在EPS session management中,
1.UE發起一個bearer resource allocation procedure, 網路會回覆 activate dedicated EPS bearer context request或者modify EPS bearer context request,請問網路是根據什麼來決定以哪種方式回覆呢? 這個表是從TS 24.301中擷取下來
Table 8.3.8.1: BEARER RESOURCE ALLOCATION REQUEST message content IEI
| Information Element
| Type/Reference
| Presence
| Format
| Length
|
| Protocol discriminator
| Protocol discriminator 9.2
| M
| V
| 1/2
|
| EPS bearer identity
| EPS bearer identity 9.3.2
| M
| V
| 1/2
|
| Procedure transaction identity
| Procedure transaction identity 9.4
| M
| V
| 1
|
| Bearer resource allocation request message identity
| Message type 9.8
| M
| V
| 1
|
| Linked EPS bearer identity
| Linked EPS bearer identity 9.9.4.6
| M
| V
| 1/2
|
| Spare half octet
| Spare half octet 9.9.2.9
| M
| V
| 1/2
|
| Traffic flow aggregate
| Traffic flow aggregate description 9.9.4.15
| M
| LV
| 2-256
|
| Required traffic flow QoS
| EPS quality of service 9.9.4.3
| M
| LV
| 2-10
| 27
| Protocol configuration options
| Protocol configuration options 9.9.4.11
| O
| TLV
| 3-253
| C-
| Device properties
| Device properties 9.9.2.0A
| O
| TV
| 1 |
是根據Linked EPS bearer identity所帶的值嗎? 如果已經存在一個default EPS bearer的EBI=5,如果UE發起這個request所帶的Linked EBI=5的話,那網路就回覆modification,如果帶的Linked EBI是一個沒有被使用過但又是有效值的話,網路就回覆activate Dedicated EPS bearer,還是說是由Traffic flow aggregate所描述的TFT operation來決定!?
2.UE發起一個bearer resource modification procedure, 網路會回覆 activate dedicated EPS bearer context request或者modify EPS bearer context request或者deactive EPS bearer context request,請問網路什麼情況下會回覆deactive? 拜讀了版主另一篇"EPS會話流程"的帖子裡面提到,透過TFA description所帶的TFT operation "delete packet filters form existing TFT"來表示"釋放乘載",指的是deactive EPS bearer?? 如果只是刪除packet filter應該不至於會deactive EPS bearer吧!? 小弟觀念可能還不甚清晰,還望各位先進能給予指教,謝謝。
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