WO2010124466A1 - Cell re-selection method, terminal and communication system - Google Patents

Abstract

A cell re-selection method, comprise: the terminal searches a suitable cell from the cells having the private priority according to the obtained private priority; the terminal searches the suitable cell from the cells having the public priority according to the obtained public priority, if the suitable cell could not be found from the cells having the private priority. A system and communication system corresponding to the cell re-selection method are also provided. The terminal could find the suitable cell quickly by using the invention.

Description

 Cell reselection method, terminal and communication system

Technical field

 The present invention relates to the field of communications technologies, and in particular, to a cell reselection method, a terminal, and a communication system.

Background technique

 With the development of wireless communication technologies, a variety of different wireless access technologies have emerged (RAT: Radio)

Access Technology) communication network. Multiple cells using different RATs or different frequencies will cover the same area at the same time. The coverage and other factors will cause communication quality problems, and different RATs or frequencies have different priorities for different services, so different based on different For service priority and/or signal quality problems, the terminal may perform cell reselection of different RATs or frequencies when performing services. When performing cell reselection of different RATs or frequencies, if both the terminal and the network support the priority cell reselection process, the cell reselection adopts a priority algorithm. Among them, the priority is absolute priority, including public priority and dedicated priority. The common priority is sent by the cell through the broadcast system information, and is applicable to all terminals in a cell, that is, the cell has the same common priority for all terminals in the cell; the dedicated priority is sent by the cell through dedicated signaling. A specific terminal is only applicable to that one terminal.

 Therefore, the terminal may have priority of multiple cells, including dedicated priority and common priority, and the cell reselection process is required when the terminal camps on a suitable cell.

 When the terminal camps on a normal cell, the prefer cell becomes a serving cell of the terminal, and the neighboring cell of the serving cell is first measured and reordered (anting) to perform cell reselection. If the terminal camps on a suitable suited cell for cell reselection, the process is as follows: When the terminal resides in the suited cell and cannot find the suitable cell by using the dedicated priority delivered by the network, enter any cell selection ( Any cell selection). status.

 The terminal is in the Any cell selection state, trying all RATs or frequencies to try to find an Acceptable cell, and the Acceptable cell is a cell in which the terminal cannot perform normal services but can make an emergency call.

If the Acceptable cell is not found, the terminal starts the process of selecting the Public Land Mobile Network (PLMN). If an Acceptable cell is found, the terminal camps on the Acceptable cell, attempts all cell RATs and frequencies supported by the terminal to perform cell reselection to find a suitable cell, and reselects the cell in the Acceptable cell according to the broadcast channel of the Acceptable cell. The public priority issued is carried out.

 If a good cell is found, the terminal camps on the found suitable cell. If the suitable cell is not found, the terminal re-enters the Any cell selection state to repeat the above process.

 In the research on the prior art, the inventor found that: When using the above cell reselection method, if the terminal cannot find the suited cell according to the dedicated priority, it is necessary to first try the Any cell selection state to try all the RATs or frequencies to try to find the Acceptable. The cell, and looking for the Acceptable cell, need to try regardless of whether the cell corresponding to the RAT and the cell corresponding to the frequency have absolute priority; then camping on the Acceptable cell and then searching for the suited cell requires a longer cell reselection time, which reduces the user experience. .

Summary of the invention

 The embodiment of the invention provides a cell reselection method, a terminal and a communication system.

 The embodiment of the invention provides a cell reselection method, including:

 The terminal searches for a suitable cell from a cell with a dedicated priority according to the obtained dedicated priority;

 If a suitable cell is not found from the cell having the dedicated priority, the terminal searches for a suitable cell from the cell having the common priority according to the acquired common priority.

 The invention also provides a computer program product comprising computer program code, which, when executed by a computer, causes the computer to perform any of the cell reselection methods A step.

 The present invention also provides a computer readable storage medium, the computer storing computer program code, when the computer program code is executed by a computer, the computer program code can cause the computer to perform any of a cell reselection method A step.

 The embodiment of the invention provides a terminal, including:

 a first searching unit, configured to find a suitable cell from a cell with a dedicated priority according to the acquired dedicated priority;

 And a second searching unit, configured to: when the first searching unit cannot find a suitable cell from the cell with the dedicated priority, search for a suitable cell from the cell with the common priority according to the acquired common priority.

The embodiment of the invention provides a communication system, which includes the terminal provided by the embodiment of the invention. It can be seen from the foregoing technical solutions provided by the embodiments of the present invention that, in the embodiment of the present invention, when the terminal can find the suitable cell by using the dedicated priority, the public priority is used to directly search for the suited cell, so that the terminal does not need to find and After camping on the Acceptable cell, the adaptive cell is searched for from the Acceptable cell, so that the suited cell can be quickly found, so that the terminal can enjoy the service faster and improve the user experience.

