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Medium access control (MAC) protocol for wireless ATM
| Details |
Inventors: Hulyalkar, Samir N.; Ngo, Chiu; Du, Yonggang;
Assignee: Phillips Electronics North America Corp. (New York, NY)
Primary Examiner: Hsu; Alpus H.
Assistant Examiner:
Attorney, Agent or Firm: Gross; Russell
A protocol, method, and apparatus for managing network communications which are particularly well suited for ATM communications across a wireless medium. Contiguous time slots within a frame are allocated to each node having traffic to send. Each node is assured a nominal bandwidth, and excess bandwidth is distributed by demand. The allocation of excess bandwidth can be dependent upon the size of the buffer at each node, as well as the time-criticality of each message. Nodes communicate their requests for allocation by appending such control information to the first of their transmitted packets. The allocation, of each node's transmit and receive time slots, is transmitted to all the nodes at the beginning of each frame. Thereafter, each node need not participate on the network until their allocated time periods, thereby allowing portable devices to enter inactive states to conserve power. The network is operated in a connection mode; connections are established in a relatively non-interfering manner by the use of periodically occurring beacons. Inactive, unconnected, nodes need only monitor the network during these beacon periods, further allowing for power conservation. |
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DETAILED DESCRIPTION Essentially, the invention describes a method for controlling the access to the communications medium within a wireless network protocol, consistent with an underlying ATM network structure and protocol.
The access control in accordance with this invention comprises the following features: an optimized Control Data Frame (CDF) structure to minimize turnaround time; a Superslot data structure for Uplink signalling; a generalized Slot Allocation Policy at the MAC level which integrates the allocation uplink and downlink slots; a Buffer Overflow Control Policy at the MAC level; and, a Beacon-based implementation for MAC management services.
The optimized Control Data Frame (CDF) minimizes the turnaround time associated with transmissions in a wireless network by consolidating the control and downlink information, and optimizing the control and uplink information transmissions from each transmitter.
In addition to minimizing the turnaround time, this structure also provides a deterministic nature to the communication patterns, allowing the terminal devices to perform other functions during inactive periods, or, in the case of battery powered devices, allowing them to conserve power during these inactive periods.
Associated with the Control Data Frame is the use of a Superslot architecture to allow the piggybacking of uplink control information onto a uplink data transmission to optimize the communications from each wireless device to a central, or base, system.
This structure allows for minimal overhead, particularly the overhead required for synchronizing packets from each transmitter.
The generalized slot allocation policy supports the ATM QoS concept of a nominal bandwidth allocation for each device, and, in conjunction with the Buffer Overflow Control policy, allows for the reallocation of bandwidth for bursts of packets, consistent with the goals of ATM.
Additionally, any remaining excess bandwidth is efficiently allocated among devices to optimize overall performance and QoS factors
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Multiplexer-related 
