TWI535309B - Method and communication device of managing closed subscriber group cell selection - Google Patents

Description

Method and communication device for managing closed user group cell selection

The invention relates to a method and a communication device for a wireless communication system, in particular to a method and a communication device for managing cell selection of a closed user group in a wireless communication system.

System Architecture Evolution (SAE) system, standardized by the 3rd Generation Mobile Communications Alliance (3GPP), is a new core network architecture in the Universal Mobile Telecommunications System (UMTS), which is the Internet. The mass market of the Internet Protocol (IP) provides cost-effective deployment and operation. The network evolution mainly includes satisfying the wireless interface requirements of a long term evolution (LTE) system, simplifying the network structure, and all-IP networks (that is, all services are transmitted by using packet switching, without including circuit switching technology), and Supports continuity between different types of access networks, operations and services, such as between 2G/3G, Long Term Evolution, and non-3GPP access systems.

The system architecture evolution system includes a Mobility Management Entity (MME), a Serving Gateway, and a PDN Gateway. The mobile management system is a control plane unit that manages network service attach, client authentication, and coordination of the establishment of associated wireless bearers for the evolved wireless access network.

The function of the system architecture evolution system includes a non-access-strata (NAS) function performed by the UE in the idle mode, and an evolved universal mobile communication system is communicated between the UE and the evolved packet core network. The non-access layer signaling procedure performed by Evolved UMTS (E-UTRAN) and the Layer 3 signaling flow transmitted between the UE and the evolved packet core network through the non-3GPP access network.

In the non-access layer, the Home Cell deployment is defined as a single base The station is used in a building or a small cell group, such as in a campus. Eligibility for access to a particular cell is limited to a particular subscription user. In the deployment of a unique cell, a Closed Subscriber Group (CSG) cell can be considered as one of the types of a particular cell, which is part of a Public Land Mobile Network (PLMN). When the cell identification of the closed user group cell is stored in a whitelist of a client, the client can access the closed user group cell. In other words, the whitelist provides cell identification for a plurality of closed user group cells that are accessible, allowing the client to be allowed to reside within the service of the closed user group cells provided by the whitelist. In general, the whitelist is determined by the public mobile network.

In the current third-generation mobile communication alliance specification, it is not clear that it is a whitelist. There is at least one accessible CSG cell, but the client should only handle this condition when the client only finds a suitable large cell and does not find any CSG cells. Therefore, the UE cannot select a CSG cell for access, resulting in a decrease in communication quality.

In addition, in terms of service provision, the service access fee of a CSG cell is lower than that of a large The service access fee of the cells is such that when the user selects a cell, the user is preferentially selected to select a CSG cell. In order to save the user's service access costs, in a cell selection procedure, CSG cells should have a higher priority order than other cells, such as large cells.

In a manual CSG cell selection function, the user can provide a manual function for the user to initiate CSG cell search and select a CSG cell. Since the network side wants the UE to select cells according to the result of one cell selection or cell reselection, the network may stop this manual function. However, current specifications do not provide a means to effectively control the initiation of manual CSG cell selection.

On the other hand, a user may not normally activate the manual CSG cell selection function. For example, in a manual CSG cell selection, the user selects a CSG cell that is not permitted to access (e.g., one of the other users' proprietary base stations). When the client attempts to access an unlicensed CSG cell, the specification provides a service request rejection procedure with a specific rejection reason value. However, the service request rejection procedure involves the client and the action management entity. Base station and action management entity A link is established and the action management entity checks whether the client has access to the CSG cell. This method wastes the wireless resources and the network end resources in the process of processing whether the user terminal accesses incorrectly, thereby reducing the performance of the client accessing the CSG cells.

The invention provides a method and a communication device for managing cell selection of a closed user group in a user terminal of a wireless communication system.

The present invention discloses a method for appropriately managing a closed subscriber group cell selection in a client of a wireless communication system, wherein the client includes a whitelist for providing a plurality of whitelists. A closed user group cell that can be accessed, the method comprising: determining a manually closed user group cell according to a flag stored in a Subscriber Identity Module (SIM) of the client Select whether the function is activated or not.

The invention further discloses a communication device for a wireless communication system for appropriately managing a closed subscriber group cell selection, the communication device comprising: a computer readable recording medium for storing One of the processing methods, a whitelist, which is used to provide a plurality of closed user group cells for access, and a flag stored in a Subscriber Identity Module (SIM). And a processor coupled to the computer readable recording medium for processing the code to execute the processing method, the processing method comprising: determining a manual closure according to the flag Whether the user group cell selection function is activated or not.

10‧‧‧Wireless communication system

100‧‧‧ Client

100‧‧‧Community mobile network

112‧‧‧ Large cells

114‧‧‧Wireless access network

20‧‧‧Communication device

200‧‧‧ processor

210‧‧‧Computer-readable recordable media

220‧‧‧Communication interface unit

214‧‧‧ Code

216‧‧ white list

F1, F2‧‧‧ flag

30, 40, 50‧‧‧ Process

300, 302, 304, 306, 400, 402, 404, 406, 500, 502, 504 ‧ ‧ steps

Figure 1 is a schematic diagram of a wireless communication system.

