CN108243419B - Method and device for detecting same-frequency cells - Google Patents
Method and device for detecting same-frequency cells Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for detecting common-frequency cells, wherein the method comprises the following steps: determining candidate cells through signal detection; screening out false cells from the candidate cells according to the parameters corresponding to the candidate cells; and taking the remaining candidate cells in the candidate cells as target cells. According to the embodiment of the invention, the false cells are screened out from the candidate cells according to the parameters corresponding to the candidate cells, and the remaining candidate cells in the candidate cells are taken as the target cells, so that the interference of the false cells can be eliminated, the measurement power consumption is reduced while the detection performance of the weak cells is not influenced, and the mobility performance of the terminal is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for detecting a common-frequency cell.
Background
When co-frequency detection is performed in an LTE (Long Term Evolution) system, the detection of a target cell may be interfered by other cells. Especially in TDD-LTE system, quasi-Synchronization of all co-frequency cells causes PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) to overlap each other frequently. When the target cell is detected, the correlation process generates a plurality of false correlation peaks due to the existence of other cells. When other cells are stronger than the target cell by more than 10dB, a phenomenon that the correlation detection values of a large number of false cells caused by the strong cells are higher than the correlation detection values of the target cell often occurs.
It is considered that the number of co-frequency cells specified in the protocol is up to 32, and the target cell is frequently scheduled in the order of the strength of the correlation values when the measurement scheduling is performed on the target cell. If the false cells generated by strong cell interference are not suppressed, it is likely that the correlation values of the target cells are ranked too late to be ranked in the list of the co-frequency cells, or the scheduling priority is too low to schedule the measurement in time. These may cause reselection or handover failures, which affect the mobility performance of the terminal.
In view of the above problems, the existing solutions mainly mitigate the influence of the false cell in two aspects. Firstly, by improving the frequency of the same-frequency measurement scheduling, shortening the period of the same-frequency measurement scheduling and scheduling the detected candidate cells as much as possible in each measurement period; secondly, a concept of the survival time is introduced, a certain cell needs to be continued for a certain period of the survival time after the first detection, namely the cell needs to be detected in the next detection, otherwise, the cell is deleted.
However, both of these approaches have significant disadvantages, and in the first approach, an increase in scheduling inevitably increases power consumption, which is very disadvantageous for the mobile device. In the second method, if the target cell is weak, it cannot be guaranteed that each detection can be successful, and a scheduling failure condition also occurs.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting a same-frequency cell, which can reduce the measurement power consumption and improve the mobility of a terminal without influencing the detection performance of a weak cell.
In a first aspect, an embodiment of the present invention provides a method for detecting a co-frequency cell, including:
determining candidate cells through signal detection;
screening out false cells from the candidate cells according to the parameters corresponding to the candidate cells;
and taking the remaining candidate cells in the candidate cells as target cells.
In a second aspect, an embodiment of the present invention further provides an apparatus for detecting a co-frequency cell, including:
a candidate cell determination module for determining candidate cells through signal detection;
the false cell determining module is used for screening false cells from the candidate cells according to the parameters corresponding to the candidate cells;
and the target cell determining module is used for taking the remaining candidate cells in the candidate cells as target cells.
According to the embodiment of the invention, the false cells are screened out from the candidate cells according to the parameters corresponding to the candidate cells, and the remaining candidate cells in the candidate cells are taken as the target cells, so that the interference of the false cells can be eliminated, the measurement power consumption is reduced while the detection performance of the weak cells is not influenced, and the mobility performance of the terminal is improved.
Drawings
Fig. 1 is a flowchart of a method for detecting a co-frequency cell in a first embodiment of the present invention;
fig. 2A is a flowchart of a method for detecting a co-frequency cell according to a second embodiment of the present invention;
fig. 2B is a diagram illustrating PSS and SSS frame structures of TDD-LTE according to a second embodiment of the present invention;
fig. 2C is a schematic diagram of a subcarrier data mapping rule of an SSS according to a second embodiment of the present invention;
fig. 3 is a structural diagram of an apparatus for detecting a co-frequency cell in a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for detecting a co-frequency cell according to an embodiment of the present invention, and this embodiment is applicable to a situation of detecting a co-frequency cell. The method can be executed by the same-frequency cell detection device provided by the embodiment of the invention, and the device can be realized in a software and/or hardware mode. The device can be made into an application program installed in the terminal. As shown in fig. 1, the method specifically includes:
and S110, determining candidate cells through signal detection.
Wherein the number of candidate cells is at least one.
