WO2012106991A1

WO2012106991A1 - Method and device for activating and detecting control information

Info

Publication number: WO2012106991A1
Application number: PCT/CN2012/070986
Authority: WO
Inventors: 戴晓明; 黄琛; 唐胜志
Original assignee: 电信科学技术研究院
Priority date: 2011-02-12
Filing date: 2012-02-09
Publication date: 2012-08-16
Also published as: CN102142946A; CN102142946B

Abstract

Disclosed are a method and device for activating and detecting control information. The method includes: determining a detection symbol and a detection symbol/control information modulation constellation point; and according to the detection symbol and the detection symbol and control information modulation constellation point, judging whether the control information is carried or not. The present invention can effectively reduce the probability of false detection of the control information.

Description

Method and device for controlling information activation detection This application claims to be submitted to the Chinese Patent Office on February 12, 2011, the application number is 201110037140.2, and the invention name is

The priority of the Chinese Patent Application, which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for controlling information activation detection. Background Art In a wireless communication system, in order to ensure normal transmission of a traffic channel, it is notified by feedback control information whether the traffic channel is correctly received or the wireless channel shield. However, when the control information should be sent, but the sender does not send the control information due to some abnormal conditions, the receiver will still send the control information by default, and the problem will occur: The receiver will go to the resource without sending the control information. Detecting control information, causing virtual detection, will affect the normal transmission of the traffic channel.

The existing schemes are divided into two categories: A type of default UE (User Equipment) sends control information and directly performs detection and judgment of control information. The disadvantages of this type of scheme are: virtual detection of control information; The class performs the activation detection of the control information: using the detection symbol and the control symbol Euclidean distance or using the correlation between the detection symbol and the control symbol to determine whether the UE transmits the control information, the existing scheme of this type is insufficient: Whether the UE sends control information.

The ACK/NACK (Acknowledgement/ Negative Acknowledgement) information corresponding to the PDSCH (Physical Downlink Shared Channel) carried by the PUSCH (Physical Uplink Shared Channel) is For example, the shortcomings of the existing solutions are:

The detection schemes of the ACK/NACK carried by the existing PUSCH are classified into two types: a third type and a fourth case that do not consider the above description, that is, the default UE sends ACK/NACK information, and performs ACK/NACK information detection. Judge. This type of scheme will cause virtual detection of ACK/NACK information, especially if the detection result at this time is judged as ACK information, which will seriously affect the normal transmission of the traffic channel, resulting in leakage of traffic channel data; Activation detection of the /NACK information: Whether the UE transmits the ACK/NACK information by using the detected symbol with the ACK/NACK symbol Euclidean distance or by using the detected symbol and the ACK/NACK symbol correlation. However, at present, there is no better way to effectively judge whether the UE has sent ACK/NACK information, and it is unable to reach the detection index given by RAN4 (RAN WG4) for wireless performance and protocol. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a method and device for controlling activation of information to reduce the false detection probability of control information.

In the embodiment of the present invention, a method for detecting activation of a control information is provided, which includes the following steps:

Determining the detection symbol, and detecting the symbol and the control information to modulate the constellation point;

The control information is judged according to the detection symbol, and the detection symbol and the control information modulation constellation point. An apparatus for controlling activation of information is further provided in the embodiment of the present invention, including:

a determining module, configured to determine a detection symbol, and to detect a symbol and a control information modulation constellation point;

The determining module is configured to determine whether the control information is carried according to the detection symbol, and the detection symbol and the control information modulation constellation point.

The beneficial effects of the present invention are as follows:

The technical solution provided by the embodiment of the present invention can perform activation detection on the control information, and can effectively reduce the false detection probability of the control information.

Further, in particular, the detection of the HARQ-ACK information carried on the PUSCH in the LTE system can effectively reduce the false detection probability of the ACK/NACK information, achieve the ACK false alarm and the missed detection indicator proposed by the LTE RAN4, and reduce the probability of the PDSCH leakage transmission. , to ensure the normal transmission of traffic channels. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic flowchart of a method for implementing control information activation detection according to an embodiment of the present invention;

2 is a schematic diagram of a process of transmitting ACK/NACK information of a PUSCH according to an embodiment of the present invention; and FIG. 3 is a schematic structural diagram of an apparatus for detecting activation of a control information according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The inventors have noticed during the invention that: Among the control information, ACK/NACK information is more important. Below

The ACK/NACK information corresponding to the PDSCH carried by the PUSCH is described as an example.

