Method of forming a coded composite transport channel for downlink transmissions

A method of storing radio frames of N transport channels (TrCHs) to form a coded composite transport channel (CCTrCH) for downlink transmissions, comprising:

• for each radio frame of a TrCH, until a complete TrCH has been stored:
• generating a first count of a number of p-bits in each radio frame, the p-bits representing bits created due to puncturing of the radio frame, and
• generating a second count of a total number of data bits in each radio frame before a known insertion point for insertion of discontinued transmission (DTX) bits is reached;
• setting an initial count of said second count to equal the corresponding first count for each radio frame;
• determining a minimum second count value from the initial second counts;
• writing binary values of data bits of a radio frame corresponding to the determined minimum count value to the memory;
• incrementing the second counter having the minimum second count value;
• and
• repeating the determining, writing and incrementing until a complete TrCH has been stored.

A method of forming a coded composite transport channel (CCTrCH) for downlink transmissions from a plurality of stored transport channels (TrCHs), each TrCH comprising a plurality of radio frames, comprising:

• for each radio frame of each stored TrCH:
• reading out stored binary values of data bits on a frame-by-frame basis, the binary values of data bits stored as one-bit symbols;
• converting said read out binary values stored as one-bit symbols to two 2-bit symbols;
• inserting a third 2-bit DTX symbol into each read out radio frame that is not completely filled by said read-out binary values of data bits;
• and
• multiplexing the plurality of radio frames to form a CCTrCH for transmission in the downlink.

A method of inserting data bits in a memory of an interleaver, comprising:

• for each data bit of each radio frame of a transport channel (TrCH), until a complete TrCH has been stored:
• setting a number of p-bits in each radio frame as a first count value for each radio frame;
• counting data bits in each radio frame to set a second count value for each radio frame;
• storing each first count value of p-bits for each radio frame in a corresponding space in a first register;
• storing each second count value of data bits for each radio frame in a corresponding space in a second register;
• determining a first minimum count value from the stored first and second count values in the first and second register;
• inserting a data bit in a space in the memory corresponding to the register having the lowest count value;
• and
• incrementing the register.