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1. (EP0983641) A method of and apparatus for detecting and preventing message collisions in a communication system

Office : European Patent Office
Application Number: 98921215 Application Date: 14.05.1998
Publication Number: 0983641 Publication Date: 08.03.2000
Publication Kind : B1
Designated States: AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE
Prior PCT appl.: Application Number:US1998009927 ; Publication Number: Click to see the data
IPC:
H04B 7/005
H04B 7/015
H04L 12/28
H04N 1/00
H04N 1/32
H04N 1/327
H04W 24/00
H04W 28/04
H04W 74/08
[IPC code unknown for H04B 7/05]
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 or CSMA [Carrier Sense Multiple Access]
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 INC
Inventors: LEUNG NIKOLAI K N
Priority Data: 85734397 16.05.1997 US
9809927 14.05.1998 US
Title: (DE) Verfahren und Einrichtung zur Erfassung und Verhinderung von Nachrichtenzusammenstössen in einem Kommunikationssystem
(EN) A method of and apparatus for detecting and preventing message collisions in a communication system
(FR) Procédé et appareil de détection et de prévention des collisions de messages dans un système de communication
Abstract: front page image
(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.
(FR) Dans un système de communication en mode semi-duplex dans lequel des retards supplémentaires sur la voie de communication (18, 20) peuvent provoquer une collision entre un message et une réponse, on met en oeuvre un détecteur de collision (40a, 40b) pour prévenir et détecter les collisions de messages. Ce détecteur de collisions détermine (204) si une réponse peut être émise par le dispositif de communication alors qu'il reçoit le message courant. Si aucune réponse n'est attendue, le détecteur de collision est placé (206) en mode moniteur. Dans ce mode moniteur, le détecteur de collision surveille la voie de communication et détermine (210) si une collision de messages s'est produite au cours de la transmission du message. La détection d'une collision de messages entraîne la répétition du message ou l'émission d'un éventuel nouveau message à un instant ultérieur, après qu'il ait été établi (202) que la voie de communication est libre.
Also published as:
KR1020010012637EP1478101JP2002502563 CN1267408AU1998073878WO/1998/052299