CN103813351A - Community measuring method and device - Google Patents
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Abstract
The invention discloses a community measuring method and device, and relates to the wireless communication field; the method comprises the steps of: determining a down symbol of a reference community according to configure parameters of the reference community; determining a down symbol of an adjacent community according to configure parameters of the adjacent community; determining CRS of the adjacent community in a time domain intersection portion of the down symbol of the adjacent community and the down symbol of the reference community; carrying out community measurement in a first frequency domain scope according to the CRS of the adjacent community, wherein the first frequency domain scope is the smaller system band width from the system band width of the adjacent community and the system band width of the reference community, or the first frequency domain scope is a smallest center band width of the system. By employing the scheme, the community measuring device can determine a measuring symbol of the adjacent community in the time domain scope of the reference community according to the system configure parameters, and can carry out community measurement to the measuring symbol in certain frequency domain scope, thereby completing measurement under different community time delay, and the method and device are suitable for the communication system of a time frequency two dimension resource distribution mode, such as an LTE system.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a cell measurement method and apparatus.
Background
The development of mobile communication has been excessive from the initial voice service to the voice service plus the data service, and the development of the data service presents a remarkable acceleration state, and more users join the third generation mobile communication (3G for short) system network. Users have higher requirements for mobile data experience, and the transmission capability of the 3G system has gradually become insufficient, so that a Long Term Evolution (Long Term Evolution, LTE for short) system of the 3G system is in the process of operation.
The LTE improves and enhances the 3G air access technology, and adopts Orthogonal Frequency Division Multiplexing (OFDM for short) and Multiple-Input Multiple-Output (MIMO for short) as the wireless network evolution standard, and designs the highest downlink rate of 100Mbps (bits per second) and the uplink rate of 50 Mbps. The LTE technology will greatly improve the user experience with mobile communication services, bringing more technical and cost advantages to operators. Meanwhile, the emergence of LTE technology has consolidated the dominance of conventional cellular mobile technology.
In a wireless mobile communication system, seamless mobility of user equipment (UE for short) is a main feature. The states of the UE in the network are mainly classified into an idle state and a connected state, and thus mobility management of the UE is mainly classified into mobility management in the idle state and mobility management in the connected state. The movement in the idle state is mainly realized by cell reselection, and the UE autonomously performs; the movement in the connected state is mainly realized by switching and is controlled by an evolved node b (eNodeB for short). An important basis for cell reselection and cell handover is the measurement results of the UE on the serving cell and the neighboring cells, and therefore the measurement is crucial for realizing seamless UE movement.
However, the LTE protocol only specifies the accuracy requirement to be met by the measurement, and does not specify a related measurement method, and LTE adopts a time-frequency two-dimensional resource allocation manner, and cannot refer to the previous measurement method.
Disclosure of Invention
The embodiment of the invention aims to solve the technical problem that: a cell measurement method and device suitable for a time-frequency two-dimensional resource allocation mode are provided.
According to an aspect of the embodiments of the present invention, a cell measurement method is provided, including:
determining a downlink symbol of a reference cell according to the configuration parameters of the reference cell; determining a downlink symbol of the adjacent cell according to the configuration parameters of the adjacent cell; determining a cell-specific reference signal (CRS) of a neighboring cell in a time domain intersection part of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell; according to the CRS of the adjacent cell, cell measurement is carried out in a first frequency domain range, wherein the first frequency domain range is the smaller system bandwidth of the adjacent cell and the system bandwidth of the reference cell, or the first frequency domain range is the minimum central bandwidth of the system.
As an exemplary implementation manner, the method may further obtain configuration parameters of the reference cell, where the configuration parameters of the reference cell include a cyclic prefix pattern obtained after synchronization of the reference cell, and an uplink and downlink configuration pattern, a special subframe pattern, and a system bandwidth obtained from system information of the reference cell; and acquiring configuration parameters of the neighboring cell, wherein the configuration parameters of the neighboring cell comprise a cyclic prefix mode acquired after the neighboring cell is searched, time delay relative to a reference cell, and an uplink and downlink configuration mode, a special subframe mode and a system bandwidth acquired from system information of the neighboring cell.
