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Extended Dynamic Allocation (SExtended Dynamic Allocation (S1212) ) -- ReportReport

March 22nd, 2011

• Network indicates UL transmission turns by attaching USF flags into DL frames

• Each MS sharing a TSL has been assigned a USF at UL TBF creation

• An MS listens to the DL slots of its TBF to detect USFs

• A USF flag allocates a transmission turn on the UL slot which has the same slot number as the DL slot in which the flag was received

Introduction: (Normal) Dynamic Allocation (1/2)

• An MS needs to detect USFs separately for each slot allocated for a UL TBF

DL

UL

USF

0 1 2 3 4 5 6 7

X

USF

X

0 1 2 3 4 5 6 7

• Dynamic allocation does not allow usage of more than two UL slots

because an MS would not have time for Rx -> Tx switch

Introduction: (Normal) Dynamic Allocation (2/2)

0 1 2 3 4 5 6 7DL

UL

USF

0 1 2 3 4 5 6 7

X X

USF USF

X

0 1 2 3 4 5 6 7

Extended Dynamic Allocation

• Extended Dynamic Allocation (EDA) is an extension to the Dynamic Allocation (DA) medium access method.

• It enables a mobile to use more uplink (UL) timeslots, and reach higher UL throughput by removing the need for the mobile to detect uplink state flags (USFs) separately for each allocated UL timeslot.

• A received USF gives the mobile permission to send data during the next block period on the corresponding UL timeslot and on all other following timeslots belonging to the UL TBF allocation.

EDA concept

• The example below presents an UL TBF consisting of 4 timeslots (1, 2, 3, 4). The mobile receives a USF in timeslot 1 and can therefore transmit on slots 1, 2, 3 and 4 during the next block period

• EDA allows a mobile to use more than two timeslots in UL. In BSS12, the maximum number of UL timeslots per UL TBF is four, which permits the following maximum UL bitrates:

• GPRS with CS-1/CS-2, up to 48 kbit/s

• GPRS with CS-3/CS-4, up to 80 kbit/s

• EDGE, up to 236 kbit/s

MS Multislot Classes

MS Multislot

Class

Maximum Number of TSL

Downlink+Uplink Configurations

Rx Tx Sum

1 1 1 2 1+1

2 2 1 3 2+1

3 2 2 3 2+1, 1+2

4 3 1 4 3+1

5 2 2 4 2+2

6 3 2 4 3+1, 2+2

MS Multi slot

Class

Maximum Number of TSL

Downlink+Uplink Configurations

Rx Tx Sum

30 5 1 6 5+1

31 5 2 6 5+1, 4+2

32 5 3 6 5+1, 4+2, 3+3

33 5 4 6 5+1, 4+2, 3+3, 2+4

34 5 5 6 5+1, 4+2, 3+3, 2+4

35 5 1 5 4+1

36 5 2 5 4+1, 3+27 3 3 4 3+1, 2+2, 1+3

8 4 1 5 4+1

9 3 2 5 3+2

10 4 2 5 4+1, 3+2

11 4 3 5 4+2, 3+2, 2+3

12 4 4 5 4+1, 3+2, 2+3, 1+4

36 5 2 5 4+1, 3+2

37 5 3 5 4+1, 3+2, 2+3

38 5 4 5 4+1, 3+2, 2+3

39 5 5 5 4+1, 3+2, 2+3

40 6 1 6 5+1

41 6 2 6 5+1, 4+2

42 6 3 6 5+1, 4+2, 3+3

43 6 4 6 5+1, 4+2, 3+3, 2+4

44 6 5 6 5+1, 4+2, 3+3, 2+4

45 6 6 6 5+1, 4+2, 3+3, 2+4

With Extended Dynamic Allocation (EDA)With High Multislot Classes (HMC)With EDA + HMC Application software

BSC level BSC level -- DailyDaily

Daily average number of requested TSLs for UL TBF allocations has increased after EDA activation. The allocation ratio has decreased which emphasize the PS territory size limitation.

Segment level Segment level –– DailyDailyDXBDXB07621 07621 major contributormajor contributor

DXB07621 is one the most contributor segments with regards to UL TSLs allocation increase mainly due to adequate PS territory size (allocation ratio remains stable despite the requests increase)

BSC level BSC level -- DailyDaily

Requests of 3 and 4 timeslots for UL TBFs has increased at the cost of #2 TSLs requests. The trend is MS class dependant. 1 TSL requests still have the biggest share (around 95%).

BSC level BSC level -- DailyDaily

EDA related allocation ratio is very low compared to the requests trend presented in the previous slide.

BSC level BSC level -- DailyDaily

EDA allocations per number of TSLs distribution

BSC BSC level level –– DailyDaily

EGPRS payload has slightly increased. Maybe not linked to EDA activation

Segment level Segment level –– HourlyHourlyDXBDXB07621 07621 major contributormajor contributor

Drilling down to DXB07621. The PS territory size limitation is obvious from the GPRS throughput trend. EDGE throughput is stable.

BSC level BSC level -- DailyDaily

On the BSC level, PS territory upgrade has slightly increased.

BSC level BSC level -- DailyDaily

On the BSC level, EDA to DA reallocations “downgrades” are more happening

BSC level BSC level -- DailyDaily

EDA capable MS share in the network seems to be high. PS territory size strategy in the main limitation factor.

ConclusionConclusion

• Due to PS territory size current configuration, the impact of EDA activation was not obvious from the end user experience point of view.

• The EDA related statistics highlight as well that majority of EGPRS users might get EDA benefits.

• The EGPRS quality of service will significantly improve once EDA and HMC (High Multislots Classes) features are combined with a proper PS territory size strategy