Method for improving a tfci transportation performance, including the steps of (1) coding tfci information bits to be transported through each radio frame, (2) repeating a tfci code word produced by the coding for an arbitrary times, (3) applying puncturing patterns different from each other to the repeated code words produced as many as the repeated times, and puncturing the repeated code words at locations different from each other, and (4) dividing, inserting, and transporting the punctured fixed length repeated code words in each slot of the radio frame, whereby improving tfci information transportation performance, and embodying the receiver side decoder to be identical to a case when a 32 bit code word are transported perfectly.
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13. A method of compressing a transport format combination indicator (tfci), comprising:
repeating a tfci having a first prescribed number of bits for a prescribed number of repetitions to form a tfci repeated code word;
selecting a second prescribed number of bits from at least one of the repeated tfci that form the tfci repeated code word, such that for each selected bit, a corresponding bit in each of the remaining tfci is not selected; and
removing the selected bits from the at least one tfci repeated code words word to form a compressed tfci repeated code word.
1. A method for transmitting a transport format combination indicator(tfci) in a wireless communication system, comprising the steps of:
(1) coding tfci information bits into tfci code word;
(2) repeating said tfci code word for predetermined times to obtain a code word block which comprises tfci repeated code word;
(3) selecting bits from the tfci repeated code word so that the bits to be selected can be dispersed in the code word block which is obtained by repeating the bits of the tfci code word;
(4) puncturing the selected bits from the tfci repeated code word; and,
(5) transmitting the tfci repeated code word from which the selected bits have been punctured over a radio frame.
25. A user equipment (UE) for a mobile communication system, comprising:
means for forming a transport format combination indicator (tfci) having a first prescribed number of bits to be transported through a radio frame;
means for repeating the tfci for a prescribed number of repetitions to form a tfci repeated code word;
means for selecting a second prescribed number of bits from at least one of the repeated tfci that form the tfci repeated code word, such that for each selected bit, a corresponding bit in each of the remaining tfci is not selected;
means for removing the selected bits from the tfci repeated code word to form a punctured tfci repeated code word; and
means for forming the compressed tfci repeated code word into the radio frame to be transported.
2. A method as claimed in
3. A method as claimed in
0. 4. A method as claimed in
0. 5. A method as claimed in
0. 6. A method as claimed in
Pij=[B/Pj+B/(PN)i]+Bi+K, wher [x] represents a greatest integer not greater than x and i=0,1, . . . , N−1, j=1,1, . . . , P−1.
7. A method as claimed in
0. 8. A method as claimed in
9. The method of
0. 10. The method of
Pj=[B/(P·N)·j]+IB+K, where [x] denotes a greatest integer not greater than ‘x’.
11. The method of
12. The method of
14. The method of
15. The method of
16. The method of
17. The method of
18. The method of
19. The method of
20. The method of
21. The method of
22. The method of
24. The method of
26. The UE of
27. The UE of
28. The UE of
29. The method of
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y0, y1, y2, - - - yNB-2, yNB-1 (2).
In this instance, there is a relation between the equation (1) and the equation (2) expressed as an equation, below.
y((m−1)B+i)mod B=xi (3),
In a first embodiment of the present invention, a location at which the repetition occurrs less in the (B, A) code word is fixed according to the following equation (4), which is the simplest embodiment done by puncturing the code words at fixed locations.
P=(j+K)mod B, (j=0, 1, - - - , P·N−1) (4),
Third, when a code word block is formed by a combination of individual code words, locations of bits having repeated for less number of times are made to be distributed uniformly over the entire code word block by means of the puncturing.
Fourth, locations of consecutive puncturing should be far as much as possible.
For meeting the above basic principles, the locations of bits in the (B, A) code word having repeated for less number of times are fixed according to an equation (5), below.
ri=[(B/P(P·N)·i]+K, (i=0, 1, - - - , P·N−1) (5),
Accordingly, the locations of puncturing which meet the above basic principles can be expressed as equations (6), (7), (9), and (10), where Pij denotes a puncturing location, obtained from ypij, denoting a (j)th puncturing position in an (i)th repeated code in the code word block obtained by repeating the bits of the TFCI code words shown in the equation (2), i=0, 1, - - - , N−1, j=0, 1, - - - , P−1, and K is an integer greater than ‘0’.
