Method and apparatus for determining rate matching parameters for a transport channel in a mobile telecommunication system

• US 20050249163A1
• Filed: 05/04/2005
• Published: 11/10/2005
• Est. Priority Date: 05/06/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Heo, Youn-Hyoung, Kim, Young-Bum, Kwak, Yong-Jun, Cho, Joon-Young, Lee, Ju-Ho
• Application Number:
  US11/121,002
• Publication Number:
  US 20050249163A1
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/1803 Stop-and-wait protocols
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining

Abstract

Disclosed are a method and an apparatus for determining rate matching parameters for transport channels in mobile telecommunication system. The apparatus and method include determining first physical channel bit sizes usable in transmitting at least one first transport channel not supporting hybrid automatic repeat request (HARQ) and at least one second transport channel supporting the hybrid automatic repeat request, determining if there is at least one second physical channel bit size in the first physical channel bit sizes, the second physical channel bit size allowing transmission for a size of coded bits corresponding to the first transport channel and a size of coded bits corresponding to the second transport channel based on rate matching and puncturing, reducing the size of the coded bits corresponding to the second transport channel when the second physical channel bit size is not included in the first physical channel bit sizes, returning to the step of determining if there is at least one second physical channel bit size after the size of the coded bits corresponding to the second transport channel is reduced, and when there is at least one second physical channel bit size, selecting one second physical channel size based on at least one second physical channel bit size as a rate matching parameter for the first transport channel and the second transport channel.

Claims

1. A method for determining rate matching parameters for transport channels in a mobile telecommunication system, the method comprising the steps of:

determining first physical channel bit sizes usable in transmitting at least one first transport channel not supporting hybrid automatic repeat request (HARQ) and at least one second transport channel supporting the hybrid automatic repeat request;

determining if there is at least one second physical channel bit size in the first physical channel bit sizes, the second physical channel bit size allowing transmission for a size of coded bits corresponding to the first transport channel and a size of coded bits corresponding to the second transport channel in consideration of rate matching and puncturing;

reducing the size of the coded bits corresponding to the second transport channel when the second physical channel bit size is not included in the first physical channel bit sizes;

returning to the step of determining if there is at least one second physical channel bit size after the size of the coded bits corresponding to the second transport channel is reduced; and

when there is at least one second physical channel bit size, selecting one second physical channel size based on at least one second physical channel bit size as a rate matching parameter for the first transport channel and the second transport channel.

2. The method as claimed in claim 1, wherein the step of determining if there is at least one second physical channel bit size comprises:

determining if there is at least one third physical channel bit size, the third physical channel bit size enabling rate matching while preventing puncturing with respect to the sizes of the coded bits corresponding to the first transport channel and the second transport channel;

when there is no third physical channel bit size, determining if there is at least one fourth physical channel bit size comprising a size of bits corresponding to the rate-matched first transport channel and the rate-matched second transport channel within preset puncturing limits ; and

when there is at least one fourth physical channel bit size, regarding at least one fourth physical channel bit size as at least second physical channel bit size.

3. The method as claimed in claim 2, further comprising:

when there is at least one third physical channel bit size, determining if a minimum value based on at least one third physical channel bit size requires only one physical channel;

when only one physical channel is required for the minimum value, selecting the minimum value as a rate matching parameter for the first transport channel and the second transport channel;

when a minimum value based on at least one fourth physical channel bit size requires at least two physical channels, determining if there is at least one fourth physical channel bit size including a size of bits corresponding to the rate-matched first transport channel and the rate-matched second transport channel within preset puncturing limit; and

when there is at least one fourth physical channel bit size, regarding at least one fourth physical channel bit size as at least second physical channel bit size.

4. The method as claimed in claim 2, wherein the step of determining if there is at least one third physical channel bit size comprises a step of determining if there are values of N_datas satisfying an equation,

$(\underset{1\le }{\min }$

y ≤

I ⁢

{ RM y } ) ×

N data - ∑

x = 1 I ⁢

( RM x ×

N x , j ) ≥

0 ,

wherein the RM_y and the RM_x, denote rate matching weight for a y^th transport channel and an x^th transport channel, respectively, the I denotes a total number of the transport channels, and the N_x,j denotes a size of coded bits corresponding to an x^th transport channel having j^th transport format combination.