As an exemplary implementation manner, the step of determining a cell-specific reference signal CRS of a neighboring cell in a time domain intersection part of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell specifically includes: determining a time domain intersection part of a downlink symbol of the adjacent cell and a downlink symbol of the reference cell according to the time delay of the adjacent cell relative to the reference cell; according to a cyclic prefix mode of an adjacent cell, determining a CRS in a downlink subframe of the adjacent cell in a delay intersection part; and determining the CRS in the special subframe of the adjacent cell in the delay intersection part according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
As an exemplary implementation manner, the step of determining the downlink symbol of the reference cell according to the configuration parameter of the reference cell specifically includes: determining a downlink subframe and a special subframe of a reference cell according to an uplink and downlink configuration mode of the reference cell; determining a downlink symbol in a special subframe of a reference cell according to a special subframe mode and a cyclic prefix mode of the reference cell; the downlink symbols of the reference cell comprise all symbols of a downlink subframe and downlink symbols in a special subframe.
As an exemplary implementation manner, the step of determining the downlink symbol of the neighboring cell according to the configuration parameter of the neighboring cell specifically includes: determining a downlink subframe and a special subframe of the adjacent cell according to the uplink and downlink configuration mode of the adjacent cell; determining downlink symbols in special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell; the downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe.
As an exemplary implementation manner, the step of performing cell measurement in the first frequency domain according to the CRS of the neighboring cell specifically includes: performing linear average on the power of the CRS of the adjacent cell in a first frequency domain range to obtain the Reference Signal Received Power (RSRP) of the adjacent cell; or, performing linear average on the power of the symbols with the CRS of the neighboring cell in the first frequency domain range to obtain the RSSI for the received signal strength indication of the carrier of the neighboring cell.
As an exemplary embodiment, further comprising: determining a CRS in a downlink subframe of a reference cell according to a cyclic prefix mode of the reference cell; determining CRS in the special subframe of the reference cell according to the special subframe mode and the cyclic prefix mode of the reference cell; and according to the CRS of the reference cell, carrying out cell measurement in a second frequency domain range, wherein the second frequency domain range is the system bandwidth of the reference cell, or the second frequency domain range is the minimum central bandwidth of the system.
As an exemplary implementation manner, the step of performing cell measurement in the second frequency domain according to the CRS of the reference cell specifically includes: performing linear average on the power of the CRS of the reference cell in a second frequency domain range to obtain the RSRP of the reference cell; or, performing linear average on the power of the symbols with the CRS of the reference cell in the second frequency domain range to obtain the RSSI of the reference cell.
According to still another aspect of the embodiments of the present invention, there is provided a cell measurement apparatus, including:
a reference cell downlink symbol determining unit, configured to determine a downlink symbol of a reference cell according to a configuration parameter of the reference cell; a downlink symbol determining unit of the neighboring cell, configured to determine a downlink symbol of the neighboring cell according to the configuration parameter of the neighboring cell; a reference signal determining unit, configured to determine a cell-specific reference signal CRS of a neighboring cell in a time domain intersection part of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell; and a cell measurement unit, configured to perform cell measurement in a first frequency domain range according to the CRS of the neighboring cell, where the first frequency domain range is a smaller system bandwidth of the neighboring cell and the system bandwidth of the reference cell, or the first frequency domain range is a central bandwidth of a minimum system.
As an exemplary embodiment, further comprising: a configuration parameter obtaining unit, configured to obtain configuration parameters of a reference cell, where the configuration parameters of the reference cell include a cyclic prefix mode obtained after synchronization of the reference cell, and an uplink and downlink configuration mode, a special subframe mode, and a system bandwidth obtained from system information of the reference cell; and acquiring configuration parameters of the neighboring cell, wherein the configuration parameters of the neighboring cell comprise a cyclic prefix mode acquired after the neighboring cell is searched, time delay relative to a reference cell, and an uplink and downlink configuration mode, a special subframe mode and a system bandwidth acquired from system information of the neighboring cell.
As an exemplary embodiment, the reference signal determination unit includes: a reference downlink symbol intersection determining subunit, configured to determine, according to a time delay between the neighboring cell and the reference cell, a time domain intersection part of the downlink symbol of the neighboring cell and the downlink symbol of the reference cell; the adjacent cell reference signal determining subunit is used for determining the CRS in the downlink subframe of the adjacent cell in the delay intersection part according to the cyclic prefix mode of the adjacent cell; and determining the CRS in the special subframe of the adjacent cell in the delay intersection part according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
As an exemplary implementation manner, the reference cell downlink symbol determining unit is specifically configured to determine a downlink subframe and a special subframe of a reference cell according to an uplink and downlink configuration mode of the reference cell; determining a downlink symbol in a special subframe of a reference cell according to a special subframe mode and a cyclic prefix mode of the reference cell; the downlink symbols of the reference cell comprise all symbols of a downlink subframe and downlink symbols in a special subframe.
