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Multichannel ring and star networks with limited channel conversion
| Details |
Inventors: Ramaswami, Rajiv; Sasaki, Galen;
Assignee: Tellabs Operations, Inc. (Lisle, IL)
Primary Examiner: Hsu; Alpus H.
Assistant Examiner:
Attorney, Agent or Firm: McAndrews, Held & Malloy, Ltd.
A ring communication network including N nodes and comprising links between the nodes for carrying data in W channels. The network is configured by providing nodes and channels such that N.gtoreq.2 log.sub.2 W-1 where W is a power of 2. No more than W channels are assigned to the transmission of data along any of the links. The nodes are configured such that each channel of a first one of the links adjacent any one of the nodes can be switched to no more than W-1 channels of a second one of the links adjacent any one node. |
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DETAILED DESCRIPTION The invention proposes configurations of ring and star networks with limited channel conversion to efficiently support connections.
In addition, algorithms are provided to efficiently assign channels to connections.
More specifically, it is an object of this invention to provide a cost effective network by using nodes with limited switching capability.
It is also an object of this invention to efficiently assign channels to links of a network with nodes having limited switching capabilities so as to maximize network resources.
More generally, it is the overall object of this invention to configure a network and assign channels to the network in a cost effective manner.
The invention achieves the following results: In a ring network with N nodes, the invention proposes a network configuration and for this configuration, proposes a channel assignment method for any request with load .
lambda.
.
sub.
max that uses .
lambda.
.
sub.
max channels with channel degree at most k=2 at each node provided N.
gtoreq.
2 log.
sub.
2 .
lambda.
.
sub.
max -1 and W is a power of two.
.
lambda.
.
sub.
max channels with channel degree at most .
DELTA.
+1 at each node, where .
DELTA.
>1, provided N.
gtoreq.
log.
sub.
.
DELTA.
.
lambda.
.
sub.
max.
In a star network, the invention proposes a configuration and for this configuration, proposes a channel assignment method for any request with load .
lambda.
.
sub.
max that uses .
lambda.
.
sub.
max channels with fixed conversion.
In a network with an arbitrary topology the invention proposes a configuration and for this configuration, proposes a channel assignment method for any request with load .
lambda.
.
sub.
max where no connection is more than 2 hops, that uses .
lambda.
.
sub.
max channels with fixed conversion.
Accordingly, this invention provides for a method of configuring nodes in a ring communications network wherein one of the nodes of ring is designated as a primary node, which is configured to have full channel conversion.
That is, any two channels between its two incident links can be connected to each other
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