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White Paper

Radio Resource Management – Connection Mobility Control eNodeB Source Handover Strategies


In this white paper, we primarily focus on the connected mode ofUser Equipment (UE) at the Source E-UTRAN Node B (eNodeB). We discuss a strategy for Connection Mobility Control (CMC), including the determination of handover and the criteria for target cell determination for handover.

Radio Resource Management (RRM) is an eNodeB application function that ensures the efficient use of available radio resources. RRM manages the assignment, re-assignment and release of radio resources with consideration of single and multi-cell aspects.

eNodeB is the hardware that is connected to a mobile phone network that communicates directly with mobile handsets (user equipment), like a base transceiver station (BTS) in GSM networks. 

The primary goal of RRM is to control the use of radio resources in the system. This must be accomplished while the Quality of Service (QoS ) requirements of the individual radio bearers are met and the overall used radio resources on the system level are minimized.

Long Term Evolution (LTE) RRM includes a variety of algorithms that provide services such as, power control, allocation of resources, mobility control and QoS management to ensure the best use of the available radio resources. The key aspects of the eNodeB architecture include the following:

  • Radio Admission Control (RAC)
  • Radio Bearer Control (RBC)
  • Connection Mobility Control (CMC)
  • Dynamic Allocation of resources to UE’s in both uplink and downlink(DRA)
  • Inter-Cell Interference co-ordination (ICIC)
  • Load Balancing (LB)

 The key inputs for the Connected Mode (CMC) include the following:

  • UE Power Measurement Configuration
  • UE Power and Quality Measurement Report
  • eNodeB Physical Layer Measurement
  • Neighbor and Network Loads

 We discuss three phases in the Handover preparation:

  • Handover Requirement Determination
  • Handover Preparation
  • Handover Target Determination 

The CMC strategy for the Handover requirement Determination phase is part of the CMC function and will trigger a handover if required on the basis of UE’s RSRIP / RSRQ, configured for the serving cell.

In Phase II, the CMC function maps the path to be followed out of several LTE network connection paths.

In Phase III, strategy is part of the CMC function that selects the target cell.