As an exemplary implementation manner, the neighboring cell downlink symbol determining unit is specifically configured to determine a downlink subframe and a special subframe of a neighboring cell according to an uplink and downlink configuration mode of the neighboring cell; determining downlink symbols in special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell; the downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe.
As an exemplary implementation manner, the cell measurement unit is specifically configured to perform linear average on power of CRSs of neighboring cells in a first frequency domain range to obtain RSRP of the neighboring cells; or, performing linear average on the power of the symbols with the CRS of the neighboring cell in the first frequency domain range to obtain the RSSI of the neighboring cell.
As an exemplary embodiment, the reference signal determining unit is further configured to determine a CRS in a downlink subframe of a reference cell according to a cyclic prefix pattern of the reference cell; determining CRS in the special subframe of the reference cell according to the special subframe mode and the cyclic prefix mode of the reference cell; the cell measurement unit is further configured to perform cell measurement in a second frequency domain range according to the CRS of the reference cell, where the second frequency domain range is a system bandwidth of the reference cell, or the second frequency domain range is a minimum central bandwidth of the system.
Based on the cell measurement scheme provided by the invention, the cell measurement device can determine the measurement symbols of the adjacent cells in the time domain range of the reference cell according to the system configuration parameters and carry out cell measurement on the measurement symbols in a certain frequency domain range, thereby completing measurement in different cell time delays.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a flow chart of an exemplary embodiment of the cell measurement method of the present invention.
Fig. 2 shows a schematic flow chart of another exemplary embodiment of the cell measurement method of the present invention.
Fig. 3 shows a schematic flow chart of a further exemplary embodiment of the cell measurement method of the present invention.
Fig. 4 shows a schematic diagram of uplink and downlink subframe allocation of subframes 0 to 9 in reference cell mode 1 according to the present invention.
Fig. 5 shows a schematic diagram of uplink and downlink subframe allocation of subframes 9 to 8 in reference cell mode 1 according to the present invention.
Fig. 6 shows a schematic diagram of uplink and downlink subframe allocation and time delay relationship of an exemplary reference cell and its neighboring cells according to the present invention.
Fig. 7 is a schematic structural diagram of an exemplary embodiment of the cell measurement apparatus of the present invention.
Fig. 8 is a schematic structural diagram of another exemplary embodiment of the cell measurement apparatus of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
In the present invention, because different cells on the same frequency point may have different system time and system bandwidth, and one frequency point may receive with the system time and system bandwidth of one cell, the cell serving as the reception reference is referred to as a reference cell in the present invention, and the reference cell may be, for example, a serving cell.
Fig. 1 shows a flow chart of an exemplary embodiment of the cell measurement method of the present invention. As shown in fig. 1, the method of the embodiment may be performed by a cell measurement device, which may be, for example, various mobile terminals, etc., but is not limited thereto. The method specifically comprises the following steps:
s102, determining the downlink symbol of the reference cell according to the configuration parameter of the reference cell.
The configuration parameters of the reference cell may include, for example, a cell identifier, a cyclic prefix mode, an uplink and downlink configuration mode, a special subframe mode, a system bandwidth, and the like of the reference cell, but are not limited thereto. The cell identity and cyclic prefix pattern of the reference cell may be obtained after synchronization of the reference cell. The uplink and downlink configuration mode, the special subframe mode, and the System bandwidth may be obtained from System information of the reference cell, for example, may be obtained from a Master Information Block (MIB) and a System Information Block (SIB) of the reference cell.
The downlink symbols of the reference cell include all symbols of its downlink subframe and downlink symbols in its special subframe. As an exemplary method for determining downlink symbols of a reference cell:
first, a downlink subframe and a special subframe of a reference cell may be determined according to an uplink and downlink configuration mode of the reference cell, for example, referring to an uplink and downlink configuration table shown in table 1, there are 7 uplink and downlink configuration modes, each of which specifies a corresponding relationship between a subframe number and a subframe type transmitted by the subframe number, where the subframe type includes an uplink subframe (denoted by U), a downlink subframe (denoted by D), and a special subframe (denoted by S).
