CN106559775B - Method and device for updating system information in LTE (Long term evolution) system - Google Patents
Method and device for updating system information in LTE (Long term evolution) system Download PDFInfo
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- CN106559775B CN106559775B CN201510618884.1A CN201510618884A CN106559775B CN 106559775 B CN106559775 B CN 106559775B CN 201510618884 A CN201510618884 A CN 201510618884A CN 106559775 B CN106559775 B CN 106559775B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
- H04W8/20—Transfer of user or subscriber data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
Abstract
The application discloses a method for updating system information in an LTE system, which comprises the following steps: determining a resident network through network search when the UE is started or is out of synchronization and then reestablishes synchronization; when the UE establishes a PCH channel for the first time, receiving a paging message at the position of a first PO; and when the paging message indicates that the system information is updated, extracting the updated system information, and applying the updated system information in the next system information modification period. By applying the method and the device, the system information can be updated in time when the UE is re-synchronized after being started or out of step.
Description
Technical Field
The present invention relates to a channel detection technology in a communication system, and in particular, to a PCH detection method and apparatus when a UE is powered on in an LTE system.
Background
The LTE system divides the system information into a master information block mib (masterinformation block) and a plurality of system information blocks sib (systemlnformaticblocks) according to the importance of the broadcast information content and the difference of the transmission mode. The system information does not change all the time, and if the system information does not change for a long time (3h), the UE will retry to receive the system information. If the system information on the network side changes, the network side needs to notify the UE to update the system information.
Generally, there are three scenarios for system information update:
1) neighbor information changes;
2) the user number changes and modifies SRS or CQI resource allocation information;
3) updating the system information once in 3 hours;
4) changing system information of the cell, such as changing the maximum transmitting power of the UE;
in order to ensure the consistency of the UE and the network side system information, the TD-LTE system introduces the concept of a system information modification period: the system information content in the modification period is not changed, and the system information modification is started from the starting time of the next system information modification period, namely, after the UE knows that the system information is changed, the system information is updated at the starting time of the next modification period.
The specific procedure according to the protocol 36.331-940 is shown in fig. 1, where different system information is marked with different patterns, grey representing old system information and slashes representing system information after update.
Wherein, BCCH modification period is modified periodic time × default paging cycle.
The TD-LTE system supports two notification modes of system information change:
1) the network side uses the paging message carrying the content of systemInfoModification to inform the UE in the idle state and the connection state of the change of the system information, and the UE updates the system information when the next modification period begins.
2) SIB1 carries systemlnfovaluetag information, and if the change tag read by the UE is different from the one previously stored, it indicates that the system information is changed and needs to be read again.
In order to reduce power consumption of the UE in the RRC _ IDLE state, the UE receives a paging message using a discontinuous reception mode (DRX). The UE in RRC _ IDLE state monitors PDCCH in specific subframes, which are called paging occasions, the radio frame in which these subframes are located is called paging radio frame (PF), and two parameters related to PF and PO are T and nB, which are notified to the UE by system information SIB 2. Where T denotes the DRX parameter, the network broadcasts this parameter to the terminals in the system information SIB2, which has a range of values 32, 64, 128, 256.
For the mode of notifying the system information change by adopting the paging message, through tests, the UE which is just started up can not always ensure that the system information is updated in time.
Disclosure of Invention
The application provides a method and a device for updating system information in an LTE system, which can ensure that UE which is just started up can update the system information in time.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a method for updating system information in an LTE system comprises the following steps:
determining a resident network through network search when the UE is started or is out of synchronization and then reestablishes synchronization;
when the UE establishes a PCH channel for the first time, receiving a paging message at the position of a first PO;
and when the paging message indicates that the system information is updated, extracting the updated system information, and applying the updated system information in the next system information modification period.
A system information updating apparatus in an LTE system, comprising: the system comprises a network searching unit, a paging receiving unit and a system information updating unit;
the network searching unit is used for determining a resident network through network searching when the UE is started or synchronization is reestablished after loss of synchronization;
the paging unit is used for receiving a paging message at the position of the first PO when the PCH channel is established for the first time after the network is determined to reside; when the paging message indicates that the system message is updated, notifying a system information updating unit;
and the system information updating unit is used for extracting the updated system information and applying the updated system information in the next system information modification period.
According to the technical scheme, the resident network is determined through network search when the UE is started or is reestablished synchronization after being out of synchronization; when UE establishes a PCH channel for the first time, receiving a paging message at the position of a first PO; and when the paging message indicates that the system message is updated, extracting the updated system information, and applying the updated system information in the next system information modification period. By the mode, even if the paging opportunity is missed in the network searching process, the updating of the system information can be found in time through the active paging message receiving, so that the system information can be ensured to be updated in time.
Drawings
FIG. 1 is a schematic diagram of a protocol 36.331-940 for notification of system information changes;
FIG. 2 is a diagram illustrating a scenario in which a paging occasion is missed during a resynchronization procedure after a UE is powered on or out of synchronization;
FIG. 3 is a schematic diagram of a basic flow chart of a system information updating method according to the present application;
fig. 4 is a schematic diagram of active PAGING reception in the example of the present application.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
When the paging message is used to notify that the system information is changed, the UE which is just started up often cannot ensure that the system information is updated in time. The following is to analyze the reason why the UE cannot update the system information in time by comparing the process of notifying the system information change by the paging message and the specific processing after the UE is powered on in time sequence.
