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Random early detection over wireless links

a technology of random detection and wireless links, applied in data switching networks, frequency-division multiplexes, instruments, etc., can solve the problem of two phases of tcp being extremely inefficien

Inactive Publication Date: 2009-09-17
IPR LICENSING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the breaching of buffer levels to trigger Random Early Detection (RED) controlled loss can result in the communications link going into either ‘congestion avoidance’ or ‘slow start’ modes simultaneously.
For wireless systems, these two phases of TCP are extremely inefficient because data is sent in small amounts instead of attempting to fully utilize the capacity of the assigned RF data link.

Method used

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  • Random early detection over wireless links
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Examples

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Embodiment Construction

[0017]A description of preferred embodiments of the invention follows.

[0018]FIG. 2 is a block diagram of the wireless network 50 of FIG. 1, described above, in which an embodiment of the present invention is deployed. In this embodiment, the transceiver logic 165 is coupled to Random Early Detection (RED) logic 160b via a bus 200. Physical layer data 205 flows from the transceiver logic 165 to the RED logic 160b. The RED logic 160b determines whether to trigger random early detection controlled loss in one of the priority based queues 150. If the RED logic 160b determines to trigger the RED controlled loss based on a change in processing gain (due to any number of factors), then it sends a message or command 210 to at least one of the queues 155a-155d.

[0019]In contrast to the prior art configuration in the which the RED logic 160a (FIG. 1) monitors buffer levels of the priority based queues 150, the RED logic 160b of the present invention monitors the transceiver logic 165 or other...

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Abstract

Random early detection (RED) controlled loss (i.e., discarding data packets) is determined as a function of change in processing gain assigned by a resource management system in a data network having a communications link between first and second network nodes. Rather than triggering RED controlled loss as a function of buffer levels, triggering is determined as a function of change in processing gain caused by, for example, a change in code rate, modulation technique, error (e.g., bit error rate or frame error rate), signal-to-noise ratio (SNR) or carrier-to-interference (C / I) level, or a number of traffic code channels or TDMA slots assigned to the nodes. In a wireless data network, this technique may be deployed in a base station or access terminal. A tight coupling between the physical layer and link layer is provided using this technique.

Description

CROSS REFERENCE TO RELATED APPLICATION(S)[0001]This application is a continuation of U.S. patent application Ser. No. 10 / 302,797, filed Nov. 21, 2002, which is incorporated by reference as if fully set forth.BACKGROUND OF THE INVENTION[0002]Random Early Detection (RED) is a buffering technique that allows a controlled level of loss to occur in packet buffers within routers when congestion is perceived. This controlled loss allows flow control processes within the transport control protocol (TCP) to scale back sending of data on a particular link or flow.[0003]Controlled loss may also be performed on real time and near real time streams according to loss profiles that limit degradation to a level acceptable to end users. The controlled loss in an RED implementation is performed on a weighted basis, with flows occupying larger portions of the aggregate traffic flow having a higher probability of loss in the case of congestion.[0004]In RED controlled loss techniques, the deciding facto...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L12/56H04L12/24H04L12/26
CPCH04L47/10H04L47/326H04L47/29H04L47/14H04W28/0231H04W28/0284H04W8/04
Inventor FOORE, LAWRENCE R.JOHNSON, KEVIN P.
Owner IPR LICENSING INC
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