WO2013053234A1

WO2013053234A1 - Method and device for increasing network search speed of public land mobile network

Info

Publication number: WO2013053234A1
Application number: PCT/CN2012/075948
Authority: WO
Inventors: 朱广卿
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-10-11
Filing date: 2012-05-23
Publication date: 2013-04-18
Also published as: CN102355712A

Abstract

Disclosed are a method and a device for increasing a network search speed of a public land mobile network (PLMN). The method comprises: when it is required to perform a network search of a PLMN and initiate an initial cell search, a UE querying the state of each frequency band of the PLMN (101); according to the queried predetermined priority level of the state of each frequency band, performing corresponding frequency scanning or frequency band set scanning (102). The present invention is capable of finding a suitable cell to reside in at a very high speed, thereby reducing the power consumption of a UE and enhancing the user experience.

Description

Method and device for accelerating search speed of public land mobile network

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for searching a network speed of a public land mobile network. Background technique

After the UE (user terminal) is powered on, it attempts to perform a PLMN (Public Land Mobile Network) search network, and after finding a suitable cell to camp and completing the location registration process, normal services can be performed. Regardless of the PLMN search process, after selecting a certain type of PLMN, the UE starts searching for the appropriate cell camp within the PLMN. This process is called cell selection.

The general procedure for cell selection is as follows: First, it is determined whether there is cell information camped on before the PLMN, and if so, the cells are preferentially tried to camp; if no information is available or tried, the initial cell search is initiated.

The initial cell search process includes frequency sweeping and cell search. First, scanning is performed on a given frequency band, and the received signal strength indication (RSSI) is arranged in descending order to sequentially perform cell search at each frequency point.

In the prior art initial cell search process, it is always necessary to initiate full-band frequency sweeping, and for a general UE, there may be multiple PLMNs that may be camped, if a full frequency band is initiated each time a PLMN performs an initial cell search. Sweeping, it will consume more power and time. Summary of the invention

In view of the above analysis, the present invention aims to provide a method and apparatus for accelerating the search speed of a public land mobile network, which is used to solve the problem of power consumption and time consuming in the prior art due to the use of full-band scanning. The object of the present invention is mainly achieved by the following technical solutions:

A method for accelerating the speed of PLMN search, including:

When the PLMN search network is required and the initial cell search is initiated, the user terminal UE queries the status of each frequency band of the PLMN;

According to the predetermined priority of the status of each frequency band that is queried, the corresponding frequency point scanning or frequency band set scanning is performed.

Before initiating the initial cell search, it also includes:

The UE pre-establishes a frequency table of each type of PLMN that it supports and stores the PLMN ID included in each frequency table and the frequency band information of the UE capability support frequency band, wherein the frequency band information includes: a status of each frequency band, the frequency band is already stored. The number of discrete frequency points and the stored discrete frequency points.

The status of the frequency band includes: unknown, unsupported, but the frequency information is incomplete, and the supported and complete frequency information; wherein, the unknown state is the initial state of the frequency band.

The stored process includes:

After the UE successfully camps on a 'j, zone, record the PLMNID of the cell;

Performing matching processing according to the frequency information supported by the PLMN and the frequency information stored in the frequency table, and setting the state of the frequency band not supported by the UE to be unsupported; for the frequency band supported by the UE, the cell and its neighboring area The main frequency point is added to the frequency table as a discrete frequency point, and then it is judged whether the number of stored frequency points is equal to the maximum number of center frequency points supported by the frequency band, and if so, the state of the frequency band is set to support but the frequency point information Incomplete, otherwise the status of the band is set to support and the frequency information is complete.

The process of querying the status of each frequency band of the PLMN by the UE includes:

When the PLMN search network is required and the initial cell search is initiated, the frequency band information of all frequency bands supported by the capability is acquired;

For each frequency band in the frequency table of the PLMN, a query is made according to a predetermined priority of a state of each frequency band from high to low, wherein the predetermined priority is from high to low: Supported and frequency information Complete state, support for frequency information but incomplete state, unknown state.

Before initiating the initial cell search, it also includes:

It is judged whether there is cell information in which the UE camped before the PLMN, and if so, priority is given to camping in the cell; if no or the attempt fails, an initial cell search is initiated.