Specifically, a cell having a signal strength exceeding a preset strength may be used as the candidate cell. The candidate cells not only contain target cells for same-frequency detection, but also contain interference cells. The number of target cells detected in the same frequency can be up to 32 according to the 3 GPP-LTE-36.211 protocol.
And S120, screening out false cells from the candidate cells according to the parameters corresponding to the candidate cells.
S130, taking the remaining candidate cells in the candidate cells as target cells.
Specifically, whether each candidate cell is a false cell can be determined according to the parameters. If the cell is a dummy cell, the dummy cell can be deleted from the candidate cells or marked. And when in subsequent scheduling processing, the scheduling processing is not carried out on the false cell.
In the embodiment, the false cells are screened out from the candidate cells according to the parameters corresponding to the candidate cells, and the remaining candidate cells in the candidate cells are used as the target cells, so that the interference of the false cells can be eliminated, the measurement power consumption is reduced while the detection performance of the weak cells is not influenced, and the mobility performance of the terminal is improved.
On the basis of the foregoing embodiments, the determining candidate cells through signal detection includes:
the SSS candidate cell is determined by detecting a secondary synchronization signal SSS.
The SSS candidate cells are cells containing SSS, the number of the SSS candidate cells is at least 1, and the SSS candidate cells can contain target cells and/or interference cells.
On the basis of the above embodiment, the screening false cells from the candidate cells according to the parameters corresponding to the candidate cells includes:
determining cell grouping identification corresponding to each SSS candidate cell;
determining corresponding parameters according to the cell grouping identification;
and screening out false cells from the SSS candidate cells according to the corresponding parameters.
On the basis of the above embodiment, the determining the corresponding parameter according to the cell grouping identifier includes:
inquiring a pre-established grouping identification and parameter corresponding relation list according to the cell grouping identification;
and inquiring the corresponding parameters of the cell grouping identification from the corresponding relation list.
On the basis of the embodiment, the parameters are intermediate variables m0 and m1 of an SSS generation formula specified by a 3GPP-LTE _36.211 protocol; the corresponding relation list is a group identifier specified by the 3 GPP-LTE-36.211 protocol
And m0 and m 1.
On the basis of the foregoing embodiment, the screening false cells from the SSS candidate cells according to the corresponding parameter includes:
determining a strongest SSS candidate cell of the SSS candidate cells;
if the SSS candidate cell meets any one of the following conditions, determining that the SSS candidate cell is a false cell:
(1) the SSS candidate cell and the strongest SSS candidate cell are both on TTI0, and m0 of the SSS candidate cell and m0 of the strongest SSS candidate cell are the same and m1 is different;
(2) the SSS candidate cell and the strongest SSS candidate cell are both on TTI5, and m1 of the SSS candidate cell and m1 of the strongest SSS candidate cell are the same and m0 is different;
(3) the SSS candidate cell is located on TTI5, the strongest SSS candidate cell is located on TTI0, and m1 of the SSS candidate cell is the same as m0 of the strongest SSS candidate cell;
(4) the SSS candidate cell is located on TTI0, the strongest SSS candidate cell is located on TTI5, and m0 of the SSS candidate cell is the same as m1 of the strongest SSS candidate cell.
On the basis of the foregoing embodiment, if the SSS candidate cell satisfies any one of the following conditions, determining that the SSS candidate cell is a false cell includes:
if the SSS candidate cell meets any one of the following conditions, determining the SSS candidate cell as a candidate false cell;
and comparing the energy value of the candidate false cell with a preset threshold, if the energy value is lower than the preset threshold, determining the candidate false cell as a false cell, and setting a false flag bit for the false cell.
On the basis of the foregoing embodiment, the preset threshold is obtained by subtracting a preset value from the energy value of the strongest SSS candidate cell.
On the basis of the above embodiment, the preset value is 6 dB.
In the embodiment, the false cells are screened from the candidate cells according to the parameters corresponding to the candidate cells, and the remaining candidate cells in the candidate cells are used as the target cells, so that the interference of the false cells can be eliminated, the measurement power consumption is reduced while the detection performance of the weak cells is not influenced, and the mobility performance of the terminal is improved.
