A.1 Deriving Allocation Information for a Radio Link

25.4233GPPRelease 17TSUTRAN Iur interface Radio Network Subsystem Application Part (RNSAP) signalling

A.1.1 Establishment of a New Radio Link

The Allocation Information for a Radio Link in the case of establishment of a new Radio Link shall be derived as follows:

– The latest received Allocation/Retention Priority IE for each transport channel shall be used.

Note: The Allocation/Retention Priority IE for a transport channel may have been received in
a) the procedure that establishes the first Radio Link for the UE in the DRNS or
b) a procedure adding or modifying the transport channel.

– If the Priority Level IE in the Allocation/Retention Priority IE for all transport channels that are intended to use the Radio Link is set to “no priority”, the pre-emption capability of the Radio Link shall be set to “shall not trigger pre-emption”.

– If the Priority Level IE in the Allocation/Retention Priority IE for one or more of the transport channels that are intended to use the Radio Link is not set to “no priority”, the allocation priority and the pre-emption capability of the Radio Link shall be set according to the following:

– The transport channels that have the Priority Level IE in the Allocation/Retention Priority IE set to “no priority” shall be excluded when setting the allocation priority and pre-emption capability of a Radio Link.

– The allocation priority for a Radio Link shall be set to highest priority level, given by the Priority Level IE in the Allocation/Retention Priority IE, for all non excluded transport channels that are intended to use the Radio Link.

– If all non-excluded transport channels that are intended to use a Radio Link to be established have the pre-emption capability, given by the Pre-emption Capability IE in the Allocation/Retention Priority IE, set to “shall not trigger pre-emption”, the pre-emption capability of the Radio Link shall be set to “shall not trigger pre-emption”.
If one or more non-excluded transport channels that are intended to use the Radio Link to be established have the value of the Pre-emption Capability IE in the Allocation/Retention Priority IE set to “may trigger pre-emption”, the pre-emption capability of the Radio Link shall be set to “may trigger pre-emption”.

The derived allocation priority and pre-emption capability are only valid during this allocation/retention process.

A.1.2 Modification of an Existing Radio Link

The Allocation Information for a Radio Link in the case of modification of a Radio Link (addition or modification of transport channels using the Radio Link) shall be derived as follows:

– The latest received Allocation/Retention Priority IE for each transport channel shall be used.

Note: The Allocation/Retention Priority IE for a transport channel may have been received in
a) the procedure that establishes the first Radio Link for the UE in the DRNS,
b) a previous procedure adding or modifying the transport channel, or
c) the current procedure adding or modifying the transport channel.

– If the Priority Level IE in the Allocation/Retention Priority IE for all transport channels to be added or modified in the Radio Link is set to “no priority”, the pre-emption capability of the Radio Link to be modified shall be set to “shall not trigger pre-emption”.

– If the Priority Level IE in the Allocation/Retention Priority IE for one or more of the transport channels to be added or modified in the Radio Link is not set to “no priority”, the allocation priority of and the pre-emption capability of the Radio Link to be modified shall be set according to the following:

– The transport channels to be added or modified that have the Priority Level IE in the Allocation/Retention Priority IE set to “no priority” shall be excluded when setting the allocation priority and pre-emption capability of a Radio Link to be modified.

– The allocation priority for a Radio Link to be modified shall be set to highest priority level, given by the Priority Level IE in the Allocation/Retention Priority IE, for all the non-excluded transport channels that are to be added or modified.

– If all non-excluded transport channels that are to be added or modified in the Radio Link have the pre-emption capability, given by the Pre-emption Capability IE in the Allocation/Retention Priority IE, set to “shall not trigger pre-emption”, the pre-emption capability of the Radio Link to be modified shall be set to “shall not trigger pre-emption”.
If one or more of the non-excluded transport channels to be added or modified in the Radio Link have the value of the Pre-emption Capability IE in the Allocation/Retention Priority IE set to “may trigger pre-emption”, the pre-emption capability of the Radio Link to be modified shall be set to “may trigger pre-emption”.

The derived allocation priority and pre-emption capability are only valid during this allocation/retention process.