Retransmission ordering method, wireless communication system, receiver and transmitter
First Claim
1. A retransmission ordering method in a receiver for receiving transmission data by wireless, frame data being encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into the transmission data, the retransmission ordering method comprising the steps of:
- receiving transmission data;
storing received transmission data in a buffer;
decoding the transmission data stored in the buffer in accordance with the inner code and outputting a decode result and likelihood information thereof;
creating frame data by combining decoded blocks;
decoding the frame data in accordance with the outer code;
determining whether or not to perform a retransmission order in units of blocks based on the likelihood information; and
transmitting a retransmission order for an applicable block if it is determined that a retransmission is necessary according to the step of determining whether or not to perform a retransmission order, wherein at the step of determining whether or not to perform a retransmission order, the retransmission order for the block is inhibited if the number of inner-code errors in a frame consisting of the predetermined number of blocks stays within a limit of what the outer code can correct and it is determined that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit.
4 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a wireless communication system wherein frame data is encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into transmission data which a receiver receives by wireless In the receiver, a decoder decodes the received transmission data in accordance with the inner code, a retransmission order determining unit determines whether or not to perform a retransmission order in units of blocks based on the likelihood information (decoded soft-decision value). At this time, the retransmission order determining unit inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of predetermined number of blocks stays within a limit of what the outer code can correct at a decoder and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit. An average value of absolute values of the likelihood information within a block, for example, can be used as an evaluation value.
-
Citations
20 Claims
-
1. A retransmission ordering method in a receiver for receiving transmission data by wireless, frame data being encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into the transmission data, the retransmission ordering method comprising the steps of:
-
receiving transmission data;
storing received transmission data in a buffer;
decoding the transmission data stored in the buffer in accordance with the inner code and outputting a decode result and likelihood information thereof;
creating frame data by combining decoded blocks;
decoding the frame data in accordance with the outer code;
determining whether or not to perform a retransmission order in units of blocks based on the likelihood information; and
transmitting a retransmission order for an applicable block if it is determined that a retransmission is necessary according to the step of determining whether or not to perform a retransmission order, wherein at the step of determining whether or not to perform a retransmission order, the retransmission order for the block is inhibited if the number of inner-code errors in a frame consisting of the predetermined number of blocks stays within a limit of what the outer code can correct and it is determined that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A wireless communication system comprising a transmitter and a receiver,
wherein after encoding frame data with an outer code, the transmitter divides the frame data into predetermined number of blocks which are further encoded with an inner code, and the transmitter transmits the encoded data to the receiver by wireless; - and
wherein the receiver receives transmitted data, stores received data in a buffer, decodes transmission data stored in the buffer in accordance with the inner code, creates frame data by combining decoded blocks, decodes the frame data in accordance with the outer code, outputs a decode result and likelihood information thereof, determines whether or not to perform a retransmission order in units of blocks based on the likelihood information, and transmits a retransmission order for an applicable block if it is determined that a retransmission is necessary based on the determining whether or not to perform a retransmission order, and in the case of determining whether or not to perform a retransmission order, the receiver inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of the predetermined number of blocks stays within a limit of what the outer code can correct and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit.
- and
-
10. A receiver for receiving transmission data by wireless, frame data being encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into the transmission data, the receiver comprising:
-
a buffer for storing received transmission data;
first decoding means for decoding the transmission data stored in the buffer in accordance with the inner code and outputting a decode result and likelihood information thereof;
frame combining means for creating frame data by combining decoded blocks;
second decoding means for decoding the frame data in accordance with the outer code;
retransmission order determining means for determining whether or not to perform a retransmission order in units of blocks based on the likelihood information from the first decoding means; and
retransmission order transmitting means for transmitting a retransmission order for an applicable block if the retransmission order determining means determines that a retransmission is necessary, wherein the retransmission order determining means inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of the predetermined number of blocks stays within a limit of what the outer code can correct at the second decoding means and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A transmitter comprising:
-
first encoding means for encoding frame data to be transmitted with an outer code;
frame dividing means for dividing output of the first encoding means into predetermined number of blocks;
a first retransmission buffer for storing output of the frame dividing means;
second encoding means for further encoding frame data in the first retransmission buffer with an inner code;
modulating means for modulating output of the second encoding means;
transmitting means for transmitting a modulated signal; and
retransmission controlling means for making the first retransmission buffer retransmit block data stored in the first retransmission buffer according to a signal received from outside. - View Dependent Claims (19, 20)
-
Specification