The present document studies and defines system enhancements for user plane congestion management based on the Stage-1 normative requirements defined in TS 22.101.
Based on the technical analysis, any needed enhancements/updates to 3GPP functions and interfaces are identified.
Normative specifications will be developed based on the conclusions of the present document.
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
RAN user plane congestion:
RAN user plane congestion occurs when the demand for RAN resources exceeds the available RAN capacity to deliver the user data for a period of time. RAN user plane congestion leads, for example, to packet drops or delays, and may or may not result in degraded end-user experience.
User-impacting congestion occurs when a service that is delivered to a user over the default bearer or a dedicated bearer does not meet the user's expected service experience due to RAN user plane congestion. The expectation for a service delivery is highly dependent on the particular service or application. The expected service experience may also differ between subscriber groups (e.g. a premium subscriber may have higher expectations than a subscriber with the cheapest subscription). RAN resource shortage where the RAN can still fulfil the user expectations for a service delivery is not considered to be user-impacting congestion; it is rather an indication for full RAN resource utilization, and as such a normal mode of operation.
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.