CN101557628B - Measurement starting method of cell reselection and mobile terminal thereof - Google Patents
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Abstract
The invention discloses a measurement starting method of cell reselection. The method comprises the following steps: obtaining standard path loss parameters of a cell currently resided by a mobile terminal and signal to noise ratio of a broadcast channel; and starting measurement by the mobile terminal for adjacent cells according to the obtained standard path loss parameters and the signal to noise ratio of the broadcast channel when the standard path loss parameters are greater than a threshold of cofrequency measurement startup and a threshold of alien frequency measurement, and the signal to noise ratio of the broadcast channel is smaller than a signal to noise ratio threshold. The invention further discloses the mobile terminal in which the standard path loss parameters and the signalto noise ratio threshold of the broadcast channel are taken as bases for measuring the adjacent cells started by the mobile terminal, which causes the mobile terminal to more reasonably start measure ment for the adjacent cells in an idle mode, thus ensuring the mobile terminal to be capable of performing cell reselection in real time. The method and the mobile terminal help improve mobile terminal call success rate, and achieve the purpose of power saving in the idle mode of the mobile terminal.
Description
Technical Field
The present invention relates to a cell reselection technology, and in particular, to a measurement starting method for cell reselection and a mobile terminal.
Background
In a mobile communication system, since a User Equipment (UE) has strong mobility, the UE in an idle mode sometimes moves from one cell to another cell by moving across the cells, and thus needs to reselect the cell. The purpose of cell reselection is to timely and correctly update the cell where the UE resides, so that the UE can timely reside in an ideal cell, thereby not only ensuring that the UE correctly receives broadcast messages and paging messages from a mobile communication system, but also ensuring the success rate of initiating a random access call by the UE.
The UE performing cell reselection needs to start measurement on the neighboring cell, so that the UE can timely and accurately reselect to a suitable resident cell. In the prior art, the measurement starting condition for the adjacent cell is SrxDetermined by a criterion, SrxA path loss standard parameter representing the current resident cell of the UE, which is used for representing the distance S between the UE and the base station of the current resident cellrxThe value is larger, which indicates that the UE is closer to the base station of the current resident cell; srxAnd the smaller value indicates that the UE is far away from the base station of the current resident cell. Wherein S isrxCalculated according to the broadcast Channel Received Power (P-CCPCH RSCP, Primary-Common Control Physical Channel Received Signal Code Power) of the cell where the UE currently resides, and P-CCPCH RSCP is measured by the UE, and S is calculatedrxThe formula of (1) is:
Srx＝Qrxlevmeas-Qrxlev min-Pcom (1)
in formula (1), Qrxlevmeas represents a measurement value for P-CCPCH RSCP, Qrxlev min represents a minimum reception power value of a cell required by the mobile communication system, Qrxlev min is notified to the UE by the mobile communication system through a broadcast message, and Pcom represents a power value required by a base station of a cell where the UE currently resides to receive an uplink Random Access Channel (RACH). Pcom is calculated by:
Pcom＝MAX(UE_TXMAX_RACH-P_MAX，0) (2)
in formula (2), UE _ TXMAX _ RACH denotes a maximum transmission power value allowed by the UE on the RACH, UE _ TXMAX _ RACH is notified to the UE by the mobile communication system through a broadcast message, and P _ MAX denotes a maximum transmission power value of the UE; the value of Pcom is the larger value chosen between UE _ TXMAX _ RACH-P _ MAX and 0.
In the prior art, a threshold value S for UE to perform adjacent co-frequency cell measurement is setintrasearchAnd a threshold value S for measuring adjacent pilot frequency cellsintersearchWhen S isrx≤SintrasearchWhen the UE starts measurement on adjacent co-frequency cells, the adjacent co-frequency cells refer to cells which are adjacent to the cell where the UE currently resides and work at the same frequency; when S isrx≤SintersearchWhen the UE starts measurement on the adjacent pilot frequency cell, the adjacent pilot frequency cell is a cell which is adjacent to the cell where the UE currently resides and works at different frequencies.
Existing method of initiating cell measurements, at SintrasearchAnd SintersearchSet up biasWhen the cell reselection rate is low, the UE is prone to untimely measurement of the adjacent cells, and cell reselection failure is caused; and at SintrasearchAnd SintersearchWhen the setting is too high, it is easy to cause the UE to perform the neighboring cell measurement in advance, and the purpose of saving power of the UE in the idle mode cannot be achieved. When the existing method for starting cell measurement is applied to the region with overlapped cell coverage, if the P-CCPCH RSCP of each cell is higher, the method is as per SrxAccording to the criterion, the UE cannot perform measurement of the adjacent cells, and the cell reselection cannot be performed; however, due to the co-Channel interference of the Channel, the signal-to-noise ratio (P-CCPCH C/I, Primary-common control Physical Channel C/I) of the current cell where the UE resides is relatively low, and in this case, the UE cannot correctly demodulate the broadcast message from the mobile communication system in the current cell, so that the success rate of the UE call is reduced.
