Pembelajaran 5G (NR) RAN - Kegagalan permintaan jalur selama penyerahan

Dalam sistem 5G, a Path Switch Request (PATH SWITCH REQUEST) is a request for the terminal (UE) to establish a signaling connection with the 5GC and, if applicable,request the downlink of the NG-U transport bearer to be switched to a new service node (permintaan downlink dari operator transportasi NG-U untuk disalurkan ke node layanan baru). This request can fail for various reasons; 3GPP defines it in TS 38.413 sebagai berikut.

I. Path Request Operasi Gagal

Seperti yang ditunjukkan pada Gambar 8.4.4.3-1 di bawah, a request failure is typically responded to by the AMF after the NG-RAN node issues a "PATH SWITCH REQUEST".

II. Request operation failure scenarios are typically as follows:

• If the 5GC fails to switch the downlink termination point of the NG-U transport bearer to the new (service) termination point for all PDU session resources, jika 5GC gagal untuk beralih downlink termination point of the NG-U transport bearer to the new (service) termination point for all PDU session resources, jika 5GC gagal untuk beralih downlink termination point of the NG-U transport bearer to the new (service) termination point for all PDU session resources,the AMF shall send a PATH SWITCH REQUEST FAILURE message to the NG-RAN node (dalam bahasa Inggris).

• The NG-RAN node shall release the corresponding QoS flows and consider the PDU Sessions indicated in the PDU Session Resource Release List IE contained in the PATH SWITCH REQUEST FAILURE message as released.

• The corresponding cause value for each released PDU Session is contained in the Path Switch Request Unsuccessful Transfer IE in the PATH SWITCH REQUEST FAILURE message.

III. Meminta Operasi Abnormal

Jika AMF menerima pesan yang berisi beberapa ID sesi PDU yang ditetapkan pada nilai yang sama (dalam sumber daya sesi PDU yang akan diswitched IE dalam daftar downlink),the AMF shall send a PATH SWITCH REQUEST FAILURE message to the NG-RAN node (dalam bahasa Inggris)Selain itu,

• As an exception, the AMF may generate a Path Switch Request Unsuccessful Transfer IE (Sebagai pengecualian, AMF mungkin menghasilkan Path Switch Request Unsuccessful Transfer IE).

• If a Partially Allowed NSSAI IE is received in a PATH SWITCH REQUEST ACKNOWLEDGE message, and the total number of S-NSSAI contained in the Allowed NSSAI and Partially Allowed NSSAI exceeds 8, maka data yang dikirimkan ke bagian ini akan dihapus.node NG-RAN akan menganggap prosedurnya telah gagal.

• Jika ada S-NSSAI yang hadir dalam NSSAI IE yang Diizinkan, node NG-RAN akan menganggap prosedur tersebut telah gagal.