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;
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; and
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.
2. The base station of claim 1 , wherein the filter is an adjacent channel interference filter.
3. The base station of claim 1 , wherein the second guardband is different for other mobile devices that have other roll-offs or other types of filters.
4. 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.
5. The base station of claim 1 , wherein the guardband determination module is configured to be operated by the one or more processors 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.
6. The base station of claim 5 , wherein the selected second subcarrier occupies a part of the second frequency channel associated with the different guardband.
7. 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.
8. The base station of claim 1 , wherein the scheduler is configured to be operated by the one or more processors to automatically reassign the mobile device to a different subcarrier based on an addition or a loss of a connection with another 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:
determining a roll-off of a filter of the base station 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; and
selecting a subcarrier for transmissions from the base station to a mobile device based at least in part on the determined guardband for the frequency channel, 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 the subcarrier within the available portion of the channel.
10. The one or more non-transitory computer-readable media of claim 9 , wherein the selected subcarrier is associated with a part of spectrum maintained as a guardband in the absence of a filter roll-off or a filter type meeting one or more criteria.
11. The one or more non-transitory computer-readable media of claim 9 , wherein the operations further comprise:
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;
determining whether the roll-off of the filter of the mobile device or the type of the filter of the mobile device meets one or more criteria;
determining a guardband for a different frequency channel based at least in part on whether the roll-off of the filter of the mobile device or the type of the filter of the mobile device meets the one or more criteria; and
instructing the mobile device to utilize a subcarrier for transmissions from the mobile device to the base station, the subcarrier for transmissions from the mobile device being selected based at least in part on the determined guardband for the different frequency channel.
12. The one or more non-transitory computer-readable media of claim 9 , wherein no subcarriers are selected in the guardband portion of a channel.
13. A method implemented by a base station of a telecommunication network, comprising:
determining a roll-off of a filter of the base station 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; and
selecting a subcarrier for transmissions from the base station to a mobile device based at least in part on the determined guardband for the frequency channel, 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 the subcarrier within the available portion of the channel.
14. The method of claim 13 , wherein the selected subcarrier is associated with a part of spectrum maintained as a guardband in the absence of a filter roll-off or a filter type meeting one or more criteria.
15. The method of claim 13 , further 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 of the mobile device;
determining whether the roll-off of the filter of the mobile device or the type of the filter of the mobile device meets one or more criteria;
determining a guardband for a different frequency channel based at least in part on whether the roll-off of the filter of the mobile device or the type of the filter of the mobile device meets the one or more criteria; and
instructing the mobile device to utilize a subcarrier for transmissions from the mobile device to the base station, the subcarrier for transmissions from the mobile device being selected based at least in part on the determined guardband for the different frequency channel.
16. The method of claim 13 , wherein no subcarriers are selected in the guardband portion of a channel.