無線分封數據網路適應性資源分配策略與效能
This presentation is the property of its rightful owner.
Sponsored Links
1 / 41

無線分封數據網路適應性資源分配策略與效能 評估 PowerPoint PPT Presentation


  • 36 Views
  • Uploaded on
  • Presentation posted in: General

無線分封數據網路適應性資源分配策略與效能 評估. Speaker: Pei-Ni Tsai Adviser: Dr. Kai-Wei Ke 2011/7/27. Outline. Introduction 完全 共享資源分配 策略 (Complete share) 保衛 頻道資源分配 策略 (Guard channel) 外部 阻擋資源分配 策略 (External blocking) 數據結果與比較 結論. Introduction. 無線分封數據服務系統( General Packet Radio Service , GPRS ).

Download Presentation

無線分封數據網路適應性資源分配策略與效能 評估

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


6078705

無線分封數據網路適應性資源分配策略與效能評估

Speaker: Pei-Ni Tsai

Adviser: Dr. Kai-Wei Ke

2011/7/27


Outline

Outline

  • Introduction

  • 完全共享資源分配策略 (Complete share)

  • 保衛頻道資源分配策略 (Guard channel)

  • 外部阻擋資源分配策略 (External blocking)

  • 數據結果與比較

  • 結論


Introduction

Introduction

  • 無線分封數據服務系統(General Packet Radio Service,GPRS)

Fig. GPRS實體通道


52 multiframe

52-multiframe


52 multiframe1

52-multiframe


6078705

GPRS編碼方式


6078705

完全分割


6078705

RB的分配


Cs guard external blocking

CS、Guard、External blocking 的流程圖

j: Type 1 user的個數

k: Type 2 user的個數

b1: Type 1 user所需要的Time slot

b2: Type 2 user所需要的Time slot

R: 最少需要的Radio blocks


Complete share

Complete share


Complete share1

Complete share

  • 系統內有二種Type的使用者

  • Packet call is Poisson arrival

  • 假設每個packet call只傳送1個packet,packet length是exponential distribution,平均值分別為L1, L2

  • Service time isexponential distribution

B:每個RB在52-multiframe的時間中能夠傳送的位元數


Complete share2

Complete share

  • GPRS_TS: GPRS所使用的Time slot數目

  • Capacity C = GPRS_TS × 12(Radio blocks)

  • i : 所使用的Time slot數目

  • j: Type 1 user的個數

  • k: Type 2 user的個數

  • b1: Type 1 user所需要的Time slot

  • b2: Type 2 user所需要的Time slot

  • 最少需要的Radio blocks R = j × b1 + k × b2


Complete share3

Completeshare

  • GPRS_TS = 3

  • b1=1

  • b2=2


Time slot

Time slot 分配流程圖

  • GPRS_TS = 3

  • b1=1

  • b2=2


Complete share4

Complete share

E1: Average Radio Blocks of Type 1

E2: Average Radio Blocks of Type 2


Complete share5

Complete share

λ1 = λ1n + λ1h

λ2 = λ2n + λ2h


Complete share6

Complete share

Pb1n: blocking probability of type 1 new call

Pb1h: dropping probability of type 1 handover

Pb2n: blocking probability of type 2 new call

Pb2h: dropping probability of type 2 handover

U: Utilization


Guard channel

Guard channel

g:每個TS保留給 handover 的Radio blocks數目


Guard channel1

Guard channel

  • GPRS_TS: GPRS所使用的Time slot數目

  • Capacity C = GPRS_TS × 12(Radio blocks)

  • i : 所使用的Time slot數目

  • j: Type 1 user的個數

  • k: Type 2 user的個數

  • b1: Type 1 user所需要的Time slot

  • b2: Type 2 user所需要的Time slot

  • 最少需要的Radio blocks R = j × b1 + k × b2


Guard channel2

Guard channel

  • GPRS_TS = 3

  • b1=1

  • b2=2

  • g=1


Guard channel3

Guard channel

G = g × GPRS_TS


Guard channel4

Guard channel


External blocking

External blocking

Peb: external blocking probability


External blocking1

External blocking

  • GPRS_TS: GPRS所使用的Time slot數目

  • Capacity C = GPRS_TS × 12(Radio blocks)