The LTE (Long Term Evolution) specification indicates that users can carry feedback information through the PUSCH, such as ACK/NACK, RI ( Rank Indicator, Rank Information Indicator), PMI (Precoding Matrix Index), CQI (Channel). Quality Indicator, channel shield indication, etc., where ACK/NACK is important for the transmission process of the downlink traffic channel. The base station determines whether to send new downlink traffic channel data to the user by detecting ACK/NACK, or according to HARQ (Hybrid Automatic Repeat Request). , Hybrid Automatic Repeat Request) The process resends the last downlink traffic channel data. For the transmission of ACK/NACK and the detection of HARQ-ACK by the base station, there are several possibilities:

1. If the UE correctly receives the PDCCH (Physical Downlink Control Channel) information for scheduling the PDSCH and detects the PDSCH, and generates ACK/NACK, there are two possibilities: 1) If the UE also receives Scheduling the PDCCH of the PUSCH, and instructing to transmit the PUSCH on the subframe in which the HARQ-ACK is fed back, the UE transmits the PUSCH data, and carries the ACK/NACK on the PUSCH, and the base station ACKs the location of the ACK/NACK on the PUSCH. /NACK detection and decoding, but there may be cases of missed detection.

2) If the UE does not correctly receive the PDCCH for scheduling the PUSCH, the UE does not transmit the PUSCH, and therefore does not send the ACK/NACK. This is equivalent to transmitting the noise, but the base station does not know that the UE has not sent the PUSCH and has not sent. ACK/NACK, therefore, ACK/NACK detection is still performed according to the location where the ACK is carried on the PUSCH, causing virtual detection.

2. If the UE does not correctly receive the PDCCH scheduling the PDSCH, the UE will not generate an ACK/NACK, but the e-NodeB will still detect the ACK/NACK at the location where the PUSCH carries the ACK/NACK, and may be judged as an ACK. There may also be two situations at this time:

1) If the UE also receives the PDCCH scheduling the PUSCH, the UE will transmit the PUSCH but will not carry the ACK/NACK on the PUSCH. At this time, the data at the location where the PUSCH should carry the ACK/NACK is still the service data of the PUSCH, but the base station does not know that the UE does not send the ACK/NACK, and still carries on the PUSCH.

ACK/NACK is detected at the location of the ACK/NACK, which may cause a false check.

2) If the UE does not correctly receive the PDCCH for scheduling the PUSCH, the UE does not transmit the PUSCH, and therefore does not transmit the ACK/NACK, so this time is equivalent to noise, but the base station does not know that the UE neither transmits the PUSCH nor transmits. ACK/NACK will still detect ACK/NACK on the location where the ACK/NACK is carried on the PUSCH, so it may cause a false check.

In summary, there are four cases in the corresponding location of the HARQ-ACK that should be carried on the PUSCH: 1) The ACK is carried;

2) carrying a NACK;

3) For the PUSCH service data, there is no ACK/NACK;

4) Random noise.

The existing schemes are divided into two categories: One category does not consider the third and fourth cases described above, that is, the default UE transmits ACK/NACK information, and performs ACK/NACK information detection and judgment. This type of scheme will cause false detection of ACK/NACK information, especially if the detection result at this time is judged as ACK information, which will seriously affect the normal transmission of the traffic channel, resulting in leakage of traffic channel data; Activation detection of /NACK information: Judging the Euclidean distance of the detected symbol with the ACK/NACK symbol or using the correlation between the detected symbol and the ACK/NACK symbol Whether the UE has sent ACK/NACK information. However, there is currently no better way to effectively judge this type of scheme.

Whether the UE sends ACK/NACK information, cannot work for wireless performance and protocol. RAN4 ( RAN

WG4) gives the test indicators.

In view of this, the technical solution provided by the embodiment of the present invention reduces the probability of virtual detection of control information by introducing a manner in which control information is activated and detected. Specific embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, the ACK/NACK information corresponding to the PDSCH carried by the LTE system PUSCH is mainly taken as an example to introduce the ACK/NACK information activation detection scheme to reduce the false detection probability of the ACK/NACK information.

1 is a schematic flowchart of a method for implementing control information activation detection. As shown in the figure, the method may include the following steps: Step 101: Determine a detection symbol, and detect a symbol and a control information modulation constellation point;

Step 102: Determine, according to the detection symbol, and the detection symbol and the control information modulation constellation point, whether the control information is carried.

In the implementation, according to the detection symbol, and the detection symbol and the control information modulation constellation point to determine whether the control information is carried, the method may include:

The equivalent signal-to-noise ratio is constructed according to the detection symbol, and the detection symbol and the control information modulation constellation point, and whether the control information is transmitted is determined by the magnitude of the equivalent signal-to-noise ratio.