FIG. 2 is a schematic diagram of a communication device according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing the selection process of a specific cell according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a cell selection management process according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of another cell selection management process according to an embodiment of the present invention.

Please refer to FIG. 1 , which is a schematic diagram of a wireless communication system 10 . The architecture of the wireless communication system 10 is based on a System Architecture Evolution (SAE), which includes a client 100 and a Public Land Mobile Network (PLMN) 110. The architecture of PLMN 110 is well known to those of ordinary skill in the art and will not be described here. When the client 100 resides in one of the macro cells 112 of the Radio Access Network (RAN) 114 of the PLMN 110, the PLMN 110 may determine a white list of the client 100, which provides a plurality of Closed Subscriber Group (CSG) cells are available for access. The CSG cells can be viewed as special cells that allow the client 100 to access and are provided by a proprietary network. The client 100 searches for appropriate CSG cells based on the whitelist to access the CSG service. The above wireless access network may be a global mobile communication system/enhanced data rate GSM EDGE Radio Access Network (GERAN), a universal mobile radio access network (UMTS RAN, UTRAN) or A wireless access network for a Long Term Evolution (LTE) system.

Please refer to FIG. 2 , which is a schematic diagram of a wireless communication device 20 according to an embodiment of the present invention. The wireless communication device 20 can be the client 100 in FIG. 1 and includes a processor 200, a computer readable recording medium 210, and a communication interface unit 220. The computer readable recording medium 210 can be any and not limited to a data storage device for storing a code 214 and other stored data, and is read and processed by the processor 200. The computer readable recording medium 210 may include at least one of the following: a Subscriber Identity Module (SIM), a read-only memory (ROM), a flash memory, and a random Access-memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, or carrier signals (such as Internet data transmission). The communication interface unit 220 is preferably a wireless receiver for wireless communication with the base station.

The stored data in the computer readable recording medium 210 includes a white list 216. And flags F1 and F2. The whitelist 216 can provide a plurality of CSG cells for access, the number of which is set by the network. When the communication device 20 resides in a large cell of a particular network, it can search for CSG cells through the whitelist 216 to obtain the CSG service.

The flag F1 is used to store a specific cell (such as CSG cells) or large cells. At least one of the two is prioritized for cell selection. In this case, embodiments of the present invention provide a unique cell selection process to allow the user to select a particular cell or a large cell. Please refer to FIG. 3, which is a schematic diagram of a specific cell selection process 30 according to an embodiment of the present invention. The unique cell selection process 30 is for storing a whitelist in a client for managing CSG cell selection and compiling to program code 214. The unique cell selection process 30 includes the following steps: Step 300: Start.

Step 302: When the white list is not blank, a flag is read for cell selection, wherein the flag stores a priority information about at least one of a particular cell or a large cell.

Step 304: Select a specific cell or a large cell according to the flag.

Step 306: End.

According to the unique cell selection process 30, when the white list contains at least one CSG cell, the client reads a flag and selects a CSG cell or a large cell based on the flag. In the case of the communication device 20 executing the unique cell selection process 30, the flag is the flag F1, which is the white list 216. The flag F1 and the white list 216 can be stored in the user identification module of the communication device 20 or the cache memory (all part of the computer readable recording medium 210), and when the communication device 20 is powered on, the white list can be 216 is stored in random access memory.

It is worth noting that the priority information of the above embodiments includes information about a particular cell, a large cell, or a combination of a specific gene and a large cell. For example, the flag can be set to "CSG only" and "CSG". One of the "cell priority", "large cell priority", and "no priority". When the flag is set to "CSG only", the client can only select one CSG cell to reside. When the flag is set to "CSG cell priority", when selecting a cell, the client first searches for a CSG in the white list. The cells reside. If the client cannot find any CSG cells in the whitelist, but finds a large cell, the client selects the large cell to reside. When the flag is set to "large cell priority", when selecting cells, the client preferentially searches for a large cell resident. If the client cannot find any large cells in the whitelist but finds a CSG cell in the whitelist, the client selects the CSG cell to reside. When the flag is set to "no priority", when selecting cells, the client can select any CSG cell or a large cell to reside in the whitelist.

Preferably, the flag can be updated by a user or updated according to a dedicated signaling message. The dedicated signaling message is transmitted by the network station where the client is located. In addition, the dedicated signaling message can be a short message service message.

The client can use a manual CSG cell selection function. The embodiment of the invention provides a fine The cell selects the management process to avoid system errors caused by improperly launching the manual CSG cell selection function. Please refer to FIG. 4, which is a schematic diagram of a cell selection management process 40 according to an embodiment of the present invention. The cell selection management process 40 is used to store one of the whitelists in the client for managing CSG cell selections and can be compiled into the code 214. The cell selection management process 40 includes the following steps: Step 400: Start.

