Voice Roaming Issues
Question
ABC Company end users are reporting voice roaming issues.
Which two situations are possible causes? (Choose two.)
Answers
Explanations
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A. B. C. D. E.AC.
Voice roaming issues occur when a mobile device moves from one access point (AP) to another while on a voice call, and the call quality is affected due to a break in the connection between the mobile device and the wireless network. To address this problem, seamless roaming should be enabled, which allows the mobile device to move from one AP to another without losing connectivity.
The two possible causes of voice roaming issues in ABC Company are:
A. The RF coverage cells have only 10-percent overlap; 15- to 20-percent cell overlap is typically needed for seamless roaming.
RF coverage cells are the areas covered by wireless signals from an AP. If there is not enough overlap between RF coverage cells, the mobile device may lose connectivity when moving from one cell to another, resulting in poor voice quality or dropped calls. Seamless roaming requires an overlap of at least 15-20 percent between RF coverage cells. In this case, the RF coverage cells have only a 10-percent overlap, which is not sufficient for seamless roaming.
D. The RF coverage cells have only 20-percent overlap; 25- to 30-percent cell overlap is typically needed for seamless roaming.
Similar to scenario A, this scenario also indicates that the RF coverage cells do not have enough overlap, which may cause voice roaming issues. The overlap of RF coverage cells in this scenario is slightly better than scenario A but is still not sufficient for seamless roaming.
B, C, and E are not the possible causes of voice roaming issues in this scenario.
B. The RF coverage is colocated.
Colocated RF coverage refers to multiple APs that share the same channel and operate in the same area. This situation can cause interference, but it does not directly affect seamless roaming or voice roaming issues.
C. There is interference from a 5 GHz DECT-like phone.
Interference from a 5 GHz DECT-like phone may cause voice quality issues, but it is not related to seamless roaming or voice roaming issues.
E. There is interference from the cellular network.
Interference from the cellular network may also cause voice quality issues, but it is not related to seamless roaming or voice roaming issues.
In summary, the lack of sufficient overlap between RF coverage cells is the likely cause of the voice roaming issues reported by ABC Company's end users.
