Timing advance techniques to manage cross link interference in 5G communication systems
Systems, methods, and apparatuses disclosed herein can mitigate interference in a wireless network. These systems, methods, and apparatuses can identify a mode of operation of a base station (BS) and can select a time advance (TA) that is associated with the identified mode of operation. These systems, methods, and apparatuses can advance signals on an uplink (UL) by the TA to cause the signals on the UL to be time aligned with other signals from other UEs on the UL at the BS to mitigate inter carrier interference (ICI) at the BS. Otherwise, these systems, methods, and apparatuses can advance the signals on the UL by the TA to cause the signals on the UL to be time aligned with signals from the BS on the DL at a victim UE within the wireless network to mitigate cross link interference (CLI) at the victim UE.
1 . A method for mitigating cross link interference (CLI) in a wireless network, the method comprising:
identifying, by a first user equipment (UE) within the wireless network, whether a base station (BS) within the wireless network is operating in a mode of operation selected from a group consisting of a static time division duplex (TDD) mode of operation, a sub-band full duplex (SBFD) mode of operation, or a dynamic TDD mode of operation;
selecting, by the first UE, a time advance (TA) that is associated with the identified mode of operation from among a plurality of TAs that are stored in the first UE, each of the plurality of TAs corresponding to one of the static TDD mode of operation, the SBFD mode of operation, or the dynamic TDD mode of operation;
advancing, by the first UE, timing of an uplink (UL) by the selected TA; and
transmitting, by the first UE, signals on the time advanced UL to the BS.
2 . The method of claim 1 , wherein the selecting comprises selecting the TA that is associated with the static TDD mode of operation; and
wherein the advancing comprises advancing timing of the UL by the first TA to cause the signals on the time advanced UL to be time aligned with other signals from other UEs received at the BS.
3 . The method of claim 1 , wherein the selecting comprises selecting the TA that is associated with the SBFD mode of operation or the dynamic TDD mode of operation, and
wherein the advancing comprises advancing timing of the UL by the TA to cause the signals on the time advanced UL to be time aligned with signals on a downlink (DL) from the BS at a second UE within the wireless network.
4 . The method of claim 1 , wherein the advancing comprises advancing timing of an UL frame by the selected TA.
5 . The method of claim 1 , further comprising receiving, by the first UE, the plurality of TAs from the BS on Layer 1 signaling.
6 . The method of claim 5 , wherein the Layer 1 signaling comprises Uplink Control Information (UCI).
7 . The method of claim 1 , further comprising receiving, by the first UE, the plurality of TAs from the BS on Layer 2 signaling.
8 . The method of claim 7 , wherein the Layer 2 signaling comprises a Random Access Response (RAR) having TA information or a Media Access Control-Control Element (MAC-CE).
9 . A first user equipment (UE), comprising:
a processor configured to:
identify whether a base station (BS) within a wireless network is operating in a mode of operation selected from a group consisting of a static time division duplex (TDD) mode of operation, a sub-band full duplex (SBFD) mode of operation, or a dynamic TDD mode of operation,
select a time advance (TA) that is associated with the mode of operation from among a plurality of TAs that are stored in the first UE, each of the plurality of TAs corresponding to one of the static TDD mode of operation, the SBFD mode of operation, or the dynamic TDD mode of operation, and
advance timing of an uplink (UL) by the selected TA; and
a transceiver, coupled to the processor, configured to transmit signals on the time advanced UL to the BS.
10 . The first UE of claim 9 , wherein the processor is configured to:
select the TA that is associated with the static TDD mode of operation; and
advance timing of the UL by the TA to cause the signals on the time advanced UL to be time aligned with other signals from other UEs received at the BS.
11 . The first UE of claim 9 , wherein the processor is configured to:
select the TA that is associated with the SBFD mode of operation or the dynamic TDD mode of operation; and
advance timing of the UL by the TA to cause the signals on the time advanced UL to be time aligned with signals on a downlink (DL) from the BS at a second UE within the wireless network.
12 . The first UE of claim 9 , wherein the processor is configured to advance timing of an UL frame by the selected TA.
13 . The first UE of claim 9 , wherein the transceiver is further configured to receive the plurality of TAs from the BS on Layer 1 signaling.
14 . The first UE of claim 13 , wherein the Layer 1 signaling comprises Uplink Control Information (UCI).
15 . The first UE of claim 9 , wherein the transceiver is further configured to receive the plurality of TAs from the BS on Layer 2 signaling.
16 . The first UE of claim 15 , wherein the Layer 2 signaling comprises a Random Access Response (RAR) having TA information or a Media Access Control-Control Element (MAC-CE).
17 . A first user equipment (UE), comprising:
a memory that stores a plurality of time advances (TAs), each of the plurality of TAs corresponding to one of a static time division duplex (TDD) mode of operation, a sub-band full duplex (SBFD) mode of operation, or a dynamic TDD mode of operation; and
a processor configured to:
select a TA that is associated with a mode of operation of a base station (BS) within a wireless network, the mode of operation being selected from a group consisting of the static TTD mode of operation, the SBFD mode of operation, or the dynamic TDD mode of operation,
advance timing of an uplink (UL) by the selected TA, and
transmit signals on the time advanced UL to the BS.
18 . The first UE of claim 17 , wherein the processor is configured to:
select the TA that is associated with the static TDD mode of operation; and
advance timing of the UL by the TA to cause the signals on the time advanced UL to be time aligned with other signals from other UEs received at the BS.
19 . The first UE of claim 17 , wherein the processor is configured to:
select the TA that is associated with the SBFD mode of operation or the dynamic TDD mode of operation; and
advance timing of the UL by the TA to cause the signals on the time advanced UL to be time aligned with signals on a downlink (DL) from the BS at a second UE within the wireless network.
20 . The first UE of claim 17 , wherein the processor is configured to:
receive the plurality of TAs from the BS on Layer 1 or Layer 2 signaling; and
store the received plurality of TAs in the memory.