an SCG slit bearer, which let operators save budgets on the eNB side and have benefit in utilizing the user plane through both MeNB and SgNB. Here is the summary on option 3 family below based on TR 38.801 and TR 38.804.
  21.  ᶆ(4"ͷ઀ଓखॱ

  22. (4"ͷ઀ଓखॱ  ".' 4.' H/PEF# ϥϯμϜΞΫηεˍ33$ཱ֬ ".'બ୒ /("1*OJUJBM6&.FTTBHF 
 

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  23.  3FHJTUSBUJPO (11541SPDFEVSFTGPSUIF(4ZTUFN

  24.  1%64FTTJPO&TUBCMJTI (11541SPDFEVSFTGPSUIF(4ZTUFN

  25.  ᶇ/FUXPSL4MJDJOH

  26. (࣌୅ͷωοτϫʔΫͷཁٻ৚݅  IUUQTXXXTPVNVHPKQ[email protected]QEG

  27. ωοτϫʔΫεϥΠεͷίϯηϓτ  ɹIUUQTXXXHTNBDPNGVUVSFOFUXPSLTXQDPOUFOUVQMPBET(4.""O*OUSPEVDUJPOUP/FUXPSL4MJDJOHQEG (ωοτϫʔΫΛωοτϫʔΫεϥΠγϯάͱ૊Έ߹ΘͤΔ͜ͱͰɺϏδωεΧελϚʔ͸ɺϞόΠϧ ΦϖϨʔλʔͱ߹ҙͨ͠αʔϏεϨϕϧΞάϦʔϝϯτ 4-" ʹ४ڌ͢ΔಛఆͷϏδωεཁ݅ʹ߹Θͤ ͯௐ੔͞Εͨ઀ଓͱσʔλॲཧΛڗडͰ͖·͢ɻΧελϚΠζՄೳͳωοτϫʔΫػೳʹ͸ɺσʔλ଎ ౓ɺ඼࣭ɺ஗Ԇɺ৴པੑɺηΩϡϦςΟɺ͓ΑͼαʔϏεؚ͕·Ε·͢ɻ

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  29. ωοτϫʔΫεϥΠε֓ཁ   Service Type SST Value Characteristics eMBB 1

    Slice suitable for the handling of 5G enhanced Mobile Broadband. URLLC 2 Slice suitable for the handling of ultra- reliable low latency communications. MIoT 3 Slice suitable for the handling of massive IoT. Table 5.15.2.2-1 - Standardised SST values from 3GPP TS 23.501 w /44"*4/44"*ͷू߹Λ൓өͨ͠΋ͷ 
 
 
 
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 ɹ6%.Ͱొ࿥͞ΕͨεϥΠεɻ w "MMPXFE/44"* 
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  30.  63--$TFSWJDF ".' 4.' 61' H/PEF# 4.' ".' 4.' 61'

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  32.  ᶈ(2P4

  33. (2P4֓ཁ  5G QoS Ϟσϧ͸ QoS Flowʹج͍͓ͮͯΓɺอূ͞ΕͨϑϩʔϏοτϨʔτΛඞཁͱ͢Δ QoS Flow (GBR

    QoS Flow) ͱɺอূ͞ΕͨϑϩʔϏοτϨʔτΛඞཁͱ͠ͳ͍ QoS Flow (non-GBR QoS Flow) ͷ ྆ํΛαϙʔτɻ QoS Flow͸ɺNG-U (GTP-Uτϯωϧ) Λհͯ͠ΧϓηϧԽϔομʔͰӡ͹ΕΔ QoS Flow ID (QFI) ʹΑͬͯ PDU Session಺Ͱࣝผ͞ΕΔɻ (1154/3BOE/(3"/0WFSBMM%FTDSJQUJPO The QoS architecture in NG-RAN, both for NR connected to 5GC and for E-UTRA connected to 5GC, is depicted in the Figure 12-1 and described in the following: • For each UE, 5GC establishes one or more PDU Sessions; • For each UE, the NG-RAN establishes at least one Data Radio Bearers (DRB) together with the PDU Session and additional DRB(s) for QoS fl ow(s) of that PDU session can be subsequently con fi gured (it is up to NG-RAN when to do so); • The NG-RAN maps packets belonging to different PDU sessions to different DRBs; • NAS level packet fi lters in the UE and in the 5GC associate UL and DL packets with QoS Flows; • AS-level mapping rules in the UE and in the NG-RAN associate UL and DL QoS Flows with DRBs. 
 -- 
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 QBZMPBE *EFOUJ fi FT2P4DMBTT
  34. 2*ͷ2P4ಛੑ  5BCMF4UBOEBSEJ[FE2*UP2P4DIBSBDUFSJTUJDTNBQQJOH (11544ZTUFNBSDIJUFDUVSFGPSUIF(4ZTUFN

