1. A Downlink Data Region Allocation Algorithm for IEEE 802.16e OFDMA
A. Bacioccola, C. Cicconetti, L. Lenzini
, E. Mingozzi
Information, Communications & Signal Processing, th International Conference

2. Outline Introduction Sample data region allocation algorithm (SDRA)
Performance analysis
Conclusion

3. Introduction IEEE 802.16e extends IEEE 802.16-2004
Support the mobility of users
Provide QoS guarantees
OFDMA is the target air interface for mobile BWA with IEEE e
mobile users with an improved resilience
multi-path fading in non-line-of-sight environments
wireless multiple access methods

4. Introduction An IEEE 802.16e cell consists of
Mobile Stations (MSs)
Base Station (BS)
Access to the medium is scheduled on a time frame basis.
MAC frames extend over two dimensions
Time
Frequency
而ms是以time frame basis，去存取網路資源
而且mac frames可以被視為是一個二維陣列
這裡以minimum data transmission unit為一OFDMA的slot
Minimum data transmission unit
time
frequency …

5. Introduction
Data packets are conveyed into bi-dimensional data regions
rectangles of slots within the frame
DL-MAP
UL-MAP
The only constraint
all data regions without overlapping
所以data的傳送是在這二維陣列
而bs透過dlmap、ulmap來控制data region

6. Introduction BS transmits eight slots of data to MS 2*4 3*3 4*2
1*8
2*4
One slot remains empty

7. SDRA …

8. Performance analysis

9. Performance analysis …

10. Performance analysis

11. Conclusion
In this paper, they have addressed the data region allocation problem in IEEE e with the OFDMA air interface
Proposed a solution for data region allocation
SDRA

12. Thank you