Disclosure of Invention
In view of the above, the present invention provides a method for starting cell reselection measurement and a mobile terminal, so as to solve the problem that when the method for starting cell measurement in the prior art is applied to an area with severe channel interference, the UE call success rate is reduced due to untimely measurement start.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a measurement starting method for cell reselection, which comprises the following steps:
acquiring a path loss standard parameter of a current resident cell of the mobile terminal and a signal-to-noise ratio of a broadcast channel;
and according to the acquired path loss standard parameters and the signal-to-noise ratio of the broadcast channel, when the path loss standard parameters are larger than a threshold value for starting same-frequency measurement and a threshold value for starting different-frequency measurement, and the signal-to-noise ratio of the broadcast channel is smaller than the signal-to-noise ratio threshold value, starting the measurement of the mobile terminal on the adjacent cell.
Before the obtaining of the path loss standard parameter of the current resident cell and the signal-to-noise ratio of the broadcast channel, the method further includes: and storing the set threshold value for starting the same-frequency measurement, the threshold value for starting the different-frequency measurement and the threshold value of the signal-to-noise ratio.
The signal-to-noise ratio of the broadcast channel is derived from measurements of the mobile terminal.
The obtaining of the path loss standard parameter of the current resident cell of the mobile terminal specifically includes:
measuring a broadcast channel reception power of the mobile terminal;
and calculating to obtain the path loss standard parameter according to the receiving power of the broadcast channel.
The measurement of the mobile terminal on the adjacent cells comprises the measurement of the adjacent co-frequency cells and the adjacent pilot frequency cells, and the measurement quantity is the broadcast channel receiving power of the adjacent co-frequency cells and the adjacent pilot frequency cells.
The signal-to-noise ratio threshold value is obtained by a system simulation or network planning method.
The present invention also provides a mobile terminal, comprising: the system comprises a parameter acquisition unit and a cell measurement starting unit which are connected with each other; wherein,
the parameter acquiring unit is used for acquiring a path loss standard parameter of a cell where the mobile terminal currently resides and a signal-to-noise ratio of a broadcast channel;
the cell measurement starting unit is used for starting the measurement of the mobile terminal to the adjacent cell when the path loss standard parameter is larger than a threshold value for starting the same-frequency measurement and a threshold value for starting the pilot frequency measurement and the signal-to-noise ratio of the broadcast channel is smaller than the threshold value of the signal-to-noise ratio according to the acquired path loss standard parameter and the signal-to-noise ratio of the broadcast channel.
The mobile terminal further includes: and the threshold value storage unit is connected with the cell measurement starting unit and is used for storing the set threshold value for starting the same-frequency measurement, the threshold value for starting the different-frequency measurement and the threshold value of the signal-to-noise ratio.
The parameter acquisition unit includes: the parameter measuring subunit and the operation subunit are connected with each other; wherein,
the parameter measuring subunit is used for measuring the receiving power of a broadcast channel of the mobile terminal and the signal-to-noise ratio of the broadcast channel;
and the operation subunit is used for calculating the path loss standard parameter according to the broadcast channel receiving power.
The cell measurement starting unit includes: a comparator unit and a cell measurement promoter unit connected to each other; wherein,
the comparing subunit is configured to compare the acquired path loss standard parameter with the threshold for initiating the intra-frequency measurement and the threshold for initiating the inter-frequency measurement, compare the signal-to-noise ratio of the broadcast channel with the threshold for the signal-to-noise ratio, generate a comparison result, and provide the comparison result to the cell measurement starting subunit;
and the cell measurement starting subunit is used for starting the measurement of the mobile terminal to the adjacent cell when the path loss standard parameter is larger than a threshold value for starting the same-frequency measurement and a threshold value for starting the different-frequency measurement and the signal-to-noise ratio of the broadcast channel is smaller than a signal-to-noise ratio threshold value according to the comparison result.
