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Dynamic Coverage Control for Authorized STAs in Home/Apt. Environment

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Presentation on theme: "Dynamic Coverage Control for Authorized STAs in Home/Apt. Environment"— Presentation transcript:

1 Dynamic Coverage Control for Authorized STAs in Home/Apt. Environment
March 2003 Dynamic Coverage Control for Authorized STAs in Home/Apt. Environment Tae-Jin Lee*, Kyunghun Jang** *SungKyunKwan University **Samsung Electronics March 2003 Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

2 What are Problems ? Densely populated WLANs APs in near-proximity
Mutual interference between them APs in near-proximity Rogue APs E.g., Home, Apartment Interfering each other Unauthorized access May hear other APs’ unnecessary transmission Unnecessary power consumption of APs APs transmit with fixed power all the time Tae-Jin Lee, SungKyunKwan University

3 Fixed TX Power & Coverage
Home1 Home2 n1 n4 AP n2 n5 AP n6 n3 Tae-Jin Lee, SungKyunKwan University

4 Adaptive TX Power & Coverage
Home1 Home2 n1 n4 AP n2 n5 AP n6 n3 Beacon range(Maximum) Data comm. range(Optimum) Tae-Jin Lee, SungKyunKwan University

5 Dynamic Coverage Control (DCC)
March 2003 Dynamic Coverage Control (DCC) To provide WLAN with effective “cell engineering” To tackle rogue APs and/or near-proximity APs To provide physical access to authorized STAs only To maintain optimal coverage area for authorized STAs To save unnecessary TX power of APs Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

6 March 2003 DCC Procedures An AP Requests authorized STAs to report their link margins using Measurement Request Frame Requested STAs report the AP with the link margins using Measurement Report Frame After collecting link margins from the authorized STAs, the AP adjusts TX power in order to optimally cover the authorized STAs The STAs may feedback to the AP whether the adjusted and received power is appropriate or not If it is not appropriate, the AP may increase the TX power When a new STA joins the BSS, or an existing STA leaves the BSS, the above procedure repeats Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

7 March 2003 DCC Procedures (cont.) The AP maintains timers to monitor which stations are not active during a certain period of time If a STA is not active, the AP re-adjusts the TX power with the STA excluded The AP may wait to request the link margins to newly added STAs until the “minimum measurement request time” interval is reached To minimize the frequent measurement request overhead Tae-Jin Lee, SungKyunKwan University Tae-Jin Lee, SungKyunKwan University

8 Maximum coverage range
DCC AP STA1 STA2 STA3 M.Request M.Request M.Request Maximum coverage range M.Report M.Report M.Report DCC Last Communication Adjusted coverage Comm. with Optimal TX Power(STA1,2 only) STA3 : Timeout DCC Adjusted coverage Beacon Target Beacon Transmission Time Comm. with Optimal TX Power New STA STA4 Coverage list update Adjusted coverage Authentication, Association with STA4 M.Request M.Report DCC Adjusted coverage Comm. With Optimal TX Power Tae-Jin Lee, SungKyunKwan University

9 Measurement Request/Report
IEEE AP IEEE STA 1 SME MLME MLME SME SNMP-Set.MREQUEST MLME-MREQUEST.req Measurement Request frame(TPC request) MLME-MREQUEST.ind M.Request MLME-MREQUEST.cfm MLME-MEASURE.req Measurement process MLME-MEASURE.cfm MLME-MREPORT.ind Measurement Report frame (TPC report) MLME-MREPORT.req M.Report MLME-MREPORT.cfm SNMP-Get.MREPORT IEEE r0-K-RRMControlFlow Tae-Jin Lee, SungKyunKwan University

10 Multiple Measurement Request
New STA1 AP STA1 Authentication, Association with STA1 M.Request(Delayed) STA2 New STA2 Authentication, Association with STA2 Min. M.Request Time M.Request(Delayed) STA3 New STA3 Authentication, Association with STA3 M.Request(Delayed) M.Request M.Request M.Request Multiple Measurement Request Tae-Jin Lee, SungKyunKwan University

11 Timeout and Coverage Update (1)
AP STA1 STA2 Adjusted coverage ㆍㆍㆍ Maximum range Beacon Timeout interval ㆍㆍㆍ ㆍㆍㆍ STA2's Timer=0 DCC Buffered data for STA2 ㆍㆍㆍ ㆍㆍㆍ AP adjusts automatically TX power using TIM or DTIM information PS-poll(when TIM) DCC awake Listen interval=2 dozing Tae-Jin Lee, SungKyunKwan University

12 Timeout and Coverage Update (2)
AP STA1 STA2 Adjusted coverage ㆍㆍㆍ Maximum range Beacon Timeout interval ㆍㆍㆍ ㆍㆍㆍ STA2's Timer=0 DCC ㆍㆍㆍ ㆍㆍㆍ Coverage list update Transmission event awake DCC Listen interval=2 dozing Tae-Jin Lee, SungKyunKwan University

13 Conclusions Dynamic Coverage Control (DCC)
TX power control of APs for optimal coverage of STAs in home/apt. environment Control of “rogue” accesses Provisioning of authorized accesses only Efficient resource utilization Power and Coverage area Various applications/scenarios Real-time streaming, Multicasting VoIP, Location-based services Tae-Jin Lee, SungKyunKwan University

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