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 embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

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

 2 is a structural diagram of an embodiment of a terminal according to an embodiment of the present invention;

 3 is a structural diagram of another embodiment of a terminal according to an embodiment of the present invention;

 4 is a structural diagram of another embodiment of a terminal according to an embodiment of the present invention;

 FIG. 5 is a structural diagram of an embodiment of a communication system according to an embodiment of the present invention.

detailed description

 BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

 The cell reselection method in the embodiment of the present invention is described first. FIG. 1 is a flowchart of an embodiment of a cell reselection method. The embodiment describes a process flow when the terminal camps on a serving cell, including:

101. Search for a suitable cell from a cell with a dedicated priority according to the taken priority. In the process of searching for a suitable cell, whether the cell is a suitable cell may be determined by using priority-related threshold information. Generally, if a cell satisfies the threshold information and the cell is a cell that is allowed to access, for example, the cell is not used by the PLMN. Forbidden, the cell is not forbidden by the location area, and the cell is not a cell reserved by the operator, and the cell can be considered as a suitable cell. The location area may be a tracking area (TA: tracking area) in LTE, and may be in a 3G network. Is the location area (LA: Location Area

 The dedicated priority is pre-acquired by the terminal, and the terminal may obtain the dedicated priority of the cell with the dedicated priority from the dedicated signaling sent by the cell. Since the dedicated priority is only applicable to the terminal, it may be sent through dedicated signaling. Dedicated priority, which allows only the relevant terminal to receive a dedicated priority. Certainly, the cell may also send the threshold information related to the dedicated priority to the terminal, so that the terminal can determine, according to the threshold information, whether the cell with the dedicated priority can be used as the suitable cell. The threshold information may include information such as signal strength.

 102. Determine whether a suitable cell is found from a cell with a dedicated priority; if yes, end the process; if no, enter 103.

 103. Search for a suitable cell from a cell with a common priority according to the obtained common priority; end the process.

 In the process of searching for a suitable cell, whether the cell is a suitable cell may be determined by using priority-related threshold information. Generally, if a cell satisfies the threshold information and the cell is a cell that is allowed to access, for example, the cell is not used by the PLMN. It is forbidden that the cell is not forbidden by the TA/LA. If the cell is not a cell reserved by the operator, the cell can be considered as a suitable cell. In an embodiment of the present invention, the good cell searched from the cell having the common priority may be the serving good cell where the terminal currently camps.

 The common priority is obtained by the terminal in advance, and the terminal may obtain the common priority of the cell with the common priority from the system information broadcasted by the cell, and the common priority is applicable to all the terminals in the cell, so the system information that can be broadcasted The public priority is sent so that all terminals in the cell can receive the public priority of the cell. Certainly, the cell may also send the threshold information related to the public priority to the terminal, so that the terminal can determine, according to the threshold information, whether the cell with the common priority can be used as the suitable cell. The threshold information may include signal strength and/or signal quality, etc. Specifically, in one embodiment of the present invention, the terminal may directly search for asuitable cell from all cells having a common priority; that is, if the terminal acquires 5 cells The public priority, the terminal looks for a suitable cell from the five cells.

In another embodiment of the present invention, the terminal may first determine, from a cell having a common priority, a cell that does not have the acquired dedicated priority, and then determine from all the determined dedicated priorities that do not have the acquired priority. Finding a suitable cell in the cell; that is, if the terminal acquires the common priority of the five cells and also obtains the dedicated priority of the two cells in the five cells, the terminal does not have the dedicated priority from the five cells. Find a suitable community in 3 cells.

 As can be seen from the above, in the embodiment, when the terminal can find the suitable cell by using the dedicated priority, the terminal can directly use the common priority to search for the suited cell, so that the terminal does not need to find and camp on the Acceptable cell, and then finds the suitable from the Acceptable cell. Therefore, thesuitable cell can be found relatively quickly, so that the terminal can enjoy the service faster and improve the user experience.

 In the embodiment of the present invention, the terminal does not need to look up and camp on the Acceptable cell, thereby avoiding the terminal accessing other PLMNs.

 It can be understood that, for a terminal, a cell can have both a dedicated priority and a public-optimized cell, which can be a second-generation mobile communication (2G) global mobile communication system or an improved data rate global mobile communication system wireless access network ( GERAN: GSM EDGE Radio Access Network), which can also be a third-generation mobile communication (3G) global terrestrial radio access (UTRAN) cell, or long-term evolution (LTE: Long Time Evolution) The community and so on. For example, a 2G GERAN cell has a common priority of 5 for all terminals in the cell; for a terminal a of the cell, the cell may also have a dedicated priority of 3.