Table 1 uplink and downlink configuration table
Then, the Downlink symbols in the special subframe of the reference cell may be determined according to the special subframe pattern and the cyclic prefix pattern of the reference cell, for example, see the special subframe configuration table shown in table 2, there are 9 special subframe configuration patterns, each of which specifies the number of Downlink Pilot Time slots (DwPTS) in different cyclic prefix patterns, that is, DwPTS. In addition, in addition to the DwPTS, the special subframe further includes an Uplink Pilot Time Slot (UpPTS for short) and a guard period (GP for short).
Table 2 special subframe configuration table
And S104, determining the downlink symbol of the adjacent cell according to the configuration parameters of the adjacent cell.
The configuration parameters of the neighboring cell may include, for example, a cell identifier of the neighboring cell, a cyclic prefix mode, a time delay with respect to a reference cell, an uplink and downlink configuration mode, a special subframe mode, a system bandwidth, and the like, but are not limited thereto. The cell identifier, cyclic prefix pattern and time delay of the neighboring cell with respect to the reference cell may be obtained after the neighboring cell is searched. The uplink and downlink configuration mode, the special subframe mode, and the system bandwidth may be obtained from system information of the neighboring cell, for example, may be obtained from a master information block and a system information block of the neighboring cell. There may be one or more neighbor cells.
The downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe. Similar to the method for determining downlink symbols of the reference cell, when determining downlink symbols of the neighboring cell, the method can determine downlink subframes and special subframes of the neighboring cell according to the uplink and downlink configuration mode of the neighboring cell; and determining downlink symbols in the special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
S106, determining a Cell-specific Reference Signal (CRS) of the adjacent Cell in a time domain intersection part of the downlink symbol of the adjacent Cell and the downlink symbol of the Reference Cell.
As an exemplary method for determining a CRS of a neighboring cell, a time domain intersection portion of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell may be determined according to a time delay of the neighboring cell relative to the reference cell, then a CRS in a downlink subframe of the neighboring cell in the time delay intersection portion may be determined according to a cyclic prefix pattern of the neighboring cell, and a CRS in a special subframe of the neighboring cell in the time delay intersection portion may be determined according to a special subframe pattern and a cyclic prefix pattern of the neighboring cell.
S108, according to the CRS of the neighboring cell, performing cell measurement in a first frequency domain range, where the first frequency domain range is a smaller system bandwidth of the system bandwidths of the neighboring cell and the reference cell, or the first frequency domain range is a smallest central bandwidth of the system, for example, in an LTE system, the first frequency domain range may be a central 1.08MHz bandwidth of the system.
The cell measurement includes: reference Signal Received Power (RSRP), carrier Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), etc. And performing linear average on the power of the CRS of the adjacent cell in the first frequency domain range to obtain the Reference Signal Received Power (RSRP) of the adjacent cell. The RSRP represents the absolute power of the received reference signal. And carrying out linear average on the power of the symbols with the CRS of the adjacent cell in the first frequency domain range to obtain the RSSI (received Signal Strength indication) of the carrier wave of the adjacent cell. The RSRQ can be calculated according to the RSRP and the RSSI, and represents a relative ratio of the reference signal power to the total received power, and the RSRQ can be calculated by using the following formula:
RSRQ＝N×RSRP/RSRQ，
wherein N represents the number of resource blocks (RBs for short) within the measurement bandwidth (i.e., within the first frequency domain).
In addition, when performing the correlation measurement, all or part of the signals in the CRS of the neighbor cell may be selected for measurement calculation. When all signals in the CRS of the adjacent cell are selected for measurement calculation, the measurement duration can be shortened relative to the selection of partial signals, and the measurement accuracy is provided.
The cell measurement method can determine the measurement symbol of the adjacent cell in the time domain range of the reference cell according to the system configuration parameters, and carry out cell measurement on the measurement symbol in a certain frequency domain range, thereby completing measurement in different cell time delays, and being suitable for communication systems of time-frequency two-dimensional resource allocation modes, such as an LTE system and the like.
The invention can also measure the reference cell. Fig. 2 shows a schematic flow chart of another exemplary embodiment of the cell measurement method of the present invention. As shown in fig. 2, the method of this embodiment further includes the following steps based on the embodiment shown in fig. 1:
s210, according to the cyclic prefix mode of the reference cell, the CRS in the downlink subframe of the reference cell is determined.
S212, according to the special subframe mode and the cyclic prefix mode of the reference cell, the CRS in the special subframe of the reference cell is determined.