Specifically, as shown in fig. 2, it is assumed that the BCCH modification period (n) sends a paging message to notify the UE that the system information changes, and in a normal case, the system information changes in the next period. And the process of reestablishing synchronization after the UE is started or is out of synchronization cannot receive PAGING at the initial stage of network searching. After the PCH channel is established, the PAGING receiving period may have been missed, and the system information of the UE is the old system information, so that the system information of the base station and the terminal side is inconsistent. It can be seen that the system information is not updated in time just because the UE misses the time for receiving PAGING.
In order to solve the above problem, modification of the base station side may be considered, and the number of PAGING transmissions may be increased, which may increase delay time for updating system information, and the system side needs to increase subframes for transmitting PAGING, resulting in an increase of air interface overhead. And the problem cannot be completely solved because the probability can only be reduced by increasing the sending times.
Based on the above analysis, the present application provides a method for updating system information, as shown in fig. 3, the method includes:
The processing of this step is the same as the existing method, and is not described here again.
Step 302, when the UE establishes the PCH channel for the first time, it actively receives a paging message at the location of the first PO.
In the flow of the method, except PAGING reception is carried out at normal PO and PF positions, when UE establishes PCH channel, PAGING reception is actively carried out at the position of the first PO no matter whether the reception opportunity of PAGING message PAGING is missed or not, thereby ensuring that UE does not miss PAGING message sent due to system information update.
And determining whether the system information is updated or not through the reception of the paging message actively, if not, ending the process, and if so, extracting the updated system information and applying the updated system information in the next system information modification period.
The system information updating method in the application is ended. Through the method and the process, when the UE is started or is out of step and then is re-established to be synchronous, even if the receiving opportunity of the paging message is missed in the network searching process, whether the system information is updated or not can be timely found through the receiving of the paging message actively carried out when the PCH is established for the first time, so that the inconsistency of the system information of the base station and the terminal side is avoided.
A specific example is given below, as shown in fig. 4, modifying the cell configuration causes cell shutdown, no downlink data is sent in the cell, resulting in terminal offline, cell reactivation, and UE does not receive PAGING at the initial stage of network search, so that the time for UE to receive all system information of the cell may miss PAGING detection time, and thus it cannot know that the next modification period of the system information needs to be updated. If the cell-level SRS resources on the terminal side and the base station side are not aligned, uplink data transmission does not avoid the cell-level SRS, which may result in uplink error. However, after the system information updating method shown in fig. 3 is applied, when the PCH channel is established, the system information is actively received, so that the system information can be updated in time, the system information of the terminal side and the system information of the base station side are ensured to be consistent, the problem of inconsistent system information is solved, and the problem of increased uplink error codes is avoided.
The foregoing is a specific implementation of the system information updating method in the present application. The application also provides a system information updating device which can be used for implementing the updating method. Specifically, the system information updating apparatus in the present application includes: the system comprises a network searching unit, a paging receiving unit and a system information updating unit.
The network searching unit is used for determining a resident network through network searching when the UE is started or synchronization is reestablished after loss of synchronization. The paging unit is used for receiving paging messages at the position of the first PO when a PCH channel is established for the first time after the network is determined to reside; and when the received paging message indicates that the system message is updated, notifying a system information updating unit. And the system information updating unit is used for extracting the updated system information and applying the updated system information in the next system information modification period.
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 made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. A method for updating system information in an LTE system is characterized by comprising the following steps:
determining a resident network through network search when the UE is started or is out of synchronization and then reestablishes synchronization;
when the UE establishes a PCH channel for the first time, receiving a paging message at the position of a first PO;
and when the paging message indicates that the system information is updated, extracting the updated system information, and applying the updated system information in the next system information modification period.
2. A system information updating apparatus in an LTE system, comprising: the system comprises a network searching unit, a paging receiving unit and a system information updating unit;
the network searching unit is used for determining a resident network through network searching when the UE is started or synchronization is reestablished after loss of synchronization;
the paging receiving unit is configured to receive a paging message at a first PO location when a PCH channel is first established after the network residence is determined; when the paging message indicates that the system message is updated, notifying a system information updating unit;
and the system information updating unit is used for extracting the updated system information and applying the updated system information in the next system information modification period.
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| CN114640952B (en) * | 2020-12-15 | 2023-11-03 | 上海华为技术有限公司 | Message processing method, terminal and network equipment |
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| CN101272601A (en) * | 2007-03-21 | 2008-09-24 | 华为技术有限公司 | System information updating method, equipment and system |
| CN101547508B (en) * | 2008-03-24 | 2010-12-15 | 大唐移动通信设备有限公司 | Method, device and system for processing a page |
| CN101784097B (en) * | 2009-01-16 | 2015-05-20 | 中兴通讯股份有限公司 | System message update instructing method and device |
| CN103428855B (en) * | 2012-05-25 | 2017-10-20 | 电信科学技术研究院 | A kind of sending, receiving method and its device of system message update information |
| US9497682B2 (en) * | 2013-06-07 | 2016-11-15 | Intel Corporation | Central processing unit and methods for supporting coordinated multipoint transmission in an LTE network |
| CN104301869B (en) * | 2013-07-17 | 2017-11-24 | 华为技术有限公司 | The detection method and equipment of a kind of terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102149193A (en) * | 2011-05-17 | 2011-08-10 | 新邮通信设备有限公司 | Updating method for system information in LTE (long term evolution) system |
| CN102905245A (en) * | 2011-07-25 | 2013-01-30 | 中兴通讯股份有限公司 | Method and device for updating information of residential area system in long-term evolution system |
| CN103906236A (en) * | 2012-12-26 | 2014-07-02 | 普天信息技术研究院有限公司 | Method for acquiring main information block information by user |
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