CN104427520A - Adjacent region detection method under co-channel interference - Google Patents

Abstract

The invention provides an adjacent region detection method under the co-channel interference. Channel information of a serving cell is estimated by using a downlink reference signal, the channel information is multiplied by a local synchronous signal of the serving cell, and the multiplied signal is used as the interference item of a target cell and the interference item is removed from a received synchronous signal so as to obtain a synchronous receiving signal based on high interference elimination; synchronization and cell identifier detection are carried out on the target cell at the synchronous receiving signal, thereby detecting information of a certain adjacent cell with high power; channel estimation is carried out by using a downlink reference signal of the adjacent cell and the adjacent cell channel information is multiplied by a local synchronous signal to obtain interference information of the adjacent cell; the interference information is removed from a received mixed synchronous signal and cell information of a next adjacent cell is measured; and the operation is carried out continuously until N pieces of needed adjacent cell information is searched. Therefore, an adjacent cell detection method under the complex multi-cell co-channel interference circumstances is realized; and the monitoring capacity of the terminal for the surrounding is improved.

Description

Neighbor cell detecting method under co-channel interference

Technical field

The present invention relates to communication technique field, particularly relate to the neighbor cell detecting method under a kind of co-channel interference.

Background technology

In mobile communication system, first can complete cell initial searching process after UE start, to be attached in suitable Serving cell, progressively set up wireless communication procedure.UE also needs periodically to intercept peripheral cell information, to prepare for cell reselection and switching simultaneously.

The signal that adjacent area is detected can comprise co-channel interference component, because synchronizing signal is in frequency band centre position, cannot distinguish the co-channel interference from different districts.Usually, Cell searching preferentially can detect the cell information that signal is stronger, and the more weak community of signal often by other send the stronger community of signals disturb, cause terminal to be difficult to detect weak cell information, reduce the detection perform of detected community.

Especially for the PSC(primary synchronization code specified in LTE system, Primary Synchronisation Code) sequence only has three groups, ID(sector ID in identical group will inevitably be there is in peripheral two-layer adjacent area) co-channel interference, this is by too large for interference when causing the PSC information using identical group of ID to carry out cell synchronous, and accurately cannot obtain the sync bit of Target cell, and then accurately cannot obtain the cell ID of Target cell.

Joint channel estimation value and interfered cell channel estimation value is obtained by synchronizing signal in prior art, again these two signals are carried out interference cancellation to reach the object reducing co-channel interference, but, in prior art, the information of interfered cell obtains according to measured value of parameters given in Neighboring Cell List, and in fact Neighboring Cell List can not provide the RSRP(Reference Signal Receiving Power of concrete interfered cell, Reference Signal Received Power), RSRQ(ReferenceSignal Receiving Quality, Reference Signal Received Quality), SINR(Signal to Interference plus NoiseRatio, Signal to Interference plus Noise Ratio) constant power information, possible annex cell ID is just informed to terminal by Neighboring Cell List simultaneously, and terminal also needs to remove according to actual scene the neighboring BS information that do not provide in blind check Neighboring Cell List.By Neighboring Cell List, this determines that the scheme of interfered cell is difficult to realize with regard to making.

Summary of the invention

The invention provides the neighbor cell detecting method under a kind of co-channel interference, to realize adjacent district detecting method when complicated multiple cell co-channel interference, be subject to solve Target cell detection the problem that strong jamming affects hydraulic performance decline, promote terminal to the monitoring capability of surrounding enviroment.

For solving the problem, the invention provides the neighbor cell detecting method under a kind of co-channel interference, comprising:

A, UE estimate the channel information of Serving cell master sync signal according to descending reference information and the channel information of Serving cell auxiliary synchronous signals

B, make n=1;

The synchronizing information of c, reconstruct Target cell n $Y_{\mathrm{neighbor}\_n}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{neighbor}\_i}$ With $Y_{\mathrm{neighbor}\_n}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{neighbor}\_i},$ And by described synchronizing information Y _{neighbor_n}be converted to Domain Synchronous information y _{neighbor_n}, according to the Domain Synchronous information y of described Target cell n _{neighbor_n}carry out synchronously to this Target cell n, the group id of search Target cell n;

D, judge whether n is greater than N, if so, then process ends, otherwise estimate the channel information of the synchronizing signal of the described Target cell n of the synchronizing information for calculating next Target cell n+1 according to the descending reference information of described Target cell n and the channel information of Serving cell auxiliary synchronous signals n from adding, and returns step c;

Wherein, described Y ^pssfor the synchronous rear master sync signal received is set up in described UE and Serving cell, PSS _servefor the local master sync signal of Serving cell, be the channel information of i-th Target cell master sync signal, PSS _{neighbor_i}be the local master sync signal of i-th Target cell, Y ^sssfor the synchronous rear auxiliary synchronous signals received is set up in described UE and Serving cell, SSS _servefor the local auxiliary synchronous signals of Serving cell, be the channel information of i-th Target cell auxiliary synchronous signals, SSS _{neigbor_i}be i-th Target cell auxiliary synchronous signals, i is the natural number being less than or equal to n-1.