S214, according to the CRS of the reference cell, performing cell measurement in a second frequency domain range, where the second frequency domain range is a system bandwidth of the reference cell, or the second frequency domain range is a minimum central bandwidth of the system, for example, in an LTE system, the second frequency domain range may be a central 1.08MHz bandwidth of the system.
Similar to the neighbor cells, the cell measurements of the reference cell may include: performing linear average on the power of the CRS of the reference cell in a second frequency domain range to obtain the RSRP of the reference cell; and performing linear average on the power of the symbols with the CRS of the reference cell in the second frequency domain range to obtain the RSSI of the reference cell. The RSRQ can be calculated according to the RSRP and the RSSI, and a specific calculation formula is the same as that in the neighboring cell, which is not described herein again.
It should be noted that, the measurement of the reference cell and the measurement of the neighboring cell are not in sequence.
The cell measurement method can measure not only the adjacent cell, but also the reference cell, thereby providing a basis for the device in the communication system of the time-frequency two-dimensional resource allocation mode during cell reselection and cell switching and realizing seamless movement of the device.
An example is given below in order to make the solution of the invention more clear. Fig. 3 shows a schematic flow chart of a further exemplary embodiment of the cell measurement method of the present invention. As shown in fig. 3, the method of this embodiment includes the steps of:
s302, the reference cell is synchronized, and the cell identifier, the cyclic prefix mode and other configuration parameters of the reference cell are obtained.
S304, acquiring system information of the reference cell, wherein the system information comprises configuration parameters such as an uplink and downlink configuration mode, a special subframe mode, a system bandwidth and the like.
For example, referring to the uplink and downlink configuration mode of the cell as mode 1, it can be known from table 1 that the uplink and downlink subframe allocation of subframes 0 to 9 is as shown in fig. 4, where the slashed part indicates the downlink symbol. Since subframe 0 is a downlink subframe and the last subframe or subframes are also downlink subframes in this mode 1, it can be used for measurement together with subframe 0. Here, the patterns are reordered, and fig. 5 shows the uplink and downlink subframe allocation of subframe 9 to subframe 8.
S306, searching the adjacent cell, and obtaining the cell identification of the adjacent cell, the time delay relative to the reference cell, the cyclic prefix mode and other configuration parameters.
S308, system information of each adjacent cell is obtained, wherein the system information comprises configuration parameters of an uplink and downlink configuration mode, a special subframe mode, system bandwidth and the like of the adjacent cell.
For example, two neighboring cells are searched, the uplink and downlink configuration mode of the neighboring cell 1 is mode 2, the time delay relative to the reference cell is time delay 1, the uplink and downlink configuration mode of the neighboring cell 2 is mode 1, the time delay relative to the reference cell is time delay 2, and according to the sequence from subframe 9 to subframe 8, the uplink and downlink subframe allocation and time delay relationship of the reference cell and the neighboring cell are as shown in fig. 6.
S310, selecting CRS in the downlink symbols according to the configuration parameters of the reference cell, and performing cell measurement in a second frequency domain range.
As shown in fig. 6, the grid part of the reference cell represents the downlink symbol part of the reference cell. For the reference cell, the CRS in the downlink symbol part may be used for measurement, and the measurement bandwidth is the system bandwidth of the reference cell or the central 1.08MHz bandwidth of the system.
S312, according to the configuration parameters of the adjacent cell and the configuration parameters of the reference cell, the CRS of the adjacent cell and the CRS of the reference cell at the intersection part of the downlink symbols are determined, and cell measurement is carried out in a first frequency domain range.
As shown in fig. 6, the grid part of the neighboring cell indicates a downlink symbol intersection part of the neighboring cell and the reference cell, the CRS of the grid part is used for measurement of the neighboring cell, and the slashed part indicates a downlink symbol region where the neighboring cell is not received due to cell delay. The measurement bandwidth is the smaller of the system bandwidths of both the neighbor cell and the reference cell or the central 1.08MHz bandwidth of the system.
According to the cell measurement method, the cell measurement device can determine the measurement symbol of the adjacent cell in the time domain range of the reference cell according to the system configuration parameters, and perform cell measurement on the measurement symbol in a certain frequency domain range, so that the measurement can be completed in different cells in a time delay manner, and the method is suitable for communication systems with time-frequency two-dimensional resource allocation modes, such as an LTE system and the like. In addition, the reference cell can be measured, so that a basis is provided for the device in the communication system in the time-frequency two-dimensional resource allocation mode during cell reselection and cell handover, and seamless movement of the device is realized.