According to the predetermined priority of the status of each frequency band that is queried, the process of performing corresponding frequency point scanning or frequency band set scanning includes:

For each frequency band in the frequency table, it is preferred to store the discrete frequency sweep in the frequency band whose state is supported and the frequency information is complete; if the frequency band in the state where the state is supported and the frequency information is complete, the attempt is in the state of Supporting frequency band aggregation sweeping in frequency bands with incomplete frequency information; If the frequency band with the status is supported and the frequency information is complete and the frequency band whose status is supported but the frequency point is incomplete fails, try to use the frequency band with unknown status. Perform frequency band sweeps; do nothing for bands that are not supported.

A device for accelerating PLMN search speed, comprising:

The query module is configured to query the status of each frequency band of the PLMN when the PLMN search network is needed;

The scanning module is configured to perform corresponding frequency point scanning or frequency band set scanning according to a predetermined priority of the status of each frequency band that is queried.

Also includes:

a storage module, configured to pre-establish a frequency table of each type of PLMN that it supports, and store the PLMN ID included in each frequency table and the frequency band information of the UE capability support frequency band, where the frequency band information includes: a status of each frequency band, The number of discrete frequency points and stored discrete frequency points that have been stored in this band.

The storage module is configured to pre-establish a frequency table of each type of PLMN that it supports and The PLMN ID included in each frequency table and the frequency band information of the UE capability support band are stored, and after the UE successfully camps on a cell, the PLMNID of the cell is recorded; according to the frequency information supported by the PLMN obtained from the cell and the frequency The frequency information stored in the table is matched, and the state of the frequency band not supported by the UE is set to be unsupported. For the frequency band supported by the UE, the primary frequency point of the cell and its neighboring cell is added to the frequency table, and then the stored frequency is determined. Whether the number of points is equal to the maximum number of center frequency points supported by the frequency band. If yes, the status of the frequency band is set to support but the frequency point information is incomplete. Otherwise, the status of the frequency band is set to be supported and the frequency point information is complete.

The querying module is configured to: when starting a PLMN search and initiate an initial cell search, acquire frequency band information of all frequency bands supported by the UE capability; and then, for each frequency band in the frequency table of the PLMN, according to a state of each frequency band. The priority is queried from high to low, wherein the predetermined priority is from high to low: Supports the complete state of the frequency information, supports the frequency information but the incomplete state, and the unknown state.

The querying module is further configured to: before starting the initial cell search, determine whether there is cell information that the UE camped in before the PLMN, and if yes, try to camp on the cell first; if not, or the attempt fails, Initiate an initial cell search.

The scanning module is configured to, for each frequency band in the frequency table, preferentially store a discrete frequency point sweep in a frequency band with a state supported and complete frequency information; if the frequency band in which the state is supported and the frequency information is complete is resident If the failure occurs, the frequency band set sweep is performed in the frequency band whose status is supported but the frequency information is incomplete. If the frequency band with the status is supported and the frequency information is complete and the frequency band whose status is supported but the frequency point is incomplete fails, Try to sweep the frequency band in the frequency band with unknown status; do not perform any operation for the frequency band whose status is not supported.

The beneficial effects of the present invention are as follows:

The invention can find a suitable cell to camp at a very fast speed, reduce the power consumption of the UE, and improve the feeling of the user experience. DRAWINGS

1 is a schematic flowchart of a method according to an embodiment of the present invention;

2 is a schematic diagram of an information storage process of a PLMNFRequencyList in a method according to an embodiment of the present invention;

3 is a schematic flowchart of an initial cell search in a method according to an embodiment of the present invention; and FIG. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in which: FIG.

First, the method according to the embodiment of the present invention will be described in detail with reference to FIG. 1 to FIG. 3.

As shown in FIG. 1 , FIG. 1 is a schematic flowchart of a method according to an embodiment of the present invention, which mainly includes: Step 101: When a PLMN search is required and an initial cell search is initiated, the UE queries the status of each frequency band of the PLMN.

Step 102: Perform corresponding frequency scanning or frequency band set scanning according to a predetermined priority of the status of each frequency band that is queried.

Before performing step 101, the method further includes: the UE pre-establishing a PLMNFrequencyList of each type of PLMN supported by the UE (the public land mobile network frequency table, hereinafter referred to as a frequency table) and the PLMN ID included in each PLMNFrequencyList and the frequency band of the UE capability support frequency band. The information is stored, wherein the frequency band information includes: a status of each frequency band, a number of discrete frequency points stored in the frequency band, and a stored discrete frequency point.