Further, UE estimates the channel information of the master sync signal of Serving cell or Target cell n according to descending reference information and the channel information of Serving cell auxiliary synchronous signals time, estimate channel information corresponding on channel information corresponding on master sync signal time-frequency location and auxiliary synchronous signals time-frequency location by interpolation method.

Adopt the neighbor cell detecting method under co-channel interference provided by the invention, downlink reference signal is utilized to estimate the channel information of Serving cell, the local synchronization signal multiplication that this channel information and Serving cell have been known, as the distracter to Target cell, in the mixed synchronization signal received, distracter is removed, obtain removing more strongly disturbing synchronous Received signal strength, the synchronous Received signal strength removing interference carries out synchronous and cell ID detection to Target cell, now can detect a certain neighboring BS information that power is stronger, utilize and detect that the downlink reference signal of this adjacent area carries out channel estimating, this channels of neighboring areas information and the local synchronization signal multiplication known are estimated to draw the interfere information of this adjacent area, the interfere information of this adjacent area is removed again in the mixed synchronization signal received, measure the cell information of next adjacent area again, by that analogy, until search out N number of neighboring BS information of needs, thus achieve adjacent district detecting method when complicated multiple cell co-channel interference, promote terminal to the monitoring capability of surrounding enviroment.

Accompanying drawing explanation

Fig. 1 is Serving cell and Target cell schematic layout pattern;

Fig. 2 is the neighbor cell detecting method schematic flow sheet under a kind of co-channel interference of the present invention.

Embodiment

In order to make object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.

The present invention realizes based on following consideration: for cell layout as shown in Figure 1, downlink reference signal is utilized to estimate the channel information of Serving cell, this channel information is less by the impact of co-channel interference, the local synchronization signal multiplication that this channel information and Serving cell have been known, as the distracter to Target cell, in the mixed synchronization signal received, distracter is removed, obtain removing more strongly disturbing synchronous Received signal strength, the synchronous Received signal strength removing interference carries out synchronous and cell ID detection to Target cell, now can detect Target cell 1 information that power is stronger, utilize and detect that the downlink reference signal of Target cell 1 carries out channel estimating, Target cell 1 channel information and the local synchronization signal multiplication known are estimated to draw the interfere information of Target cell 1, the interfere information of Target cell 1 is removed again in the mixed synchronization signal received, then the cell information of measurement target community 2.By that analogy, until search out N number of neighboring BS information of needs.

In the present invention, utilize the downlink reference signal specified in agreement to estimate descending channel information, as reference signals such as CRS, DM-RS, PRS, CSI-RS.Because different cell IDs can take different downlink resource positions, thus can effectively distinguish channel information from different communities, better filtering co-channel interference according to this type of downlink reference signal, promote the search performance of Target cell.

Concrete, UE completes search of initial zone, sets up synchronous with Serving cell, and obtains cell identity information; Wherein, the Domain Synchronous signal message of the multiple community of the mixing that UE receives is designated as y, and transforming to frequency domain is Y;

According to descending reference information, UE estimates that the channel information of this Serving cell synchronizing signal is well known to a person skilled in the art, owing to the time-frequency location of synchronizing signal not being placed any other reference signal information, thus must estimate channel information corresponding on channel information corresponding on master sync signal time-frequency location and auxiliary synchronous signals time-frequency location by interpolation method, concrete channel estimation methods repeats no more;

Reconstruct the reception information of Target cell 1 to be detected:

Frequency-domain received signal after the elimination Serving cell interference that master sync signal is corresponding is:

$Y_{\mathrm{neighbor}\_1}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}$

Frequency-domain received signal after the elimination Serving cell interference that auxiliary synchronous signals is corresponding is:

$Y_{\mathrm{neighbor}\_1}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{serve}}$

The frequency-domain received signal of service cell information will be eliminated transform to time domain, obtain new time domain and receive data y _{neighbor_1}, be the time-domain received signal of the Target cell 1 of reconstruct;

The information of search Target cell 1, given sector id information, according to y _{neighbor_1}target adjacent area 1 is carried out synchronously, and the relevant informations such as search groups id.

Similar above step, reconstructs the reception information of Target cell 2 to be detected

$Y_{\mathrm{neighbor}\_2}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}-H_{\mathrm{neighbor}\_1}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{neighbor}\_1}$

$Y_{\mathrm{neighbor}\_2}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{SSS}}_{\mathrm{serve}}-H_{\mathrm{neighbor}\_1}^{\mathrm{sss}}\·{\mathrm{SSS}}_{\mathrm{neighbor}\_1}$

The frequency-domain received signal of service cell information, Target cell 1 will be eliminated transform to time domain, obtain new time domain and receive data y _{neighbor_2}, be the time-domain received signal of the Target cell 2 of reconstruct.

The information of search Target cell 2, given sector id information, according to y _{neighbor_2}target adjacent area 2 is carried out synchronously, and the relevant informations such as search groups id.

