Contents
- 1 What is Maca and how it works in computer network?
- 2 Which technique is used to resolve hidden terminal problem?
- 3 What is difference between Maca and macaw protocol?
- 4 What does Maca stand for?
- 5 What is the best solution to solve hidden node problem?
- 6 What is are the disadvantages of hidden terminal problem?
- 7 How does multiple access with Collision Avoidance ( MACA ) work?
- 8 What are the conditions for maca to work?
- 9 How does Maca work in a time slot?
What is Maca and how it works in computer network?
Multiple Access with Collision Avoidance (MACA) is a slotted media access control protocol used in wireless LAN data transmission to avoid collisions caused by the hidden station problem and to simplify exposed station problem.
RTS/CTS mechanism to resolve the hidden terminal problem RTS/CTS is the mechanism used by the 802.11 wireless networking protocol to resolve the hidden terminal problem. It uses two frames known as RTS and CTS to check medium for collision avoidance. When a node wants to send data it will first send the RTS signal.
What are the hidden station and exposed station problems?
A significant difference between wired and wireless LANs is the fact that, in general a fully connected topology between the WLAN nodes cannot b assumed. This problem gives rise to ‘hidden’ and ‘exposed’ station problems. Hidden Terminal: As seen in the above problem, the transmission range of A reaches B but not C.
What is difference between Maca and macaw protocol?
Advantages over MACA : The fairness of MACAW is much better than MACA. It handle hidden and exposed node problem better than MACA. ACK signal is send to the MAC layer, after every data frame. It also incorporate carrier detecting to additionally diminish collision.
What does Maca stand for?
MACA
| Acronym | Definition |
|---|---|
| MACA | Military Assistance to Civil Authorities |
| MACA | Mid-Air Collision Avoidance |
| MACA | Milwaukee Area Compensation Association |
| MACA | Mental After Care Association (United Kingdom) |
What is hidden and exposed terminal problems?
The hidden terminal problem is known to degrade the throughput of wireless networks due to collisions, while the exposed terminal problem results in poor performance by wasting valuable transmission opportunities.
Increasing transmitting power Increasing the transmission power of the nodes can solve the hidden node problem by allowing the cell around each node to increase in size, encompassing all of the other nodes. This configuration enables the non-hidden nodes to detect, or hear, the hidden node.
This problem is caused by signal coverage constraints, resulting in network nodes not being able to detect transmissions performed by other nodes. This problem can produce collisions due to concurrent transmissions, potentially degrading the performance of the communications in the network.
How can we avoid hidden and exposed node problem?
The other methods that can be employed to solve hidden node problem are :
- Increase Transmitting Power From the Nodes.
- Use omnidirectional antennas.
- Remove obstacles.
- Move the node.
- Use protocol enhancement software.
- Use antenna diversity.
How does multiple access with Collision Avoidance ( MACA ) work?
It is an alternate to Carrier-sense multiple access (CSMA) which have the hidden terminal problem and the exposed terminal problem. The main condition for MACA to work, is that the stations are in sync with frame sizes and data speed.
What are the conditions for maca to work?
The main condition for MACA to work, is that the stations are in sync with frame sizes and data speed. It includes transmission of two frame called RTS and CTS preceding information transmission. RTS means Request to Send and CTS means Clear to Send. Stations near to the transmitting station can hear RTS and remains silent to here the CTS.
How does Maca work with 802.11 RTS / CTS?
It also provides solution to the exposed terminal problem. The MAC layer protocol IEEE 802.11 RTS/CTS has been adopted from MACA. The MACA protocol works with the condition that the stations are synchronized and frame sizes and data speed are the same.
How does Maca work in a time slot?
MACA is a non-persistent slotted protocol. This implies that if the medium is detected as busy, a station waits for a random time period after the beginning of a time slot and then it sends an RTS. This assures fair access to the medium.