CN Domain Identity

Most of UMTS Cell support both CS and PS communication, but there are some cases where a cell support or allow only CS or PS communication.

How Network can inform UE of its CN (Core Network) capability ?

The first level information about CN capability is sent to UE by System Information Type 1.

Would this capability influence on Registration protocol sequence ?  

Yes. There are roughly three different types of registration sequence being used for each of CN configuration.

Of course, in real network you would see various variation.. but these three type of sequence would give you a good template for each case.

System Information Type 1

Following SIB1 shows the case where the cell support both CS and PS capability. In this case, usually Registration procedure < Type 1 > in case of Non Combined (NMO II) registration or < Type 3 > in case of Combined (NMO I) is used.

Following SIB1 shows the case where the cell support PS capability only. In this case, usually Registration procedure < Type 3 > is used.

Following SIB1 shows the case where the cell support CS capability only. In this case, usually Registration procedure < Type 2 > is used.

Registration Sequence

< Type 1 >

1) RRC: RRC Connection Request

2) RRC: RRC Connection Setup

3) RRC: RRC Connection Setup Complete

4) RRC: initialDirectTransfer + MM: Location Updating Request

5) RRC : downlinkDirectTransfer + MM:Authentication Request

6) RRC: initialDirectTransfer + GMM: Attach Request

7) RRC : uplinkDirectTransfer + MM:Authentication Response

8) RRC : Security Mode Command

9) RRC : Security Mode Complete

10) RRC : downlinkDirectTransfer + MM:Identity Request

11) RRC : uplinkDirectTransfer + MM:Identity Response

12) RRC : downlinkDirectTransfer + MM:Location Updating Accept

13) RRC : uplinkDirectTransfer + MM:TMSI Reallocation Complete

14) RRC : downlinkDirectTransfer + GMM: AuthenticationAndCipheringRequest

15) RRC : uplinkDirectTransfer + GMM: AuthenticationAndCipheringResponse

16) RRC : Security Mode Command

17) RRC : Security Mode Complete

18) RRC : downlinkDirectTransfer + GMM:Identity Request

19) RRC : uplinkDirectTransfer + GMM:Identity Response

20) RRC : downlinkDirectTransfer + GMM:Attach Accept

21) RRC : uplinkDirectTransfer + GMM:Attach Complete

22) RRC : RRC Connection Release

23) RRC : RRC Connection Release Complete

< Type 2 >

1) RRC: RRC Connection Request

2) RRC: RRC Connection Setup

3) RRC: RRC Connection Setup Complete

4) RRC: initialDirectTransfer + MM: Location Updating Request

5) RRC : downlinkDirectTransfer + MM:Authentication Request

6) RRC : uplinkDirectTransfer + MM:Authentication Response

7) RRC : Security Mode Command

8) RRC : Security Mode Complete

9) RRC : downlinkDirectTransfer + MM:Identity Request

10) RRC : uplinkDirectTransfer + MM:Identity Response

11) RRC : downlinkDirectTransfer + MM:Location Updating Accept

12) RRC : uplinkDirectTransfer + MM:TMSI Reallocation Complete

13) RRC : RRC Connection Release

14) RRC : RRC Connection Release Complete

< Type 3 >

1) RRC: RRC Connection Request

2) RRC: RRC Connection Setup

3) RRC: RRC Connection Setup Complete

4) RRC: initialDirectTransfer + GMM: Attach Request

5) RRC : downlinkDirectTransfer + GMM: AuthenticationAndCipheringRequest

6) RRC : uplinkDirectTransfer + GMM: AuthenticationAndCipheringResponse

7) RRC : Security Mode Command

8) RRC : Security Mode Complete

9) RRC : downlinkDirectTransfer + GMM:Identity Request

10) RRC : uplinkDirectTransfer + GMM:Identity Response

11) RRC : downlinkDirectTransfer + GMM:Attach Accept

12) RRC : uplinkDirectTransfer + GMM:Attach Complete

13) RRC : RRC Connection Release

14) RRC : RRC Connection Release Complete