quality of service priority and preemption
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Quality of ServicePriority and Preemption
Brian KassaDirector of Technology Planning and Development
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What are Quality of Service,Priority and Preemption (QPP)?
• Quality of Service – Quality of Service is the overall performance of a telephony or data network, particularly as seen by the users of the network. To measure quality of service quantitatively, several related aspects of the network service are often considered, such as error rates, bandwidth, throughput, transmission delay, availability and jitter.
• Priority – Priority is a network capability that enables a user’s application or usage of the network to take precedence over another user’s application or usage of the network.
• Preemption – A network capability that permits authorized high priority traffic, e.g., coming from public safety or first responders, to take over resources assigned to lower priority traffic, e.g., private traffic.
Hi, I’m Sam!
Hi, I‘m Fred!
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Yeah I know That,But What Does This Mean?
• Quality of Service, Priority and Preemption are very broad terms for a very large set of 3GPP features and functionality that FirstNet and its partner will utilize to ensure that the first responders have priority access to Band 14 when they need it and if the situation requires it, prioritization among first responders.
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We Speak Different Languages
Does It Work When I Need It?
Public Safety
Operations
Cellular Engineers
Best EffortGuaranteed Bit Rate
Delay
Jitter
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We Speak Different Languages
Does It Work When I Need It?
Public Safety
Operations
Cellular Engineers
Best EffortGuaranteed Bit Rate
Delay
Jitter
Quality of Service = QCI and GBRPriority = ARP and …
Preemption = lower UE MBR
We Need A Rosetta
Stone
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The FirstNet Network
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Exit
Entrance
Imagine a 6 Lane Highway (Only one direction shown here)
Every ~5 Miles of Highway Supports:• 300-400 Active Users• 1000’s of Idle Users
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Quality of Service
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Entrance
Quality of Service = Setting Cruise Control at 70 Miles Per Hour and driving 70 Miles Per Hour 70
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Priority
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Exit
Entrance
Priority = This Lane is Yours, everyone else move over
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Preemption:Among First Responders
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Exit
Entrance
Preemption = Everyone Else must slow down and move over so that you can speed up 70
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Preemption:Between Primary Usersand Secondary Users Under a CLA
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Entrance
Secondary Users are removed instantaneously from the highway when Public Safety use demands it.
Preemption = Secondary Users Under a Covered Leasing Agreement must exit
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LTE is a “Cellular” Technology
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Sector A
Sector B
Sector C
One “Cell” SiteWith 3 Sectors
SectorA
SectorB
SectorC
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Cell-Sector Capacity
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Active Bearers (~1300+)Connected Users (~400+)
Idle – Registered Users (~1000+)
CELL EDGE
User Throughput
Throughput
High Low
Backhaul(~100 Mbps)
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An Ideal Coverage Map
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A Realistic Coverage Map
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Excellent Signal
Very Good Signal
Acceptable Signal
Poor Signal
No Signal
Good Signal
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Each Sector Can Be Independently Managed
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Sector ALoad = 70%
Sector BLoad = 50%
Sector CLoad = 10%
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QPP Control – Single Sector
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QPP Control –Two Adjoining Sectors
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QPP Control –Three Adjoining Sectors
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QPP Control –Multiple Cell Sites
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Uh Oh!I need More Water
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QPP Control –Multiple Incidents Independently
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QPP Control –Now What to Do?
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Uh Oh!I need More Water
Can I Help?
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Rosetta Stone –The QPP Framework
• The QPP Framework is a construct that– Allows engineers and first responders to talk
about QPP without diving too deeply into each other area of expertise
– Enables a way to describe network functionality
– Describes what the network needs to know in order to make decisions in the rare cases that the network become overloaded with first responder traffic
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The QPP Framework –At a High Level
• Every Cell Sector Across the Nation will be in one of three states– Static – The network will automatically apply QPP based on
what has been pre-configured when provisioned– Dynamic – The network will accept input from First
Responders to help mitigate congestion between First Responders.
– Controlled – The network must have input to reduce congestion between First Responders.
• The network can also handle a man down or responder emergency situation at the same time
• When needed, the network will take resources from secondary users to give to first responders
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