Rrc connection setup in lte

Following is an example that I get as of Jul This is only an example based on availble ASN implementation, it may not accurately reflect real implementation. Don't try to blindly copy these elements as it is. I would not work. UE Capability Information. Item 0. BandCombinationParameters-r 2 items. Item 1. It has following items. CA Bandwidth Class. It means that total aggregated RB should be less than Following shows some example cases which is allowed and not allowed configuration.

So this is allowed. Network specifies an IP for the UE here. The example shown in this page is from very early LTE UE, so it may be oversimplified comparing to more recent device. I will keep posting more examples of this message from various different conditions. Don't try to look into all the details since this message is one of the most complicated message in LTE.

Just try to understand overall structure and compare the tree map shown above and the real messages shown below. Probably it will take several month to understand all the details of these elements, so don't be so hurry. Whenever you study a little bit further details of the topics in the tree diagram shown above, open up this section and see the details under the topics you studied.

If you fully understand all the information elements shown below, you can say you mastered the LTE. Again don't try to understand all of these at once. It will just raise your blood pressure. Just look through these items as often as possible and get familiar with the overall structure first. Even though the decoded message shown above looks very complicated already, it is not fully decoded. It shows only RRC part decode. If you decode the NAS part in this message, you will get the following contents.

Octet 4 - Octet If you see the contents shown above, you would see "ESM message container contents", which can be further decoded as below. The IE information element marked in blue would be the most important IEs for UE connection to data service application.

There is one important thing you have to know at this point. It is about how to specify PDN address. Following three examples can be self sufficient I hope For a little bit further details for IPv6, refer to IPv6 page. NAS part has pretty complicated structure since it is Piggybacked multiple times.

Same as step 6, but establishment cause gets different as shown below. But you would see some difference between this message and the message at step You don't see any 'Attach Accept' part because you already went through 'attach' process during the registration.

That's why you don't have to recreate the default EPS bearer at this step. MAC Hdr. Tr CH. BCCH 0. BCH 0. BCCH 1. DL SCH 0. DL SCH 1. DRB 0. DRB 1. DRB 2. UL SCH 0. SIB2,3 and others. To confirm Msg3 Reception. To decode CR in UE. Thnkx Smb. Thanks Shaboxes. Since you will be with your pet almost all the time, you might be tempted to feed him extra just to keep him happy. Very nice post, i certainly love this website, keep on it Blogtalkradio. Very nice post, i certainly love this website, keep on it Kuwestions.

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Glock 17 for sale cheap online without License overnight delivery glockgunstore. Why we need random value or TMSI? Because there is a possibility that Temp-CRNTI has been assigned to more than one UEs in previous step, due to multiple requests coming at same time Collision scenario explained later Connection establishment cause: This shows the reason why UE needs to connect to network.

Remember the SRB2 is always configured after the security activation. It is not possible in this blog to explain all the information carried by this message but an example message taken from test network is shown below. The message contains following information.

For more LTE call flows, please check out this tool. KP February 3, at AM. Unknown February 5, at AM. Unknown November 8, at AM. KP November 10, at AM. Unknown October 29, at PM. KP January 17, at AM. Neha October 17, at PM. Anonymous April 27, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom.