Dynamic Multi-SIM Gap Creating Procedure
Jakob L. Buthler, Troels B. Sørensen · 2016
User Equipments (UEs) supporting insertion of Multiple Subscriber identity Modules (Multi-SIM) have been becoming increasingly popular within the last half decade. End-user requires low cost, which is achieved by implementing a minimum of extra hardware resources compared to a single Subscriber Identity Module (SIM) UE. This sparse amount of extra hardware give rise to access conflicts between the multiple connections and the available hardware, ending up in lost data on at least one of the connections. This paper suggests framework with a dynamic weighting system used to resolve such conflicts, using data characteristics. The goal of the weighting is to handle conflicts optimally; i.e. each connections procedure has minimal impact on the others. We present the framework, as well as the dynamic weighting routine. Throughout the paper we present performance results, showing that the proposed method significantly reduces the latency experienced by the active data connection, when under the influence of Multi-SIM conflicts. The results are obtained using a Long Term Evolution (LTE) downlink simulator combined with a Global System for Mobile (GSM) control channel simulator. Furthermore, we also analyse the impact on the conflicting idle mode SIM.