CN104348564B - A Method for Determining Received Power of Reference Signal - Google Patents

Abstract

A kind of method determining Reference Signal Received Power, described method includes: determine that in the synchronizing signal that UE receives the channel of the interference signal of the corresponding adjacent cell of current maximum correlation peak is estimated；Estimated to obtain the valuation of the interference signal of described adjacent cell by the channel of the interference signal of described adjacent cell；Rejecting the valuation of the interference signal of described adjacent cell in the synchronizing signal that UE receives, the synchronizing signal receiving UE is updated to reject the synchronizing signal after the valuation of the interference signal of described adjacent cell；The RSRP of adjacent cell described in the channel estimation calculation of the interference signal according to described adjacent cell；The channel of the interference signal redefining the corresponding adjacent cell of current maximum correlation peak is estimated.After the application embodiment of the present invention, the resource for measuring RSRP increases, and then can obtain multiple RSRP at short notice, thus improves the report precision of RSRP.

Description

A Method for Determining Received Power of Reference Signal

technical field

The present application relates to the field of communication technologies, and more specifically, to a method for determining received power of a reference signal.

Background technique

The LTE230 system is a wireless network that works in the 230M frequency band and is oriented to applications such as power system data collection, power distribution control, and video communication. The LTE230 system includes service terminals, access network, core network, master station and operation and maintenance center, etc.

The LTE230 system signal spectrum is distributed in discrete frequency points in the 230 frequency band, and the frequency point interval is 25kHz. The modulation method of the signal on each frequency point is Orthogonal Frequency Division Multiplexing (OFDM). Each frequency point has 10 effective subcarriers. LTE230 is a TDD system, a signal frame consists of uplink, downlink and a special time slot. The length of each frame is 25ms, and there are 5 subframes in total, of which 3 subframes are occupied for the uplink, 1 subframe for the downlink, and one frame is occupied by the special time slot. Each cell of the LTE230 system has 3 synchronization frequency points, and the cell broadcast and synchronization signals are sent alternately every other frame on the synchronization frequency points.

The user (UE) of the LTE230 system needs to measure the RSRP of the neighboring cell. RSRP measurement is carried out on the pilot signal on the broadcast frame on the synchronous frequency point.

There are only 13 pilot signals on the broadcast frame, and the number is limited. When the signal is weak, such as at the cell edge, the RSRP measurement accuracy becomes poor. In order to ensure the RSRP measurement accuracy, the physical layer needs to use multiple RSRP measurements for filtering. In order to improve the measurement accuracy of RSRP, the physical layer needs to use multiple RSRP measurements for filtering. Not only increases the time interval of the measurement report, but also limits the moving speed of the UE.

Contents of the invention

The embodiment of the present invention proposes a method for determining the received power of a reference signal, which increases resources for measuring RSRP, and then obtains multiple RSRPs in a short time, thereby improving the measurement accuracy of RSRP.

The technical scheme of the embodiment of the present invention is as follows:

A method for determining received power of a reference signal, the method comprising:

Determine the channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak in the synchronization signal received by the user UE;

Obtaining an estimate of the interfering signal of the neighboring cell from the channel estimation of the interfering signal of the neighboring cell;

Deleting the estimate of the interference signal of the adjacent cell from the synchronization signal received by the UE, and updating the synchronization signal received by the UE to a synchronization signal after removing the estimate of the interference signal of the adjacent cell;

calculating the reference signal received power RSRP of the neighboring cell according to the channel estimation of the interference signal of the neighboring cell;

The channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak is re-determined.

The channel estimation for determining the interference signal of the adjacent cell corresponding to the current maximum correlation peak in the synchronization signal received by the UE includes:

Use the label ID of the cell and the ID of the neighboring cell to generate the synchronization code of the cell;

The synchronization code of the current cell is correlated with the synchronization signal received by the UE to determine the synchronization code of the interference signal corresponding to the current maximum correlation peak;

The channel estimation of the current maximum correlation peak corresponding to the interference signal of the adjacent cell is determined from the synchronization code of the current cell and the synchronization code of the interference signal of the adjacent cell corresponding to the current maximum correlation peak.

The obtaining the estimate of the interference signal of the adjacent cell from the channel estimation of the interference signal of the adjacent cell includes:

The product of the channel estimate of the interference signal of the adjacent cell and the synchronization code of the interference signal of the adjacent cell is equal to the estimated value of the interference signal of the adjacent cell.

The removing the estimation of the interference signal of the neighboring cell from the synchronization signal received by the UE includes: subtracting the estimation of the interference signal of the neighboring cell from the synchronization signal received by the UE.

The calculating the RSRP of the neighboring cell according to the channel estimation of the interference signal of the neighboring cell includes:

The RSRP of the neighboring cell=E(||H||2)-G, H is the channel estimate of the interference signal of the neighboring cell, E(x) is the expectation of x, and G is the receiver gain.

