31-10-2013 дата публикации
Номер: US20130286981A1
Принадлежит:
A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code be simply generated. 1. A method for transmitting control information , the method comprising:transmitting a control format indicator about a number of orthogonal frequency division multiplexing (OFDM) symbols occupied by the control information, wherein the control format indicator is transmitted in a subframe using a prescribed code,wherein the prescribed code is according to the control format indicator and is one of:(0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1),(1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0), or(1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1).2. The method according to claim 1 , further comprising modulating the prescribed code into quadrature phase shift keying (QPSK) symbols.3. The method according to claim 1 , wherein the control format indicator about the number of OFDM symbols occupied by the control information is transmitted via a physical control format indicator channel (PCFICH).4. The method according to claim 1 , wherein the prescribed code is:(0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1) when the number of OFDM symbols occupied by the control information is 1,(1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0) when the number of OFDM symbols occupied by the control information is 2, and(1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1) when the number of OFDM symbols occupied by the control information is 3.5. A method for receiving control information via a downlink at a User Equipment (UE) claim 1 , ...
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