Fig. 7 is a schematic structural diagram of an exemplary embodiment of the cell measurement apparatus of the present invention. As shown in fig. 7, the apparatus of this embodiment includes:
a reference cell downlink symbol determining unit 702, configured to determine a downlink symbol of a reference cell according to a configuration parameter of the reference cell;
a downlink symbol determining unit 704 of the neighboring cell, configured to determine a downlink symbol of the neighboring cell according to the configuration parameter of the neighboring cell;
a reference signal determining unit 706, configured to determine a CRS of a neighboring cell in a time domain intersection part of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell; and
a cell measurement unit 708, configured to perform cell measurement in a first frequency domain range according to the CRS of the neighboring cell, where the first frequency domain range is a smaller system bandwidth of the neighboring cell and the system bandwidth of the reference cell, or the first frequency domain range is a central bandwidth of a minimum system.
Fig. 8 is a schematic structural diagram of another exemplary embodiment of the cell measurement apparatus of the present invention. As shown in fig. 8, the apparatus of this embodiment further includes: a configuration parameter obtaining unit 810, configured to obtain configuration parameters of a reference cell, where the configuration parameters of the reference cell include a cyclic prefix mode obtained after synchronization of the reference cell, and an uplink and downlink configuration mode, a special subframe mode, and a system bandwidth obtained from system information of the reference cell; and acquiring configuration parameters of the neighboring cell, wherein the configuration parameters of the neighboring cell comprise a cyclic prefix mode acquired after the neighboring cell is searched, time delay relative to a reference cell, and an uplink and downlink configuration mode, a special subframe mode and a system bandwidth acquired from system information of the neighboring cell.
Based on the embodiment shown in fig. 7 or fig. 8, the reference cell downlink symbol determining unit 702 may be specifically configured to determine a downlink subframe and a special subframe of the reference cell according to an uplink and downlink configuration mode of the reference cell; determining a downlink symbol in a special subframe of a reference cell according to a special subframe mode and a cyclic prefix mode of the reference cell; the downlink symbols of the reference cell comprise all symbols of a downlink subframe and downlink symbols in a special subframe.
Based on the embodiment shown in fig. 7 or fig. 8, the neighboring cell downlink symbol determining unit 704 may be specifically configured to determine a downlink subframe and a special subframe of the neighboring cell according to an uplink and downlink configuration mode of the neighboring cell; determining downlink symbols in special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell; the downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe.
Based on the embodiment shown in fig. 7 or fig. 8, the reference signal determination unit 706 includes:
a downlink symbol intersection determining subunit, configured to determine, according to a time delay between the neighboring cell and the reference cell, a time domain intersection portion between the downlink symbol of the neighboring cell and the downlink symbol of the reference cell; and
the adjacent cell reference signal determining subunit is used for determining the CRS in the downlink subframe of the adjacent cell in the delay intersection part according to the cyclic prefix mode of the adjacent cell; and determining the CRS in the special subframe of the adjacent cell in the delay intersection part according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
Based on the embodiment shown in fig. 7 or fig. 8, the cell measurement unit 708 may be specifically configured to perform linear average on the power of the CRS of the neighboring cell in the first frequency domain range to obtain the RSRP of the neighboring cell; or, performing linear average on the power of the symbols with the CRS of the neighboring cell in the first frequency domain range to obtain the RSSI of the neighboring cell. RSRQ can be calculated according to RSRP and RSSI, and the specific calculation formula can refer to the foregoing.
Based on the embodiment shown in fig. 7 or fig. 8, the reference signal determining unit 706 is further configured to determine a CRS in a downlink subframe of the reference cell according to a cyclic prefix pattern of the reference cell; and determining the CRS in the special subframe of the reference cell according to the special subframe mode and the cyclic prefix mode of the reference cell. Correspondingly, the cell measurement unit 708 is further configured to perform cell measurement in a second frequency domain range according to the CRS of the reference cell, where the second frequency domain range is a system bandwidth of the reference cell, or the second frequency domain range is a minimum central bandwidth of the system.
A cell measurement unit 708, configured to perform linear average on the power of the CRS of the reference cell in the second frequency domain range to obtain an RSRP of the reference cell when measuring the reference cell; and performing linear average on the power of the symbols with the CRS of the reference cell in the second frequency domain range to obtain the RSSI of the reference cell. The RSRQ can be calculated according to the RSRP and the RSSI, and a specific calculation formula is the same as that in the neighboring cell, which is not described herein again.
