1 research outputs found
Leader-Contention-Based User Matching for 802.11 Multiuser MIMO Networks
In multiuser MIMO (MU-MIMO) LANs, the achievable throughput of a client
depends on who are transmitting concurrently with it. Existing MU-MIMO MAC
protocols however enable clients to use the traditional 802.11 contention to
contend for concurrent transmission opportunities on the uplink. Such a
contention-based protocol not only wastes lots of channel time on multiple
rounds of contention, but also fails to maximally deliver the gain of MU-MIMO
because users randomly join concurrent transmissions without considering their
channel characteristics. To address such inefficiency, this paper introduces
MIMOMate, a leader-contention-based MU-MIMO MAC protocol that matches clients
as concurrent transmitters according to their channel characteristics to
maximally deliver the MU-MIMO gain, while ensuring all users to fairly share
concurrent transmission opportunities. Furthermore, MIMOMate elects the leader
of the matched users to contend for transmission opportunities using
traditional 802.11 CSMA/CA. It hence requires only a single contention overhead
for concurrent streams, and can be compatible with legacy 802.11 devices. A
prototype implementation in USRP-N200 shows that MIMOMate achieves an average
throughput gain of 1.42x and 1.52x over the traditional contention-based
protocol for 2-antenna and 3-antenna AP scenarios, respectively, and also
provides fairness for clients.Comment: Accepted on 12-Apr-2014 for publications at IEEE Transactions on
Wireless Communication