A tutorial survey on vehicular ad hoc networks

H. Hartenstein, K. P. Laborteaux

This review will be very helpful in preparing our paper for VTC.

... roadside units.
... 802.11p -> Csma also in vehicular networks
... periodical and event-driven traffic
... congestion in the roadnetwork might translate into congestion in the radio access network

A new technique for satellite broadcast channel communication

F.Borgonovo and L.Fratta

The authors propose an hybrid aloha/reservation protocol. It behaves as aloha until a collision occurs. Then switches to reservation.

I am specially interested in this sentence:
Moreover we can say that the S-ALOHA technique is very suitable for low traffic, single-packet, condiditions even if a control scheme has to be used to guarantee the system stability.

and cites this paper:
Lam, S. and Kleinrock, L. "Packet Switching in a Multiaccess Broadcast Channel: Dynamic Control Procedures"

FreeMAC: Framework for Multi-Channel MAC Development on 802.11 Hardware

Ashish Sharma, Elizabeth M. Belding

The authors present a solution for multi-channel wifi. What really impressed me is the high degree of control over the network interface that is achieved. If I had the chance to reproduce their work, it would be applicable to suppress acks or to test our csma/eca proposals.

Using chunk collision avoidance to optimize p2p live

When a group of nodes under the same authoritative domain (or ISP) collectively download a P2P video stream, it is desirable to minimize inter-ISP traffic. Ideally, each chunk of the stream would be downloaded by one of the nodes from an external peer, and then shared among all the nodes under the same ISP. If the same chunk is downloaded from external sources by to different peers of the same ISP, we can say that a "collision" happened. Enhanced collision avoidance techniques from MAC layer can be used in order to optimize the P2P live streaming download.

Will IPTV ride the peer-to-peer stream?

Marfia, G., Sentivelli, A., Tewari, S., Gerla, M. and Kleinrock, L.

The article concludes that ADSL's asimmetry is the main obstacle in the way of high-quality P2P IP TV.

Multiuser Detection in Large Systems with an unknown Number of Users

Adrià Tauste Campo, Albert Guillén i Fàbregas and Ezio Biglieri

It addresses the same problem as the previous article. To my particular taste, this was much more understandable than the previous one, even though it is still ongoing work.

Large-system analysis of a CDMA dynamic channel under a Markovian input process

Ezio Biglieri∗ , Emanuele Grossi† , Marco Lops† , and Adrià Tauste Campo


It addresses the problem of a communication system with an unknown number of users. It is curious that to see that the estimation of the number of users is completely different from what I have been reading so far. Even if the problem statement might sound similar, it is actually a completely different problem.

High-Performance Wireless Ethernet

Heegard, Coffey, Gummadi, Murphy, Provencio, Rossin, Schrum, Shoemake

A review of IEEE 802.11 in its early stages with emphasis on coding.

learning MAC protocol for sensor networks

Assume a network of sensor that periodically transmit some data. The period T is the same for all the sensors. Assume also that the time required to tranmsit a packet is much shorter than the period Tx << T. Then we propose a MAC protocol that, in case of collision, re-attempt transmission after a random period of time R, Tx<< R << T. After a successful transmission, the sensor delays exactly T the new transmission attempt.

After the learning period, the system will operate collision-free. Further, each node will transmit deterministically each T seconds. The receiver can sleep for most of the time, and only wake up when it knows that there will be an incoming packet.

Weighted Fair Uplink/Downlink Access Provisioning in IEEE 802.11e WLANs

Feyza Keceli, Inanc Inan, and Ender Ayanoglu

A comprehensive solution to the uplink/downlink unfairness in EDCA. The goodies include:
i) Fully .11e compliant.
ii) Smooth interaction with TCP.
iii) Maintains the priorities of the queues.
iiii) Satisfactory QoS for real-time flows.

EBA: An Enhancement of the IEEE 802.11 DCF via Distributed Reservation

Jaehyuk Choi, Joon Yoo, Sunghyun Choi, Member, IEEE, and Chongkwon Kim, Member, IEEE

Very interesting paper. I need to organize my thoughts. The core idea is brilliant: the stations advertise their backoff values. I have the feeling that the proposed implementation can be improved.

Merits: It proactively prevent collisions from the very beginning. In comparition, CSMA/ECA has a transitory operation with performance similar to legacy CSMA/CA. In can tolerate a large number of stations delivering acceptable throughput and fairness.

Shortcomings: It requires the modification of the MAC headers, which makes the coexistence with legacy stations trickier. The collision avoidance mechanism relies in additional signaling included in those header. If errors or collisions occur, that signaling is lost and the operation of EBA falls to the same as legacy CSMA/CA.