Signaling theory merupakan sinyal-sinyal informasi yang dibutuhkan oleh investor untuk mepertimbangkan dan menentukan apakah para investor akan menanamkan sahamnya atau tidak pada perusaha…Full description
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04_RA41334EN50GLA1_LTE Paging and RRC Connection
RA47055EN16AGLA0 Basic Signaling
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RADIO RESOURCE CONTROL (RRC) The RRC Connection is a dedicated connection used for control signaling between WCDMA RAN and one UE. The establishment is always initiated by the UE, due t o some signaling procedure to be run t owards the CN (e.g. Periodic Location Area update), or user action (e.g. service request) or paging from the CN. The WCDMA RAN always establishes the RRC Connection on a dedicated channel (DCH). A RRC connection between the UE and RNC c onsists of three or four Signaling Radio Bearers (SRB1, SRB2, SRB3, and SRB4. SRB4 is not established at handover from GSM to UMTS)
SETTING UP THE RRC CONNECTION OVER THE AIR INTERFACE The steps taken to establish the RRC c onnection between between the UE and Serving Radio Network Controller (SRNC).
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After the NAS event in t he UE (for example a page or user action) a RRC Connection Request is sent from the UE to the CN using a physical Random Access Channel (RACH). Upon reception of this message the following algorithms will take action. a. The Power Control algorithm in the SRNC sets t he initial downlink (DL) Dedicated Channel (DCH) transmission transmission power. b. The Iub and Uu Timing scheduling algorithms calculate the channel timing parameters. c. The Admission Control algorithm checks if the new Radio Link can be allowed in the cell. d. The Code Control algorithms allocate the UL scrambling code and DL channelization code.
Comment [s1]: RRC Connection Request UE – RNC on DCH
Comment [s2]: RNC: Different Algorithms 1. Power Control (DCH) 2. Timing Scheduling 3. Admission Control. 4. Scrambling & Channelization Code
Setting up the RRC over the Air Interface
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The SRNC will send a Radio L ink Setup Request message to the RBS with the required resources . The binding identifier and transport layer address for the AAL2 connection are allocated.
Comment [s3]: RNC to RBS: Radio Link Setup Request. 1.Binding Identifier. 2.AAL2 connection address.
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The RBS calculates link characteristic parameters from the received UL/DL Transport Format Combination Set (TFCI)/Transport Format Set (TFS) information.
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The RBS will return a Radio Link Setup Response to the SRNC .
Comment [s4]: RBS to RNC: Radio Setup Link
If the response is positive, the tr ansport bearer (AAL2 connection) needed for signaling is set up over Iub i nterface and synchronized .
Comment [s5]: RNC: AAL2 connection setup
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Response after evolutions of different parameters settings received from RNC
over Iub
Once the transport channel is synchronized the RBS will start to transmit the downlink (DL) Dedicated Physical Channel (DPCH) and start to receive the uplink (UL) DPCH. Supervision of the Radio L ink Set (RLS) will also start .
Comment [s6]: RBS: Transport channel Sync
The SRNC will send a RRC Co nnection Setup message to request the UE to change to connected state (Cell_DCH) using the Secondary Common Physical Channel (S_CCPCH)
Comment [s7]: RNC to UE: RRC connection
over UL|DL Dedicated Physical channels.
setup message. State = Connected Stat e (Cell_DCH)
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After reception of DL DPCH the UE will start to transmit the UL DPCH. When the RBS can receive the UL DPCH t he Layer 1 (L1) c onnection is synchronized. The RBS will indicate this to the SRNC by sending a Radio link restore indication message. The UE will send a RRC connection setup complete message which contains the UE capabilities to the SRNC using t he newly established Signaling Radio Bearer SRB. This information is used by the RAB establishment procedure , UE Security Handling and by t he Channel Switching function. The RRC connection is now established on the air interface and the UE is now said to be in SRB CELL_DCH state and will be using an uplink and downlink Dedicated Physical control (DPCCH) and data (DPDCH) Channel .
Comment [s8]: UE: Start UL DPCH to RBS = L1 connection synchronized
Comment [s9]: RBS to RNC = Radio Link Restore Message.
Comment [s10]: UE to RNC: RRC Connection setup COMPLETE Message ovr new SRB + UE capabilities, THIS INFO FURTHER USED FOR RAB estb.
SETTING UP THE IU CONTROL PLANE CONNECTION The second part of a Signaling Connection consists of the Iu c ontrol plane connection between WCDMA RAN and a Core Network (CN) domain. The setup of this connection and thus the first Signaling Connection, followed by the procedure Report of Common Id where a permanent NAS UE identity(IMSI) is received by the SRNC from the CN, is shown in Figure
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The establishment is initiated by the reception of a RRC message that c ontains the NAS message that originally triggered the Signaling Connection setup.
Comment [s11]: UE to RNC: RRC message that contains NAS message
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Upon reception, the SRNC registers the connection and allocates an identifier for the Iu control plane connection.
Comment [s12]: SRNC: Allocate an ID for IU control plane connection
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The SRNC uses the Signaling Connection Control Part (SCCP) service to set up an Iu control plane connection to the CN and sends the Radio Access Network Application Part (RANAP) message to the CN. a. This RANAP message includes the UE NAS message. b. Current location information of the UE c. The Iu control plane connection identifier.
Comment [s13]: RNC to CN: Uses SCCP & RANAP message to setup Iu control plane connection. 1.UE NAS message. 2.Current Location of UE. 3.Iu control plane ID.
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After the SRNC has received a confirmation from CN that the c onnection has been setup, both nodes are ready to send and receive data in SCCP-connection oriented mode
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If a RANAP DIRECT TRANSFER message was included in the SCCP C onnection Confirm messages, the SRNC forwards the NAS message to the U E. At this stage the UE has both a RRC Connection to WCDMA RAN and an Iu control plane connection between WCDMA RAN and CN, thus a Signaling Connection is established and the UE will now be in ‘CELL_DCH’ state.
Comment [s14]: SRNC: Connection setup Confirmation from CN.
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Soon after the establishment of the Signaling Connection, the CN sends a RANAP Common Id messages (if not already included in the SCCP connection confirmation messages) to inform the SRNC about the permanent NAS UE Identity (i.e. IMSI).
Comment [s15]: CN to SRNC: RANAP common id message to inform the SRNC about IMSI.
RAB ESTABLISHMENT The existing Signaling Connection is used to carry the Non Access Stratum (NAS) call setup message between the CN and UE. The RAB establishment is done in t wo parts, the first is t he setup of an Iu bearer and the second is the setup o f the Radio Bearer (RB).
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A ‘RAB ASSIGNMENT REQUEST’ is received from the CN indicating the RAB ID to be ‘speech’. The SRNC determines the new Radio Connection configuration (taking into account the existing one) and also check the UE capabilities (to check if the new configuration can be supported by the UE).
Comment [s16]: CN to SRNC: RAB assignment request with RAB Id = Speech.
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The SRNC initiates the setup of an AAL2 connection for the Iu bearer.
SRNC check Radio Connection configuration & UE capabilities.
Comment [s17]: SRNC: Setup AAL2 connection
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The UE is ordered to setup a new Radio Bearer (RB). In the SRNC the MAC shall be reconfigured without waiting for the RLC acknowledge. When finished the UE acknowledges the successful RB setup and the UE will be in CELL_DCH state.
over Iu for user traffic.
Comment [s18]: SRNC to UE: RB setup. SRNC setup MAC over Iu. RAB established.