It can be seen from the above technical solutions that in the embodiment of the present invention, the channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak is determined in the synchronization signal received by the UE; obtained from the channel estimation of the interference signal of the adjacent cell Estimation of the interference signal of the neighboring cell; removing the estimation of the interference signal of the neighboring cell from the synchronization signal received by the UE, and updating the synchronization signal received by the UE to the estimation of the interference signal of the neighboring cell Calculate the RSRP of the adjacent cell according to the channel estimation of the interference signal of the adjacent cell; re-determine the channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak. Since the synchronization signal is used as a resource for measuring the RSRP, resources for measuring the RSRP increase, and multiple RSRPs can be obtained in a short time, thereby improving the measurement accuracy of the RSRP.

Description of drawings

Fig. 1 is a schematic flowchart of a method for determining received power of a reference signal.

detailed description

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

In the embodiment of the present invention, from the synchronization signal received by the UE, the RSRP of each neighboring cell is gradually calculated by eliminating the interference signal of the neighboring cell corresponding to the current maximum correlation peak. Since there are as many as 144 synchronization signals in the synchronization frame, which is far greater than the number of 13 pilot signals in the broadcast frame, the resources used to measure RSRP increase, and multiple RSRPs can be obtained in a short time, thereby improving the measurement of RSRP precision.

Referring to accompanying drawing 1, it is a schematic flow diagram of a method for determining the received power of a reference signal, which specifically includes the following steps:

101. Determine, from a synchronization signal received by a UE, a channel estimate of an interference signal of a neighboring cell corresponding to a current maximum correlation peak.

The synchronization signal received by the UE from the 1st subcarrier to the kth carrier is:

$\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}}{\overset{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; sync</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, N _sync is the number of synchronization signals received; S _i (l, k) is a synchronization signal, S ₀ (l, k) is a synchronization signal of this cell, and others are synchronization signals of neighboring cells; H _i (l, k ) is the channel of the i-th synchronization signal; N(l,k) is the noise.

(a) Generate the synchronization code of this cell by using the known ID of this cell and the ID number of the neighboring cell

(b) with synchronization code Correlate with the received signal Y (l, k) to find the synchronization code that produces the current maximum correlation peak corresponding to the interference signal of the adjacent cell

(c) By the synchronization code of the cell The current maximum correlation peak corresponds to the synchronization code of the interference signal of the adjacent cell Determine the channel H _m0 (l,k) channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak

102. Obtain an estimate of the interference signal of the adjacent cell from the channel estimation of the interference signal of the adjacent cell.

The product of the channel estimate of the interference signal of the adjacent cell and the synchronization code of the interference signal of the adjacent cell is equal to the estimated value of the interference signal of the adjacent cell. That is, the estimation of the interference signal of the adjacent cell

103. Remove the estimated interference signal of the adjacent cell from the synchronization signal received by the UE, and update the synchronization signal received by the UE to the synchronization signal after removing the estimated interference signal of the adjacent cell.

In the LTE230 system, each synchronization frame occupies 144 synchronization signals, that is, 144 synchronization signals can be used to measure RSRP in the present invention. The synchronization signal received by the UE not only includes the signal of the current cell, but also includes the signal of the neighboring cell. First, the synchronization code that generates the current maximum correlation peak is found, and the interference signal of the adjacent cell corresponding to the maximum correlation peak is eliminated from the synchronization signal received by the UE. Then find the interference signal of the adjacent cell corresponding to the current maximum correlation peak, and eliminate the interference signal again. In this way, the interference signals of adjacent cells are eliminated in sequence according to the largest correlation peak. If there is no correlation peak, it means that all synchronization signals have been eliminated from the synchronization signals received by the UE.

In the process of eliminating the interference signal of the adjacent cell, the channel estimation of the interference signal of the adjacent cell can be determined, and the RSRP can be calculated by using the channel estimation of the interference signal of the adjacent cell.

The interference signal of the adjacent cell is eliminated from the synchronization signal received by the UE, that is, the estimate is obtained by subtracting the interference signal of the adjacent cell from the synchronization signal received by the UE.

${\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span>{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span>{\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; h</span>}}}_{\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Since the synchronization signal received by the UE includes the interference signals of all adjacent cells, in order to sequentially remove the interference signals of the adjacent cells from the synchronization signal received by the UE, it is necessary to update the synchronization signal received by the UE to the interference signal of the removed adjacent cells After the synchronization signal. That is, the synchronization signal received by the UE is updated to the synchronization signal Y ₁ (l, k) after removing the interference signal of the neighboring cell.

104. Calculate the RSRP of the neighboring cell according to the channel estimation of the interference signal of the neighboring cell.

According to the existing technology, the RSRP of the neighboring cell=E(||H|| ² )-G, H is the channel estimation of the interference signal of the neighboring cell, the expectation of E(x)x, and G is the receiver gain.

Since the synchronization signal received by the UE includes the interference signals of all adjacent cells, the RSRP of the adjacent cell can be calculated by using the channel estimation of the interference signals of the adjacent cells. Since the synchronization frame occupies 144 symbols, that is, 144 synchronization signals, it is obvious that more RSRPs can be obtained compared with the prior art, thus improving the measurement accuracy of RSRPs.

105. Re-determine the channel estimation of the interference signal of the neighboring cell corresponding to the current maximum correlation peak.