In implementation, constructing an equivalent signal to noise ratio may include:

The number of correlations between the detected symbol and the control information modulation constellation point is a numerator, and the distance between the detected symbol and the control information modulation constellation point is a denominator.

In practice, the distance between the detection symbol and the control information modulation constellation point can be measured by the Euclidean distance.

Specifically, in the implementation, it is assumed that a total of ρ ' control information symbols are used, so that = ι, 2 - ρ ' is a detection symbol, and s _q ^ctrl is a modulation constellation point constructed by the control information.

The equivalent signal-to-noise ratio of the control information receiving symbol is used as an index quantity to determine whether the control information is carried, to detect the correlation between the symbol and the control information modulation constellation point as a numerator, to detect the distance between the symbol and the control information modulation constellation point (eg Euclidean distance) is the amount of the denominator to determine whether or not the control information is carried at these locations. Wherein, the correlation number of the received detection symbol and the control information modulation constellation point may be regarded as a signal component, and the distance between the reception detection symbol and the control information modulation constellation point (such as Euclidean distance) may be regarded as a noise component.

If the control information is carried, the numerator of the ratio tends to control the total power of the information modulation constellation point, and the denominator tends to zero, then the ratio tends to infinity. If the control information is not carried, and the received data is random data or noise, then the numerator of the ratio tends to zero, and the denominator tends to control the total power of the information modulation constellation point, then the ratio tends to zero. Determining whether the control information is sent by comparing the ratio with a certain threshold value: if the ratio is greater than the threshold value, it is determined that the control information is sent; if the ratio is less than the threshold value, it is determined that the control information is not sent .

In implementation, the control information may include one of the following information: ACK/NACK message carried by the PUSCH in the LTE system Information, CQI information, RI information.

In the implementation, for the judgment of the ACK/NACK information, the index quantity of the ACK and the index quantity of the NACK can be respectively obtained, and the size of the two index quantities is first compared, and then the larger index quantity is compared with the threshold value, and finally Whether the ACK/NACK information is sent, that is, when the control information is the ACK/NACK information, determining whether the ACK/NACK information is sent may include:

If the ACK indicator is greater than the NACK indicator, and

If the indicator quantity of the ACK is greater than the threshold value, it is determined that the ACK information is sent;

If the ACK index is less than the threshold, it is determined that the ACK/NACK information is not sent.

If the ACK indicator is smaller than the NACK indicator, and

If the indicator quantity of the NACK is greater than the threshold value, it is determined that the NACK information is sent;

If the index of the NACK is less than the threshold, it is determined that the ACK/NACK information is not transmitted.

Wherein: when calculating the index quantity of the ACK, the control information modulation constellation point is a modulation constellation point when the control information is ACK, and when calculating the index quantity of the NACK, the control information modulation constellation point is a modulation constellation point when the control information is NACK.

In the implementation, when the equivalent signal-to-noise ratio is constructed, when the symbols of the control information are determined to be repeated, the received detection symbols may be averaged first, and then the equivalent signal-to-noise ratio is constructed by constructing the constellation points with the control information.

Specifically, if the symbols of the control information are repeated, when the index quantity is calculated, the received detection symbols may be averaged first, and then the correlation values and distances are calculated by constructing the constellation points with the control information.

If the control information is carried, the numerator of the ratio tends to control the power of the information modulation constellation point, and the denominator tends to zero, then the ratio tends to infinity. If the control information is not carried, and the received data is random data or noise, then the numerator of the ratio tends to zero, and the denominator tends to control the power of the information modulation constellation point, then the ratio tends to zero. Similarly, comparing the ratio with a certain threshold to determine whether the control information is sent: if the ratio is greater than the threshold, then it is determined that the control information is sent; if the ratio is less than the threshold, then the determination is not sent. Control information.

The following describes the detection process of ACK/NACK information by taking the 1-bit ACK/NACK information of the PUSCH in the LTE system as an example. It should be noted that the detection of the PUSCH bearer greater than 1-bit ACK/NACK information in the LTE system, and the detection of the PUSCH-bearing CQI and RI information may be processed by using the extension scheme of the embodiment, and the core algorithm uses the above description. Algorithm.

In order to more clearly describe the activation detection process of the PUSCH bearer HARQ-ACK information, it is necessary to describe the transmission process of the HARQ-ACK information. Therefore, the transmission process of the PUSCH bearer 1-bit ACK/NACK information in the LTE system is first introduced. A schematic diagram of a PUSCH carrying ACK/NACK information transmission process, as shown in the figure, mainly includes the following processing:

1. Calculate the number of coded bits.

According to the 36.211 protocol of the LTE RAN1 standard, the HARQ-ACK information coding and modulation will be occupied. Symbol.

