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1. (AU1998073878) A method of and apparatus for detecting and preventing message collisions in a communication system

Office : Australia
Application Number: 73878/98 Application Date: 14.05.1998
Publication Number: 1998073878 Publication Date: 28.01.1999
Publication Kind : A
Prior PCT appl.: Application Number:US1998009927 ; Publication Number: Click to see the data
IPC:
H04B 7/015
H04L 12/28
H04N 1/00
H04N 1/32
H04N 1/327
H04W 24/00
H04W 28/04
H04W 74/08
H04B 7/005
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
7
Radio transmission systems, i.e. using radiation field
015
Reducing echo effects
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12
Data switching networks
28
characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
32
Circuits or arrangements for control or supervision between transmitter and receiver
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
1
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
32
Circuits or arrangements for control or supervision between transmitter and receiver
327
Initiating, continuing or ending a single-mode communication; Handshaking therefor
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
24
Supervisory, monitoring or testing arrangements
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
28
Network traffic or resource management
02
Traffic management, e.g. flow control or congestion control
04
Error control
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
W
WIRELESS COMMUNICATION NETWORKS
74
Wireless channel access, e.g. scheduled or random access
08
Non-scheduled access, e.g. random access, ALOHA orĀ CSMA [Carrier Sense Multiple Access]
[IPC code unknown for H04B 7/05]
CPC:
H04N 1/32619
H04B 7/015
H04L 1/1887
H04N 1/00281
H04N 1/32614
H04N 1/32641
H04N 1/32646
H04N 1/32683
H04N 1/327
H04N 2201/0015
H04W 24/00
H04W 74/0816
H04W 74/0825
Applicants: Qualcomm Incorporated
Inventors: Leung, Nikolai K. N.
Priority Data: 08857343 16.05.1997 US
Title: (EN) A method of and apparatus for detecting and preventing message collisions in a communication system
Abstract:
(EN) In a half-duplex communication system in which additional delays in the communication channel (18, 20) may cause a message collision between a message and a response, a collision detector (40a, 40b) is utilized to prevent and detect message collisions. The collision detector determines (204) if a response may be transmitted from the communication device while it is receiving the current message. If no response is expected, the collision detector is placed (214) into a train mode. If a response is possible, the collision detector is placed (206) into the monitor mode. In the monitor mode, the collision detector monitors the communication channel and determines (210) if a message collision has occurred during transmission of the message. A detection of a message collision causes retransmission of the message or possibly a new message at a later time after it has been determined (202) that the communication channel is clear.
Also published as:
KR1020010012637EP0983641EP1478101JP2002502563 CN1267408WO/1998/052299