The cell measurement device determines the measurement symbol of the adjacent cell in the time domain range of the reference cell according to the system configuration parameters, and performs cell measurement on the measurement symbol in a certain frequency domain range, so that the measurement can be completed in different cell time delays, and the cell measurement device is suitable for communication systems of time-frequency two-dimensional resource allocation modes, such as an LTE system and the like. In addition, the reference cell can be measured, so that a basis is provided for the device in the communication system in the time-frequency two-dimensional resource allocation mode during cell reselection and cell handover, and seamless movement of the device is realized.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (15)
1. A cell measurement method, comprising:
determining a downlink symbol of a reference cell according to the configuration parameters of the reference cell;
determining a downlink symbol of the adjacent cell according to the configuration parameters of the adjacent cell;
determining a cell-specific reference signal CRS of an adjacent cell in a time domain intersection part of a downlink symbol of the adjacent cell and a downlink symbol of a reference cell;
according to the CRS of the adjacent cell, cell measurement is carried out in a first frequency domain range, wherein the first frequency domain range is the smaller system bandwidth of the adjacent cell and the system bandwidth of the reference cell, or the first frequency domain range is the minimum central bandwidth of the system.
2. The method of claim 1, further comprising:
acquiring configuration parameters of a reference cell, wherein the configuration parameters of the reference cell comprise a cyclic prefix mode acquired after synchronization of the reference cell, and an uplink and downlink configuration mode, a special subframe mode and a system bandwidth acquired from system information of the reference cell;
and acquiring configuration parameters of the adjacent cell, wherein the configuration parameters of the adjacent cell comprise a cyclic prefix mode acquired after the adjacent cell is searched, time delay relative to a reference cell, an uplink and downlink configuration mode, a special subframe mode and system bandwidth acquired from system information of the adjacent cell.
3. The method according to claim 1 or 2, wherein the step of determining the downlink symbol of the reference cell according to the configuration parameter of the reference cell specifically comprises:
determining a downlink subframe and a special subframe of a reference cell according to an uplink and downlink configuration mode of the reference cell;
determining a downlink symbol in a special subframe of a reference cell according to a special subframe mode and a cyclic prefix mode of the reference cell;
the downlink symbols of the reference cell comprise all symbols of a downlink subframe and downlink symbols in a special subframe.
4. The method according to claim 1 or 2, wherein the step of determining the downlink symbol of the neighboring cell according to the configuration parameter of the neighboring cell specifically includes:
determining a downlink subframe and a special subframe of the adjacent cell according to the uplink and downlink configuration mode of the adjacent cell;
determining downlink symbols in special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell;
the downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe.
5. The method according to claim 1 or 2, wherein the step of determining the cell-specific reference signals CRS of the neighboring cells in the time domain intersection of the downlink symbols of the neighboring cells and the downlink symbols of the reference cell specifically comprises:
determining a time domain intersection part of a downlink symbol of the adjacent cell and a downlink symbol of the reference cell according to the time delay of the adjacent cell relative to the reference cell;
according to a cyclic prefix mode of an adjacent cell, determining a CRS in a downlink subframe of the adjacent cell in a delay intersection part;
and determining the CRS in the special subframe of the adjacent cell in the delay intersection part according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
6. The method according to claim 1, wherein the step of performing cell measurement in the first frequency domain according to the CRS of the neighboring cells specifically comprises:
performing linear average on the power of the CRS of the adjacent cell in a first frequency domain range to obtain the Reference Signal Received Power (RSRP) of the adjacent cell; or,
and carrying out linear average on the power of the symbols with the CRS of the adjacent cell in the first frequency domain range to obtain the RSSI (received Signal Strength indication) of the carrier wave of the adjacent cell.
7. The method of claim 1 or 2, further comprising:
determining a CRS in a downlink subframe of a reference cell according to a cyclic prefix mode of the reference cell;
determining CRS in the special subframe of the reference cell according to the special subframe mode and the cyclic prefix mode of the reference cell;
and according to the CRS of the reference cell, carrying out cell measurement in a second frequency domain range, wherein the second frequency domain range is the system bandwidth of the reference cell, or the second frequency domain range is the minimum central bandwidth of the system.
