Smart UE cell selection and reselection
地域：
WA
WA Bellevue
摘要
System and methods for smart cell selection and reselection are described. A mobile device may attempt to camp on a cell in a tracking area that has advertised a particular frequency band. If the mobile device is unable to recognize an information element identifying a different subset of the advertised frequency band than that supported by the mobile device, the mobile device will store a record of the tracking area and the advertised frequency band and compare future cell information broadcasts to the entry, avoiding attempts to operate within cells in the same tracking area advertising the same frequency. In this way the mobile device conserves resources by avoiding actions in incompatible cells and avoids storing information about many cells by only storing the tracking area information.
說明書
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With the rapid growth in the number of wireless communications devices (e.g., user devices such as mobile telephones, smartphones, tablets, laptops, etc.) in use, the networks that provide services to such devices have grown to accommodate them. Along with a large increase in the number of network devices deployed to provide services to user devices, the bandwidth available for providing such services has also expanded. However, there are many user devices that are unable to communicate on newly introduced bands that may be available to a user device in a wireless network. Efficiently supporting these legacy devices while concurrently supporting devices configured to operate on relatively newly available bands on current networks may pose a challenge for a network operator.
The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same reference numbers in different figures indicate similar or identical items.
權(quán)利要求
What is claimed is:1. A method performed by a mobile device, the method comprising:receiving a first system information block from a first base station, the first system information block indicating a first cell, a first tracking area, and a first frequency band; initiating first communications operations in the first cell based at least in part on the first frequency band; determining that initiating the first communications operations in the first cell was unsuccessful; based at least in part on determining that initiating the first communications operations in the first cell was unsuccessful, storing an indicator of the first tracking area and an indicator of the first frequency band in a memory of the mobile device; receiving a second system information block from a second base station, the second system information block indicating a second cell, a second tracking area, and a second frequency band; determining that the second tracking area corresponds to the first tracking area based at least in part on the indicator of the first tracking area; determining that the second frequency band corresponds to the first frequency band based at least in part on the indicator of the first frequency band; based at least in part on determining that the second tracking area corresponds to the first tracking area and that the second frequency band corresponds to the first frequency band, determining to refrain from initiating second communications operations in the second cell; and maintaining the indicator of the first tracking area and the indicator of the first frequency band in the memory of the mobile device until changing an airplane mode status of the mobile device or until power cycling the mobile device. 2. The method of claim 1 , wherein initiating the first communications operations in the first cell based at least in part on the first frequency band comprises determining that the first system information block comprises an unrecognized information element. 3. The method of claim 2 , wherein:the unrecognized information element indicates a second subset of frequencies within the first frequency band within which the first cell operates; and the second subset of frequencies is distinct from a first subset of frequencies within which the mobile device operates. 4. The method of claim 2 , wherein storing the indicator of the first tracking area and the indicator of the first frequency band is further based at least in part on determining that the first system information block comprises the unrecognized information element. 5. The method of claim 1 , wherein the first cell is a distinct cell from the second cell. 6. The method of claim 5 , wherein the first base station is a same base station as the second base station. 7. A mobile device comprising:one or more processors; one or more transceivers; and non-transitory computer-readable media storing computer-executable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations comprising:receiving a system information block from a base station, the system information block indicating a cell, a tracking area, and a frequency band; determining that the tracking area corresponds to a tracking area identifier stored in the non-transitory computer-readable media; determining that the frequency band corresponds to a frequency band identifier stored in the non-transitory computer-readable media; based at least in part on determining that the tracking area corresponds to the tracking area identifier and that the frequency band corresponds to the frequency band identifier, determining to refrain from initiating communications operations in the cell; and maintaining the tracking area identifier and the frequency band identifier from in the non-transitory computer-readable media until changing an airplane mode status of the mobile device or until power cycling the mobile device. 8. The mobile device of claim 7 , wherein the operations further comprise:receiving a second system information block from a second base station, the second system information block indicating a second cell, a second tracking area, and a second frequency band; at least one of:determining that the second tracking area does not correspond to at least one of one or more tracking area identifiers stored in the non-transitory computer-readable media, or determining that the second frequency band does not correspond to at least one of one or more frequency band identifiers stored in the non-transitory computer-readable media; and based at least in part on determining that the second tracking area does not correspond to at least one of the one or more tracking area identifiers or that the second frequency band does not correspond to at least one of the one or more frequency band identifiers, initiating second communications operations in the second cell. 9. The mobile device of claim 7 , wherein the system information block further indicates a frequency sub-band within which the mobile device is not configured to operate. 10. The mobile device of claim 7 , wherein:the base station operates the cell using a first subset of frequencies within the frequency band; the mobile device performs the communications operations using a second subset of frequencies within the frequency band; and the second subset of frequencies is distinct from the first subset of frequencies. 11. The mobile device of claim 10 , wherein:the frequency band is associated with an n77 band; the first subset of frequencies is associated with a DoD band; and the second subset of frequencies is associated with a C-band. 12. The mobile device of claim 7 , wherein the operations further comprise:detecting a change of a condition of the mobile device; and based at least in part on detecting the change of the condition, deleting the tracking area identifier and the frequency band identifier from the non-transitory computer-readable media. 13. A non-transitory computer-readable media storing computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:receiving a system information block from a first base station, the system information block indicating a first cell, a first tracking area, a first frequency band, and a first frequency sub-band; determining that an information element representing the first frequency sub-band in the first system information block is not recognized; based at least in part on determining that the information element representing the first frequency sub-band is not recognized, storing an indicator of the first tracking area and an indicator of the first frequency band, in memory associated with the one or more processors; determining to refrain from initiating communications operations in a second cell based at least in part on:determining that a second tracking area associated with the second cell corresponds to the first tracking area, or determining that a second frequency band associated with the second cell corresponds to the first frequency band; maintaining the indicator of the first tracking area and the indicator of the frequency band in the memory until changing an airplane mode status of a device associated with the memory or until power cycling the device. 14. The non-transitory computer-readable media of claim 13 , wherein the operations further comprise determining to initiate second communications operations in a third cell based at least in part on determining at least one of:a third tracking area associated with the third cell does not correspond to the first tracking area; or a third frequency band associated with the third cell does not correspond to the first frequency band. 15. The non-transitory computer-readable media of claim 13 , wherein the first base station operates the first cell using the first frequency sub-band that is distinct from a second frequency sub-band used to perform the communications operations. 16. The non-transitory computer-readable media of claim 13 , wherein the first cell is a distinct cell from the second cell. 17. The non-transitory computer-readable media of claim 13 , wherein determining to refrain from initiating the communications operations in the second cell is further based at least in part on receiving a second system information block indicating the second tracking area and the second frequency band. 18. The non-transitory computer-readable media of claim 13 , wherein the operation further comprise:detecting a change of a condition of a mobile device; and based at least in part on detecting the change of the condition, deleting the indicator of the first tracking area and the indicator of the first frequency band.
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