Satellite Communications and Space Satellite Link Design Informational

What is the handover strategy between satellites in a LEO constellation for continuous service?

Q: How does handover affect latency?

During a well-executed make-before-break handover: the latency increase is minimal (< 50 ms). During a break-before-make handover: there is a brief outage (100-500 ms) that may cause TCP retransmissions and noticeable glitches in real-time applications. The network-level protocol stack must handle these transitions gracefully with buffering and multi-path redundancy.

Q: What happens at high latitudes?

At high latitudes (> 60°), inclined-orbit LEO satellites have more frequent overpasses and longer visibility windows, actually improving the handover situation. Polar regions may have coverage gaps with non-polar orbits (the Starlink constellation includes a polar shell for coverage at > 70° latitude).

LEO satellite handover ensures seamless, continuous connectivity as satellites pass overhead in 5-15 minute windows. Handover types: satellite handover (terminal switches from one satellite to the next), beam handover (terminal moves from one beam to another within the same satellite), and gateway handover (traffic is rerouted through a different ground gateway). Handover strategy: predictive scheduling (the network controller precomputes handover times based on satellite ephemeris), measurement-based triggering (the terminal monitors signal quality and triggers handover when it falls below a threshold), and hybrid (prediction + measurement). Make-before-break (the terminal connects to the new satellite before disconnecting from the old) provides seamless service. Handover latency: < 50 ms for well-designed systems (imperceptible to users). For Starlink: handovers occur every 3-5 minutes with < 20 ms interruption.

Category: Satellite Communications and Space

Updated: April 2026

Product Tie-In: LNBs, BUCs, Feeds, Antennas

LEO Handover

Inter-satellite links (ISLs) add another dimension to handover: traffic can be routed through the constellation mesh between satellites, so a handover at the user terminal does not necessarily require a handover at the gateway. This reduces the gateway handover frequency and enables global routing without ground relays. SpaceX's Starlink V2 satellites include laser ISLs operating at 100+ Gbps, enabling global mesh networking above the atmosphere.

Parameter	GEO	MEO	LEO
Altitude	35,786 km	2,000-35,786 km	200-2,000 km
Latency (one-way)	~270 ms	50-150 ms	1-20 ms
Coverage per Sat	Full hemisphere	Regional	Local footprint
Handover	None	Periodic	Frequent
Path Loss (Ku-band)	~206 dB	190-206 dB	170-190 dB

Performance verification: confirm specifications against the application requirements before finalizing the design
Environmental factors: temperature range, humidity, and vibration affect long-term reliability and parameter drift
Cost vs. performance: evaluate whether the application demands premium components or standard commercial grades

Common Questions

Frequently Asked Questions

How does handover affect latency?

During a well-executed make-before-break handover: the latency increase is minimal (< 50 ms). During a break-before-make handover: there is a brief outage (100-500 ms) that may cause TCP retransmissions and noticeable glitches in real-time applications. The network-level protocol stack must handle these transitions gracefully with buffering and multi-path redundancy.

What happens at high latitudes?

At high latitudes (> 60°), inclined-orbit LEO satellites have more frequent overpasses and longer visibility windows, actually improving the handover situation. Polar regions may have coverage gaps with non-polar orbits (the Starlink constellation includes a polar shell for coverage at > 70° latitude).

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