The cell reselection measurement starting method and the mobile terminal provided by the invention adopt SrxThe criterion is combined with the set P-CCPCH C/I threshold value to be used as the basis for UE to start measurement on the adjacent cells, and S is carried outrx＞Sintrasearch、Srx＞SintersearchAnd P-CCPCH C/I < (C/I)measIn time, the UE starts to measure the P-CCPCH RSCP of the adjacent cell, so that the measurement opportunity of the UE starting to measure the adjacent cell in the idle mode is more reasonable, thereby ensuring that the measurement opportunity of the UE starting to measure the adjacent cell is ensuredThe UE can reselect the cell in time, which is beneficial to improving the success rate of UE calling and also achieves the purpose of saving electricity of the UE in an idle mode.
Drawings
Fig. 1 is a flowchart of a measurement starting method for cell reselection according to the present invention;
fig. 2 is a flowchart of a measurement starting method for cell reselection according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a composition structure of a mobile terminal according to the present invention.
Detailed Description
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
The invention provides a measurement starting method for cell reselection, which comprises the following steps ofrxAnd the P-CCPCH C/I threshold value is used as a basis for the UE to start measurement on the adjacent cells, so that the measurement opportunity for the UE to start the measurement on the adjacent cells in the idle mode is more reasonable. As shown in fig. 1, the method for starting measurement of cell reselection mainly includes the following steps:
The UE in the idle mode measures the P-CCPCH RSCP and P-CCPCH C/I of the current resident cell, and obtains S by calculation according to the formula (1) and (2) according to the measured P-CCPCH RSCPrx。
S to be obtained by UErxAnd stored SintrasearchAnd SintersearchCompare and compare the P-CCPCH C/I with a stored signal-to-noise ratio threshold (C/I)meaxComparing when the condition S is satisfiedrx＞Sintrasearch、Srx＞SintersearchAnd P-CCPCH C/I < (C/I)measThe UE initiates measurements of neighboring cells, including measurements of P-CCPCH RSCP of neighboring intra-frequency cells and neighboring inter-frequency cells.
It is noted that the S stored in the UEintrasearch、SintersearchAnd (C/I)measThe setup is performed in the UE by the staff before the above step 101. Wherein, (C/I)measCan be determined by a system simulation method or a network planning method, wherein the system simulation method means that various wireless environments in a mobile communication system are simulated and different (C/I) settings are setmeasThe value is to examine the parameters of UE such as call success rate and cell reselection rate, and select the (C/I) with higher corresponding call success rate and cell reselection rate through analysis and comparisonmeasA value; the network planning method is to simulate various actual scenes by network planning software and select a proper (C/I) from the output results of the network planning softwaremeasThe value is obtained.
The method for starting cell reselection measurement according to the present invention is further described in detail below with reference to specific embodiments, and as shown in fig. 2, the embodiments of the present invention mainly include the following steps:
in step 201, the UE obtains the P-CCPCH RSCP and P-CCPCCHC/I of the current resident cell through measurement.
The UE in idle mode measures P-CCPCH RSCP and P-CCPCH C/I of the currently camped cell in each Discontinuous Reception (DRX) period.
And step 204, the UE starts to measure the P-CCPCH RSCP of the adjacent co-frequency cell, and the process is ended after the measurement is finished. The adjacent co-frequency cell refers to a cell which is adjacent to the cell where the UE currently resides and operates on the same frequency.
It should be noted that S is usually set in practical applicationsintrasearchHas a value slightly larger than SintersearchIs thus at SrxUnder the condition of smaller value, the UE can preferentially measure the adjacent same-frequency cells and then preferentially switch to the adjacent same-frequency cells, because the switching of the adjacent same-frequency cells is carried out, compared with the switching of the adjacent different-frequency cells, the operation is simpler, and the UE preferentially selects and switches to the adjacent same-frequency cells, so that the purpose of saving electricity of the UE can be achieved.
In step 206, the UE starts to measure the P-CCPCH RSCP of the neighboring inter-frequency cell, and ends the procedure after the measurement is completed. The neighboring inter-frequency cell refers to a cell that is adjacent to the cell where the UE currently resides and operates at a different frequency.
In step 208, the UE starts measurement of P-CCPCH RSCP of the neighboring cell, and ends the procedure after the measurement is completed. The measurements include measurements of adjacent co-frequency cells and adjacent inter-frequency cells because at Srx＞Sintrasearch、Srx＞SintersearchDue to SrxThe measurement threshold value of the adjacent co-frequency cell is not only higher than the measurement threshold value of the adjacent inter-frequency cell, but also higher than the measurement threshold value of the adjacent inter-frequency cell, and the UE cannot know that it is more appropriate to preferentially reselect the co-frequency cell or preferentially reselect the inter-frequency cell, so that the UE needs to measure both the adjacent co-frequency cell and the adjacent inter-frequency cell.
