Filter-based guardband determination and subcarrier selection
View Patent ↗Techniques for determining a guardband for a frequency channel based at least in part on a roll-off of a filter or a type of a filter are described herein. The filter may be a filter of a base station and the frequency channel may be used for transmissions from the base station to a mobile device. Alternatively, the filter may be a filter of a mobile device and the frequency channel may be used for transmissions from the mobile device to the base station. Further, because different filters of different mobile devices may have different roll-offs or types of filters, different guardbands may be determined for different mobile devices communicating over a same frequency channel. Upon determining the guardband, a base station may select a subcarrier based at least in part on the determined guardband.
1. A base station comprising:
one or more processors;
a radio communicatively coupled to the one or more processors, the radio including a filter associated with at least one of a filter type and a roll-off; and
a guardband determination module configured to be operated by the one or more processors to perform operations including:
determining the roll-off of the filter of the base station or the filter type of the filter of the base station;
determining a first guardband for a first frequency channel based at least in part on the roll-off of the filter of the base station or the filter type of the filter of the base station;
receiving, from a mobile device, an indication of a roll-off of a filter of the mobile device or a type of the filter of the mobile device; and
determining a second guardband for a second frequency channel based at least in part on the roll-off of the filter of the mobile device or the type of the filter of the mobile device.
2. The base station of claim 1 , wherein the filter is an adjacent channel interference filter.
3. The base station of claim 1 , further comprising a scheduler, wherein the guardband determination module is a component of the scheduler, and the scheduler is configured to be operated by the one or more processors to perform operations including:
selecting a first subcarrier for transmissions from the base station to the mobile device based at least in part on the determined first guardband for the first frequency channel;
selecting a second subcarrier for transmissions from the mobile device to the base station based at least in part on the determined second guardband for the second frequency channel; and
instructing the mobile device to utilize the selected second subcarrier.
4. The base station of claim 3 , wherein the scheduler is further configured to automatically reassign the mobile device to a different subcarrier based on an addition or a loss of a connection with another mobile device.
5. The base station of claim 1 , wherein at least one of the first guardband or the second guardband are determined based at least in part on a policy of a telecommunication network or a telecommunication standard.
6. The base station of claim 1 , wherein receiving the indication comprises receiving the indication in a specific field of a registration message or a connection message from the mobile device to the base station.
7. The base station of claim 1 , wherein the guardband determination module is further configured to maintain a default guardband used for a different mobile device when either or both of a roll-off or a type of filter of the different mobile device is unavailable.
8. The base station of claim 1 , wherein the guardband determination module is further configured to determine a different guardband to use for a different mobile device based on a roll-off or type of filter of the different mobile device.
9. One or more non-transitory computer-readable media having stored thereon a plurality of computer-executable instructions which, when executed by a base station of a telecommunication network, cause the base station to perform operations comprising:
receiving, from a mobile device, an indication of a roll-off of a filter of the mobile device or a type of the filter;
determining a guardband for a frequency channel based at least in part on the roll-off or the type of the filter, the determined guardband being specific to the mobile device;
selecting a subcarrier for transmissions from the mobile device to the base station based at least in part on the determined guardband; and
instructing the mobile device to utilize the selected subcarrier.
10. The one or more non-transitory computer-readable media of claim 9 , wherein the operations further comprise automatically reassigning the mobile device to a different subcarrier based on an addition or a loss of a connection with another mobile device.
11. The one or more non-transitory computer-readable media of claim 9 , wherein the operations further comprise determining a different guardband to use for a different mobile device based on a roll-off or type of filter of the different mobile device.
12. The one or more non-transitory computer-readable media of claim 11 , wherein the selected subcarrier occupies a part of the channel associated with the different guardband.
13. The one or more non-transitory computer-readable media of claim 9 , wherein receiving the indication comprises receiving the indication in a specific field of a registration message or a connection message from the mobile device to the base station.
14. The one or more non-transitory computer-readable media of claim 9 , wherein the operations further comprise maintaining a default guardband used for a different mobile device when either or both of a roll-off or a type of filter of the different mobile device is unavailable.
15. The one or more non-transitory computer-readable media of claim 9 , wherein the selecting comprises determining a portion of a channel to be available for subcarrier selection based at least in part on the determined guardband and selecting a subcarrier within the available portion of the channel.
16. A method comprising:
providing, by a mobile device, an indication of a roll-off of a filter of the mobile device or a type of the filter to a base station of a telecommunication network;
receiving, by the mobile device, instructions from the base station to utilize a subcarrier on a frequency range of a channel for transmissions from the mobile device to the base station, the frequency range being used for mobile devices that have roll-offs or types of filters which meet one or more criteria.
17. The method of claim 16 , wherein the providing comprises providing the indication of the roll-off or the type of the filter in a specific field of a registration message or a connection message.
18. The method of claim 16 , wherein the frequency range is reserved as a guardband portion of the channel applicable to other mobile devices that have roll-offs or types of filters which do not meet one or more criteria.
19. The method of claim 18 , further comprising listening to a different channel used for communications from the base station to the mobile device, including listening to a guardband portion of the different channel, in response to instructions from the base station to tune to different channel.