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Radio Channel Introduction

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Radio Channel Introduction
                        Prepared by:

             Viswajit Kumar Dutta
                    RNP Engineer
                                                             www.huawei.com
              mail: viswajitkd@huawei.com




 HUAWEI TECHNOLOGIES CO., LTD.    Huawei Confidential
                                 Contents



                                Overview


                                Service Area and Number Planning


                                Radio channel




HUAWEI TECHNOLOGIES CO., LTD.        Huawei Confidential   Page 2
                                Radio Interface


                                                                                                    PSTN
                                                            Another MSC                             ISDN
      Um

                                BSC
                   BTS
MS
                                                     A interface
                    A-bis                                                                     MSC
                    interface

     Um                                                                            MAP interface




                                                                          HLR/AUC/LR
MS
                                                              OMC                                    SMC



HUAWEI TECHNOLOGIES CO., LTD.         Huawei Confidential                 Page 3
Hierarchical Structure of Um Interface

                                             Communication management (CM)
     Network application layer (L3)
                                             Mobility and security management
                                                            (MM)

                                             Radio resources management (RR)




           Data link layer (L2)
                                                  Integrated management




                          RACH        BCCH   AGCH/PCH        SDCCH        SACCH   TCH      FACCH




                                              TCH0 TCH1 TCH2 。。SACCH 。。TCH23 IDL
          Physical link layer (L1)
                                                               Multi-frame



HUAWEI TECHNOLOGIES CO., LTD.                Huawei Confidential                  Page 4
           Service Area and Number Planning




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 5
                                Objectives


      On completion of this section
      you will be able to:


                       Identify the system identification number

                       Identify the of mobile identification number


                        Identify the cell identification number



HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential   Page 6
                                Service Area
                                System area
     PLMN service area
     PLMN service area                          PLMN service area
          MSC service area...                      MSC service area...

            Location area...
           Base station area...
                                                         Location area...
                                                                            ......
                                                     Base station area...

                                                           Radio cell
               Radio cell

                 ......                                     ......



HUAWEI TECHNOLOGIES CO., LTD.      Huawei Confidential            Page 7
                      MSC/VLR Number


            CC                        NDC                 LSP

                                MSC/VLR number

The format is CC+NDC+LSP
CC:Country Code.
For example: The CC of China is "86".

NDC:National Destination Code.
For example: The NDC of China Mobile is 139、138、137、136、135.

LSP(locally significant part): is defined by Telecom operator.
For example: 86-139-00311




HUAWEI TECHNOLOGIES CO., LTD.      Huawei Confidential   Page 8
                            HLR Number


       The format is:CC+NDC+H0 H1 H2 H3 0000.
       CC:Country Code.
       For example: The CC of China is "86".

       NDC:National Destination Code.
       For example: The NDC of China Mobile is
       139、138、137、136、135.

       H0H1H2H3 is defined by Telecom operator.
       For example: 86-139-0666-0000.



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 9
                                      LAI

         MCC                       MNC                   LAC

                         Location Area Identification


The LAI is the international code for a location area.


  MCC:Mobile Country Code,It consists of 3 digits .
         For example: The MCC of China is "460"
  MNC:Mobile Network Code,It consists of 2 digits .
         For example: The MNC of China Mobile is "00"
  LAC: Location Area Code,It is a two bytes BCD code (hex).
         The value 0000 and FFFF is invalid.
  For example: 460-00-0011




 HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential   Page 10
                                    CGI

 CGI: Cell Global Identification


     The CGI is a unique international identification
     for a cell
     The format is LAI+CI
     LAI: Location Area Identification
     CI:Cell Identity. This code uses two bytes
     BCD code (hex) to identify the radio cells
     within an LAI.
     For example : 460-00-0011-0001



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 11
                                   BSIC
 BSIC(Base Station Identification Color Code)

              NCC                                      BCC

                                BSIC

NCC: PLMN network color code. It comprises 3
bit. It allows various neighboring PLMNs to be
distinguished.
BCC: BTS color code. It comprises 3 bit. It allows
distinction
between different radio frequency channels
using the same frequency in neighboring cells.