The method for starting the cell reselection measurement utilizes SrxThe method and the device measure the broadcast channel receiving power condition of the current resident cell of the UE and measure the channel interference condition of the current resident cell of the UE by using the P-CCPCH C/I, so that the UE starts the measurement of the adjacent cell in time under the condition that the broadcast channel receiving power of the current resident cell is lower or the channel interference is more serious, and the UE is ensured to reselect the cell in time.
In order to realize the cell reselection measurement starting method, the invention also provides a mobile stationA mobile terminal, as shown in fig. 3, the mobile terminal includes: a parameter acquisition unit 10, a cell measurement starting unit 20 and a threshold value storage unit 30. A parameter obtaining unit 10, configured to obtain S of a cell where the mobile terminal currently residesrxAnd P-CCPCH C/I. A cell measurement starting unit 20, a connection parameter obtaining unit 10, configured to obtain S according to the obtained SrxAnd P-CCPCH C/I, when the condition S is satisfiedrx＞Sintrasearch、Srx＞SintersearchAnd P-CCPCCHC/I < (C/I)measAnd starting the measurement of the mobile terminal on the adjacent cell. A threshold value storage unit 30 connected to the cell measurement starting unit 20 for storing the S set by the staff on the mobile terminalintrasearch、SintersearchAnd (C/I)measS stored in the threshold value storage unit 30intrasearch、SintersearchAnd (C/I)measFor provision to the cell measurement initiating unit 20.
Wherein, the parameter obtaining unit 10 further includes: a parameter measuring subunit 11 and an operation subunit 12 which are connected with each other. And the parameter measuring subunit 11 is used for measuring the P-CCPCH RSCP and P-CCPCCHC/I of the mobile terminal. An operation subunit 12 for calculating S according to the P-CCPCH RSCP measured by the parameter measurement subunit 11rx。
The cell measurement starting unit 20 further includes: the comparator unit 21 and the cell measurement promoter unit 22 are connected to each other. A comparison subunit 21 connected to the parameter measurement subunit 11, the operation subunit 12 and the threshold value storage unit 30, and configured to calculate S obtained by the operation subunit 12rxS stored in the threshold value storage unit 30intrasearchAnd SintersearchCompares the measured P-CCPCCHC/I of the parameter measuring subunit 11 with (C/I) stored in the threshold value storage unit 30measThe comparison is performed and the result of the comparison is provided to the cell measurement promoter unit 22. A cell measurement promoter unit 22 connected to the comparator unit 21 for satisfying the condition S according to the comparison result from the comparator unit 21rx＞Sintrasearch、Srx＞SintersearchAnd P-CCPCH C/I＜(C/I)measAt this time, measurements of the neighboring cells, including measurements of P-CCPCH RSCP of neighboring intra-frequency cells and neighboring inter-frequency cells, by the mobile terminal are initiated.
In summary, the measurement starting method for cell reselection and the mobile terminal provided by the present invention employ SrxThe criterion is combined with the set P-CCPCH C/I threshold value to be used as the basis for starting the measurement of the adjacent cell by the UE, so that the measurement opportunity for starting the measurement of the adjacent cell by the UE in the idle mode is more reasonable, the UE can timely reselect the cell, the success rate of UE calling is favorably improved, and the purpose of saving power by the UE in the idle mode is also achieved. The cell reselection measurement starting method and the mobile terminal of the present invention can be applied to a third Generation mobile communication technology (3G, 3rd Generation) system, such as: time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, Wideband Code Division Multiple Access (WCDMA) system, and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for starting measurement of cell reselection, comprising:
acquiring a path loss standard parameter of a current resident cell of the mobile terminal and a signal-to-noise ratio of a broadcast channel;
and according to the acquired path loss standard parameters and the signal-to-noise ratio of the broadcast channel, when the path loss standard parameters are larger than a threshold value for starting same-frequency measurement and a threshold value for starting different-frequency measurement, and the signal-to-noise ratio of the broadcast channel is smaller than the signal-to-noise ratio threshold value, starting the measurement of the mobile terminal on the adjacent cell.
2. The method for starting measurement of cell reselection according to claim 1, wherein before the obtaining of the path loss criterion parameter and the signal-to-noise ratio of the broadcast channel of the currently camped cell, the method further comprises: and storing the set threshold value for starting the same-frequency measurement, the threshold value for starting the different-frequency measurement and the threshold value of the signal-to-noise ratio.