Example two
Fig. 2A is a flowchart of a method for detecting cells with the same frequency according to a second embodiment of the present invention, and this embodiment uses SSS signal detection as an example to describe in detail implementation of the present invention. The downlink synchronization signal of LTE is composed of primary synchronization signals PSS and SSS, where the PSS and SSS frame structure of TDD-LTE is shown in fig. 2B. The SSS is generated in different modes on odd subcarriers and even subcarriers, and the SSS sequence is formed by the SSS sequence on the odd subcarriers of TTI0/5
And m0Determining; on even subcarriers of TTI0/5, the SSS sequence consists of
m0And m1Co-determination of where m0And m1According to the 3 GPP-LTE-36.211 protocol
And (5) looking up the table to obtain the numerical value. The subcarrier data mapping rule of SSS is shown in fig. 2C. As can be seen from the introduction of the 3 GPP-LTE-36.211 protocol 6.11.2 section
At the same time, the SSS has no uniqueness on the sequence of the odd number subcarriers, namely, two cells with the same frequency even if
In contrast, the SSS sequences may be identical on odd subcarriers, resulting in false detection during SSS detection. The SSS false detection situation includes the following two cases:
(1) when a real SSS sequence is located on TTI0, one or more dummy cells may be generated on TTI0, with m0 of the dummy cells being the same as m0 of the real cell but m1 being different; one or more dummy cells may also be generated at TTI5, with m1 being the same as m0 of the real cell.
(2) When a real SSS sequence is located on TTI5, one or more dummy cells may be generated on TTI5, with m1 of the dummy cells being the same as m1 of the real cell but m0 being different; one or more dummy cells may also be generated at TTI0, with m0 being the same as m1 of the real cell.
Aiming at the possible SSS false cell condition described above, the scheme proposed by the patent method firstly screens out the candidate cells related to SSS according to the candidate cells
The m0 and m1 values are obtained by table lookup and compared with m0 and m1 of the strongest candidate cell, and if the two cases are described above, the comparison with a specific threshold is needed to judge whether the cell belongs to a false cell. In this way, the interference of the false cell in the SSS detection process can be effectively inhibited.
Wherein, the cell ID of LTE is recorded as
There are 504 values, 0,1,2, …, 503. According to the specifications of the 3 GPP-LTE-36.211 protocol,
that is to say, the
The number of the groups was divided into 168, 3 values each,
which indicates which group is located in which group,
the value range is {0,1,2, …, 167 }.
Indicating which value is located within the group,
the value range of (a) is {0,1,2 }.
The value of (b) is obtained by PSS detection;
the value of (d) is determined by SSS. m0 and m1 are intermediate variables of the SSS generation formula specified by the 3 GPP-LTE-36.211 protocol. Specifically, as shown in fig. 2A, the method of this embodiment includes:
s210, SSS candidate cells are determined by detecting an auxiliary synchronization signal SSS.
S220, determining cell grouping identification corresponding to each SSS candidate cell
S230, according to the cell grouping identification
Inquiring a pre-established grouping identification and parameter corresponding relation list, and inquiring the cell grouping identification from the corresponding relation list
Corresponding parameters m0 and m 1.
The available correspondence list is shown in the following table one:
S240, screening out false cells from the SSS candidate cells according to the corresponding parameters m0 and m 1.
Specifically, determining a strongest SSS candidate cell among the SSS candidate cells; determining that the SSS candidate cell is a false cell if the SSS candidate cell satisfies any one of the following conditions:
(1) the SSS candidate cell and the strongest SSS candidate cell are both on TTI0, and m0 of the SSS candidate cell and m0 of the strongest SSS candidate cell are the same and m1 is different;
(2) the SSS candidate cell and the strongest SSS candidate cell are both on TTI5, and m1 of the SSS candidate cell and m1 of the strongest SSS candidate cell are the same and m0 is different;
(3) the SSS candidate cell is located on TTI5, the strongest SSS candidate cell is located on TTI0, and m1 of the SSS candidate cell is the same as m0 of the strongest SSS candidate cell;
(4) the SSS candidate cell is located on TTI0, the strongest SSS candidate cell is located on TTI5, and m0 of the SSS candidate cell is the same as m1 of the strongest SSS candidate cell.
And further comparing the energy value of the candidate false cell with a preset threshold, if the energy value is lower than the preset threshold, determining the candidate false cell as a false cell, and setting a false flag bit for the false cell. Wherein the preset threshold is the energy value of the strongest SSS candidate cell minus 6 dB.
And S250, taking the remaining candidate cells in the SSS candidate cells as target cells.
In the embodiment, the false cells are screened out from the candidate cells according to the parameters corresponding to the candidate cells, and the remaining candidate cells in the candidate cells are used as the target cells, so that the interference of the false cells can be eliminated, the measurement power consumption is reduced while the detection performance of the weak cells is not influenced, and the mobility performance of the terminal is improved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an apparatus for detecting a co-frequency cell according to a fifth embodiment of the present invention. The embodiment is suitable for the situation of same-frequency cell detection. The apparatus can be implemented in software and/or hardware. The device can be made into an application program installed in the terminal. As shown in fig. 3, the method specifically includes: a candidate cell determination module 31, a dummy cell determination module 32 and a target cell determination module 33.