HUAWEI TECHNOLOGIES CO., LTD.    Huawei Confidential         Page 12
                                MSISDN

            CC                       NDC                    SN
                                        National (significant)
                                          Mobile number
                         Mobile station international
                                ISDN number


CC: Country Code. For example: The CC of China is "86".
NDC:National Destination Code. For example: The NDC of China
Telecom is 139, 138, 137, 136, 135.
SN: Subscriber Number. Format:H0 H1 H2 H3 ABCD
Example: 86-139-0666-1234



HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential     Page 13
                                   IMSI
                      Not more than 15 digits
        3 digits                2 digits

          MCC                    MNC                     MSIN
                                                NMSI
                                   IMSI

MCC:Mobile Country Code,It consists of 3 digits .
      For example: The MCC of China is "460"。
MNC:Mobile Network Code,It consists of 2 digits .
      For example: The MNC of China Telecom is "00"。
MSIN:Mobile Subscriber Identification Number. H1H2H3 S ABCDEF
       For example: 666-9777001
NMSI:National Mobile Subscriber Identification,MNC and MSIN form it
together.
For Example of IMSI : 460-00-666-9777001



HUAWEI TECHNOLOGIES CO., LTD.      Huawei Confidential      Page 14
                                 TMSI


 TMSI: Temporary Mobile Subscriber Identification)


 The TMSI is assigned only after successful subscriber
  authentication.
 The VLR controls the allocation of new TMSI numbers and
  notifies them to the HLR.
 TMSI is used to ensure that the identity of the mobile
  subscriber on the air interface is kept secret.
 The TMSI consists of 4 bytes( 8 HEX numbers) and
  determined by the telecom operator.




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 15
                                  IMEI

IMEI: International Mobile Station Equipment Identification


                  TAC           FAC           SNR      SP

                                      IMEI

  TAC: Type approval code. It is administered by the type
        approval center.
  FAC: Final assembly code.It is administered by the
        manufacturer.
  SNR:Serial number.It is issued by the manufacturer of the MS.
  SP:Not used.


HUAWEI TECHNOLOGIES CO., LTD.    Huawei Confidential   Page 16
                            MSRN/HON


 MSRN: Mobile Subscriber Roaming Number
 HON: Hand-over Number

 The MSRN is used to route the call to the MSC which MS is
  currently located.
 The HON is used by the MSC-A to set up a connection to the
  MSC-B during handover process
 Usually, MSRN and HON share the same numbering plan.
 The format is CC+NDC+individual number. CC and NDC is the
  same as that of MSISDN. The individual number is taken from a
  pool of numbers specially reserved for MSRN.




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 17
                                 RSZI

      RSZI (Regional Subscription Zone Identity)

                                RSZI

           CC          NDC                            ZC

                                           Zone Code, Two octets


      CC、NDC:       same as that of MSISDN
      ZC(Zone Code): is designed by telecom operator and
                    stored in the VLR.



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential    Page 18
Radio Channel
                           Channel Concept

In GSM network, there are two types of Channel:
(1) Physical channel (2) Logical Channel
(1) Physical channel: The are eight physical channels per
carrier. Physical channel can be used to transmit speech , data or
signaling information.

(2) Logical Channel: A physical channel may carry different
messages, depending on the information which are to be sent.
These messages are called Logical Channels.
Example : On one of the physical channels used for Traffic. The
Traffic itself is transmitted using a Traffic Channel Message.




 HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 20
                                           Logical Channel Type

       • GSM900 and DCS1800 have the same logical channel
         category
                                                                 Logical channel




                                  Common channel                                                     Dedicated channel
                                      (CCH)                                                                (DCH)




      Broadcast control channel             Common control channel                                                       Voice channel
              (BCCH)                              (CCCH)                           Control channel                           (TCH)




FCH        SCH         BCCH               PCH       AGCH       RACH                                   FACCH                 TCH/F             TCH/H
                                                                            SDCCH
                       (system information)

                                                                                                                               TCH/9.6F
                                                                                            SACCH
                                                                                                                               TCH/ 4.8F, H
                                                                                                                               TCH/ 2.4F, H


        HUAWEI TECHNOLOGIES CO., LTD.                        Huawei Confidential                      Page 21
               Downlink Logical Channel

                                   FCCH
    Common          BCCH           SCH
    Channel                        BCCH
                                   PCH
                    CCCH
                                   AGCH




                                 SDCCH
   Dedicated        DCCH         SACCH
   Channel                       FACCH
                                 TCH/F
                      TCH
                                 TCH/H




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 22
            Downlink Logical Channel

                                 FCCH
 Common           BCCH           SCH
 Channel                         BCCH
                                 PCH
                 CCCH
                                 AGCH




                                SDCCH
Dedicated        DCCH           SACCH
Channel                         FACCH
                                TCH/F
                   TCH
                                TCH/H




HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential   Page 23
                Uplink Logical Channel


                                                                   Common
                                                      CCCH
                                                                   channel
                                        RACH




                                       SDCCH
                                       SACCH          DCCH         Dedicated
                                                                   channel
                                       FACCH

                                        TCH/F
                                                       TCH
                                        TCH/H



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential      Page 24
                Uplink Logical Channel


                                                                   Common
                                                      CCCH
                                                                   channel
                                        RACH




