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Method for transmitting downlink control signaling of LTE-Advanced system

A technology for controlling signaling and evolving systems, applied in transmission systems, digital transmission systems, access restrictions, etc., can solve problems such as ambiguous payload size, imperfect interleaver, and increased number of blind detections, and reduce CRC false detections Probability, reduce implementation complexity, and reduce the effect of blind detection times

Active Publication Date: 2009-12-02
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0054] (1) Size is used as the benchmark for distinguishing DCI formats, so it is often necessary to compromise between new control information and matching sizes, resulting in a suboptimal DCI format solution;
[0055] (2) The number of blind inspections is equal to the product of the search position and the number of DCI formats, and the increase in the DCI format will lead to a significant increase in the number of blind inspections;
[0056] (3) Since more blind checks are required for each subframe, the average CRC false positive CRC checks time is reduced; false positive CRC checks will cause wrong ACK / NACK transmission on PUCCH and unauthorized uplink transmission;
[0057] (4) The ambiguity of the payload size (Payload size) of the DCI format. In Rel-8, padding bits are used to avoid ambiguous payload sizes and to distinguish different DCI formats. Padding Usually results in loss of PDCCH coverage
[0064] However, this scheme does not have the word length and related meanings of FI, the encoding schemes of various word lengths, the code rate of FI, the codeword after FI encoding and the interleaver of the codeword after DCI format convolutional code encoding, etc. Perfect, unable to meet the requirements of system implementation

Method used

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  • Method for transmitting downlink control signaling of LTE-Advanced system
  • Method for transmitting downlink control signaling of LTE-Advanced system
  • Method for transmitting downlink control signaling of LTE-Advanced system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0128] When the dedicated DCI indication information FI is 1 bit, it takes a value of 0 / 1 to indicate DL assignment / UL grant respectively. At this time, the proprietary DCI indication information is actually a type of proprietary DCI information.

[0129] Information bit sequence a of DCI format 0 , a 1 ,...,a A-1 (A is a positive integer) and the instruction information bit sequence f of the DCI format 0 Perform the first cascade to obtain the sequence f 0 , a 0 , a 1 ...a A-1 , wherein the DCIformat information is the aforementioned proprietary DCI information.

[0130] Use CRC check code to generate polynomial g CRC16 (D)=[D 16 +D 12 +D 5 +1] can be one of the following:

[0131] (1) For sequence f 0 , a 0 , a 1 ...a A-1 Add the CRC check digit to get the sequence f 0 , a 0 , a 1 ...a A-1 , l 0 , l 1 ,... l 15 , where l 0 , l 1 ,... l 15 is the CRC check code; use the UE's 16bit RNTI to mask the CRC check code to o...

no. 2 example

[0142] When FI is 2 bits, the values ​​00, 01, 10, and 11 respectively indicate a DCI format or a DCI format size, where FI is the aforementioned proprietary DCI indication information. At this time, the dedicated DCI indication information is actually the type or size of the dedicated DCI information.

[0143] Information bit sequence a of DCI format 0 , a 1 ,...,a A-1 (A is a positive integer) and the instruction information bit sequence f of the DCI format 0 f 1 Perform the first cascade to obtain the sequence f 0 , f 1 , a 0 , a 1 ...a A-1 , wherein the DCIformat information is the aforementioned proprietary DCI information.

[0144] Use CRC check code to generate polynomial g CRC16 (D)=[D 16 +D 12 +D 5 +1] can be one of the following:

[0145] (1) For sequence f 0 , f 1 , a 0 , a 1 ...a A-1 Add the CRC check digit to get the sequence f 0 , f 1 , a 0 , a 1 ...a A-1 , l 0 , l 1 ,... l 15 , where l 0 , l 1 ,.....

no. 3 example

[0156] When FI is 3 bits, it takes values ​​from 000 to 111, indicating a DCI format or a DCI format size respectively, where FI is the aforementioned proprietary DCI indication information. At this time, the dedicated DCI indication information is actually the type or size of the dedicated DCI information.

[0157] Information bit sequence a of DCI format 0 , a 1 ,...,a A-1 (A is a positive integer) and the DCI format indicates the information bit sequence f 0 f 1 f 2 Perform the first cascade to obtain the sequence f 0 , f 1 , f 2 , a 0 , a 1 ...a A-1 , wherein the information of the DCI format is the aforementioned proprietary DCI information.

[0158] Use CRC check code to generate polynomial g CRC16 (D)=[D 16 +D 12 +D 5 +1] can be one of the following:

[0159] (1) For sequence f 0 , f 1 , f 2 , a 0 , a 1 ...a A-1 Add the sequence f of the CRC check digit 0 , f 1 , f 2 , a 0 , a 1 ...a A-1 , l 0 , l 1 ,.....

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Abstract

The invention discloses a method for transmitting downlink control signaling of a LTE-Advanced system and aims to effectively reduce the frequency of a UE blind test. The method comprises the following steps: carrying out first cascade connection of CRC check codes of special DCI and the downlink control signaling; masking the CRC check codes by using RNTI of the UE to obtain a cascade connection mask sequence; coding indication information of the special DCI to obtain a special DCI indication information coding sequence; carrying out coding and speed matching of the cascade connection mask sequence to obtain a cascade connection mask coding sequence; carrying out second cascade connection and reordering of the special DCI indication information coding sequence and the cascade connection mask coding sequence to obtain an information block corresponding to a PDCCH of the UE; and processing and mapping the information blocks of a plurality of PDCCHs of a subframe to resource elements for transmitting. The technical proposal reduces the frequency of the UE blind test, the implementation complexity of UE and the probability of CRC false detection.

Description

technical field [0001] The invention relates to the field of mobile wireless communication, in particular to a method for sending downlink control signaling of an advanced long-term evolution (LTE-Advanced) system. Background technique [0002] Fig. 1 (a) and Fig. 1 (b) respectively show the long term evolution (Long Term Evolution, LTE) system frequency division duplex (Frequency Division Duplex, FDD) mode and time division duplex (TimeDivision Duplex, TDD) mode frame structure. [0003] In the frame structure of the FDD mode shown in Figure 1(a), a 10ms wireless frame (radioframe) consists of twenty slots (slots) with a length of 0.5ms and numbers 0 to 19, and slots 2i and 2i +1 to form subframe i with a length of 1 ms. [0004] In the frame structure of TDD mode shown in Figure 1(b), a 10ms radio frame is composed of two half frames with a length of 5ms, and a half frame contains five subframes with a length of 1ms. frame (subframe). Subframe i is defined as two time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04W28/06H04W48/12
Inventor 李卫军戴博郁光辉陈艺戬
Owner ZTE CORP
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