3. The method of claim 1, wherein the snr of the broadcast channel is measured by the mobile terminal.
4. The method for starting measurement of cell reselection according to claim 1, wherein the obtaining of the path loss criterion parameter of the cell where the mobile terminal currently resides specifically comprises:
measuring a broadcast channel reception power of the mobile terminal;
and calculating to obtain the path loss standard parameter according to the receiving power of the broadcast channel.
5. The method according to claim 1, wherein the measurement performed by the mobile terminal on the neighboring cell includes measurement performed on neighboring intra-frequency cells and neighboring inter-frequency cells, and the measurement is broadcast channel received power of the neighboring intra-frequency cells and neighboring inter-frequency cells.
6. The method for starting measurement of cell reselection according to any one of claims 1 to 5, wherein the SNR threshold is obtained by a system simulation or a network planning method.
7. A mobile terminal, comprising: the system comprises a parameter acquisition unit and a cell measurement starting unit which are connected with each other; wherein,
the parameter acquiring unit is used for acquiring a path loss standard parameter of a cell where the mobile terminal currently resides and a signal-to-noise ratio of a broadcast channel;
the cell measurement starting unit is used for starting the measurement of the mobile terminal to the adjacent cell when the path loss standard parameter is larger than a threshold value for starting the same-frequency measurement and a threshold value for starting the pilot frequency measurement and the signal-to-noise ratio of the broadcast channel is smaller than the threshold value of the signal-to-noise ratio according to the acquired path loss standard parameter and the signal-to-noise ratio of the broadcast channel.
8. The mobile terminal of claim 7, wherein the mobile terminal further comprises: and the threshold value storage unit is connected with the cell measurement starting unit and is used for storing the set threshold value for starting the same-frequency measurement, the threshold value for starting the different-frequency measurement and the threshold value of the signal-to-noise ratio.
9. The mobile terminal according to claim 7 or 8, wherein the parameter obtaining unit comprises: the parameter measuring subunit and the operation subunit are connected with each other; wherein,
the parameter measuring subunit is used for measuring the receiving power of a broadcast channel of the mobile terminal and the signal-to-noise ratio of the broadcast channel;
and the operation subunit is used for calculating the path loss standard parameter according to the broadcast channel receiving power.
10. The mobile terminal according to claim 7 or 8, wherein the cell measurement initiating unit comprises: a comparator unit and a cell measurement promoter unit connected to each other; wherein,
the comparing subunit is configured to compare the acquired path loss standard parameter with the threshold for initiating the intra-frequency measurement and the threshold for initiating the inter-frequency measurement, compare the signal-to-noise ratio of the broadcast channel with the threshold for the signal-to-noise ratio, generate a comparison result, and provide the comparison result to the cell measurement starting subunit;
and the cell measurement starting subunit is used for starting the measurement of the mobile terminal to the adjacent cell when the path loss standard parameter is larger than a threshold value for starting the same-frequency measurement and a threshold value for starting the different-frequency measurement and the signal-to-noise ratio of the broadcast channel is smaller than a signal-to-noise ratio threshold value according to the comparison result.
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| CN102083161A (en) * | 2009-11-30 | 2011-06-01 | ***通信集团广西有限公司 | Method, system for updating cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) network and user equipment |
| CN103209426B (en) * | 2012-01-17 | 2016-03-30 | 华为技术有限公司 | A kind of user terminal alien frequencies switch before method of measurement and device |
| CN111431639A (en) * | 2013-06-06 | 2020-07-17 | 索尼公司 | Wireless communication method and wireless communication device |
| CN104349341A (en) * | 2013-08-01 | 2015-02-11 | 中兴通讯股份有限公司 | District reselection measuring method and apparatus, and mobile terminal |
| CN104427548B (en) * | 2013-09-02 | 2018-03-06 | 华为技术有限公司 | Traverse measurement method, network side equipment and the user equipment of multi-carrier networking |
| CN104980949B (en) | 2015-06-30 | 2018-10-19 | 上海华为技术有限公司 | A kind of the startup method and relevant device of different-frequency measure |
| CN109151938B (en) * | 2018-10-12 | 2020-11-17 | 北京久华信信息技术有限公司 | Method, device and equipment for multi-base station roaming switching |
| CN110139332A (en) * | 2019-05-22 | 2019-08-16 | 努比亚技术有限公司 | A kind of residence reselecting of mobile terminal, mobile terminal and storage medium |
| CN112911663B (en) * | 2021-02-03 | 2022-11-01 | Oppo广东移动通信有限公司 | Cell switching method and device, terminal equipment and storage medium |
| WO2023197220A1 (en) * | 2022-04-13 | 2023-10-19 | 北京小米移动软件有限公司 | Neighboring cell measurement method and apparatus, and device and storage medium |
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