Step 402: Read a flag.

Step 404: Determine, according to the flag, whether the manual special cell selection function is activated or not.

Step 406: End.

According to the cell selection management process 40, when necessary (such as when the power is turned on), the client reads the flag and determines whether to activate the manual CSG cell selection function according to the flag. If the user decides to activate the manual CSG cell selection function according to the flag, then when the user searches for more than one CSG cell existing in the white list, the user can manually select any CSG cell. In contrast, if the client decides not to activate the manual CSG cell selection function, the user will not be able to manually select the CSG cells. Taking the communication device 20 of FIG. 2 as an example, the flag in the cell selection management process 40 can be the flag F2, and the manual CSG cell selection function is determined to be the white list 216 used after the startup. The flag F2 and the white list 216 can be stored in the user identification of the communication device 20. The module or cache memory (all part of the computer readable recording medium 210) is included, and when the communication device 20 is powered on, the white list 216 can be stored in the random access memory.

In addition, the flag may be updated according to a dedicated signaling message transmitted by the network station where the client is located, and the dedicated signaling message may be a short message service message.

Through the cell selection management process 40, the network can control the user to enable or disable the manual CSG cell selection function by updating the flag setting.

When the manual CSG cell selection function is activated, the client can search for CSG cells outside the whitelist. In this case, the embodiment of the present invention provides a cell selection management process to help the network side manage the manual CSG cell selection function of the user end. Please refer to FIG. 5. FIG. 5 is a schematic diagram of a cell selection management process 50 according to an embodiment of the present invention. The cell selection management process 50 is used to store a whitelist in a client to manage CSG cell selection and to compile into code 214. The cell selection management process 50 includes the following steps: Step 500: Start.

Step 502: When a CSG cell that does not belong to the white list is selected, the manual CSG cell selection function is terminated.

Step 504: End.

According to the cell selection management process 50, when the client selects a CSG cell that does not belong to the white list, the manual CSG cell selection function is terminated. In other words, selecting an operation that does not belong to any of the CSG cells of the white list will trigger the client to terminate the manual CSG cell selection function.

In the prior art, a serving base station of a CSG cell is a part of the network side, and performs a specific procedure with a Mobility Management Entity (MME) to terminate CSG cell selection. Through the cell selection management process 50, the embodiment of the present invention clearly states that when the selected CSG cells are not whitelisted, the user can actively terminate the manual CSG cell selection function, thereby avoiding the processing between the service base station and the action management entity of the CSG cells. The program that the client is erroneously accessed, and the startup that prevents the CSG cell selection function from being abnormal.

In summary, the embodiments of the present invention provide a user with a better CSG cell service function and improve the control function of the manual CSG cell selection function.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

40‧‧‧ Process

400, 402, 404, 406‧ ‧ steps

Claims (10)

A method for appropriately managing a closed subscriber group cell selection in a client of a wireless communication system, wherein the client includes a whitelist for providing a plurality of available Accessing the closed user group cell, the method includes: determining a manually closed user group cell selection function according to a flag stored in a Subscriber Identity Module (SIM) of the user terminal Start or not. The method of claim 1, further comprising: when the closed user group cell selection function is activated, when the user searches for more than one closed user group cell existing in the white list, manually Select any of the closed user group cells. The method of claim 1, further comprising: when the closed user group cell selection function is activated, when the user searches for closed user group cells that do not exist in the white list and selects any one of them The manual closed user group cell selection function is terminated when there are no closed user group cells in the white list. The method of claim 1, wherein the flag is updated according to a dedicated signaling message transmitted by a network of one of the wireless communication systems. The method of claim 4, wherein the dedicated signaling message is a short message service message. A communication device for a wireless communication system for appropriately managing a closed subscriber group cell selection, the communication device comprising: a computer readable recording medium for storing a processing method a code, a whitelist for providing a plurality of closed user group cells for access, and a flag stored in a Subscriber Identity Module (SIM); And a processor coupled to the computer readable recording medium for processing the code to execute The processing method includes: determining, according to the flag, whether a manually closed user group cell selection function is activated or not. The communication device of claim 6, wherein the processing method further comprises: when the closed user group cell selection function is activated, when the communication device searches for more than one closed user existing in the white list When grouping cells, manually select any of the closed user group cells. The communication device of claim 6, wherein the processing method further comprises: when the closed user group cell selection function is activated, when the communication device searches for a closed user group cell that does not exist in the whitelist And the manual closed user group cell selection function is terminated when any of the closed user group cells not present in the white list is selected. The communication device of claim 6, wherein the flag is updated according to a dedicated signaling message transmitted by a network end of the wireless communication system in which the communication device is located. The communication device of claim 9, wherein the dedicated signaling message is a short message service message.