The candidate cell determining module 31 is configured to determine candidate cells through signal detection;
the false cell determining module 32 is configured to screen a false cell from the candidate cells according to the parameter corresponding to each candidate cell;
the target cell determining module 33 is configured to use the remaining candidate cells of the candidate cells as target cells.
On the basis of the foregoing embodiment, the candidate cell determining module 31 is specifically configured to:
the SSS candidate cell is determined by detecting a secondary synchronization signal SSS.
On the basis of the above embodiment, the fake cell determination module 32 includes: a packet identifier determining unit 321, a parameter determining unit 322, and a fake cell determining unit 323.
The group identifier determining unit 321 is configured to determine a cell group identifier corresponding to each SSS candidate cell;
the parameter determining unit 322 is configured to determine a corresponding parameter according to the cell grouping identifier;
the false cell determining unit 323 is configured to screen a false cell from the SSS candidate cells according to the corresponding parameter.
On the basis of the foregoing embodiment, the parameter determining unit 322 is specifically configured to:
inquiring a pre-established grouping identification and parameter corresponding relation list according to the cell grouping identification; and inquiring the corresponding parameters of the cell grouping identification from the corresponding relation list.
On the basis of the embodiment, the parameters are intermediate variables m0 and m1 of an SSS generation formula specified by a 3GPP-LTE _36.211 protocol; the corresponding relation list is a group identifier specified by the 3 GPP-LTE-36.211 protocol
And m0 and m 1.
On the basis of the foregoing embodiment, the fake cell determining unit 323 is specifically configured to:
determining a strongest SSS candidate cell of the SSS candidate cells;
if the SSS candidate cell meets any one of the following conditions, determining that the SSS candidate cell is a false cell:
(1) the SSS candidate cell and the strongest SSS candidate cell are both on TTI0, and m0 of the SSS candidate cell and m0 of the strongest SSS candidate cell are the same and m1 is different;
(2) the SSS candidate cell and the strongest SSS candidate cell are both on TTI5, and m1 of the SSS candidate cell and m1 of the strongest SSS candidate cell are the same and m0 is different;
(3) the SSS candidate cell is located on TTI5, the strongest SSS candidate cell is located on TTI0, and m1 of the SSS candidate cell is the same as m0 of the strongest SSS candidate cell;
(4) the SSS candidate cell is located on TTI0, the strongest SSS candidate cell is located on TTI5, and m0 of the SSS candidate cell is the same as m1 of the strongest SSS candidate cell.
On the basis of the foregoing embodiment, the fake cell determining unit 323 is specifically configured to:
if the SSS candidate cell meets any one of the following conditions, determining the SSS candidate cell as a candidate false cell; and comparing the energy value of the candidate false cell with a preset threshold, if the energy value is lower than the preset threshold, determining the candidate false cell as a false cell, and setting a false flag bit for the false cell.
On the basis of the foregoing embodiment, the preset threshold is obtained by subtracting a preset value from the energy value of the strongest SSS candidate cell.
On the basis of the above embodiment, the preset value is 6 dB.
The device for detecting the same-frequency cells provided by the embodiment can execute the method for detecting the same-frequency cells provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the method. For details of the technology that are not described in detail in the above embodiments, reference may be made to the intra-frequency cell detection method provided in any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A method for detecting a common-frequency cell is characterized by comprising the following steps:
determining candidate cells through signal detection; the determining candidate cells through signal detection comprises: determining an SSS candidate cell by detecting an auxiliary synchronization signal SSS;
screening out false cells from the candidate cells according to the parameters corresponding to the candidate cells; the screening of the false cells from the candidate cells according to the parameters corresponding to the candidate cells comprises: determining cell grouping identification corresponding to each SSS candidate cell; determining corresponding parameters according to the cell grouping identification; screening out false cells from the SSS candidate cells according to the corresponding parameters; the screening false cells from the SSS candidate cells according to the corresponding parameters comprises:
determining a strongest SSS candidate cell of the SSS candidate cells;
if the SSS candidate cell meets any one of the following conditions, determining that the SSS candidate cell is a false cell:
(1) the SSS candidate cell and the strongest SSS candidate cell are both on TTI0, and m0 of the SSS candidate cell and m0 of the strongest SSS candidate cell are the same and m1 is different;
(2) the SSS candidate cell and the strongest SSS candidate cell are both on TTI5, and m1 of the SSS candidate cell and m1 of the strongest SSS candidate cell are the same and m0 is different;
(3) the SSS candidate cell is located on TTI5, the strongest SSS candidate cell is located on TTI0, and m1 of the SSS candidate cell is the same as m0 of the strongest SSS candidate cell;
(4) the SSS candidate cell is located on TTI0, the strongest SSS candidate cell is located on TTI5, and m0 of the SSS candidate cell is the same as m1 of the strongest SSS candidate cell;
and taking the remaining candidate cells in the candidate cells as target cells.
