Industrial Technology Research Institute

Tzung-Pao Lin

Yao-Tzung Wang

Ray-Guang Cheng

Chung-Ju Chang

Nen-Fu Huang

Maria C Yuang

Hai-Yang Huang

Hung-Ming Chi

Ming-Chia Hsieh

Jen-Ming Hah

A message scheduler uses two thresholds to place cells into a queue. One determines, for a non-full queue, where to place high-delay-priority cells in relationship to low-delay-priority cells, and the other determines, for a fall queue, which low loss-priority cells to push out to make room for a high-loss-priority cell.

Versatile scheduler for ATM switches

A method and system are disclosed for constructing a power spectrum based connection admission control table and using such a table in a communications network, such as an ATM network. Power spectrum parameters, such as the power spectrum DC component .gamma., half power bandwidth B.sub.w and average power .PSI..sub.w are transformed to .gamma., an equivalent half power bandwidth B.sub.e and an equivalent average power .PSI..sub.e, where B.sub.e is a predetermined constant. Since B.sub.e is constant, the transformation reduces the memory requirements for constructing a connection admission control table.

Power spectrum-based connection admission control for ATM networks

An exclusive VCC is maintained between each two communicating work stations (MT pair). The handoff method differs if the MT moves to a coverage area having a base station connected to the same switch as the previous coverage area (intra-switch mobility) or to a coverage area having a base station connected to a different switch than the previous coverage area (inter-switch mobility). In intra-switch mobility, the switch changes the path directly to the new base station and eliminates the path through the original base station. In inter-switch mobility, the switch performs the path set-up. The path may be elongated from the switch connected to the original BS, to the new BS, rather than from the original BS to the new BS. This eliminates the path through the original base station. The exclusive VCC between the MT pair permits path elongation to be minimized.

Seamless handoff for a wireless lan/wired lan internetworking

A system and process are provided for controlling congestion at a node of an asynchronous transfer mode (ATM) communications network. The process and system utilize fuzzy logic in determining whether or not to 'admit,' i.e., allocate a virtual channel (VC) for, new communications (or calls) to the node. Fuzzy logic is also use to control the rate cells are transmitted to the node for communications already 'admitted,' i.e., for which a VC has already been allocated. The fuzzy logic rules for bandwidth estimation in admission control may be developed from an 'equivalent capacity' model. The fuzzy logic rules for adjusting cell transmission rates may be developed from a 'two-threshold' congestion control model.

Growing community of inventors

Kaohsiung, Taiwan

Tzung-Pao Lin