 In one embodiment of the invention, the public priority of at least two cells having a common priority may be obtained. The at least two cells having a common priority may be at least two cells belonging to different RATs; or at least two cells having different access frequencies; or at least two cells having different access frequencies and different RATs.

 In general, the number of cells with a common priority is greater than or equal to the number of cells with dedicated priorities.

In an embodiment of the present invention, when the terminal searches for a suitable cell from the cell having the acquired common priority, the terminal may maintain the original state, that is, the terminal does not need to change when searching for thesuitable cell from the cell having the acquired common priority. Its own state. For example, if the original state of the terminal is a Camped Normally state, the terminal still maintains the Monitor Normally state when searching for a suitable cell from the cell having the acquired common priority. The terminal maintains the original state, which can further reduce the time for finding the suited cell, so that thesuitable cell can be found more quickly. Enable the terminal to enjoy the service faster and further improve the user experience.

 Another embodiment of the cell reselection method in the embodiment of the present invention is described. The embodiment is described by using the multiple access frequencies of the multiple cells as an example. In this embodiment, if the terminal resides in a serviceable cell, Thesuitable cell cannot be found according to the dedicated priority, does not enter the Any cell selection state, but maintains the original state, and directly searches for the suited cell according to the public priority. When the terminal searches for a good cell according to the common priority, all cells with absolute priority may be considered, that is, a cell having a dedicated priority and a common priority, and a cell having only a common priority.

 Specifically, the terminal has a priority of multiple cells, and the terminal has dedicated priorities Pld, P2d, and P3d for the cells accessing the frequency fl, ΐ2, and β respectively; and the terminal has dedicated to the cells of the frequencies fl, £2, and β respectively. Priority Pic, P2c, P3c; and the terminal also has common priorities P4c, P5c for the cells of frequency f4, f5, respectively. The terminal cannot find the suitable cell according to the dedicated priority, that is, the terminal can not find the suitable cell according to the dedicated priority Pld, P2d, P3d according to the dedicated frequency P1, F2, β, specifically, the access frequency fl, f2, β The cell may not find the suitable cell because the cell reselection criterion cannot be satisfied, or is prohibited by the PLMN, or the TA/LA is prohibited. The cell reselection criterion may be threshold information. The cells accessing the frequencies f4 and f5 are not considered in the process of searching for the preferred cell according to the dedicated priority.

 When the suitable cell cannot be found according to the dedicated priority, the terminal maintains the original state, and searches for the suitable cell according to the public priorities Pic, P2c, P3c, P4c, P5c of the cells of the access frequencies fl, f2, f3, f4, and f5. That is, according to the common priority of the cells of the access frequencies fl, £2, O, f4, and f5, it is determined whether the cells corresponding to the five priorities satisfy the cell reselection criterion, thereby finally finding asuitable cell; specifically, according to the public When the priority cell is searched for a suitable cell, the terminal can further refer to whether the terminal can successfully perform the location area update process. If the location area update can be successfully performed, the cell can be regarded as a suitable cell. If the location area update cannot be successfully performed, the cell cannot be used as the Suitable community. The location area update may be different according to different networks, and may be a routing area update (RAU: Routing Area Update) or a tracking area update (TAU: Tracking Area Update), or a location area update (LAU: Location Area Update). Wait.

As can be seen from the above, in this embodiment, when the terminal can find the suitable cell by using the dedicated priority, the terminal can directly use the common priority to search for the suited cell, so that the terminal does not need to find and reside in the terminal. After the Acceptable cell, the applicable cell is searched from the Acceptable cell, so that the suited cell can be quickly found, so that the terminal can enjoy the service faster and improve the user experience. At the same time, in this embodiment, the terminal does not need to find and camp on the Acceptable cell, thereby avoiding the terminal accessing other PLMNs.

 Another embodiment of the cell reselection method in the embodiment of the present invention is described. The embodiment is described by using the multiple access frequencies of the multiple cells as an example. In this embodiment, if the terminal resides in a serviceable cell, Thesuitable cell cannot be found according to the dedicated priority, does not enter the Any cell selection state, but maintains the original state, and directly searches for the suited cell according to the public priority. Wherein, when the terminal searches for the preferred cell according to the common priority, only the cell having the common priority is considered.