2. The method of claim 1, wherein the determining the corresponding parameter according to the cell grouping identity comprises:
inquiring a pre-established grouping identification and parameter corresponding relation list according to the cell grouping identification;
and inquiring the corresponding parameters of the cell grouping identification from the corresponding relation list.
3. The method of claim 2, wherein the parameters are intermediate variables m0 and m1 of SSS generation formula specified in 3GPP-LTE _36.211 protocol; the corresponding relation list is a group identifier specified by the 3 GPP-LTE-36.211 protocol
And m0 and m 1.
4. The method of claim 1, wherein determining the SSS candidate cell as a false cell if the SSS candidate cell satisfies any one of the following conditions comprises:
if the SSS candidate cell meets any one of the following conditions, determining the SSS candidate cell as a candidate false cell;
and comparing the energy value of the candidate false cell with a preset threshold, if the energy value is lower than the preset threshold, determining the candidate false cell as a false cell, and setting a false flag bit for the false cell.
5. The method of claim 4, wherein the predetermined threshold is an energy value of the strongest SSS candidate cell minus a predetermined value.
6. The method of claim 5, wherein the predetermined value is 6 dB.
7. An apparatus for detecting a cell with a same frequency, comprising:
a candidate cell determination module for determining candidate cells through signal detection; the candidate cell determination module is specifically configured to: determining an SSS candidate cell by detecting an auxiliary synchronization signal SSS;
the false cell determining module is used for screening false cells from the candidate cells according to the parameters corresponding to the candidate cells; the fake cell determination module comprises: a grouping identifier determining unit, configured to determine a cell grouping identifier corresponding to each SSS candidate cell; a parameter determining unit, configured to determine a corresponding parameter according to the cell grouping identifier; a false cell determining unit, configured to screen a false cell from the SSS candidate cells according to the corresponding parameter; the false cell determination unit is specifically configured to:
determining a strongest SSS candidate cell of the SSS candidate cells;
if the SSS candidate cell meets any one of the following conditions, determining that the SSS candidate cell is a false cell:
(1) the SSS candidate cell and the strongest SSS candidate cell are both on TTI0, and m0 of the SSS candidate cell and m0 of the strongest SSS candidate cell are the same and m1 is different;
(2) the SSS candidate cell and the strongest SSS candidate cell are both on TTI5, and m1 of the SSS candidate cell and m1 of the strongest SSS candidate cell are the same and m0 is different;
(3) the SSS candidate cell is located on TTI5, the strongest SSS candidate cell is located on TTI0, and m1 of the SSS candidate cell is the same as m0 of the strongest SSS candidate cell;
(4) the SSS candidate cell is located on TTI0, the strongest SSS candidate cell is located on TTI5, and m0 of the SSS candidate cell is the same as m1 of the strongest SSS candidate cell;
and the target cell determining module is used for taking the remaining candidate cells in the candidate cells as target cells.
8. The apparatus according to claim 7, wherein the parameter determining unit is specifically configured to:
inquiring a pre-established grouping identification and parameter corresponding relation list according to the cell grouping identification; and inquiring the corresponding parameters of the cell grouping identification from the corresponding relation list.
9. The apparatus of claim 8, wherein the parameters are intermediate variables m0 and m1 of an SSS generation formula specified by a 3 GPP-LTE-36.211 protocol; the corresponding relation list is a group identifier specified by the 3 GPP-LTE-36.211 protocol
And m0 and m 1.
10. The apparatus according to claim 7, wherein the dummy cell determining unit is specifically configured to:
if the SSS candidate cell meets any one of the following conditions, determining the SSS candidate cell as a candidate false cell; and comparing the energy value of the candidate false cell with a preset threshold, if the energy value is lower than the preset threshold, determining the candidate false cell as a false cell, and setting a false flag bit for the false cell.
11. The apparatus of claim 10, wherein the predetermined threshold is an energy value of the strongest SSS candidate cell minus a predetermined value.
12. The apparatus of claim 11, wherein the predetermined value is 6 dB.
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