Pij=[B/P·j+B/(P·N)·i]+B·i+K (6),
If B/P and B/(P·N) in the equation (6) are integers, the equation (6) can be expressed as an equation (7), below.
Pij=B/P·j+B/(P·N)·i+B·i+K (7),
and, when N=2n, an equation (8) below can be obtained.
Pij=B/P·j+B/(P·N)·R(i, n)+B·i+K (8),
And, when P=2P, the following equation (9) can be obtained, where, alike a case of the equation (8), R(j, p) denotes binary ‘j’ bit reversed into decimal T with reference to ‘p’ bit.
Pij=B/P·R(j, p)+B/(P·N)·R(i, n)+B·i+K (9).
Other than those, if expression of ‘N’ or ‘P’ as (n)th power of 2 is impossible, by selecting i, j indices in MIL(Multistage interleaving), the following equation (10) may be used for production of a puncturing pattern.
Pij=B/P·M1(j)+B/(P·N)·M2(i)+B·i+K (10),
A method for improving a TFCI performance transportation in accordance with a third embodiment of the present invention will be explained, taking a case as an example, when the SF is smaller than 128 and a TTI exceeds 10 ms in the first and second embodiments in repeating and transporting bits of the TFCI code word. In this instance, when a repeating number of times according to each TTI is defined by an equation 12, Pij and Pj, a puncturing position for each case when applied to equations 6˜11 with N=nTT, P=2, B=32, K=0, may be fixed. For example, when TTI is 40 ms, the related art repeated pattern is identical to a pattern in
The following equation (12) is an equation for calcualting nTTI defined newly for calulating ‘N’.
nTTI=TTI/10 ms (12),
A fourth embodiment of the present invention will be explained, when the frame trasnport mode is operative in a compressed mode on uplink and downlink. The TFCI code word is defined as an equation (13), and in the compressed mode, the number of bits available in the TFCI fields of one radio frame is defined as D and repeated bits in the TFCI code words are defined as dk.
c0, c1, c c, c3, c4, - - - , cm (where, m=29) (13),
In this instance, an intermediate parameter ‘E’ for obtaining a repeated bits dk in an equation (15) is defined as an equation (14), below.
E=30−1−(Nfirst NTFCI)mod 30 (14),
That is, if a length of the TFCI code word to be transported in a compressed mode is longer than a coded 30bit TFCI code word, the TFCI code word in the compressed mode is produced by repeating bits of the TFCI code word to be inserted in a slot next to slots at which TGL (Transmission Gap Length) of a frame end among the coded 30bit TFCI code word, for minimizing an influence from imperfect power control occurred during the TGL.
In a case D>32 in the present invention, for converting the equation (15) into an equation having a subscript m=32, the parameter ‘E’ in the equation (14) may be defined as ‘L’ as in an equation (16), and the equation (15) can be converted into an equation (17).
L=32−1−(Nfirst NTFCI)mod 32 (16),
When D=31 and D=32, the radio frame transports, not after repeating a portion of bits of the 30bit coded TFCI code word, but the 31bit or 32bit coded TFCI code word as it is.
As has been explained, the method for improving a TFCI transportation performance of the present invention has the following advantatges.
Because the present invention can embody a receiver side decoder identical to a case when a 32bit code word is transmitted perfectly, a receiver side device is not become complicate based on decoding for 16bit or 32bit code word.
Particularly, if the spreading factor is smaller than 128, bits of the code word are repeated, different puncturing patterns are applied to each of the repeated code block unit, even if TTI exceeds 10 ms(i.e., 20 ms, 40 ms, 80 ms), a TFCI information transportation performance is improved, and the receiver side decoder can be embodied identical to a case when a 32 bit code word are transported perfectly.
And, when the radio frame is operative, not in a standard mode, but a compressed mode, in an uplink and a downlink, the TFCI information transportation performance can be improved.
It will be apparent to those skilled in the art that various modifications and variations can be made in the method for improving a TFCI transportation performance of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Kim, Ki Jun, Yun, Young Woo, Kwon, Sung Lark, Hong, Sung Kwon
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