5. The method as claimed in claim 2, wherein the step of determining if there is at least one fourth physical channel bit size comprises a step of determining if there are values of N_datas satisfying an equation,

$(\underset{1\le }{\min }$

y ≤

I ⁢

{ RM y } ) ×

N data - ∑

x = 1 I ⁢

( RM x ×

N x , j ) ≥

0 ,

wherein the RM_y and the RM_x, denote rate matching weight for a y^th transport channel and an x^th transport channel, respectively, the I denotes a total number of the transport channels, the N_x,j denotes a size of coded bits corresponding to an x^th transport channel having j^th transport format combination (TFC), and the PL denotes preset puncturing limit.

6. The method as claimed in claim 1, wherein, in the step of selecting one size based on at least one second physical channel bit size, a maximum value, which does not require additional physical channels, based on at least one second physical channel bit size is selected as the rate matching parameter.

7. The method as claimed in claim 1, wherein, in the step of reducing the size of the coded bits corresponding to the second transport channel, the size of the coded bits is reduced at a preset ratio.

8. The method as claimed in claim 1, wherein, in the step of reducing the size of the coded bits corresponding to the second transport channel, the size of the coded bits is reduced by a size of preset bits.

9. The method as claimed in claim 7, wherein the size of the coded bits corresponding to the second transport channel is reduced within a preset update limitative ratio.

10. The method as claimed in claim 8, wherein the size of the coded bits corresponding to the second transport channel is reduced within a preset update limitative ratio.

11. The method as claimed in claim 1, further comprising:

by using the size of the physical channel bits selected as the rate matching parameter, calculating an amount of bits to be punctured or repeated in each frame of the transport channels through an equation,

$\mathrm{\Delta <br><br>}<br><br>\text{\hspace{1em}<br><br>}<br><br>N_{i,j}=Z_{i,j}-Z_{i-1,j}-N_{i,j},\mathrm{for}<br><br>\text{\hspace{1em}<br><br>}<br><br>\mathrm{all}<br><br>\text{\hspace{1em}<br><br>}<br><br>i=1,\mathrm{\dots <br><br>}<br><br>\text{\hspace{1em}<br><br>}<br><br>I$$Z_{0,j}=0$$Z_{i,j}=\lfloor <br><br>\frac{\left(\underset{m=1}{\overset{i}{\sum <br><br>}}<br><br>\left({\mathrm{RM}}_m\times <br><br>N_{m,j}\right)\times <br><br>N_{\mathrm{data},j}\right)}{\underset{m=1}{\overset{I}{\sum <br><br>}}<br><br>\left({\mathrm{RM}}_m\times <br><br>N_{m,j}\right)}\rfloor <br><br>,\mathrm{for}<br><br>\text{\hspace{1em}<br><br>}<br><br>i=1,\mathrm{\dots <br><br>}<br><br>\text{\hspace{1em}<br><br>}<br><br>I$

wherein the Δ

N_i,j denotes the amount of the bits to be punctured or repeated in each frame of an i^th transport channel having j^th transport format combination (TFC), the N_m,j denotes a size of coded bits corresponding to an m^th transport channel having the j^th transport format combination, the N_data,j denotes the selected size of the physical channel bits, and the RM_m denotes preset rate matching weight of the m^th transport channel, and the I denotes a total number of the transport channels; and

determining a rate matching pattern representing positions of the bits to be punctured or repeated according to the calculated amount of the bits.

12. An apparatus for determining rate matching parameters for transport channels in a mobile telecommunication system, the apparatus comprising:

a rate matching parameter determination unit for reducing a size of coded bits corresponding to a second transport channel until there is at least one second physical channel bit size in first physical channel sizes, wherein the first physical channel bit sizes are available for transmitting at least one first transport channel and at least one second transport channel, the first transport channel not supporting hybrid automatic repeat request (HARQ) and the second transport channel supporting the hybrid automatic repeat request, the second physical channel bit size allowing transmission for a size of coded bits corresponding to the first transport channel and the size of the coded bits corresponding to the second transport channel in consideration of rate matching and puncturing, and selecting one second physical bit size based on at least one second physical channel bit size as a rate matching parameter for the first transport channel and the second transport channel when there is at least one second physical channel bit size; and

a device for performing rate matching or rate de-matching by using the rate matching parameter.