  • i : 所使用的Time slot數目

  • j: Type 1 user的個數

  • k: Type 2 user的個數

  • b1: Type 1 user所需要的Time slot

  • b2: Type 2 user所需要的Time slot

  • 最少需要的Radio blocks R = j × b1 + k × b2


External blocking2

External blocking

  • GPRS_TS = 3

  • b1=1

  • b2=2

  • g=1


External blocking3

External blocking

G = g × GPRS_TS


External blocking4

External blocking


External blocking5

External blocking


6078705

數據結果與比較

  • OMNeT4.1

  • GPRS_TS = 3

  • b1 = 1

  • b2 = 2

  • g = 1

  • 使用CS-2

    • B = 240 bits

  • λ1:λ2 = 1:1,λh:λn= 3 : 7,L1:L2 = 1:1

  • Normalized traffic load


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn= 3 : 7,L1:L2 = 1:1 時使用者平均分配的RB 數


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn= 3 : 7,L1:L2 = 1:1 時使用者平均分配的RB數


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn = 3 : 7,L1:L2 = 1:1 的 type 1 使用者阻擋/斷線機率


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn = 3 : 7,L1:L2 = 1:1 的 type 2 使用者阻擋/斷線機率


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn = 3 : 7,L1:L2 = 1:1 的 type 1 使用者阻擋/斷線機率


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn = 3 : 7,L1:L2 = 1:1 的 type 2 使用者阻擋/斷線機率


6078705

數據結果與比較

λ1:λ2 = 1:1,λh:λn= 3 : 7,L1:L2 = 1:1 的資源使用率


6078705

結論

  • 保衛頻道機制和外部阻擋機制保護了handover call,所以handover call 的斷線機率降低,然而這同時會造成new call 的阻擋機率升高

  • 外部阻擋機制的保護是介於完全共享和保衛頻道機制之間,當Peb越大,阻擋/斷線機率的值越靠近保衛頻道機制;而當Peb越小,阻擋/斷線機率的值越靠近完全共享機制

  • 可依不同的需求採取不同的策略,設定不同的參數

  • 三種機制的系統資源使用率差異不大


6078705

未來展望

  • 使用不同的策略分配GSM和GPRS

  • 以考慮數個分封呼叫


References

References

  • Wei-Yeh Chen, Jean-Lien C. Wu, and Hung-Huan Liu, “Performance Analysis of Radio Resource Allocation in GSM/GPRS Networks,” IEEE VTC 2002-Fall, vol. 3, pp. 1461-1465, 2002.

  • C. Lindemann, and A. Thummler, “Performance analysis of the general packet radio service,” Computer Networks, Vol. 41, Issue 1, 2003, pp. 1–17.

  • Bin Li, et al., “Call Admission Control for Voice/Data Integrated Cellular Networks: Performance Analysis and Comparative Study,” IEEE Journal on Selected Areas in Communications, vol. 22, Issue 4, pp. 706-718, May 2004.

  • P. Lin and Y.-B. Lin, “Channel allocation for gprs,” IEEE Transactions on Vehicular Technology, vol. 50, no. 2, pp. 375–387, 2001.

  • K. Mitchell and K. Sohraby, “An analysis of the effects of mobility on bandwidth allocation strategies in multi-class cellular wireless networks,” in Proceeding of IEEE INFOCOM, vol. 2, 2001, pp. 1005–1011


References1

References

  • 蔡鎮年著,無線分封數據服務網路之高使用率資源分配策略與效能評估,碩士論文,國立臺北科技大學資訊工程系碩士班,臺北,2004

  • Kai-Wei Ke, Chen-Nien Tsai, and Ho-Ting Wu, “Performance analysis for hierarchical resource allocation in multiplexed mobile packet data networks,” Computer Networks, Vol. 54, Issue 10, 2010, pp. 1707-1725.

  • “Understanding General Packet Radio Service (GPRS): Application Note 1377,” Agilent Technologies.

  • EmmanuslSeurre, PartickSaveli, and Pierre-Jean Pietri, GPRS for Mobile Internet, Artech House, Jan. 2003.


6078705

Q&A


  • Login