Table 1 of the following Table 1 is a PLMNF requencylist according to an embodiment of the present invention, which mainly includes: a PLMNID (Public Land Mobile Network Identity) and UE capability support band information, where

The PLMNID is used to identify the network and consists of MCC (Mobile Country Code) and MNC (Mobile Network Code);

The UE capability support band information consists of three parts: the status of the band, which is already stored in the band. The number of discrete frequency points and the stored discrete frequency points; wherein, the state of the frequency band includes four, respectively, 1 is unknown; 2 is not supported; 3 is supported but the frequency information is incomplete; 4 is supported and the frequency information is complete.

Table 1

As shown in Table 1, for example, the UE capability supports eight frequency bands of eight, F, and E, Freq_A_State represents the state of the A-band, Freq_A_Num represents the number of discrete frequency points stored in the A-band, and Freq_A[FREQ_A_MAXNUM] represents the stored discrete. Frequency. (Note: China Mobile's 3G access standard is TD-SCDMA, and three frequency bands are planned, namely A-band (2010~2025MHz), F-band (1880~1900MHz), and E-band (2320~2370MHz). Only the A-band is actually put into commercial use.

As shown in FIG. 2, FIG. 2 is a schematic diagram of an information storage process of a PLMNFrequencyList in a method according to an embodiment of the present invention. A first storage space is opened in a storage area of a UE to store a predetermined number of PLMNFRequencyLists, where the predetermined number is not less than 1. In a specific implementation, the initial value of the PLMNID in the PLMNFrequencyList structure is null, the initial state of each frequency band is 1 unknown, the initial stored discrete frequency point number of each frequency band is 0, and the discrete frequency point array is empty.

Step 201: The UE successfully camps on a TD-SCDMA cell, successfully reads system information of the cell, and completes a location registration process.

In step 202, the PLMNID of the cell is stored in the system message, and the PLMNID is recorded in the PLMNFRequencyList. In the embodiment of the present invention, the type of the PLMN is assumed to be the RPLMN. Step 203: The RPLMN support included in the received message sent by the network side is received. The frequency band information is matched with the frequency band information in the PLMNFrequencyList;

Step 204: Determine whether there is a frequency band information supported by the RPLMN in the PLMNFrequencyList. If not, go to step 205; otherwise, go to step 206; Step 205, set the status of the frequency band in the PLMNFRequencyList to "2 is not supported"; Step 206, the TD-SCDMA cell and The main frequency of the neighboring area is stored in the PLMNFrequencyList (only different frequency points are stored, the same frequency point is stored only once), and each time a different frequency point is added, the number of stored discrete frequency points is increased by 1; At the frequency point, the status of the band is changed from the initial state "1 unknown" to "3 support but the frequency information is incomplete";

Step 207, determining whether the number of stored discrete frequency points is equal to the maximum number of center frequency points supported by the frequency band; if yes, proceeding to step 208; otherwise, proceeding to step 206;

Step 208, changing the status of the frequency band from "3 support, the frequency information is incomplete" to "4 support, the frequency information is complete", and then the write operation of the frequency band storage area is no longer performed;

In the above embodiment, for example, the China Mobile A-band (2010~2025MHz) has a total bandwidth of 15MHz and a carrier frequency bandwidth of 1.6MHz. Therefore, the maximum number of center frequency points supported by the A-band is 9. In the current TD-SCDMA network environment frequency planning, the multi-carrier frequency-frequency networking is adopted in the A-band, and there are 9 center frequency points, and the channel numbers are 10055, 10063, 10071, 10080, 10088, 10096, 10104, 10112 respectively. 10120. Each cell is generally configured with 10~30 inter-frequency/inter-frequency neighbors, so the PLMNFrequencyList information storage process can be completed only by camping for 1~2 cells.

As shown in FIG. 3, FIG. 3 is a schematic flowchart of a process of initial cell search in a method according to an embodiment of the present invention, which may specifically include:

Step 301: When it is required to initiate a PLMN search, first determine whether there is cell information that is camped on before the PLMN, and if yes, try to try to camp on the cells; if no information is available after trying or not, the initial is initiated. Cell search, proceeds to step 302;

Step 302: Obtain all frequency band information supported by the UE capability.

