Flexible frequency band pairing for satellite communications
This document describes techniques for flexible frequency band pairing for satellite communications. In aspects, a non-terrestrial communication system uses multiple frequency bands for a wireless link between a user equipment, UE, and a satellite of the non-terrestrial communication system. The non-terrestrial communication system determines to utilize two different frequency bands the wireless link between the satellite and the UE, the two different frequency bands being defined by a governing entity. In response, the non-terrestrial based communication system selects a first defined frequency band for downlink communications from the satellite to the UE and a second defined frequency band for uplink communications from the UE to the satellite. The non-terrestrial communication system then directs the satellite and the UE to communicate via the wireless link by using the first defined frequency band for the downlink communications and the second defined frequency band for the uplink communications.
1 . A method performed by a device in a non-terrestrial communication system, the method comprising:
determining to utilize two different frequency bands defined by a governing entity for a wireless link between a user equipment (UE) and a satellite of the non-terrestrial communication system;
selecting a first frequency band among the two different frequency bands for downlink communications from the satellite to the UE, the first frequency band that is classified by the governing entity as a bidirectional frequency band being used as a unidirectional frequency band, and having a first power spectral density limitation higher than a second power spectral density limitation of a second frequency band among the two different frequency bands, the first and second power spectral density limitation being specified by the governing entity in usage rules; and
directing the satellite and the UE to communicate via the wireless link by using the first frequency band for the downlink communications to the UE.
2 . The method as recited in claim 1 , wherein the directing the satellite and the UE to communicate via the wireless link by using the first frequency band for the downlink communications comprises at least one of:
directing the satellite and the UE to only use a downlink portion or an uplink portion of a frequency division duplex (FDD) bidirectional frequency band as the unidirectional frequency band; or
directing the satellite and the UE to use only a downlink portion or an uplink portion of a time division duplex (TDD) bidirectional frequency band as the unidirectional frequency band.
3 . The method as recited in claim 1 , further comprising:
receiving a request from the UE to utilize the two different frequency bands for the wireless link, wherein the determining to utilize the two different frequency bands is in response to the receiving the request.
4 . The method as recited in claim 3 , further comprising:
analyzing the assistance information included in the request received from the UE, wherein the determining to utilize the two different frequency bands is based on the analyzing the assistance information that conveys at least one of: UE-observed metrics, UE mobility characteristics, UE received signal quality, or a UE-suggested first and second frequency band.
5 . The method as recited in claim 1 , wherein the directing the satellite and the UE to communicate via the wireless link by using the first frequency band for the downlink communications comprises:
directing the satellite and the UE to use, as the first frequency band, a frequency band classified by the governing entity for supplementary downlink communications.
6 . A method performed by a user equipment (UE), for communicating via a wireless link with a satellite in a non-terrestrial communication system, the method comprising:
transmitting, to a device in the non-terrestrial communication system, a request to utilize the two different frequency bands defined by a governing entity, for the wireless link;
receiving, from the device in the non-terrestrial communication system, directions to utilize two different frequency bands for the wireless link between the UE and the satellite, the directions requiring the UE to utilize a first frequency band among the two different frequency bands that is defined as a bidirectional frequency band, as an unidirectional frequency band, and having a first power spectral density limitation higher than a second power spectral density limitation of a second frequency band among the two different frequency bands, the first and second power spectral density limitation being specified by the governing entity in usage rules; and
communicating with the satellite via the wireless link by using the first frequency band for downlink communications over the wireless link and a second frequency band among the two different frequency bands that is different from the first frequency band for uplink communications.
7 . The method as recited in claim 6 , wherein the receiving directions comprises:
receiving directions to utilize only a downlink portion or an uplink portion of a frequency division duplex (FDD) bidirectional frequency band as the unidirectional frequency band; or
receiving directions to utilize only a downlink portion or an uplink portion of a time division duplex (TDD) bidirectional frequency band as the unidirectional frequency band.
8 . The method as recited in claim 6 , wherein the request includes assistance information that conveys at least one of: UE-observed metrics, UE mobility characteristics, UE received signal quality, or a UE-suggested first and second frequency band.
9 . The method as recited in claim 6 , wherein the receiving the directions comprises:
receiving directions to utilize, as the second frequency band, a frequency band classified by the governing entity for supplementary uplink communications.
