Enabling Flexibility of Traffic Split Function in LTE-WiFi Aggregation Networks through SDN
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1 Enabling Flexibility of Traffic Split Function in LTE-WiFi Aggregation Networks through SDN WSA 2018 March 14, 2018, Bochum, Germany Suzan Bayhan and Anatolij Zubow Technische Universität Berlin, Germany 1
2 Trends in current cellular networks Time 2
3 Trends in current cellular networks wireless data traffic data price Time 2
4 Trends in current cellular networks wireless data traffic data price profits? Time 2
5 Trends in current cellular networks wireless data traffic data price profits? Time Mobile Network Operators need cost-effective solutions for capacity expansion 2
6 LTE operators interest in unlicensed operation Spectrum: free resource (no license fees) Unlicensed WiFi network: ubiquitous infrastructure, mature technology well accepted by public 3
7 Several options to use unlicensed spectrum Spectrum of WiFi LTE-Unlicensed, Licensed-Assisted Access LAA, MulteFire WiFi itself LTE/WiFi aggregation LWA Wifi offloading 4
8 Several options to use unlicensed spectrum Spectrum of WiFi Coexistence is a big challenge! WiFi itself Lower throughput improvement LTE spectrum Unlicensed spectrum, 5GHz 5 GHz 2.4 GHz 5
9 Several options to use unlicensed spectrum Spectrum of WiFi Coexistence is a big challenge! WiFi itself Lower throughput improvement LTE spectrum Unlicensed spectrum, 5GHz 5 GHz 2.4 GHz This talk 5
10 LWA: LTE-WiFi Aggregation Flow 3GPP Release 13, dual connectivity enb Xw WiFi AP Already existing carrier-wifi APs Direct interaction between the enb and WiFi Traffic splitting at the enb Xw: data and control messaging How to split the traffic? 6
11 LWA: LTE-WiFi Aggregation Flow enb Xw Wireless- Termination (WT) WiFi AP 3GPP Release 13, dual connectivity Already existing carrier-wifi APs Direct interaction between the enb and WiFi Traffic splitting at the enb Xw: data and control messaging How to split the traffic? 6
12 LWA: LTE-WiFi Aggregation Flow enb Xw Wireless- Termination (WT) WiFi AP 3GPP Release 13, dual connectivity Already existing carrier-wifi APs Direct interaction between the enb and WiFi Traffic splitting at the enb Xw: data and control messaging How to split the traffic? LWA does not define how this splitting should be performed. 6
13 Traffic splitting might be suboptimal Wireless- Termination (WT) AP1 AP2 AP3 7
14 Traffic splitting might be suboptimal Wireless- Termination (WT) AP1 AP2 AP3 7
15 Traffic splitting might be suboptimal Wireless- Termination (WT) AP1 AP2 AP3 7
16 Traffic splitting might be suboptimal Wireless- Termination (WT) AP1 AP2 AP3 7
17 Traffic splitting might be suboptimal Wireless- Termination (WT) AP1 AP2 AP3 Expected capacity cannot be realized! Multiple enbs connected to the same AP 7
18 Central the traffic split function decision Traffic split function controller (TSFC) Our idea: centralise the traffic split function decision Traffic split function(tsf) Traffic split function(tsf) Traffic split function(tsf) 8
19 Central the traffic split function decision Traffic split function controller (TSFC) Our idea: centralise the traffic split function decision Traffic split function(tsf) Traffic split function(tsf) Traffic split function(tsf) Centralization gain More flexibility Cheap, simple edge-devices In line with the C-RAN trend Possible with SDN idea 8
20 Where to locate the TSFC? TSFC TSFC 1 Edge-TSFC TSF TSF Legacy LWA 9
21 Where to locate the TSFC? TSFC TSFC 1 Edge-TSFC TSF TSF 10
22 Where to locate the TSFC? TSFC TSF TSFC TSF 1 Edge-TSFC 10
23 Where to locate the TSFC? TSFC TSFC TSF TSF 1 Edge-TSFC 10
24 Where to locate the TSFC? TSFC TSFC 2 Fog-TSFC TSF TSF 1 Edge-TSFC 10
25 Where to locate the TSFC? TSFC 2 Fog-TSFC TSF TSF 1 Edge-TSFC 11
26 Where to locate the TSFC? TSFC 2 Fog-TSFC TSF TSF 1 Edge-TSFC 11
27 Where to locate the TSFC? TSFC 3 Cloud-TSFC 2 Fog-TSFC TSF TSF 1 Edge-TSFC 11
28 Where to locate the TSFC? TSFC 3 Cloud-TSFC Higher centralization gain 2 Fog-TSFC TSF TSF 1 Edge-TSFC Lower latency Low comm. overhead 11
29 Goal of this paper Understand how decoupling TSFC from TSF changes the architecture and operation of LWA Determine key parameters affecting controller, i.e., TSFC, placement Analyze preliminary analysis on TSFC location under various scenarios 12
30 Goal of this paper Understand how decoupling TSFC from TSF changes the architecture and operation of LWA Determine key parameters affecting controller, i.e., TSFC, placement Analyze preliminary analysis on TSFC location under various scenarios 13
31 Change in the architecture New interfaces are needed 14
32 Flexibility but new interfaces Xe interface: enb-to-tsfc communication Three instances: Xee, Xef, Xec Xt interface: TSF-to-TSFC communication Edge Fog Cloud Three instances: Xte, Xtf, Xtc Difference interface delays 15
33 Flexibility but new interactions TSFC has two tasks: mode assignment: LTE-only or LWA mode traffic split: for LWA mode, how to deliver packets TSFC may perform these tasks in two modes: reactive: upon every change trigger the r-tsfc proactive: acts only periodically p-tsfc 16
