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TR 25.903RAN6
Continuous Connectivity
for Packet Data Users

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V15.0.0 (PDF)  2018/06  143 p.
V14.0.0  2017/03  145 p.
V13.0.0  2016/01  141 p.
V12.0.0  2014/09  139 p.
V11.0.0  2012/09  139 p.
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V8.0.0  2008/12  141 p.
V7.0.0  2007/03  140 p.

Rapporteur:  Mr. Baker, Matthew

Packet-oriented features like HSDPA and E-DCH in WCDMA/UMTS systems will promote the subscribers" desire for continuous connectivity, where the user stays connected over a long time span with only occasional active periods of data transmission, and avoiding frequent connection termination and re-establishment with its inherent overhead and delay.
This is the perceived mode a subscriber is used to in fixed broadband networks (e.g. DSL) and a precondition to attract users from fixed broadband networks.
To support a high number of HSDPA users in the code limited downlink the feature F-DPCH was introduced in REL-6.
In the uplink, the limiting factor for supporting a similarly high number of E-DCH users is the noise rise.
For such a high number of users in the cell it can be assumed that many users are not transmitting any user data for some time (e.g. for reading during web browsing or in between packets for periodic packet transmission such as VoIP).The corresponding overhead in the noise rise caused by maintained control channels will significantly limit the number of users that can be efficiently supported.
As completely releasing dedicated channels during periods of traffic inactivity would cause considerable delays for reestablishing data transmission and a corresponding bad user perception, this WI is intended to reduce the impact of control channels on uplink noise rise while maintaining the connections and allowing a much faster reactivation for temporarily inactive users.
This TR summarizes the work done under the WI "Continuous Connectivity for Packet Data Users" by listing technical concepts addressing the objectives of the work item (see below), analysing these technical concepts and selecting the best solution (which might be a combination of technical concepts).