10 . An apparatus in a non-terrestrial communication system, comprising:
a wireless transceiver;
a processor; and
computer-readable storage media comprising instructions that, responsive to execution by the processor, direct the apparatus to:
determine to utilize two different frequency bands for a wireless link between a user equipment (UE) and a satellite of the non-terrestrial communication system;
select a first frequency band among the two different frequency bands for downlink communications from a satellite to the UE, the first frequency band that is classified by a governing entity as a bidirectional frequency band being used as a unidirectional frequency band, and having a first power spectral density limitation higher than a second power spectral density limitation of a second frequency band among the two different frequency bands, the first and second power spectral density limitation being specified by the governing entity in usage rules; and
direct the satellite and the UE to communicate via the wireless link by using the first frequency band for the downlink communications.
11 . The apparatus of claim 10 , wherein the instructions to direct the satellite and the UE to communicate via the wireless link by using the first frequency band for the downlink communications further direct the apparatus to:
direct the satellite and the UE to only use a downlink portion or an uplink portion of a frequency division duplex (FDD) bidirectional frequency band as the unidirectional frequency band; or
direct the satellite and the UE to use only a downlink portion or an uplink portion of a time division duplex (TDD) bidirectional frequency band as the unidirectional frequency band.
12 . The apparatus of claim 10 , wherein the instructions further direct the apparatus to receive a request from the UE to utilize the two different frequency bands for the wireless link, wherein the apparatus determines to utilize the two different frequency bands in response to receiving the request.
13 . The apparatus of claim 10 , wherein the instructions further direct the apparatus to analyze assistance information from the UE, wherein the apparatus determines to utilize the two different frequency bands in response to analyzing the assistance information that conveys at least one of: UE-observed metrics UE mobility characteristics, UE received signal quality, or a UE-suggested first and second frequency band.
14 . The apparatus of claim 10 , wherein the instructions to direct the satellite and the UE to communicate are further executable to direct the apparatus to:
direct the satellite and the UE to use, as the first frequency band, a frequency band classified by the governing entity for supplementary downlink communications.
15 . A user equipment (UE) comprising:
a wireless transceiver;
a processor; and
computer-readable storage media comprising instructions that, responsive to execution by the processor, direct the UE to communicate via a wireless link with a satellite in a non-terrestrial communication system including to:
transmit, to a device in the non-terrestrial communication system, a request to utilize the two different frequency bands defined by a governing entity, for the wireless link;
receive, from the device in a non-terrestrial communication system, directions to utilize two different frequency bands for a wireless link between the UE and the satellite, the directions requiring the UE to utilize a first frequency band among the two different frequency bands that is defined as a bidirectional frequency band, as an unidirectional frequency band, and having a first power spectral density limitation higher than a second power spectral density limitation of a second frequency band among the two different frequency bands, the first and second power spectral density limitation being specified by the governing entity in usage rules; and
communicate with the satellite via the wireless link by using the first frequency band for downlink communications over the wireless link and a second frequency band that is different from the first frequency band for uplink communications.
16 . The UE of claim 15 , wherein the instructions to receive directions are further executable to direct the UE to:
receive directions to utilize only a downlink portion or an uplink portion of a frequency division duplex (FDD) bidirectional frequency band as the unidirectional frequency band; or
receive directions to utilize only a downlink portion or an uplink portion of a time division duplex (TDD) bidirectional frequency band as the unidirectional frequency band.
17 . The UE of claim 15 , wherein the request includes assistance information that conveys at least one of: UE-observed metrics, UE mobility characteristics, UE received signal quality, or a UE-suggested first and second frequency band.
18 . The UE of claim 15 , wherein the instructions to receive directions are further executable to direct the UE to:
receive directions to utilize, as a second frequency band, a frequency band classified by the governing entity for supplementary uplink communications.
19 . The method as recited in claim 8 , further comprising:
determining the UE-suggested first and second frequency band based on UE-observed metrics, UE mobility characteristics, UE received signal quality, and/or UE operational conditions.
20 . The UE of claim 17 , wherein the instructions further direct the UE to:
determine the UE-suggested first and second frequency band based on UE-observed metrics, UE mobility characteristics, UE received signal quality, and/or UE operational conditions.