13. The apparatus as claimed in claim 12, wherein the rate matching parameter determination unit determines if there is at least one third physical channel bit size, the third physical channel bit size enabling rate matching while preventing puncturing with respect to the sizes of the coded bits corresponding to the first transport channel and the second transport channel, determines if there is at least one fourth physical channel bit size including a size of bits corresponding to the rate-matched first transport channel and the rate-matched second transport channel within preset puncturing limit when there is no third physical channel bit size, and regards at least one fourth physical channel bit size as at least second physical channel bit size when there is at least one fourth physical channel bit size.

14. The apparatus as claimed in claim 13, wherein the rate matching parameter determination unit determinates if a minimum value based on at least one third physical channel bit size requires only one physical channel when there is at least one third physical channel bit size, selects the minimum value as a rate matching parameter for the first transport channel and the second transport channel when the minimum value requires only one physical channel, determines if there is at least one fourth physical channel bit size including a size of bits corresponding to the rate-matched first transport channel and the rate-matched second transport channel within preset puncturing limit when at least two physical channels are required for a minimum value based on at least one fourth physical channel bit size, and regards at least one fourth physical channel bit size as at least second physical channel bit size when there is at least one fourth physical channel bit size.

15. The apparatus as claimed in claim 13, wherein the rate matching parameter determination unit determines that values of N_datas satisfying an equation,

$(\underset{1\le }{\min }$

y ≤

I ⁢

{ RM y } ) ×

N data - ∑

x = 1 I ⁢

( RM x ×

N x , j ) ≥

0 ,

include at least one third physical channel bit size, wherein the RM_y and the RM_x denote rate matching weight for a y^th transport channel and an x^th transport channel, respectively, the I denotes a total number of the transport channels, and the N_x,j denotes a size of coded bits corresponding to an x^th transport channel having j^th transport format combination.

16. The apparatus as claimed in claim 13, wherein the rate matching parameter determination unit determines that values of N_datas satisfying an equation,

$(\underset{1\le }{\min }$

y ≤

I ⁢

{ RM y } ) ×

N data - ∑

x = 1 I ⁢

( RM x ×

N x , j ) ≥

0 ,

include at least one fourth physical channel bit size, wherein the RM_y and the RM_x denote rate matching weight for a y^th transport channel and an x^th transport channel, respectively, the I denotes a total number of the transport channels, the N_x,j denotes a size of coded bits corresponding to an x_th transport channel having j^th transport format combination (TFC), and the PL denotes preset puncturing limit.

17. The apparatus as claimed in claim 12, wherein the rate matching parameter determination unit selects a maximum value, which does not require additional physical channels, based on at least one second physical channel bit size as the rate matching parameter.

18. The apparatus as claimed in claim 12, wherein the rate matching parameter determination unit reduces the size of the coded bits corresponding to the second transport channel at a preset ratio.

19. The apparatus as claimed in claim 12, wherein the rate matching parameter determination unit reduces the size of the coded bits corresponding to the second transport channel by a size of preset bits.

20. The apparatus as claimed in claim 18, wherein the rate matching parameter determination unit reduces the size of the coded bits corresponding to the second transport channel within a preset update limitative ratio.

21. The apparatus as claimed in claim 19, wherein the rate matching parameter determination unit reduces the size of the coded bits corresponding to the second transport channel within a preset update limitative ratio.

22. The apparatus as claimed in claim 12, wherein the rate matching parameter determination unit calculates an amount of bits to be punctured or repeated in each frame of the transport channels through an equation,

$\begin{array}{c}\Delta \end{array}$

⁢

 

⁢

N i , j = Z i , j - Z i - 1 , j - N i , j ,  

⁢

for ⁢

 

⁢

all ⁢

 

⁢

i = 1 , …

⁢

 

⁢

I Z 0 , j = 0 Z i , j = ⌊

( ∑

m = 1 i ⁢

 

⁢

( RM m ×

N m , j ) ×

N data , j ) ∑

m = 1 I ⁢

 

⁢

( RM m ×

N m , j ) ⌋

⁢

 

⁢

for ⁢

 

⁢

i = 1 , …

⁢

 

⁢

I , ⁢

 

physical channel bits selected as the rate matching parameter, wherein the Δ

N_i,j denotes the amount of the bits to be punctured or repeated in each frame of an i^th transport channel having j^th transport format combination (TFC), the N_m,j denotes a size of coded bits corresponding to an m^th transport channel having the j^th transport format combination, the N_data,j denotes the selected size of the physical channel bits, and the RM_m denotes preset rate matching weight of the m^th transport channel, and the I denotes a total number of the transport channels and determines a rate matching pattern representing positions of the bits to be punctured or repeated according to the calculated amount of the bits.

