Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
193 words
A method for transmitting packet data in an air interface of digital cellular radio telephone system based on a hybrid forward error correction/automatic repeat request, i.e. FEC/ARQ type II, comprising the following steps for each packet: a) encoding the bits of the packet of user data, header and frame check sequence, using error correcting codes and storing the resulting bits for transmission at the sender side; b) transmitting of a predefined part of the encoded bits that is bigger than the original packet; c) collecting and storing all received data at the receiver side with a storage capacity big enough to store at least the encoded bits of one packet; d) deciding on transmission success at the receiver side, based on the stored data and sending a positive acknowledge (ACK) if the transmission has been decided to be successful and a negative acknowledgement (NAK) if not; e) checking at the sender side of the positive or negative acknowledgement (ACK or NAK) and going to step b) in case of negative acknowledge (NAK) otherwise in case of positive acknowledgement (ACK) the transmitting of the packet is being completed and the receiver storage is cleared.
Claim 2
Dependent Claim
39 words
The method for transmitting packet data as claimed in claim 1, characterized in that the size of Air-Interface-Units is constant and can be carried by an undivided number of TDMA bursts, i.e. 456 bit, as in 4 GSM bursts.
Claim 3
Dependent Claim
37 words
The method for transmitting packet data as claimed in claim 1, characterized in that a convolutional coder with coding rate 1/2 is used for encoding the bits of the packet of user data at the sender side.
Claim 4
Dependent Claim
36 words
The method for transmitting packet data as claimed in claim 1. characterized in that the predefined part of the encoded data that is transmitted on a Air-Interface-Unit is predetermined i.e. by the number of this Air-Interface-Unit.
Claim 5
Dependent Claim
45 words
The method for transmitting packet data as claimed in claim 1. characterized in that in case of soft decision decoding the receiver side will store additionally the log-likelihood-values of each bit L = -1n (p/(1-p)) where p is the estimated error probability for each bit.
Claim 6
Dependent Claim
32 words
The method for transmitting packet data as claimed in claim 1, characterized in that in the case the immediate decision on successful transmission is not possible in time the success is predicted.
Claim 7
Dependent Claim
32 words
The method for transmitting packet data as claimed in claim 1, characterized in that in the case that no acknowledgement is received at the sender side a negative acknowledge (NAK) is assumed.
Claim 8
Dependent Claim
46 words
The method for transmitting packet data as claimed in claim 6, characterized in that in the case that no prediction is possible in time the channel has to be devided into subchannels in the way that the transmission of different packets is altered in consecutive Air-Interface-Units.
Claim 9
Dependent Claim
31 words
The method for transmitting packet data as claimed in claim 6, characterized in that the prediction is based on the stored data including loglikelihood-values and the number of not successful receptions.