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doc.: IEEE 802.11-13/1351r0
Submission
Nov. 2013
Slide 1
User Scheduling for DL-MU-MIMO Transmission with QoE Constraints
• This document provides a joint user scheduling scheme for the DL-MU-MIMO transmission which takes into account diverse quality of experience (QoE) requirements of mobile devices.
• By adding the proposed user scheduling scheme, HEW could offer improvements to the overall performance enhancement to support high-data-rate multiple users with diverse QoE requirements.
Slide 3
Nov. 2013
doc.: IEEE 802.11-13/1351r0
Submission
General Characteristics of System Model
• Spatially uncorrelated flat fading channel
• Perfect current channel state information (CSI)
• Singular value decomposition based Block Diagonalization method
• The scheduling decision is made based on QoE requirements, current CSI and current queuing state information of all MUs
Slide 4
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doc.: IEEE 802.11-13/1351r0
Submission
General Characteristics of System Model
Slide 5
Nov. 2013
User
Selection
Coding&
Modulation
Coding&
Modulation
SVD-BD
Precoding
…
User 1 data
User K data
Access Point
DetectionDemodulation
&Decoding
User 1 data
DetectionDemodulation
&Decoding
User K data
Mobile users
NT
NR
NR
… … …
doc.: IEEE 802.11-13/1351r0
Submission
Proposed User Scheduling Scheme
Slide 6
Nov. 2013
doc.: IEEE 802.11-13/1351r0
Submission
Proposed User Scheduling Scheme
Slide 7
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doc.: IEEE 802.11-13/1351r0
Submission
Proposed User Scheduling Scheme
The proposed user scheduling scheme can be summarized as the following four steps:
1) Each MU estimates its current CSI and uploads it to AP using the uplink dedicated pilots.
2) AP receives the CSI from all MUs and obtains the QSI through observing MUs’ buffers.
Slide 8
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doc.: IEEE 802.11-13/1351r0
Submission
Proposed User Scheduling Scheme
Slide 9
Oct. 2013
doc.: IEEE 802.11-13/1351r0
Submission Slide 10
Nov. 2013
Step 3b: AP choose a possible user subset l, allocate power using (6) and calculate the utility
value Fl using (5)
Step 3c: compare Fl with F*, and set F*= max{Fl ,F*} and l* = argmax{Fl ,F*}
Examined all possible subsets?
Exit and output
Yes
No
User with good channel quality or urgent QoE requirements will be allocated with higher power and
thus have larger utility value
Step 1: each MU estimates its current CSI
Step 2: AP collects the QoE requirements, current CSI and QSI of each MU
Step 3a: AP initializes the optimal user subset l *= 0 and utility value F*= 0
Procedure of proposed user scheduling scheme
doc.: IEEE 802.11-13/1351r0
Submission
Conclusion
• This document provides a joint user scheduling scheme for the DL-MU-MIMO transmission which takes into account diverse QoE requirements of mobile devices.
• The proposed scheme incorporates both the source statistics and queue dynamics to determine the subset of users chosen for each scheduling slot.
• The proposed scheme can not only maintain the QoE requirements in the presence of bursty data traffic but also maximize the system throughput by exploiting the multiplexing diversity gain and multiuser selection gain.
Slide 11
Nov. 2013
doc.: IEEE 802.11-13/1351r0
Submission
References
[1] 12/0910r0, Carrier oriented WIFI for cellular offload, Orange.
[2] 13/1158r0, Video Traffic and Applications for HEW, William Carney.
[3] 13/0850r0, Quantitative QoE Requirements for HEW, Huai-Rong Shao.
[4] 13/1090r2, Non-linear pre-coding MIMO Scheme for next generation WLAN, Xiang Gao.
[5] 13/1154r0, DL-MU-MIMO Transmission with Unequal Bandwidth, Yongming Huang.
[6] 13/0865r2, Video Data Rate for HEW, Huai-Rong Shao.
[7] F. Kelly, “Notes on effective bandwidths,” in Stochastic Networks: Theory and Applications, vol. 4, Royal Statistical Society Lecture Notes Series, Ed. Oxford: Oxford Statistical Science Series Oxford Univ. Press, 1996, pp. 141–168.
[8] G. Caire and S. Shamai, “On the achievable throughput of a multi-antenna Gaussian broadcast channel,” IEEE Trans. Inform. Theory, vol. 49, no. 7, pp. 1691-1706, Jul. 2003.
[9] J. S. Harsini and F. Lahouti, “Adaptive transmission policy design for delay-sensitive and bursty packet traffic over wireless fading channels,” IEEE Trans. Wireless Commun., vol. 8, no. 2, pp. 776–786, Feb. 2009..