23. A method for data transmission in a mobile communication system, the method comprising the steps of:

on a first transport channel not supporting hybrid automatic repeat request (HARQ) channel coding data of the first transport channel;

rate matching the coded data of the first transport channel;

on a second transport channel supporting HARQ channel coding data of the second transport channel;

rate matching the coded data of the second transport channel;

multiplexing the rate matched data of the first transport channel and the rate matched data of the second transport channel;

mapping the multiplexed data to physical channel data; and

transmitting the physical channel data wherein if there is no code channel set having a sufficient physical channel bit size to transmit the first transport channel and the second transport channel, and down sizing the data of the second transport channel.

24. The method of claim 23, wherein the code channel set represents combinations of spreading factors and physical channel bit sizes.

25. The method of claim 23, wherein the data of the second transport channel is down sized according to one of determined step size or step ratio.

26. A apparatus for data transmission in a mobile communication system, the apparatus comprising:

on a first transport channel not supporting hybrid automatic repeat request (HARQ) a first channel coder for channel coding data of the first transport channel;

a first rate matcher for rate matching the coded data of first transport channel;

on a second transport channel supporting HARQ a second channel coder for channel coding of the second transport channel;

a second channel coder for rate matching the coded data of second transport channel;

a multiplexer for multiplexing the rate matched data of the first transport channel and the rate matched data of the second transport channel;

a physical channel mapper for mapping the multiplexed data to physical channel data; and

a transmitter for transmitting the physical channel data wherein if there is no code channel set having a sufficient physical channel bit size to transmit the first transport channel and the second transport channel, and down sizing the data of the second transport channel.

27. The apparatus of claim 26, wherein the code channel set represents combinations of spreading factors and physical channel bit sizes.

28. The apparatus of claim 26, wherein the data of the second transport channel is down sized according to one of determined step size or step ratio.

29. A method for receiving data in a mobile communication system, the method comprising the steps of:

receiving RF signal, and down converting the RF signal to base band signal;

de-multiplexing the base band signal to each code channel;

de-multiplexing said code channel data to a first transport channel not supporting hybrid automatic repeat request (HARQ) and a second transport channel supporting HARQ;

on the first transport channel de-rate matching the de-multiplexed data of the first transport channel;

channel decoding the de-rate matched data of first transport channel;

on the second transport channel supporting HARQ, the data of the second transport channel being able to be down-sized, if there is no code channel set having a sufficient physical channel bit size to transmit the first transport channel and the second transport channel, de-rate matching the de-multiplexed data of the second transport channel;

channel decoding the de-rate matched data of the second transport channel;

wherein if the second transport channel is retransmitted, and the de-rate matched data of the second transport channel is combined previous transmitted data of second transport channel.

30. The method of claim 29, wherein the code channel set represents combinations of spreading factors and physical channel bit sizes.

31. The method of claim 29, wherein the data of the second transport channel is down sized according to one of determined step size or step ratio.

32. A apparatus for receiving data in a mobile communication system, the apparatus comprising:

a receiver for receiving RF signal, and down converting the RF signal to base band signal;

a de-multiplexer for de-multiplexing the base band signal to each code channel;

a transport channel de-multiplexer for de-multiplexing said code channel data to a first transport channel not supporting hybrid automatic repeat request (HARQ) and a second transport channel supporting HARQ;

on the first transport channel a first de-rate matcher for de-rate matching the de-multiplexed data of the first transport channel;

a first channel decoder for channel decoding the de-rate matched data of first transport channel;

on the second transport channel supporting HARQ, the data of the second transport channel being able to be down-sized, if there is no code channel set having a sufficient physical channel bit size to transmit the first transport channel and the second transport channel, a second de-rate matcher for de-rate matching the de-multiplexed data of the second transport channel;

a buffer for buffering the de-rate matched data of the second transport channel, a second channel decoder for channel decoding the de-rate matched data of the second transport channel; and

wherein if the second transport channel is retransmitted, and the de-rate matched data of the second transport channel is combined previous transmitted data of second transport channel being in the buffer.

33. The apparatus of claim 32, wherein the code channel set represents combinations of spreading factors and physical channel bit sizes.

34. The apparatus of claim 32, wherein the data of the second transport channel is down sized according to one of determined step size or step ratio.