                                       SDCCH
                                       SACCH          DCCH         Dedicated
                                                                   channel
                                       FACCH

                                        TCH/F
                                                       TCH
                                        TCH/H



HUAWEI TECHNOLOGIES CO., LTD.   Huawei Confidential      Page 25
                 The function of each Logical Channel:
  Logical         Direction                BTS                       MS
  Channel

              Down Link ,       Transmit a Carrier        Identifies BCCH carrier
    FCH       Point to          frequency                 by the carrier frequency
              Multipoint                                  and synchronizes with
                                                          the frequency.
    SCH       Down Link ,       Transmit TDMA frame       Synchronizes with the
              Point to          & Base station BSIC.      frame structure with a
              Multipoint                                  particular cell & ensure
                                                          that

   BCCH       Down Link ,       Broadcast some            Receives LAI and will be
              Point to          general information       signed to the network as
              Multipoint        like LAI, max out put     part of the location
                                power allowed in a cell   updating procedure. MS
                                & the identity of BCCH    sets the out put power
                                carrier for neighboring   according to the
                                cell.                     strength of BCCH.




HUAWEI TECHNOLOGIES CO., LTD.     Huawei Confidential      Page 26
  Logical Channel         Direction                  BTS                   MS

                      Down Link ,          Transmit     paging    After certain interval
        PCH           Point to point.      message contains       MS listen to the
                                           the         identity   paging message . If
                                           number     of   the    it identifies it’s own
                                           mobile                 subscriber it will
                                           subscribers    that    respond.
                                           the        network
                                           wishes to connect.
        RACH          Up Link , Point      Receive request        Answer paging
                      to Multipoint        from MS for            message on the
                                           signaling channel.     RACH by requesting
                                                                  a signaling channel.
        AGCH          Down Link ,          Assign a signaling     Receives Signaling
                      Point to point       channel ( SDCCH )      channel assignment
                                           for the MS.            ( SDCCH )




HUAWEI TECHNOLOGIES CO., LTD.      Huawei Confidential          Page 27
 Logical         Direction                 BTS                        MS
 Channel
             Up & Down ,        The BTS switches to      The MS switches to the
 SDCCH       Point to point.    the assigned SDCCH.      assigned SDCCH. Call
                                The     call    setup    setup is performed. The
                                procedure           is   MS       receives     TCH
                                performed    in   idle   assignment information. (
                                mode.     The    BSC     Carrier & Time slot )
                                assigns TCH.
 SACCH       Up & Down ,        Instructs the MS the     Sends            averaged
             Point to point     transmitting power to    measurements on its BTS
                                use      and     gives   (Signal     strength    &
                                instructions on timing   Quality) and neighboring
                                advance.                 BTSs (Signal strength).
                                                         The MS continues to use
                                                         SACCH for this purpose
                                                         during a call.
 FACCH       Up & Down ,        Transmit handover        Transmit handover
             Point to point     information              request.


HUAWEI TECHNOLOGIES CO., LTD.      Huawei Confidential      Page 28
          “off” state   Search for frequency correction burst
                                                                          FCCH
                        Search for synchronization sequence               SCH
                        Read system information                           BCCH

                                                                          PCH
                        Listen paging message
          idle mode
                        Send access burst                                 RACH
                        Wait for signaling channel allocation             AGCH

         dedicated      Call setup                                        SDCCH
         mode           Assign traffic channel
                                                                          SDCCH
                        Conversation
                                                                          TCH
         idle mode      Call release                                      FACCH




HUAWEI TECHNOLOGIES CO., LTD.           Huawei Confidential     Page 29
                 Call Setup Flow
                           MS                  BTS                       BSC               MSC
                                Channel_req          Channel_Required
                                                     Channel_Active
                                                    Channel_Active_Ack
                                     IMMEDIATE ASSIGN COMMAND
                                First SABM       Establish_IND(CM Service Req)
                                                                           CR(Complete_L3_information)
                                                                                   CC
                                                  CM Service Accepted
                                                  Setup
                                                  Call Processing
                                                Channel_Active                 Assignment_Req
                                                   Channel_Active_Ack
                                     ASSIGNMENT COMMAND
                                First SABM           Establish_IND
SABM: Set asynchronous
balanced mode command--                  ASSIGNMENT CMP
Initial access frame                                                           Assignment_CMP
                                                       Alerting
UA: Unnumbered
acknowledgement response                               Connect
                                                      Connect Ack
                                                 Conversation
                                                        Disconnect
                                                        Release
                                                     Release Complete
                                                                               Clear_CMD
                                                                               Clear_CMP


       HUAWEI TECHNOLOGIES CO., LTD.            Huawei Confidential             Page 30
Thank you
www.huawei.com

				
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Description: Overview Service Area and Number Planning Radio channel