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Verizon's DSS performance 'disappointing,' says SRG | FierceWireless - FierceWireless

Verizon's DSS performance 'disappointing,' says SRG | FierceWireless - FierceWireless

Verizon's DSS performance 'disappointing,' says SRG | FierceWireless - FierceWireless
Dec 04, 2020 1 min, 40 secs

Mike Thelander, CEO and founder of SRG, said he agrees with Ray when it comes to performance issues related to dynamic spectrum sharing.

SRG tested DSS on Verizon’s network in two markets: Minneapolis where Ericsson is the vendor and Oklahoma City where Nokia is the vendor.

In Verizon’s markets where Ericsson is the vendor, it’s using something called Cell Reference Signal (CRS) rate matching.

In its Nokia markets, it’s using Multicast Broadcast Single Frequency Network (MBSFN).

According to Thelander, CRS is what operators want because it’s the most dynamic in terms of how they can allocate capacity between LTE and 5G as the traffic shifts.

“If you’re going to allocate spectrum or capacity between 4G and 5G, you want it to be as dynamic as the traffic in your network.

Earlier this year, T-Mobile’s Ray said one of the major network equipment vendors was “very late” when it came to DSS, and while he never identified the vendor by name, many inferred it was Nokia.

In fact, he said Nokia has solutions available for both MBSFN and CRS rate matching, and Verizon can use CRS rate matching in Nokia markets anytime it decides to go in that direction.

“They both have their pros and cons,” Tavares said of MBSFN and CRS rate matching.

The problem with MBSFN is it’s not as dynamic.

In summary, “5G NR DSS with CRS rate matching will likely become the long-term DSS solution of choice for most operators, or at least this statement is true for AT&T and Verizon,” SRG said in its report.

5G NR DSS with MBSFN shouldn’t have interference-related issues, but there are inherent inefficiencies associated with using a semi-static solution to handle the dynamic mix of 5G NR and LTE traffic

“My sense is that T-Mobile doesn’t necessarily have as good an LTE network in a lot of markets as the other two operators, so they need 5G to be successful,” Thelander said

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