Step 303, query whether the specified PLMNFrequencyList information exists in the first storage space of the UE; if yes, proceed to step 305; otherwise, proceed to step 304;

Step 304: Try to perform full-band frequency sweeping in all frequency bands supported by the UE capability; Step 305: Query a status of each frequency band in the PLMNFRequencyList.

Step 306: Is there a frequency band in the PLMNFrequencyList whose state is "4 support, the frequency information is complete"; if yes, go to step 307; otherwise, go to step 309.

Step 307, preferentially attempting to store the discrete frequency sweep in the frequency band of state 4, and sequentially performing the cell search on each frequency point in descending order of RSSI (received signal strength indication); Step 308, whether the frequency band of state 4 is Can't successfully reside? If yes, go to step 309; otherwise, go to step 314;

Step 309, whether there is a frequency band in the PLMNFrequencyList whose state is "3 support, the frequency information is incomplete"; if yes, go to step 310; otherwise, go to step 312;

Step 310: Try to perform frequency band sweeping in the frequency band with the status of 3, and sequentially perform the cell search at each frequency point according to the RSSI descending order.

Step 311: Is the frequency band of state 3 unable to successfully reside? If yes, go to step 312; otherwise, go to step 314;

Step 312: Is there a frequency band with a status of "1 unknown" in the PLMNFrequencyList? If yes, go to step 313; otherwise, go to step 314;

Step 313: Try to perform frequency band swept scanning in the frequency band with the status of 1, and sequentially try to perform cell search at each frequency point according to the RSSI descending order.

Step 314, ending the initial cell search process. As can be seen in conjunction with FIG. 3 and FIG. 4, as long as the UE has previously camped on a certain PLMN, the next time the initial cell search is initiated on the PLMN, the full frequency band sweeping is not necessary, but the stored frequency point can be utilized. Information, discrete frequency sweeps, saving time and resources. Exemplarily, the frequency band supported by a certain UE capability is A frequency band (2010~2025MHz) and F frequency band (1880~1900MHz), and the bandwidth is 35MHz. With the general sweep algorithm, it takes about 15 seconds to perform full-band sweeping on the two frequency bands. If only the actual discrete frequency points in the two frequency sets are swept, it only takes about 1 second. It can be seen that the method of the embodiment of the present invention can significantly improve the search speed. Next, the device according to the embodiment of the present invention will be described in detail with reference to FIG.

As shown in FIG. 4, FIG. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention, which mainly includes: an Query Module, configured to query a status of each frequency band of the PLMN when a PLMN search is needed;

The embodiment of the present invention further includes: a storage module, configured to pre-establish a frequency table of each type of PLMN that it supports, and store the frequency information of the included PLMN ID and the UE capability support frequency band in each frequency table, where the frequency band information Including: the status of each frequency band, the number of discrete frequency points stored in the frequency band, and the stored discrete frequency points; the status of the frequency band includes: unknown, unsupported, supported but the frequency information is incomplete, and the support and frequency information is complete. ; The unknown state is the initial state of the band.

Specifically, the storage module pre-establishes the frequency table of each type of PLMN it supports and stores the PLMN ID included in each frequency table and the frequency band information of the UE capability support frequency band, after the UE successfully camps on a cell. Recording the PLMNID of the cell; performing matching processing according to the frequency information supported by the PLMN obtained from the cell and the frequency information stored in the frequency table, and setting the state of the frequency band not supported by the UE to be unsupported; Add the primary frequency point of the cell and its neighboring area to the frequency table, and then determine whether the calculated number of frequency points is equal to the maximum number of central frequency points supported by the frequency band, and if so, set the status of the frequency band to support but The frequency information is incomplete, otherwise the status of the frequency band is set to support and the frequency information is complete.

Before initiating the initial cell search, the query module determines whether there is cell information that is camped on before the PLMN, and if so, preferentially attempts to camp on the cell; if no or the attempt fails, initiates an initial cell search; when starting the PLMN When searching for the network and initiating the initial cell search, the query module acquires the frequency band information of all the frequency bands supported by the UE capability; and then, for each frequency band in the frequency table of the PLMN, the predetermined priority level of each frequency band is inquired from the highest to the low, The predetermined priority is from high to low: Supports the complete state of the frequency information, supports the frequency information but the incomplete state, and the unknown state.