 Specifically, the terminal has a priority of multiple cells, and the terminal has dedicated priorities Pld, P2d, and P3d for the cells accessing the frequency fl, £2, and β respectively; and the terminal has dedicated to the cells of the frequencies fl, f2, and f3, respectively. Priority Pic, P2c, P3c; and the terminal also has a common priority P4c, P5c for the cells of frequency f4, f5, respectively. The terminal cannot find the suited cell according to the dedicated priority cell reselection, that is, the terminal applies the dedicated priority Pld, P2d, P3d to the applicable frequency of the access frequency fl, f2, β, and specifically, the access frequency fl, The cell of £2, β may not be able to satisfy the cell reselection criterion, or is prohibited by the PLMN, or the TA/LA is prohibited, and the terminal may not find the suitable cell. The cell reselection criterion may be the threshold information. Among them, the cells accessing the frequency f4, f5 are not considered in the process of searching for the preferred cell according to the dedicated priority.

 When the second suitable cell is not found according to the dedicated priority, the terminal maintains the original state, and the terminal searches for the suited cell according to the cell common priority P4c, P5c of the access frequency f4, f5, and accesses in the process of searching for the suited cell. The cells of the frequency fl, £2, β are not considered, that is, whether the two cells satisfy the cell reselection criterion based on the common priority of the cells of f4 and f5, thereby finally finding the secondsuitable cell; specifically, When the suitable cell is searched for using the common priority, it is further possible to refer to whether the terminal can successfully perform the location area update process to find thesuitable cell.

As can be seen from the above, in the embodiment, when the terminal can find the suitable cell by using the dedicated priority, the terminal can directly use the common priority to search for the suited cell, so that the terminal does not need to find and camp on the Acceptable cell, and then searches from the Acceptable cell. The suitable cell can find the suitable cell relatively quickly, so that the terminal can enjoy the service faster and improve the user experience. Meanwhile, in this embodiment, the terminal does not need to find and camp on the Acceptable cell, thereby avoiding terminal access. Other PLMN.

 The embodiment of the terminal in the embodiment of the present invention is further described. FIG. 2 illustrates the structure of an embodiment of the terminal. The terminal resides in a serving cell, and the terminal may include:

 a first searching unit 201, configured to obtain a dedicated priority, and find a suitable cell from a cell with a dedicated priority;

 The second searching unit 202 is configured to: when the first searching unit 201 cannot find a suitable cell from the cell with the dedicated priority, find a suitable cell from the cell with the common priority according to the acquired common priority.

 Specifically, when the second search unit 202 searches for a suitable cell from a cell having a common priority, the second cell can be directly searched for the suitable cell from the cell having the common priority; or the cell with the common priority is determined not to have the cell with the common priority. The dedicated priority cell then searches for a suitable cell from all determined cells that do not have a dedicated priority.

 As can be seen from the above, in this embodiment, when the terminal can find the suitable cell by using the dedicated priority, the terminal can directly use the common priority to search for thesuitable cell, so that the terminal does not need to find and camp on the Acceptable cell, and then finds the suitable from the Acceptable cell. The cell can find thesuitable cell relatively quickly, so that the terminal can enjoy the service faster and improve the user experience. In the meantime, the terminal does not need to look up and camp on the Acceptable cell in this embodiment, thereby preventing the terminal from accessing other PLMNs.

 In an embodiment of the present invention, the terminal embodiment provided by the embodiment of the present invention can maintain the original state when searching for a good cell from a cell having a common priority. For example, if the original state of the terminal is the Camped Normally state, the terminal still maintains the Camped Normally state when looking for a suitable cell from the cell with the common priority. By maintaining the original state, the terminal can further reduce the time for searching for the good cell, so that the suitable cell can be found more quickly, so that the terminal can enjoy the service more quickly and further improve the user experience.

 Figure 3 is a diagram showing the structure of another embodiment of the terminal in the embodiment of the present invention, including:

 The first searching unit 301 is configured to search for a suitable cell from the cell with the dedicated priority according to the dedicated priority obtained by the data;

The second searching unit 302 is configured to: when the first searching unit 301 cannot find a suitable cell from the cell with the dedicated priority, according to the obtained common priority, from the cell with the public priority Find the right cell.

 Specifically, the second searching unit 302 may include: a searching unit 3021, configured to: when the first searching unit 301 cannot find a suitable cell from the cell with the dedicated priority, according to the obtained common priority, from all public Find the appropriate cell in the priority cell.