The synchronization signal received by the UE includes not only the signal of the current cell, but also the interference signal of the neighboring cell. After removing the interference signal of the neighboring cell corresponding to the current largest correlation peak, if there is a largest correlation peak in the synchronization signal after removing the interference signal of the neighboring cell, it needs to be explained that there is still an interference signal in the synchronization signal received by the UE. According to the ID of the cell, it can be determined whether the interference signal is the interference signal of the neighboring cell or the interference signal of the own cell. Therefore, it is necessary to reacquire the channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak. That is, step 101 is executed, and when there is no maximum correlation peak, it means that there is no interference signal in the synchronization signal received by the UE.

The technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

(A) Use the known cell ID and neighbor cell ID to generate cell synchronization code

(B) Use synchronization code (l, k) is correlated with the received signal Y (l, k) to find the synchronization code that generates the current maximum correlation peak corresponding to the interference signal of the adjacent cell

(C) By the synchronization code of the cell The current maximum correlation peak corresponds to the synchronization code of the interference signal of the adjacent cell Determine the channel H _m0 (l,k) channel estimation of the interference signal of the adjacent cell corresponding to the current maximum correlation peak m0 represents the current maximum correlation peak.

(D) calculate That is, the estimate of the interference signal of the neighboring cell is eliminated from the synchronization signal received by the UE. The synchronization signal received by the UE is updated to the estimated synchronization signal after removing the interference signal of the adjacent cell, that is, the synchronization signal received by the UE at this time is equal to Y ₁ (l,k).

(E) Since the interference signal of the adjacent cell corresponding to the current maximum correlation peak has been eliminated, the Synchronization codes other than Y ₁ (l,k) are correlated to obtain the synchronization code of the interference signal of the adjacent cell corresponding to the current maximum correlation peak

The synchronization code of the current cell and the current maximum correlation peak correspond to the synchronization code of the interference signal of the adjacent cell Determine the channel estimation of the channel H _m1 (l,k) corresponding to the interference signal of the adjacent cell with the current maximum correlation peak

(F) calculation Estimates of interfering signals from adjacent cells are eliminated again. At this time, the synchronization signal received by the UE is equal to Y ₂ (l,k).

Repeat (D) to (F) calculations ${\hat{h}}_{\mathrm{mj}}(l,k),j=m2,\&Center\; Dot;\&Center\; Dot;\&Center\; Dot;\mathrm{mNsync}.$

The RSRP _mj of the neighboring cell mj can be obtained by the following formula:

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. the method determining Reference Signal Received Power, it is characterised in that described method includes:

A, the channel determining the interference signal of the corresponding adjacent cell of current maximum correlation peak in the synchronizing signal that user UE receives Estimate；

B, the channel by the interference signal of described adjacent cell estimate to obtain the valuation of the interference signal of described adjacent cell；

C, the valuation rejecting the interference signal of described adjacent cell in the synchronizing signal that UE receives, the synchronization receiving UE is believed It number is updated to reject the synchronizing signal after the valuation of the interference signal of described adjacent cell；

D, according to the channel estimation calculation of the interference signal of the adjacent cell determining in described step A the reference signal of adjacent cell Receive power RSRP；

E, redefine current maximal correlation in the synchronizing signal after the valuation of the interference signal rejecting described adjacent cell in step C The channel of the interference signal of the corresponding adjacent cell in peak is estimated.

2. determine the method for Reference Signal Received Power according to claim 1, it is characterised in that described receive at UE Synchronizing signal determining, the channel of the interference signal of the corresponding adjacent cell of current maximum correlation peak is estimated to include:

The label ID of this cell and adjacent cell ID is utilized to produce the synchronous code of this cell；

The synchronizing signal that the synchronous code of this cell and UE receive carries out related operation, determines that current maximum correlation peak is corresponding adjacent little The synchronous code of the interference signal in district；

The synchronous code of the synchronous code of this cell, the interference signal of the corresponding adjacent cell of current maximum correlation peak is determined current maximum phase The channel of the interference signal closing the corresponding adjacent cell in peak is estimated.

3. determine the method for Reference Signal Received Power according to claim 2, it is characterised in that described by described adjacent cell The channel of interference signal estimate that the valuation obtaining the interference signal of described adjacent cell includes:

The channel of the interference signal of described adjacent cell estimates that the product of the synchronous code of the interference signal with described adjacent cell is equal to institute State the valuation of the interference signal of adjacent cell.

4. determine the method for Reference Signal Received Power according to claim 1, it is characterised in that described receive at UE The valuation of the interference signal rejecting described adjacent cell in synchronizing signal includes: it is little that UE deducts described neighbour in the synchronizing signal receiving The valuation of the interference signal in district.

5. determine the method for Reference Signal Received Power according to claim 1, it is characterised in that described according to described step Described in the channel estimation calculation of the interference signal of the adjacent cell determining in A, the RSRP of adjacent cell includes:

RSRP=E (| | H | | of described adjacent cell²)-G, H is that the channel of the interference signal of the adjacent cell determining in described step A is estimated Meter,

E (x) is the expectation of x, and G is receiver gain.