For each frequency band in the frequency table, the scanning module preferentially stores the discrete frequency point sweep in the frequency band whose state is supported and the frequency information is complete; if the frequency band in which the state is supported and the frequency information completes fails, try to If the status is supported and the frequency information is incomplete, the frequency band is swept; if the status is supported and the frequency information is complete, and the frequency is inactive but the frequency is incomplete, the status is unknown. The frequency band is swept by the frequency band; no operation is performed for the frequency band whose state is not supported.

The specific implementation process of the device in the embodiment of the present invention has been described in detail in the above method, and therefore will not be described herein.

In summary, the embodiment of the present invention does not need to scan all the frequency points in the frequency range of the UE or the frequency range of the PLMN network when performing the specified PLMN search. It is only necessary to scan the actual discrete frequency points according to the specified PLMN network frequency planning information. In this way, a suitable cell can be found to camp at a very fast speed, which reduces the power consumption of the UE and improves the user experience.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for accelerating a PLMN search network speed of a public land mobile network, comprising: when a PLMN search network is required and an initial cell search is initiated, the user terminal UE queries the status of each PLMN frequency band;

2. The method according to claim 1, wherein before initiating the initial cell search, the method further comprises:

The method according to claim 1 or 2, wherein the status of the frequency band includes: unknown, unsupported, but the frequency information is incomplete, and the frequency information is complete; wherein the unknown state is the initial state of the frequency band. .

The method according to claim 3, wherein the storing process comprises: after the UE successfully camps on a 'j, a zone, recording a PLMNID of the cell;

5. The method according to claim 3, wherein the process of querying the status of each frequency band of the PLMN by the UE includes:

When the PLMN search is required and the initial cell search is initiated, all the capabilities are supported. Frequency band information of the frequency band;

For each frequency band in the frequency table of the PLMN, the predetermined priority according to the state of each frequency band is queried from high to low, wherein the predetermined priority is from high to low: support and complete frequency state information, support frequency point Information but incomplete state, unknown state.

The method according to claim 1, wherein before the initial cell search is initiated, the method further comprises: determining whether there is cell information in which the UE camped before the PLMN, and if so, preferentially attempting to camp on the cell; If no or attempt fails, an initial cell search is initiated.

7. The method according to claim 3, wherein the process of performing corresponding frequency point scanning or frequency band set scanning according to a predetermined priority of the status of each frequency band that is queried comprises:

8. A device for accelerating the speed of PLMN search, comprising:

9. The device according to claim 8, further comprising:

The device according to claim 8 or 9, wherein the status of the frequency band includes: unknown, unsupported, but the frequency information is incomplete, and the frequency information is complete; wherein the unknown state is the initial state of the frequency band. .

The device according to claim 10, wherein the storage module is configured to store the frequency band information of the UE capability support frequency band in advance, and record the PLMNID of the cell after the UE successfully camps on a cell; The frequency information supported by the PLMN obtained from the cell is matched with the frequency information stored in the frequency table, and the state of the frequency band not supported by the UE is set to be unsupported; for the frequency band supported by the UE, the cell and its neighboring area are added. The main frequency points to the frequency table, and then determines whether the number of stored frequency points is equal to the maximum number of center frequency points supported by the frequency band. If yes, the status of the frequency band is set to be supported but the frequency point information is incomplete, otherwise the The status of the band is set to support and the frequency information is complete.

12. The apparatus according to claim 10, wherein the querying module is configured to: acquire frequency band information of all frequency bands supported by the UE capability when starting the PLMN search and initiate an initial cell search; and then, for the frequency of the PLMN Each frequency band in the table is queried according to a predetermined priority of the status of each frequency band, wherein the predetermined priority is from high to low: a state in which the frequency information is supported and the frequency information is supported, but the frequency information is incomplete. , unknown state.

The device according to claim 8, wherein the querying module is further configured to: before starting the initial cell search, determine whether there is cell information that the UE camped in before the PLMN, and if yes, prioritize the attempt The cell camps; if no or the attempt fails, an initial cell search is initiated.

The device according to claim 10, wherein the scanning module is configured to, for each frequency band in the frequency table, preferentially store a discrete frequency sweep in a frequency band whose state is supported and the frequency information is complete; If the frequency band whose status is supported and the frequency information completes fails, try to perform frequency band aggregation sweep in the frequency band whose status is supported but the frequency information is incomplete. If the status is If the frequency band with complete frequency information and the frequency band whose status is supported but the frequency point is incomplete fails, try to sweep the frequency band in the frequency band with unknown status; do not perform any operation for the frequency band whose status is not supported.