8. The method according to claim 7, wherein the step of performing cell measurement in the second frequency domain according to the CRS of the reference cell specifically comprises:
performing linear average on the power of the CRS of the reference cell in a second frequency domain range to obtain the RSRP of the reference cell; or,
and performing linear average on the power of the symbols with the CRS of the reference cell in the second frequency domain range to obtain the RSSI of the reference cell.
9. A cell measurement apparatus, comprising:
a reference cell downlink symbol determining unit, configured to determine a downlink symbol of a reference cell according to a configuration parameter of the reference cell;
a downlink symbol determining unit of the neighboring cell, configured to determine a downlink symbol of the neighboring cell according to the configuration parameter of the neighboring cell;
a reference signal determining unit, configured to determine a cell-specific reference signal CRS of a neighboring cell in a time domain intersection part of a downlink symbol of the neighboring cell and a downlink symbol of a reference cell; and
the cell measurement unit is configured to perform cell measurement in a first frequency domain range according to the CRS of the neighboring cell, where the first frequency domain range is a smaller system bandwidth of the neighboring cell and the system bandwidth of the reference cell, or the first frequency domain range is a central bandwidth of a minimum system.
10. The apparatus of claim 9, further comprising:
a configuration parameter obtaining unit, configured to obtain configuration parameters of a reference cell, where the configuration parameters of the reference cell include a cyclic prefix mode obtained after synchronization of the reference cell, and an uplink and downlink configuration mode, a special subframe mode, and a system bandwidth obtained from system information of the reference cell; and acquiring configuration parameters of the neighboring cell, wherein the configuration parameters of the neighboring cell comprise a cyclic prefix mode acquired after the neighboring cell is searched, time delay relative to a reference cell, and an uplink and downlink configuration mode, a special subframe mode and a system bandwidth acquired from system information of the neighboring cell.
11. The apparatus according to claim 9 or 10, wherein the reference cell downlink symbol determination unit is specifically configured to determine the downlink symbol of the reference cell
Determining a downlink subframe and a special subframe of a reference cell according to an uplink and downlink configuration mode of the reference cell;
determining a downlink symbol in a special subframe of a reference cell according to a special subframe mode and a cyclic prefix mode of the reference cell;
the downlink symbols of the reference cell comprise all symbols of a downlink subframe and downlink symbols in a special subframe.
12. The apparatus according to claim 9 or 10, wherein the neighbor cell downlink symbol determination unit is specifically configured to determine the downlink symbol of the neighbor cell
Determining a downlink subframe and a special subframe of the adjacent cell according to the uplink and downlink configuration mode of the adjacent cell;
determining downlink symbols in special subframes of the adjacent cell according to the special subframe mode and the cyclic prefix mode of the adjacent cell;
the downlink symbols of the adjacent cell comprise all symbols of the downlink subframe and downlink symbols in the special subframe.
13. The apparatus of claim 9 or 10, wherein the reference signal determination unit comprises:
a downlink symbol intersection determining subunit, configured to determine, according to a time delay between the neighboring cell and the reference cell, a time domain intersection portion between the downlink symbol of the neighboring cell and the downlink symbol of the reference cell; and
the adjacent cell reference signal determining subunit is used for determining the CRS in the downlink subframe of the adjacent cell in the delay intersection part according to the cyclic prefix mode of the adjacent cell; and determining the CRS in the special subframe of the adjacent cell in the delay intersection part according to the special subframe mode and the cyclic prefix mode of the adjacent cell.
14. The apparatus according to claim 9, wherein the cell measurement unit is specifically configured to
Performing linear average on the power of the CRS of the adjacent cell in a first frequency domain range to obtain the Reference Signal Received Power (RSRP) of the adjacent cell; or,
and carrying out linear average on the power of the symbols with the CRS of the adjacent cell in the first frequency domain range to obtain the RSSI (received Signal Strength indication) of the carrier wave of the adjacent cell.
15. The apparatus according to claim 9 or 10, wherein the reference signal determining unit is further configured to determine a CRS in a downlink subframe of a reference cell according to a cyclic prefix pattern of the reference cell; determining CRS in the special subframe of the reference cell according to the special subframe mode and the cyclic prefix mode of the reference cell;
the cell measurement unit is further configured to perform cell measurement in a second frequency domain range according to the CRS of the reference cell, where the second frequency domain range is a system bandwidth of the reference cell, or the second frequency domain range is a minimum central bandwidth of the system.
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