Professional Home for Life ®20th IET Annual Technical Conference

Dr. Asoka Korale C.Eng. MIET

A Scheme for Event Triggered Cellular Yield Enhancement in

Third Generation Mobile Networks

Professional Home for Life ®20th IET Annual Technical Conference

Intense competition between mobile operators Tariff wars between competing operators Drives down call rates, approaching levels on the subcontinent Regulator steps in and establishes floor rates

Idle network resources, like hotel rooms wasted if not consumed Uneven utilization of radio and core network Dependent on time of day, geographic location

Maximize return on investment on very high capital intensive investments

Technology cycle is rapid Ever more advanced handsets and sophisticated services demand

that the radio and core network technology is evolving with current trends

The Case for Cellular Yield Maximization

Professional Home for Life ®20th IET Annual Technical Conference

The degree to which the network is overbuilt to handle busy hour traffic

Trade off between Coverage and Capacity

Different tariffs aimed at evening out the utilization levels Time based tariffs (lower rates the evening) Aimed at shifting the busy hour to another time

Dynamic Discount Systems Offer discounted services depending on time

Considerations in Maximizing Cellular Utilization

Professional Home for Life ®20th IET Annual Technical Conference

Admission Control Determines which users/services are admitted depending on resource availability

Transport Channel Switching Data rate modified depending on traffic volume and quality measurements

Radio Access Bearer Downsizing Lower rate than requested may be offered for interactive / background services

Preemption Based on QOS profile, allocation / retention priority may preempt low priority links

Power Reservation Reserving a portion of cell power for HSDPA users

Maximum Power Per Code Limits maximum power transmitted to a user for a more equitable distribution of power

overall

UMTS Techniques for Efficient Radio Resource Management

Professional Home for Life ®20th IET Annual Technical Conference

Measurement Capture Convert measurements to cellular load on uplink / Down link

Cell selection Algorithm for determining suitable cells for CYM

Measurement Processing Determining offer based on Load, Time and Location

Communicating offer Via cell broadcast center

Record transaction for charging and billing Store time and cell information together with offer

Components of an Event Based CYM System

Professional Home for Life ®20th IET Annual Technical Conference

Noise Rise RTWP/Noise Floor

(received total wide band power /108 dBm)

Average Channel Element Utilisation

Cellular Load on Uplink

Professional Home for Life ®20th IET Annual Technical Conference

Level of code tree usage Average channel element utilization Iub resource availability

Cellular Load on Down Link

PNonHS

PHSDPA

PMAX

Figure 1: Shared Single Carrier

PTX

MAX

TX

PP

TXMAXNonHS

NonHS

PPPP

MAX

NonHSTX

PPP

Professional Home for Life ®20th IET Annual Technical Conference

Framework for Cell SelectionPeriodic Cell Measurements

Is UL Noise Rise (or RTWP) < Noise Rise Activation threshold

Is UL CE Utilization < UL CE Utilization Activation threshold

Is Code Utilization < Code Utilization Activation threshold

Is DL Power KPI < DL Power Activation threshold

Is DL CE Utilization < DL CE Utilization Activation threshold

Is Iub Utilization < Iub Utilization Activation threshold

Candidate Cell for CYM

Y

N

N

N

N

N

N

Y

Y

Y

Y

Y

Professional Home for Life ®20th IET Annual Technical Conference

The operator/information provider will determine the duration and frequency of the cyclical broadcast of the CBS messages

A CBS page consists of 82 octets that correspond to 93 characters when using the default character set. Up to 15 such pages can be concatenated to form a single CBS message. Each page will have a message identifier and a serial number. For a single message the message identifier and serial number will be the same across the pages allowing the user equipment (UE) to ignore re-broadcasts of already received messages.

Communicating the Offer via Cell Broadcast

Uu

CellBroadcast

Center

(CBC)

UTRAN

RNCNode B

Node BUE

UE

1Iub

IuBC

Professional Home for Life ®20th IET Annual Technical Conference

An event based CYM system can be developed inhouse The event based CYM allows a vast array of strategies for the

enhancement of utilization levels in cells of interest Opens up new avenues for revenue generation. The cells can be selected based on their utilization levels or

on their specific geographic location or based on both considerations.

The time factor may also be taken in to account where cells in certain zones may or may not be impacted by the event based CYM depending on the specific time of day

Conclusion

Professional Home for Life ®20th IET Annual Technical Conference

Thank you