This is continuation from my previous article. Please go through from my previous article.

Here’s the LTE Attach Procedure Call Flow, broken down into steps, derived by 3GPP. The UE initiates the attach procedure by transmitting an attach request to the eNodeB. The eNodeB derives the MME from the RRC parameters carrying the old GUMMEI and the indicated Selected Network. If the UE identifies itself with GUTI and the MME has changed since detach, the new MME uses the GUTI received from the UE to derive the old MME/SGSN address, and send an Identification Request to the old MME/SGSN to request the IMSI. If the UE is unknown in both the old MME/SGSN and new MME, the new MME sends an Identity Request to the UE to request the IMSI. The UE responds with Identity Response (IMSI). If no UE context for the UE exists anywhere in the network, if the Attach Request (sent in step 1) was not integrity protected, or if the check of the integrity failed, then authentication and NAS security setup to activate integrity protection and NAS ciphering are mandatory.

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The ME Identity shall be retrieved from the UE. If the UE has set the Ciphered Options Transfer Flag in the Attach Request message, the Ciphered Options i.e. PCO or APN or both, shall now be retrieved from the UE. If there are active bearer contexts in the new MME for this particular UE (i.e. The UE re-attaches to the same MME without having properly detached before), the new MME deletes these bearer contexts by sending Delete Session Request (LBI) messages to the GWs involved. If the MME has changed since the last detach, or if there is no valid subscription context for the UE in the MME, the MME sends an Update Location Request message to the HSS.

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The HSS sends Cancel Location (IMSI, Cancellation Type) to the old MME. If there are active bearer contexts in the old MME/SGSN for this particular UE, the old MME/SGSN deletes these bearer contexts by sending Delete Session Request (LBI) messages to the GWs involved. The HSS acknowledges the Update Location message by sending an Update Location Ack message to the new MME. For an Emergency Attach situation, the MME applies the parameters from MME Emergency Configuration Data for the emergency bearer establishment performed in this step and any potentially stored IMSI related subscription data are ignored by the MME. The Serving GW creates a new entry in its EPS Bearer table and sends a Create Session Request message to the PDN GW indicated by the PDN GW address received in the previous step.

If dynamic PCC is deployed and the Handover Indication is not present, the PDN GW performs an IP-CAN Session Establishment procedure. The PGW creates a new entry in its EPS bearer context table and generates a Charging Id. If the MS Info Change Reporting Action (Start) or the CSG Information Reporting Action (Start) are received for this bearer context, then the SGW stores this for the bearer context and the SGW reports to that PGW whenever a UE’s location and/or User CSG information change occurs that meets the PGW request. If an APN Restriction is received, then the MME shall store this value for the Bearer Context and the MME shall check this received value with the stored value for the Maximum APN Restriction to ensure there are no conflicts between values. The eNodeB sends the RRC Connection Reconfiguration message including the EPS Radio Bearer Identity to the UE, and the Attach Accept message will be sent along to the UE.

I am hoping somebody can help me with my syntax for this DLookUp. I have tried several versions, and received several different errors, the most frequent being, 'The expression you entered has an invalid string.' I should add that I am not a developer, but rather a crazy entrepreneur with a low budget who. MS Access General Information MS Access VBA Programming 2 Comments. A common question in many a newsgroup/forum is how can I perform a DLookup with more than one criteria? Post navigation. What happened to Microsoft’s Newgroups/Forum. MS Access – Splitting and Deploying. I have 2 tables in my DB. One called Manufacture and the other Product. The Manufacture table has 2 fields: Number Name The Product table has 3 fields: Number Name Manufacture_Number What. Dlookup access multiple criteria.

The UE sends the RRC Connection Reconfiguration Complete message to the eNodeB. The eNodeB sends the Initial Context Response message to the new MME. The UE sends a Direct Transfer message to the eNodeB, which includes the Attach Complete message. The eNodeB forwards the Attach Complete message to the new MME in an Uplink NAS Transport message. Upon reception of both, the Initial Context Response message in step 20 and the Attach Complete message in step 22, the new MME sends a Modify Bearer Request message to the Serving GW.