Feasibility of Coordinated Transmission for HEW
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Feasibility of Coordinated Transmission for HEW. Date: 2013-09-16. Authors:. Abstract. This presentation discuss the feasibility of using coordinated transmission between adjacent APs for future WLAN networks. As a similar technique, CoMP in LTE has been introduced briefly.

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Feasibility of coordinated transmission for hew

Feasibility of Coordinated Transmission for HEW

Date: 2013-09-16

Authors:

Yunzhou Li, Tsinghua Univ.


Abstract

Abstract

  • This presentation discuss the feasibility of using coordinated transmission between adjacent APs for future WLAN networks.

  • As a similar technique, CoMP in LTE has been introduced briefly.

  • The potential gain derived from coordinated transmission has been analyzed, by comparison of LTE CoMP and coordinated transmission in WiFi and experiment results.

  • Some simple coordinated scheme has been introduced.

Yunzhou Li, Tsinghua Univ.


Background motivation

Background &Motivation

  • With the increase of AP density, the inter-BSS interference will be the dominant obstacle for increase of area throughput.

  • It is very difficult to work well If there existed a good path between adjacent two AP due to DL-UL interference between the two AP.

  • Different from wired technologies; adding multiple APs in the same vicinity doesn’t help if

    • Interference becomes a major issue for dense environment.

11-13-0098-00-0wng-802-11-looking-ahead-to-the-future-part-II

Yunzhou Li, Tsinghua Univ.


The feasibility of coordination transmission

The Feasibility of Coordination Transmission

  • As showed in the following figure, Access Controller (AC) are widely used in practice

    • AC can play a role of controller of coordination transmission between adjacent APs


The feasibility of coordination transmission1

The Feasibility of Coordination Transmission

  • Enterprise is evolving towards a cloud-based model

    • No longer files and information are stored on local machines

  • Mobile access to cloud is expected to increase with the increase of smart mobile devices.

Enterprise WiFi

11-13-0098-00-0wng-802-11-looking-ahead-to-the-future-part-II

Yunzhou Li, Tsinghua Univ.


Coordinated multi point comp transmission and reception in lte

Coordinated Multi-Point (CoMP) transmission and reception In LTE

  • Joint Transmission (JT)

    • Simultaneous data transmission from multiple points (part of or entire CoMP cooperating set) to a single UE or multiple UEs in a time-frequency resource

  • Dynamic point selection (DPS)/muting

    • Data transmission from one point (within the CoMP cooperating

      set) in a time-frequency resource

  • Coordinated Scheduling/Beamforming (CS/CB)

    • Data for an UE is only available at and transmitted from one point

    • scheduling/beamforming decisions are made with coordination among points corresponding to the CoMP cooperating set.

3GPP TR 36.819 Coordinated multi-point operation for LTE physical layer aspects

Yunzhou Li, Tsinghua Univ.


The difference between td lte and wifi for coordinated transmission

The Difference between TD-LTE and WiFi for Coordinated Transmission

  • In cellular systems of TD-LTE, all the eNBs are synchronized in symbol and slot

  • Whereas each AP in Wi-Fi systems decide to transmit/receive according to itself and don’t take care of other adjacent AP’s TX/RX.

  • In addition, the deployment of eNB are chosen base on well-planning, which is very different from selection of AP’s position.

Yunzhou Li, Tsinghua Univ.


The difference between td lte and wi fi for coordination transmission

The Difference between TD-LTE and Wi-Fi for Coordination Transmission

  • Besides, there is a significant difference in use of time and frequency block between cellular and Wi-Fi.

Yunzhou Li, Tsinghua Univ.


Some coordinated transmission schemes

Some Coordinated Transmission Schemes

  • Integrated coordinated transmission mechanism with Wi-Fi networks

    • All the time domain resource is divided into two categories: Coordinated TX/RX Intervals(CTRI) and Non-Coordinated TX/RX Intervals(NCTRI) which is scheduled and decided by coordination controller according to the amount of STA and their distribution

Yunzhou Li, Tsinghua Univ.


Some coordinated transmission schemes1

Some Coordinated Transmission Schemes

  • Coordinated power allocation

    • The scheme of AP selection is one of special case

Yunzhou Li, Tsinghua Univ.


Some coordinated transmission schemes2

Some Coordinated Transmission Schemes

  • Coordinated frequency band allocation

  • Joint dynamic allocation of frequency and power

    • Which is the combining case of coordinated power allocation and coordinated frequency band allocation

Yunzhou Li, Tsinghua Univ.


Some coordinated transmission schemes3

Some Coordinated Transmission Schemes

  • Joint Transmission based one joint precoding

    • like SU-MIMO / MU-MIMO in 802.11ac

    • The combing channel is and the precoding matrix is decided based on

    • MU-MIMO can be

      combined to the scheme

    • JT need high-resolution synchronization in time and frequency among the adjacent APs, which can be implemented by CPRI / IEEE 1588, etc.

Coherent

Yunzhou Li, Tsinghua Univ.


Experiment of multi ap for dense wlan

Experiment of Multi-AP for Dense WLAN

  • Each STA can detect multiple APs within its reception range.


Experiment of multi ap for dense wlan1

Experiment of Multi-AP for Dense WLAN

  • Strategies:

    • In UL, multi-AP receive the STA’s signal simultaneously and check it by CRC.

    • In DL, AC chooses one AP from multi-AP as transmit point according to channel condition and load balance.

StarEast


Experiment of multi ap for dense wlan2

Experiment of Multi-AP for Dense WLAN

  • Combining with optimal physical carrier sensing, more 100% gain can be achieved in both UL and DL.

UL

DL

Yunzhou Li, Tsinghua Univ.


Remarks on coordination gain

Remarks on Coordination Gain

  • Although only about 15% gain from CoMP in LTE can be achieved, considerable gain from simple coordinated scheme has been showed in our experiment.

  • In our opinion, the possible reason is CoMP gain in LTE derives from SINR increase for cell-edge UEs who are at low rates, so the contribution for the whole cell throughput is not considerable.

  • However, the gain from coordinated transmission in WLAN is from the decrease of collision and resulting in the increase of transmission opportunity.

Yunzhou Li, Tsinghua Univ.


Summary

Summary

  • It is feasible for integrating coordinated transmission in to WLAN for HEW by extending the role of AC.

  • For analysis of potential gain, CoMP in LTE has been introduced briefly.

  • Further, the difference between TD-LTE and WiFi for coordinated transmission has been summed up and some simple coordinated scheme has been introduced.

  • Finally, the potential gain for HEW has been analyzed.

Yunzhou Li, Tsinghua Univ.


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