2. Encoding, adding 4 and filling.

When the original bit length of the PUSCH is 1, the following encoding process is performed:

1) Encode according to the following table to get 6^

Table 1: 1-bit HARQ-ACK coding

2) Cascading ρ 'repetitive coding blocks according to Q ^}

q ^K = b ^ACK (mod(n,Q _m )), n = 0X-Q _ACK -l

3) If the TDD (Time Division Duplex) ACK/NACK mode is bundling, you need to use scramble.

] is generated according to the following table, where '' = (^* _d -l) mod4, N _{bundled is} determined according to Section 7.3 of 36.213; as in other scenarios, enter 4); Table 2: TDD ACK/NACK bundling scrambling code sequence

4) The ^κ sequence is padded into the PUSCH encoded sequence b(f).

5) The PUSCH encoded sequence is scrambled, so that Mbit is the total length of the PUSCH encoded sequence. When scrambling, replace the X flag with "1" and the y flag with the previous bit of y. This scrambling will make

The ACK/NACK information symbols will be modulated at the four corners of the most edge of the constellation point.

The implementation of the reception decoding process of 1-bit ACK/NACK information will be described below.

1) If the ACK/NACK mode is bundling in the TDD system, the received information q ^CK , q ^K , q ^{K needs to} be descrambled with [w^wi^w ^ ^] to obtain the descrambled ACK/NACK sequence. among them[! ^ ! ^ ] is generated according to Table 2, where = (N _torfferf _l) _mod4 , where the value of bundled is explained below.

As in other scenarios, the ACK/NACK sequence is equal to and enters 2; 2) reconstructing the detection symbols of the ACK/NACK information according to the descrambled ACK/NACK sequence 3⁄4^ and the PUSCH modulation order Q _M :

Among them, QPSK (Quadature Phase Shift Keying) modulation, £>

16QAM (Quadature Amplitude Modulation) modulation, D = \! 64QAM modulation, D = 1/V42.

3) Calculate the index quantity by the following formula, where the numerator is the correlation number between the detection symbol and the control information modulation constellation point, and the denominator is the Euclidean distance of the detection symbol and the control information modulation constellation point. It should be understood by those skilled in the art that the formula is a specific formula given in the example description, and the method for calculating the equivalent signal to noise ratio used in the specific implementation in the specific implementation includes, but is not limited to, the following formula.

Value _ measured _ACK =

The amount of ACK indicator:

Real ∑ S _q - conj S ^ACK )

q=

Value measured NACK

NACK

■S

NACK indicator quantity: q=

4) Determine whether to send ACK/NACK according to the indicator quantity obtained by 3): After obtaining the index quantity of ACK and NACK, select a larger index quantity and compare the threshold value, if the maximum index quantity of the constellation point is greater than the threshold If the value is less than the threshold value, the ACK/NACK information is not sent on the PUSCH.

Based on the same inventive concept, an embodiment of the present invention provides a device for detecting activation of a control information. Since the principle of solving the problem is similar to the method for detecting activation of the control information, the implementation of the device can refer to the implementation of the method. , the repetition will not be repeated.

FIG. 3 is a schematic structural diagram of a device for detecting activation of a control information, as shown in the figure, which may include:

The determining module 301 is configured to determine the detection symbol, and the detection symbol and the control information modulation constellation point; the determining module 302 is configured to determine, according to the detection symbol, the detection symbol and the control information modulation constellation point, whether the control information is carried.

In an implementation, the judging module may be further configured to construct an equivalent signal to noise ratio according to the detection symbol, and the detection symbol and the control information modulation constellation point when determining whether the control information is carried according to the detection symbol and the detection symbol and the control information modulation constellation point. And determine whether the control information is sent by the magnitude of the equivalent signal to noise ratio. In implementation, the determining module may be further configured to: when detecting the equivalent signal to noise ratio, the correlation number of the detected symbol and the control information modulation constellation point is a numerator, and the distance between the detected symbol and the control information modulation constellation point is a denominator.

In implementation, the judging module can be further used to use the Euclidean distance as the distance between the detection symbol and the control information modulation constellation point.

In the implementation, the judging module may be further configured to: when determining the symbol of the control information is repeated when constructing the equivalent signal to noise ratio, first averaging the received detection symbols, and constructing an equivalent signal to noise ratio with the control information constructing the constellation points.

In the implementation, the control information includes one of the following information: ACK/NACK information, CQI information, and RI information carried by the PUSCH in the LTE system.

