Velocity matching method for limited longness circulation caching of Turbo code

The present invention discloses a method for rate matching the length of one kind of Turbo codes finite circular buffer, comprising the steps of: inputting information data bits Turbo coded blocks, and determining a one-dimensional finite length of the cyclic buffer size based on the encoding result; previously defined each redundancy version value specified start position of hybrid automatic repeat request packet uniformly or approximately uniformly distributed in a circular buffer dimensional finite length; and hybrid automatic repeat request number, redundancy version taken from each a value selected redundancy version value, and assign a redundancy version selected from a value of hybrid automatic repeat request packet start position to start reading data of a specific sequence length bits hybrid automatic retransmission request packet and the hybrid automatic repeat request packet sent. By the present invention, it is possible to reduce the size of the circular buffer, to improve the performance of the hybrid retransmission HARQ packet.