34 Flexibility but new data structures FMT (FMT: flow match table) 17
35 Mode assignment in edge/fog/cloud TSFC rtsfc: every time a new flow is created, trigger rtsfc cloud-tsfc: not scalable impractical for short-lived flows or highly mobile users fog-tsfc: similar problems with cloud-tsfc depends on number of enbs controlled by a fog-controller 18
36 Mode assignment in edge/fog/cloud TSFC rtsfc: every time a new flow is created, trigger rtsfc cloud-tsfc: not scalable impractical for short-lived flows or highly mobile users fog-tsfc: similar problems with cloud-tsfc depends on number of enbs controlled by a fog-controller edge- TSFC r-tsfc 18
37 Mode assignment in edge/fog/cloud TSFC rtsfc: every time a new flow is created, trigger rtsfc cloud-tsfc: not scalable impractical for short-lived flows or highly mobile users fog-tsfc: similar problems with cloud-tsfc depends on number of enbs controlled by a fog-controller edge- TSFC r-tsfc p-tsfc cloud- TSFC 18
38 Goal of this paper Understand how decoupling TSFC from TSF changes the architecture and operation of LWA Determine key parameters affecting controller, i.e., TSFC, placement Analyze preliminary analysis on TSFC location under various scenarios 19
39 Where to deploy the TSFC? depends on the targeted reactivity level small-scale changes medium-scale changes Long-term changes TSFC??? TSF WT 20
40 Where to deploy the TSFC? depends on the targeted reactivity level small-scale changes medium-scale changes Long-term changes TSFC?? controller delay budget (τ max ): time period the system state remains static considering a target reactivity level? TSF WT 20
41 Cloud-first assignment controller delay budget τ max if τ max >= τ c then cloud-tsfc τ c = 2max(Xwc, Xec, Xtc) τ c else if τ max >= τ f then fog-tsfc else: edge-tsfc τ max τ f TSF WT 21
42 Parameters affecting controller placement controller delay budget: τ max = min(,, ) Small-scale: channel coherence time, flow duration Medium-scale: channel decorrelation time due to shadowing, flow duration Long-time scale: time to handover, flow duration 22
43 React to even small scale changes channel coherence time, flow duration controller delay budget: τ max = min(τ l c, τ w c, τf) where τ ch c/fv LTE link LTE frequency WiFi link WiFi frequency Speed v 23
44 React to medium scale changes channel decorrelation time due to shadowing, flow duration τ max = min(τ l sh, τ w sh, τf) where τ sh dsh/v dsh: de-correlation distance of shadowing T. Abbas, K. Sjoberg, J. Karedal, and F. Tufvesson, A measurement based shadow fading model for vehicle-to-vehicle network simulations, International Journal of Antennas and Propagation vol
45 React to long term changes time to handover, flow duration: τ max = min(τ w, τ l, τf) dlte dwifi τ w 25
46 Goal of this paper Understand how decoupling TSFC from TSF changes the architecture and operation of LWA Determine key parameters affecting controller, i.e., TSFC, placement Analyze preliminary analysis on TSFC location under various scenarios 26
47 Preliminary analysis Monte-Carlo simulations in Python (10 6 realizations) CDF of flow durations in [Yang15], a dataset collected from Chinese nw. operator Mobility according to [Maternia16] static, low pedestrian, medium (slow vehicle), high (fast vehicle) LTE frequency: 2.3 GHz, WiFi: 2.4 and 5 GHz Edge, fog, cloud interface delays: (5, 10, 50 ms) J. Yang, W. Li et al., Characterizing and modeling of large-scale traffic in mobile network, in IEEE WCNC 2015 M. Maternia, S. E. El Ayoubi et al., 5G PPP use cases and performance evaluation models, 5G PPP,
48 Empirical CDF of controller delay budget Stationary users High mobility vehicular flow duration determines the channel dynamics determines budget the budget 28
49 Location of TSFC GHz) Small scale Medium scale Long-term Fraction of times TSFC is placed in cloud, fog, or edge 29
50 Location of TSFC GHz) Small 2.4 GHz Small 5GHz Similar but lower controller delay budget as channel@5ghz changes faster 30
51 Summary and future work A flexible LWA architecture with SDN Change in the architecture and operation Promises higher centralisation gains: future work to quantify the gains future work to develop a traffic split function and evaluate using NS-3 simulations and prototype experiments 31
52 Summary and future work A flexible LWA architecture with SDN Change in the architecture and operation Promises higher centralisation gains: future work to quantify the gains future work to develop a traffic split function and evaluate using NS-3 simulations and prototype experiments Enabling Flexibility of Traffic Split Function in LTE-WiFi Aggregation Networks through SDN Suzan Bayhan and Anatolij Zubow, TU Berlin Thank you!31
53 Backup slides 32
54 LTE-WLAN interworking vs. LWA Figure source: unlicensed-lte-paper.pdf 33
55 PDCP level aggregation Figure source:
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