  35. 2P4'MPXNBQQJOH  (3"/ͱ($PSF͸ɺύέοτΛద੾ͳ2P4ϑϩʔͱ%3#ʹϚοϐϯά͢Δ͜ͱͰɺαʔϏεͷ඼ ࣭ ৴པੑ΍໨ඪ஗ԆͳͲ Λอূ͢Δɻ͕ͨͬͯ͠ɺ*1ϑϩʔ͔Β2P4ϑϩʔ /"4 ΁ɺ͓Αͼ2P4 ϑϩʔ͔Β%3# "DDFTT4USBUVN

    ΁ͷஈ֊ʹϚοϐϯά͞ΕΔɻ IUUQTXXXUFDIQMBZPODPNHOSRPTBSDIJUFDUVSFRPTBUUSJCVUFBOERPT fl PX
  36.  (2P4'MPXUP%3#.BQQJOH • DRBs on air interface can have One-to-many

    relationship with the GTP-U tunnel on N3 interface at UPF. • Each QoS fl ow is mapped to a single GTP-U tunnel at N3 interface • gNB may map individual QoS fl ows to one more DRBs • A PDU session may contain multiple QoS fl ows and several DRBs but only a single N3 GTP-U tunnel. • A DRB may transport one or more QoS fl ows. • The QFI that identi fi es the fl ow is carried in an extension header on N3 in the GTP-U protocol, using DL and UL PDU session information frames • The DL and UL PDU session information frame includes a QoS Flow Identi fi er (QFI) fi eld for each packet. • The DL PDU session information frame includes the Re fl ective QoS Indicator (RQI) fi eld to indicate whether the user plane re fl ective QoS is to be activated or not. This is only applicable if re fl ective QoS is activated. IUUQTXXXUFDIQMBZPODPNHOSRPTBSDIJUFDUVSFRPTBUUSJCVUFBOERPT fl PX
  37. (2P4 2VBMJUZPG4FSWJDF "SDIJUFDUVSF  IUUQTXXXUFMFDPNIBMMOFUUHRPTRVBMJUZPGTFSWJDFBSDIJUFDUVSF

  38.  ᶉ(.&$

  39. .&$഑උʹΑΔ-PDBM#SFBL0VU  6& 3"/ 61' 61' ".' 4.' 6TFS1MBOF $POUSPM1MBOF

    1$' / / / / / / / / / 6%. "64' / / / /44' / / / 6%3 %BUB 
 /FUXPSL / -PDBM 
 %BUB 
 /FUXPSL / / / .&$ .&$ 61' 14" 14" *61' / UVQMF৘ใΛݩʹ 
 ಛఆͷ௨৴ͷΈ෼ذ͢Δٕज़ 61-*/,$MBTTJ fi FS 6-$- /&' "' "1*ͷ࣮ߦ Application Function 
 influence on traffic routing
  40. &54*.&$BOE(  IUUQTQPSUBMFUTJPSH1PSUBMT5#QBHFT.&$%PDT&54*.&$1VCMJD[email protected](FOFSJDQEG

  41. 

  42. 

  43. EPDPNP.&$ͱ͸ʁ  EPDPNP.&$͸ɺ(ͷՄೳੑΛ޿͛Δɺࠃ಺ॳͷʮ.&$ʯαʔϏεͰ͢ɻ 
 (ͷಛ௕Λ࠷େݶʹ׆༻Ͱ͖Δʮ.&$ʯʹΑΓɺϦϞʔτΛΑΓϦΞϧʹɺ 
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