Method of data communication
DCFirst Claim
1. In a data communication system wherein messages comprising data code words are to be transmitted from a data transmitter to one or more of a plurality of data receivers, a method of transmission of such messages comprising the steps of:
- segmenting the data code words of each message into a sequence of successive segments each of a predetermined length;
assigning an identification number to each message and assigning sequential identification numbers to the successive segments thereof;
including in the first segment of each message a code word which contains the message identification number and including in the last segment of each message a code word identifying it as the last segment, whereby segments having segment identification numbers between those of the first and last segments of a message are identified as being segments of such message; and
including in each segment of a message a code word which includes the segment identification number and also indicates whether such segment includes retransmissions of code words which were included in a previously transmitted segment of the same message.
1 Assignment
Litigations
0 Petitions
Reexamination
Accused Products
Abstract
A method of data communication, particularly for long data messages, is disclosed. The data code words of a message are arranged in segments, each with its own header, and are assigned message and segment identification. A receiver reconstructs the data message segment by segment and, in the non-group call situation, transmits an acknowledgement after the receipt of a segment. The receiver comprises a resettable timer which is set on the receipt of an acceptable segment and runs for a pre-determined duration. If another segment is received within the duration of the timer and has the same identification as the acceptable segment, then it is treated as a retransmission. Efficiency of the data communication method can be increased by retransmitted data code words being included with new data code words in a segment rather than being transmitted in a separate segment requiring its own header. Optionally, an efficient form of bit interleaving may be used.
157 Citations
10 Claims
-
1. In a data communication system wherein messages comprising data code words are to be transmitted from a data transmitter to one or more of a plurality of data receivers, a method of transmission of such messages comprising the steps of:
-
segmenting the data code words of each message into a sequence of successive segments each of a predetermined length; assigning an identification number to each message and assigning sequential identification numbers to the successive segments thereof; including in the first segment of each message a code word which contains the message identification number and including in the last segment of each message a code word identifying it as the last segment, whereby segments having segment identification numbers between those of the first and last segments of a message are identified as being segments of such message; and including in each segment of a message a code word which includes the segment identification number and also indicates whether such segment includes retransmissions of code words which were included in a previously transmitted segment of the same message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification