CN103581927A - Method for generating detection signal - Google Patents

Abstract

The invention provides a method for generating a detection signal. The method for generating the detection signal comprises the steps that a carrier type which is not backward compatible is introduced, the carrier type which is not backward compatible is set on a high-frequency section and a measurement period is long; a design method of positioning pilot frequency is reused, the new detection signal is only sent in a downlink sub frame when a system is configured to the state of detection signal sending, the sending bandwidth is the full bandwidth of the system, and the period ranges from 160ms to 1280ms; the method that the zadoff chu sequence and cycle shift are combined is applied, and the zadoff chu sequence is used as a signal discovery sequence of different cells. By the adoption of the method for generating the detection signal, a measurement period is long, the terminal power is effectively saved, and the frequency domain density is larger than that of an existing downlink signal used for synchronization, so that the precision of the measured SINR is high; enough orthogonal or half-orthogonal sequences are applied, a terminal can detect multiple cells at the same time, and cell planning difficulty is low.

Description

A kind of generation method of detection signal

Technical field

The present invention relates to detection signal field, relate in particular to the generation method of the detection signal on a kind of carrier wave that can be used for backward compatibility not.

Background technology

Along with extensively popularizing of intelligent terminal, increasing wireless data service occurs in indoor, and the feature of indoor business is Hypomobility, high traffic.In order to promote the performance of indoor focus business, optimisation technique can consider to increase bandwidth, improves spectrum efficiency, and increases cell density.At present LTE-Advanced supports the bandwidth of maximum 100MHz, if further increase system bandwidth, needs system works at high band more, and it is very limited to be applicable to the following frequency range of 3GHz of mobile context, considers to use frequency range more than 3GHz.High band propagation distance is shorter, indoor environment has strong scattering, for channeling has been created condition, and indoor coverage distance is little, have nomadic characteristic, be more suitable for indoor multi-antenna technology and improve spectrum efficiency, and indoor up-downgoing business is asymmetric, can introduce dynamic TDD technology, adapt to more flexibly different types of service.Macrocellular network and Microcell take different frequency ranges, can avoid the interference of minizone, and the data traffic of large covering and part is provided with macrocell, and the data service flow of grand net is shunted in Microcell.

In the simultaneous heterogeneous network scene of macrocell and indoor Microcell, need to strengthen the number of times that mobility measurements reduces terminal searching, thereby save the consumption of battery.In order to allow terminal save energy, a kind of method is to carry out subsidiary by terminal supplementary, as proximity information and positional information, these information can help base station to know when to carry out correct measurement, but obtaining these supplementarys itself just needs terminals consume energy.

Summary of the invention

The object of the invention is to introduce the detection signal on new carrier type, thereby solve in the situation that Microcell density is larger, measure the problem of expense.

For achieving the above object, technical scheme provided by the present invention is a kind of generation method of detection signal, the method is introduced the not carrier type of backward compatibility, and the carrier type of described not backward compatibility is arranged on the high band of 3GHz-60GHz, and be 160ms-1280ms measuring period; Reuse the method for designing of location pilot, described location pilot only sends in system configuration becomes the descending sub frame of positioning sub-frame, and the bandwidth of transmission is the full bandwidth of system, and the cycle is 160ms-1280ms; Adopt the method for zadoff chu sequence and cyclic shift combination as the discovery signals sequence of different districts.

Further, described location pilot density is 16 resource element/Resource Block, and frequency domain interval is 6 resource elements.

Further, between the different cyclic shifts of same sequence of described zadoff chu sequence, be quadrature, between different root sequences, there is certain correlation.

Further, the method for described zadoff chu sequence and cyclic shift combination is as follows

d(n)=x _u(n)e ^-jnα

Cyclic shift wherein n=0,1 ... N-1.

Adopt technique scheme, the beneficial effect that the present invention can realize has: adopt technique scheme, measuring period is long, effectively saves terminal power, and frequency domain density is greater than existing for synchronous downstream signal, makes the SINR precision of measurement high; The enough terminals of quadrature or semi-orthogonal sequence can detect a plurality of adjacent cells simultaneously, and plot planning difficulty reduces.

Accompanying drawing explanation

Fig. 1 is one embodiment of the invention schematic diagram;

Fig. 2 A, 2B is further embodiment of this invention schematic diagram.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

The invention provides a kind of generation method of detection signal, the method is introduced the not carrier type of backward compatibility, and carrier type is arranged on to high band, and band limits is 3GHz-60GHz, and be greater than existing measuring period measuring period, the value range of measuring period is 160ms-1280ms; Reuse location pilot, this new detection signal only sends in the descending sub frame of system configuration one-tenth transmission detection signal, and the bandwidth of transmission is the full bandwidth of system, time cycle is longer, for 160ms-1280ms, concrete, the cycle can be 160ms, 320ms, 640ms, 1280ms, its frequency domain density is greater than existing for synchronous downstream signal, density is 16 resource element/Resource Block, and frequency domain interval is 6 resource elements; Adopt the method for zadoff chu sequence and cyclic shift as the discovery signals sequence of different districts, between the different cyclic shifts of same sequence of described zadoff chu sequence, it is quadrature, between different root sequences, have certain correlation, the method for described zadoff chu sequence and cyclic shift combination is as follows

d(n)=x _u(n)e ^-jnα

Wherein, cyclic shift n=0,1 ... N-1.

Fig. 1 is one embodiment of the invention schematic diagram, and as shown in Figure 1, in figure, SCell is new carrier type, and carrier wave f1 is backward compatibility carrier wave, and as macrocell, and new carrier type f2-f4 is configured in higher frequency range, and backward compatibility not.From terminal angle, when UE1 does not configure in the situation of carrier aggregation, what UE will do is when receiving DS signal, carries out Microcell between frequency and measures, thereby be reduced in the cost of measuring between Microcell.And when terminal configuration carrier aggregation working method because will work with together with the carrier wave f1 of backward compatibility, and to receive f1 simultaneously, the data of f2 and f3, terminal will attempt detecting DL RS and carry out synchronously, CSI reports and mobility measurements.From microcell base station angle, only, when having signal to send, just send DL RS and DS, as carrier wave f2 and f3, and when no signal transmission, only send DS signal.

Fig. 2 A, 2B is further embodiment of this invention schematic diagram, as Fig. 2 A, shown in 2B, in order to reach the object of saving energy, need to meet three conditions:

One, longer measuring period, effectively save terminal power;

Two, the SINR precision of measuring is high, requires the density on frequency domain to be greater than existing for synchronous downstream signal;

Three, terminal can detect a plurality of adjacent cells simultaneously, will have enough quadratures or semi-perpendicular sequence to reduce the difficulty of plot planning, and this is for particularly important under the very large scene of deployment Microcell, local zone density.

The generation method of detection signal provided by the present invention, reuses the pattern of location pilot, but need to modify to the sequence of location pilot, has met three above-mentioned conditions.The feature of the location pilot defining in LTE Rel-9 is only in system configuration becomes the descending sub frame of positioning sub-frame, to send, and the bandwidth of transmission is the full bandwidth of system, and the cycle is configurable, can be configured to 160ms, 320ms, 640ms, 1280ms.This pilot tone meets higher density on frequency domain, and long these two conditions of time cycle, therefore consider to reuse this location pilot as detection signal.The problem of unique existence is that the orthogonality of this pilot tone is to obtain by the position on the frequency domain of pilot tone place, have 6 possible frequency domain positions, therefore also need to have more orthogonality or accurate orthogonality, to meet the requirement that picocell deployment density is high, the cyclic shift that the present invention introduces zadoff chu sequence realizes the 3rd condition.

Wherein zadoff chu sequence is as shown in the formula providing, and feature is between the different cyclic shifts of same sequence to be quadrature, has certain correlation between different root sequences:

$x_u\left(n\right)=\exp [-j\frac{\mathrm{\πun}(n+1)}{N_{\mathrm{ZC}}}],$ 0≤n≤N _ZC-l

N wherein _zcsize is the descending RB number of 2 times, and the number of descending RB is relevant to system bandwidth, and the RB number that is 20MHz as system bandwidth is 100.PSS sequence is also to use zadoff chu sequence, and the ID numerical value of different districts is corresponding basic sequence number u=25 respectively, and 29,34 sequence, only has 3 sequences to reuse, and plot planning is brought to very large burden.

In order to solve the plot planning that independent use zadoff chu sequence causes, bear large problem, the present invention adopts method that zadoff chu sequence and cyclic shift combine as the discovery signals sequence of different districts,

d(n)=x _u(n)e ^-jnα

Wherein, cyclic shift

$\mathrm{\α}=n\left(\frac{2\mathrm{\π}}{N}\right),$ n=0，1……N-1，

Relevant with Microcell density, because the density of Microcell is changing, therefore according to different Microcell density, by high-level signaling, N is set, for example, if terminal need to detect 12Ge community simultaneously, N=12 can be set.Be that N is the community number that terminal need to detect simultaneously.

The generation method of detection signal provided by the present invention, in order to reduce the cost of measurement, can design detection signal and there is longer measuring period, on this basis, improve the precision of the SINR of measurement, and require terminal the detection signal of a plurality of adjacent cells can be detected simultaneously.In order to meet above-mentioned three requirements, first the density of this signal be greater than existing for synchronous downstream signal, to improve the precision of the SINR of measurement; The cycle sending will be grown, effectively to save the power of terminal; Have enough quadratures or semi-perpendicular sequence to reduce the difficulty of plot planning, this is particularly important under the very large scene of deployment Microcell, local zone density.

Here the new detection signal of introducing is reused the pattern of the position location pilot signal in Rel-9, because the signal density of location pilot is large, cycle is long, meet the first two requirement proposing, in order to meet the 3rd requirement, the sequence of new detection signal is realized to the numerical value of concrete cyclic shift by the mode that zadoffchu sequence adds cyclic shift, density according to Microcell, configures by high-level signaling.

Microcell is operated on the new carrier type with new detection signal, can only in the subframe that receives new detection signal, measure, thereby alleviate the expense cost of measurement.

The above embodiment has only expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (4)

1. a generation method for detection signal, is characterized in that:

Introduce the not carrier type of backward compatibility, the carrier type of described not backward compatibility is arranged on the high band of 3GHz-60GHz, and be 160ms-1280ms measuring period;

Reuse the method for designing of location pilot, described location pilot only sends in system configuration becomes the descending sub frame of positioning sub-frame, and the bandwidth of transmission is the full bandwidth of system, and the cycle is 160ms-1280ms;

Adopt the method for zadoff chu sequence and cyclic shift combination as the discovery signals sequence of different districts.

2. the generation method of detection signal according to claim 1, is characterized in that: described location pilot density is 16 resource element/Resource Block, and frequency domain interval is 6 resource elements.

3. the generation method of detection signal according to claim 1, is characterized in that: between the different cyclic shifts of same sequence of described zadoff chu sequence, be quadrature, between different root sequences, have certain correlation.

4. the generation method of detection signal according to claim 1, is characterized in that: the method for described zadoff chu sequence and cyclic shift combination is as follows

d(n)=x _u(n)e ^-jnα

Cyclic shift wherein

n=0,1 ... N-1.

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