 As can be seen from the above, in this embodiment, when the terminal can find the suitable cell by using the dedicated priority, the terminal can directly use the common priority to search for thesuitable cell, so that the terminal does not need to find and camp on the Acceptable cell, and then finds the suitable from the Acceptable cell. The cell can find thesuitable cell relatively quickly, so that the terminal can enjoy the service faster and improve the user experience. In the meantime, the terminal does not need to look up and camp on the Acceptable cell in this embodiment, thereby preventing the terminal from accessing other PLMNs.

 FIG. 4 is a diagram showing the structure of another embodiment of the terminal in the embodiment of the present invention, including:

 The first searching unit 401 is configured to use the dedicated priority of the #home acquisition to find a suitable cell from the cell with the dedicated priority;

 The second searching unit 402 is configured to: when the first searching unit 401 cannot find a suitable cell from the cell with the dedicated priority, find a suitable cell from the cell with the common priority according to the acquired common priority.

 Specifically, the second searching unit 402 may include: a determining unit 4021, configured to determine, when the first searching unit 401 cannot find a suitable cell from the cell with the dedicated priority, from the cell having the common priority a dedicated priority cell; a searching unit 4022, configured to search for a suitable cell from all cells that do not have a dedicated priority determined by the determining unit 4021.

 As can be seen from the above, in this embodiment, when the terminal can find thesuitable cell by using the dedicated priority, the terminal can use the common priority to search for the suited cell, so that the terminal does not need to find and camp on the Acceptable cell, and then searches for thesuitable cell from the Acceptable cell. Therefore, thesuitable cell can be found relatively quickly, so that the terminal can enjoy the service faster and improve the user experience. At the same time, in this embodiment, the terminal does not need to find and camp on the Acceptable cell, thereby avoiding the terminal accessing other PLMNs.

An embodiment of the present invention further provides a communication system, which includes the terminal provided by the embodiment of the present invention, and the terminal can complete all the methods in the foregoing method embodiments. FIG. 5 illustrates a structure of an embodiment of a communication system, including a terminal 501 and a base station 502, wherein the number of base stations 502 is at least one, and the terminal 501 obtains the common priority of the cells corresponding to the base station 502 from the base station 502; or The terminal 501 obtains the common priority and the dedicated priority of the cell corresponding to the base station 502 from the base station 502. A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium, the program When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

 The cell reselection method, the terminal, and the communication system provided by the embodiments of the present invention are described in detail above. The description of the above embodiments is only for helping to understand the method and the idea of the present invention. Meanwhile, for those skilled in the art, The present invention is not limited by the scope of the present invention.

Claims

Rights request  A cell reselection method, characterized in that:  The terminal searches for a suitable cell from a cell with a dedicated priority according to the obtained dedicated priority;  If a suitable cell is not found from the cell having the dedicated priority, the terminal searches for a suitable cell from the cell having the common priority according to the acquired common priority.  2. The cell reselection method according to claim 1, wherein the step of searching for a suitable cell from the cell having the common priority comprises:  A cell having no dedicated priority is determined from the cells having the common priority, and then a suitable cell is searched from the cell having no dedicated priority.  The cell reselection method according to claim 1 or 2, wherein the terminal maintains a normal resident state when searching for a suitable cell from the cell having the public priority.  The cell reselection method according to claim 1 or 2, wherein the number of the cells having the common priority is at least two, and the at least two cells include:  At least two cells with different radio access technologies; or  At least two cells having different access frequencies; or  At least two cells with different access frequencies and different radio access technologies.  5. A computer program product, characterized in that said computer program product comprises computer program code, said computer program code enabling said computer to execute claims 1 to 4 when said computer program code is executed by a computer The steps of any of the items.  6. A computer readable storage medium, wherein the computer readable storage medium stores computer program code, the computer program code causing the computer to execute a right when the computer program code is executed by a computer Require the steps of any of items 1 to 4.  7. A terminal, comprising:  a first searching unit, configured to find a suitable cell from a cell with a dedicated priority according to the obtained dedicated priority; And a second searching unit, configured to: when the first searching unit cannot find a suitable cell from the cell with the dedicated priority, search for a suitable cell from the cell with the common priority according to the acquired common priority. The terminal according to claim 7, wherein the second searching unit comprises: a searching unit, configured to: when the first searching unit cannot find a suitable cell from a cell with a dedicated priority Finding a suitable cell from all cells with a common priority according to the acquired common priority.  The terminal according to claim 7, wherein the second searching unit comprises: a determining unit, configured to: when the first searching unit cannot find a suitable cell from a cell with a dedicated priority Determining a cell that does not have a dedicated priority from the cells having a common priority;  And a searching unit, configured to search for a suitable cell from all cells that do not have a dedicated priority determined by the determining unit.  A communication system, comprising the terminal according to any one of claims 7 to 9.