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LTE: What is the purpose of having Release Access Bearer Procedure?

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LTE: What is the purpose of having Release Access Bearer Procedure?
posted Oct 31, 2014 by anonymous

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1 Answer

+2 votes

When an UE switches it's connection state from RRC-connected to RRC-IDLE, eNodeB informs to MME by using S1-AP based "UE Context Release Request" message MME. As soon as MME receives this message from eNodeb with cause "due to user inactivity", it initiates "Release Access bearer" procedure with SGW.

The objective of sending this message is to just inform SGW that UE is not any more at that eNodeB. Please release the associated with locally and if any data comes from the external network for that UE, just inform me(MME).

answer Nov 1, 2014 by Ganesh
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+2 votes

Probably is newbie question -
What is the purpose of default bearer in LTE and why this concept is missing in UMTS?

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Is it possible to release default bearer without releasing dedicated bearer? Please suggest?

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Under what scenario(s) is the UE-initiated dedicated bearer request implemented? This is discussed at 3GPP TS 24.301 at section 6.5.3 and 3GPP TS 23.401 at section 5.4.5. I understand that the UE can initiate a dedicated bearer with specific QoS, but am unsure when this occurs as a practical matter. If there were specific applications that required the UE to request a dedicated bearer, that would be helpful to know.

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