By that analogy, the reception information of Target cell n is reconstructed

$Y_{\mathrm{neighbor}\_n}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{neighbor}\_i}$

$Y_{\mathrm{neighbor}\_n}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{neighbor}\_i}$

The frequency-domain received signal of service cell information, Target cell 1 ~ (n-1) will be eliminated transform to time domain, obtain new time domain and receive data y _{neighbor_n}, be the time-domain received signal of the Target cell 2 of reconstruct.

The information of search Target cell n, given sector id information, according to y _{neighbor_n}target adjacent area n is carried out synchronously, and the relevant informations such as search groups id.

Based on above-mentioned principle, the invention provides the neighbor cell detecting method under a kind of co-channel interference, as shown in Figure 2, comprising:

A, UE estimate the channel information of Serving cell master sync signal according to descending reference information and the channel information of Serving cell auxiliary synchronous signals

B, make n=1;

The synchronizing information of c, reconstruct Target cell n $Y_{\mathrm{neighbor}\_n}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{neighbor}\_i}$ With $Y_{\mathrm{neighbor}\_n}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{neighbor}\_i},$ And by described synchronizing information Y _{neighbor_n}be converted to Domain Synchronous information y _{neighbor_n}, according to the Domain Synchronous information y of described Target cell n _{neighbor_n}carry out synchronously to this Target cell n, the group id of search Target cell n;

D, judge whether n is greater than N, if so, then process ends, otherwise estimate the channel information of the synchronizing signal of the described Target cell n of the synchronizing information for calculating next Target cell n+1 according to the descending reference information of described Target cell n and the channel information of Serving cell auxiliary synchronous signals n from adding, and returns step c;

Wherein, described Y ^pssfor the synchronous rear master sync signal received is set up in described UE and Serving cell, PSS _servefor the local master sync signal of Serving cell, be the channel information of i-th Target cell master sync signal, PSS _{neighbor_i}be the local master sync signal of i-th Target cell, Y ^sssfor the synchronous rear auxiliary synchronous signals received is set up in described UE and Serving cell, SSS _servefor the local auxiliary synchronous signals of Serving cell, be the channel information of i-th Target cell auxiliary synchronous signals, SSS _{neigbor_i}be i-th Target cell auxiliary synchronous signals, i is the natural number being less than or equal to n-1.

Further, UE estimates the channel information of the master sync signal of Serving cell or Target cell n according to descending reference information and the channel information of Serving cell auxiliary synchronous signals time, estimate channel information corresponding on synchronizing signal time-frequency location by interpolation method.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (2)

1. the neighbor cell detecting method under co-channel interference, is characterized in that, comprising:

A, UE estimate the channel information of Serving cell master sync signal according to descending reference information and the channel information of Serving cell auxiliary synchronous signals

B, make n=1;

The synchronizing signal of c, reconstruct Target cell n,

$Y_{\mathrm{neighbor}\_n}^{\mathrm{pss}}=Y^{\mathrm{pss}}-H_{\mathrm{serve}}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{pss}}\·{\mathrm{PSS}}_{\mathrm{neighbor}\_i}$ With $Y_{\mathrm{neighbor}\_n}^{\mathrm{sss}}=Y^{\mathrm{sss}}-H_{\mathrm{serve}}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{serve}}-\underset{i=1}{\overset{n-1}{\mathrm{\Σ}}}{H}_{\mathrm{neighbor}\_i}^{\mathrm{sss}}\·{\mathrm{sss}}_{\mathrm{neighbor}\_i},$

And by described synchronizing signal Y _{neighbor_n}be converted to Domain Synchronous signal y _{neighbor_n}, according to the Domain Synchronous signal y of described Target cell n _{neighbor_n}carry out synchronously to this Target cell n, the group id of search Target cell n;

D, judge whether n is greater than N, if so, then process ends, otherwise estimate the channel information of the synchronizing signal of the described Target cell n of the synchronizing information for calculating next Target cell n+1 according to the descending reference information of described Target cell n and the channel information of Serving cell auxiliary synchronous signals n from adding, and returns step c;

Wherein, described Y ^pssfor the synchronous rear master sync signal received is set up in described UE and Serving cell, PSS _servefor the local master sync signal of Serving cell, be the channel information of i-th Target cell master sync signal, PSS _{neighbor_i}be the local master sync signal of i-th Target cell, Y ^sssfor the synchronous rear auxiliary synchronous signals received is set up in described UE and Serving cell, SSS _servefor the local auxiliary synchronous signals of Serving cell, be the channel information of i-th Target cell auxiliary synchronous signals, SSS _{neigbor_i}be i-th Target cell auxiliary synchronous signals, i is the natural number being less than or equal to n-1.

2. method according to claim 1, is characterized in that, UE estimates the channel information of the master sync signal of Serving cell or Target cell n according to descending reference information and the channel information of Serving cell auxiliary synchronous signals time, estimate channel information corresponding on channel information corresponding on master sync signal time-frequency location and auxiliary synchronous signals time-frequency location by interpolation method.