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Scrambling code selection method and scrambling device

A technology of scrambling sequences and coding blocks, which is applied in the field of scrambling code selection methods and scrambling devices, can solve the problems of ACK/NACK message scrambling loss, UE can no longer be distinguished, etc., and achieve the effect of improving reliability

Active Publication Date: 2011-01-05
NANTONG HUAXIN CENT AIR CONDITIONER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the table that the first two of the scrambling code sequence with the index Index1 (i=0, or i=1) and the scrambling code sequence with the index Index2 (correspondingly, i=2, or i=4) The scrambling code bits are the same. If only the previous one or two scrambling code bits are used for scrambling, the scrambling result is exactly the same. The effect of / NACK message scrambling is completely lost

Method used

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  • Scrambling code selection method and scrambling device
  • Scrambling code selection method and scrambling device
  • Scrambling code selection method and scrambling device

Examples

Experimental program
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example 1

[0091] Take the first data transmission as an example, O=1, Q m =4, it can be calculated by formula (1), the number of modulation symbols corresponding to ACK / NACK after encoding is Q′=1, and the length of the scrambling code sequence used is 2.

[0092] According to the scrambling sequence selection method of the embodiment of the present invention, it is assumed that but

[0093] If the UE does not detect any downlink assignment loss, then N bundled =1, scrambling code index i=(N bundled -1) mod 4 = 0; otherwise, N bundled =1+1=2 or N bundled =1+3=4, then the index i=(2-1) mod 4=1, or i=(4-1) mod 4=3, as can be seen from Table 5, since the length used in the two cases is The scrambling code sequences of 2 are orthogonal to each other, so the ACK / NACK after scrambling also feeds back the information of whether the UE has detected the loss of downlink assignment, which achieves the purpose of scrambling.

example 2

[0095] Take the first data transmission as an example, O=1, Q m =4, it can be calculated by formula (1), the number of modulation symbols corresponding to ACK / NACK after coding is Q′=3, and the scrambling code length used is 6.

[0096] According to the method provided by the embodiment of the present invention, if the UE does not detect any loss of downlink assignment, the scrambling code index is 0; otherwise, the scrambling code index is 1 (or 3), and the co-correlation value of the two scrambling code sequences is 0 , the sub-correlation value is 6, but if the existing technical solution is adopted, the co-correlation value of the two scrambling code sequences is 2, and the sub-correlation value is 6. It can be seen from the comparison that the method provided by the embodiment of the present invention improves the scrambling Scrambling performance when the code length is 4n+2.

example 3

[0098] Take the first data transmission as an example, O=2, Q m =4, it can be calculated by formula (1), the number of modulation symbols corresponding to the ACK / NACK message after coding is Q′=2, then The length of the scrambling code sequence used is 2, The length of the scrambling code sequence used is one.

[0099] According to the scrambling sequence or scrambling code selection method of the embodiment of the present invention, if the UE does not detect any downlink assignment loss, the scrambling code index is 0, otherwise, the scrambling code index is 1 (or 3), as can be seen from Table 5 , since the two cases The used scrambling code sequences with a length of 2 are orthogonal to each other. Therefore, the ACK / NACK message after scrambling simultaneously feeds back the information of whether the UE has detected the loss of downlink assignment, thereby achieving the purpose of scrambling.

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Abstract

The invention discloses a scrambling code selection method and a scrambling device. The scrambling code selection method comprises the following processing steps: cascading multiple ACK / NACK coding blocks to obtain a sequence to be scrambled; calculating the number Nbundled of physical downlink shared channels corresponding to ACK / NACK messages according to the number of the transmitted physical downlink shared channels VDAIUL corresponding to subframes indicated in an uplink authorization signaling and the fact whether downlink assignment loss is detected, and further calculating an index i; and selecting a scrambling code corresponding to the index i to scramble the sequence to be scrambled from the mapping relation between the index and the scrambling code, wherein the index i is determined according to the following rule: i=(Nbundled-1)mod4, if user equipment detects that at least one downlink assignment losses, Nbundled=VDAI+1 or Nbundled=VDAI+3, otherwise, Nbundled=VDAI, and mod represents modulo operation. The invention can improve the system reliability.

Description

technical field [0001] The present invention relates to the communication field, in particular to a scrambling code selection method and a scrambling device. Background technique [0002] figure 1 Shows the frame structure of the LTE (Long Term Evolution, long-term evolution) system TDD (Time Division Duplex, time division duplex) mode, in this frame structure, a 10ms radio frame (wireless frame) is divided into two half frames (half frame), each half frame is divided into 10 time slots with a length of 0.5 ms, and two adjacent time slots form a subframe with a length of 1 ms. One field contains 5 subframes. For Normal CP (Normal Cyclic Prefix, normal cyclic prefix), a slot contains 7 symbols with a length of 66.7μs, where the CP length of the first symbol is 5.21μs, and the CP length of the remaining 6 symbols is 4.69 μs; for Extended CP (extended cyclic prefix), one time slot contains 6 symbols, and the CP length of all symbols is 16.67 μs. exist figure 1 In the frame...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04W28/04
Inventor 朱艳艳张禹强李玉洁戴博
Owner NANTONG HUAXIN CENT AIR CONDITIONER
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