没有合适的资源?快使用搜索试试~ 我知道了~
首页IEEE 802.11ax: High-Efficie ncy WLANs
IEEE 802.11ax: High-Efficie ncy WLANs
需积分: 0 10 下载量 55 浏览量
更新于2023-05-18
评论
收藏 198KB PDF 举报
IEEE 802.11ax-2019 will replace both IEEE 802.11n-2009 and IEEE 802.11ac-2013 as the next high-throughput WLAN amendment. In this article, we review the expected future WLAN scenarios and use cases that justify the push for a new PHY/MAC IEEE 802.11 amendment. After that, we overview a set of new technical features that may be included in the IEEE 802.11ax-2019 amendment, and describe both their advantages and drawbacks. Finally, we discuss ome of the network-level functionalities that are required to fully improve the user experience in next-generation WLANs and note their relation with other ongoing IEEE 802.11 amendments.
资源详情
资源评论
资源推荐
IEEE Wireless Communications • February 2016
38
1536-1284/16/$25.00 © 2016 IEEE
The author is with Uni-
versitat Pompeu Fabra,
Barcelona
AbstrAct
IEEE 802.11ax-2019 will replace both IEEE
802.11n-2009 and IEEE 802.11ac-2013 as the
next high-throughput WLAN amendment. In this
article, we review the expected future WLAN
scenarios and use cases that justify the push for a
new PHY/MAC IEEE 802.11 amendment. After
that, we overview a set of new technical features
that may be included in the IEEE 802.11ax-2019
amendment, and describe both their advantages
and drawbacks. Finally, we discuss some of the
network-level functionalities that are required to
fully improve the user experience in next-gener-
ation WLANs and note their relation with other
ongoing IEEE 802.11 amendments.
IntroductIon
IEEE 802.11 wireless local area networks
(WLANs) [1] are a cost-efficient solution for
wireless Internet access that can satisfy most cur-
rent communication requirements in domestic,
public, and business scenarios.
Similar to other wireless technologies, WLANs
have evolved by integrating the latest technolog-
ical advances in the field as soon as they have
become sufficiently mature, aiming to continuous-
ly improve spectrum utilization and raw WLAN
performance. IEEE 802.11n-2009 adopted sin-
gle-user multiple-input multiple-output (SU-MI-
MO), channel bonding, and packet aggregation.
Those mechanisms were further extended in IEEE
802.11ac-2013, which also introduced downlink
multi-user (MU) MIMO transmissions. In addi-
tion, new amendments such as IEEE 802.11af-
2013 and IEEE 802.11ah-2016 are further
expanding the application scenarios of WLANs,
which include cognitive radio, long-range commu-
nication, advanced power saving mechanisms, and
support for machine-to-machine (M2M) devices.
Partly because of their own success, next-gen-
eration WLANs face two main challenges. First,
they must address dense scenarios, which is
motivated by the continuous deployment of new
access points (APs) to cover new areas and pro-
vide higher transmission rates. Second, the cur-
rent evolution of Internet usage toward real-time
high-definition audio and video content will also
significantly increase users’ throughput needs in
the coming years.
To address those challenges, the High-Effi-
ciency WLAN (HEW) Task Group [2] is current-
ly working on a new high-throughput amendment
named IEEE 802.11ax-2019. This new amend-
ment will develop new physical (PHY) and medi-
um access control (MAC) layer enhancements
to further improve the WLAN performance,
with a focus on the throughput and battery
duration. This article overviews some of those
new enhancements, and describes the potential
benefits and drawbacks of each one. We have
grouped these enhancements into four main cat-
egories: spatial reuse, temporal efficiency, spec-
trum sharing, and multiple-antenna technologies.
Moreover, we also discuss several key system-lev-
el improvements for next-generation WLANs, as
in addition to the IEEE 802.11ax-2019 amend-
ment, they will likely implement other in-prog-
ress amendments such as IEEE 802.11aq-2016
(pre-association discovery of services), IEEE
802.11ak-2017 (bridged networks), and IEEE
802.11ai-2016 (fast initial link setup time) to sat-
isfy the created expectations.
scenArIos, use cAses, And
r
equIrements
The forecast number of devices and networks,
and traffic characteristics and user demands for
the 2020–2030 decade motivate the development
of a new PHY/MAC IEEE 802.11 amendment to
cope with the new challenges and usages WLANs
will face [2].
One of the most representative characteris-
tics of WLANs is the use of carrier sense multiple
access with collision avoidance (CSMA/CA) as
the MAC protocol. It offers a reasonable trade-
off between performance, robustness, and imple-
mentation costs. Using CSMA/CA, when a node
has a packet ready for transmission, it listens to
the channel. Once the channel has been detect-
ed as free (i.e., the energy level on the channel
is lower than the clear channel assessment, CCA,
threshold), the node starts the backoff procedure
by selecting a random initial value for the backoff
counter. The node then starts decreasing the back-
off counter while sensing the channel. Whenever a
transmission, either from other nodes within the
same WLAN or belonging to other WLANs, is
detected on the channel, the backoff counter is
paused until the channel is detected to be free
again, at which point the countdown is resumed.
When the backoff counter reaches zero, the node
starts transmitting. Figure 1a shows an example of
CSMA/CA operation.
dense WLAn scenArIos
Providing high data rates in scenarios where
the density of WLAN users is very high (e.g., 1
user/m
2
) requires the deployment of many APs
Boris Bellalta
IEEE 802.11ax: HIgH-EffIcIEncy WLans
a c c E p t E d f r o m o p E n c a L L
danny63
- 粉丝: 1
- 资源: 10
上传资源 快速赚钱
- 我的内容管理 收起
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
会员权益专享
最新资源
- zigbee-cluster-library-specification
- JSBSim Reference Manual
- c++校园超市商品信息管理系统课程设计说明书(含源代码) (2).pdf
- 建筑供配电系统相关课件.pptx
- 企业管理规章制度及管理模式.doc
- vb打开摄像头.doc
- 云计算-可信计算中认证协议改进方案.pdf
- [详细完整版]单片机编程4.ppt
- c语言常用算法.pdf
- c++经典程序代码大全.pdf
- 单片机数字时钟资料.doc
- 11项目管理前沿1.0.pptx
- 基于ssm的“魅力”繁峙宣传网站的设计与实现论文.doc
- 智慧交通综合解决方案.pptx
- 建筑防潮设计-PowerPointPresentati.pptx
- SPC统计过程控制程序.pptx
资源上传下载、课程学习等过程中有任何疑问或建议,欢迎提出宝贵意见哦~我们会及时处理!
点击此处反馈
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功
评论0