In an implementation, the determining module may be further configured to: when the control information is ACK/NACK information, determine whether the ACK/NACK information is sent:

If the ACK indicator is greater than the NACK indicator, and

If the ACK index is greater than the threshold, then it is determined that the ACK information is sent.

If the ACK indicator is smaller than the NACK indicator, and

If the index of the NACK is greater than the threshold, then it is determined that the NACK information is sent.

For convenience of description, the various parts of the above described devices are described in terms of functions divided into various modules or units. Of course, the functions of the various modules or units may be implemented in one or more software or hardware in the practice of the invention.

It can be seen from the above embodiments that the technical solution provided by the embodiment of the present invention can perform activation detection on control information, in particular, ACK/NACK information.

Specifically, the equivalent signal to noise ratio can be constructed, and whether the control information (such as ACK/NACK information) is sent by using the equivalent signal to noise ratio;

Specifically, the SNR of the equivalent signal to noise ratio is a correlation value between the detection symbol and the control information construction symbol; the denominator of the equivalent signal to noise ratio is the distance between the detection symbol and the control information construction symbol, and the distance can use the Euclidean distance;

Further, if the control information has the characteristics of repeated coding, the detected signal may be averaged and then the equivalent signal to noise ratio may be calculated;

This solution is applicable to the detection of control information, including but not limited to the following scenarios: Detection of ACK/NACK information, CQI information, and RI information carried by the PUSCH in the LTE system.

The technical solution provided by the embodiment of the present invention provides a new control information detection scheme, which can perform activation detection on the control information, and effectively reduce the virtual detection probability of the control information. In particular, it is applied to the detection of the HARQ-ACK information carried on the PUSCH in the LTE system, which can effectively reduce the false detection probability of the ACK/NACK information, achieve the ACK false alarm and miss detection indicators proposed by the LTE RAN4, reduce the probability of PDSCH leakage transmission, and guarantee the service. Normal transmission of the channel.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program. Product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention is in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, it is intended that the present invention cover the modifications and modifications of the inventions

Claims

Rights request

A method for controlling information activation detection, comprising the steps of:

The control information is judged according to the detection symbol, and the detection symbol and the control information modulation constellation point.

2. The method according to claim 1, wherein determining whether the control information is carried according to the detection symbol and the detection symbol and the control information modulation constellation point comprises:

3. The method of claim 2, wherein constructing an equivalent signal to noise ratio comprises:

4. The method according to claim 3, wherein the distance between the detected symbol and the control information modulation constellation point is measured by an Euclidean distance.

The method according to claim 3, wherein when constructing the equivalent signal to noise ratio, determining that the symbols of the control information are repeated, first averaging the received detection symbols, and constructing a constellation point structure with the control information, etc. Effective signal to noise ratio.

The method according to any one of claims 3 to 5, wherein the control information comprises one of the following information: an acknowledgement/negative acknowledgement ACK/NACK information of a physical uplink shared channel PUSCH bearer in a Long Term Evolution (LTE) system, The channel shield indicates CQI information and the rank information indicates RI information.

The method according to claim 6, wherein when the control information is ACK/NACK information, determining whether the ACK/NACK information is sent includes:

If the ACK indicator is greater than the NACK indicator, and

If the ACK indicator is smaller than the NACK indicator, and

8. A device for controlling information activation detection, comprising:

The device according to claim 8, wherein the determining module is further configured to: according to the detection symbol, and the detection symbol and the control information modulation constellation point, determine whether the control information is carried, according to the detection symbol, and The measured symbol and the control information modulation constellation point construct an equivalent signal to noise ratio, and determine whether the control information is transmitted by the magnitude of the equivalent signal to noise ratio.

The device according to claim 9, wherein the determining module is further configured to: when detecting the equivalent signal to noise ratio, detect the correlation between the symbol and the control information modulation constellation point as a numerator to detect the symbol and the control information. The distance of the modulation constellation point is the denominator.

The apparatus according to claim 10, wherein the judging module is further configured to use the Euclidean distance as the distance between the detection symbol and the control information modulation constellation point.

The device according to claim 10, wherein the determining module is further configured to: when determining the symbol of the control information is repeated when constructing the equivalent signal to noise ratio, first averaging the received detection symbols, and then controlling The information constructs constellation points to construct an equivalent signal to noise ratio.

The device according to any one of claims 10 to 12, wherein the control information comprises one of the following information: ACK/NACK information, CQI information, and RI information carried by the PUSCH in the LTE system.

The device according to claim 13, wherein the determining module is further configured to: when the control information is ACK/NACK information, determine whether the ACK/NACK information is sent:

If the ACK indicator is greater than the NACK indicator, and

If the ACK indicator is smaller than the NACK indicator, and