7 Exceptions for BSSMAP message contents and information element coding when transferred on the E‑interface

3GPP49.008Application of the Base Station System Application Part (BSSAP) on the E interfaceRelease 17TS

7.1 Message contents

For the applicable BSSMAP messages transferred on the E‑interface the following exceptions to the descriptions in 3GPP TS 48.008 [4] subclause 3.2.1 are valid:

Assignment request message:

– excluded information elements:

– circuit identity code;

– AoIP Transport Layer Address (MGW);

– Call Identifier;

– Codec List (MSC Preferred).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Assignment complete message:

– excluded information element:

– circuit pool;

‑ circuit identity code;

– AoIP Transport Layer Address (BSS);

– Speech Codec (Chosen);

– Codec List (BSS Supported).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Assignment failure message:

– excluded information elements:

– circuit pool;

– circuit pool list;

– Codec List (BSS Supported).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Handover request message:

– excluded information element:

– circuit identity code;

– AoIP Transport Layer Address (MGW);

– Call Identifier;

– Codec List (MSC Preferred).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Handover request acknowledge message:

– excluded information element:

‑ circuit pool;

‑ circuit identity code;

– AoIP Transport Layer Address (BSS);

– Speech Codec (Chosen);

– Codec List (BSS Supported).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Handover failure message:

– excluded information elements:

– circuit pool;

– circuit pool list;

– Codec List (BSS Supported).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

Handover performed message:

– excluded information elements:

– Speech Codec (Chosen);

– Codec List (BSS Supported).

– if received, the information element shall be treated as an information element with an unrecognisable identifier.

7.2 Information element coding

For the applicable BSSMAP information elements transferred on the E‑interface the following exceptions to the description in 3GPP TS 48.008 [4] subclause 3.2.2.5 are valid:

Cause information element:

– excluded causes:

– call control;

– CCCH overload;

– handover successful;

– requested terrestrial resource unavailable;

– terrestrial circuit already allocated;

– circuit pool mismatch;

– switch circuit pool;

– Call Identifier already allocated.

The corresponding cause values shall be considered as reserved for national use.

Cell identifier information element:

– excluded format:

– Cell Identity.

The corresponding cell identification discriminator value shall be considered as reserved.