Identifying Frequency Priority Parameters in LTE

4G LTE
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Friends, I need to determine the priority among frequency relationships for both idle and connected modes in LTE Huawei.

For idle mode, I use the CELLRESELPRIORITY parameter from MO → EUTRANINTERNFREQ.

However, for connected mode, which parameter should I check? Is it the same as for idle mode, or is there a different parameter? Do I use CELLRESELPRIORITY in both cases?

Identifying Frequency Priority Parameters in LTE
Identifying Frequency Priority Parameters in LTE1024×1024 156 KB

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There is a separate parameter for connected mode within the same MO, EUTRANINTERNFREQ.

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The network is configured to 0.

In this case, does it perform Inter-Frequency Handover to any carrier with better radio levels, or does it follow CELLRESELPRIORITY?

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If all EARFCNs are set to 0, the selection will be random since all have the lowest and equal priority.

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For connected mode: CellReselPriority in MO → EUTRANINTERNFREQ

For idle mode: CellReselPriority in MO → CELLRESEL

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However, as mentioned, CELLRESEL only allows assigning priority to the source cell; it does not enable prioritization of neighboring carriers.

This is why I believe the CONNFREQPRIORITY parameter from MO → EUTRANINTERNFREQ is the correct one.

Since it is set to zero, I assume that in connected mode, the handover will be directed to the cell with the best radio conditions.

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CellResel defines the priority of the source frequency, which is then compared with the priority values of neighboring frequencies (EUTRANINTERNFREQ).

And yes, this applies to idle mode.

For handover, multiple parameters are considered, including the frequency-based handover parameter you mentioned. However, this type of handover is not commonly used as it can significantly unbalance traffic. In connected mode, it is generally preferable to rely on coverage-based handover and MLB (Mobility Load Balancing).

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Got it! Since priorities are not defined in CONNFREQPRIORITY, and if MLB is enabled, the system takes traffic load into account when selecting a carrier.

If a carrier is heavily loaded, the system will prefer to move the UE to another carrier with a lower load, as long as the signal quality remains acceptable.

Thanks, everyone, for your time and responses! :+1:t3::+1:t3:

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Yes, it will function as a frequency-priority-based handover.

If set to 0, it will follow a normal coverage-based handover.

Even MLB-based priority can be assigned within the same MO.

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If two carriers have the same inter-frequency priority, the reselection and handover behavior varies between Idle Mode and Connected Mode:

Idle Mode: Reselection Criteria

  1. The Serving Cell RSRP must drop below Snonintrasearch.
  2. The Target Cell RSRP must exceed the Serving Cell RSRP by more than Qhyst (typically 2 dB or 4 dB).

Connected Mode: Handover Criteria

Inter-frequency priority is not considered for handover. Instead, a handover occurs when both of the following conditions are met:

  1. The Serving Cell RSRP falls below the A2 threshold.
  2. The Target Cell RSRP exceeds the A5 threshold.

This distinction ensures efficient mobility management, optimizing both idle and connected mode transitions.

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