Controlling AUL transmissions when coexisting with scheduled UEs
Systems and methods are disclosed herein for restricting autonomous uplink transmissions by a wireless device in a wireless communication system such that wireless devices performing autonomous uplink transmissions can coexist with wireless devices performing scheduled uplink transmissions in a cell requiring Listen-Before-Talk (LBT). In some embodiments, a method of operation of a wireless device in a wireless communication system comprises receiving, from a radio access node, an indication of which subframes belong to a same channel occupancy within a cell that requires LBT and restricting performance of autonomous uplink transmissions by the wireless device based on the indication of which subframes belong to the same channel occupancy. By restricting autonomous uplink transmissions in this manner, the wireless device can coexist with scheduled wireless devices in the same cell.
1 . A method of operation of a wireless device in a wireless communication system, comprising:
receiving, from a radio access node, an indication of subframes belonging to a same channel occupancy within a cell that requires Listen-Before-Talk, LBT,
wherein the method further comprises:
receiving, from the radio access node, an indication that the wireless device is allowed to perform uplink transmissions without a dynamic uplink, UL, grant during any of the subframes that belong to the same channel occupancy or during a subset of the subframes that belong to the same channel occupancy; and
restricting performance of uplink transmissions by the wireless device based on the indication of subframes belonging to the same channel occupancy and that the wireless device is allowed to perform uplink transmission without a dynamic UL grant during any of the subframes that belong to the same channel occupancy or during the subset of the subframes that belong to the same channel occupancy.
2 . The method of claim 1 wherein:
receiving the indication comprises receiving a Common Physical Downlink Control Channel, C-PDCCH, that comprises the indication, wherein the indication comprises an indication of a scheduled uplink burst duration;
the method further comprises receiving, from the radio access node, the indication that the wireless device is allowed to perform uplink transmissions during any subframe or a subset of the subframes from a subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration; and
restricting the performance of uplink transmissions by the wireless device comprises avoiding uplink transmissions by the wireless device in accordance with the indication that the wireless device is allowed to perform uplink transmissions during any subframe or the subset of the subframes from the subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration.
3 . The method of claim 2 wherein the indication that the wireless device is allowed to perform uplink transmissions during any subframe or the subset of the subframes from the subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration is comprised in the C-PDCCH.
4 . The method of claim 2 wherein the indication that the wireless device is allowed to perform uplink transmissions during any subframe or the subset of the subframes from the subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration is a 1 bit indication comprised in the C-PDCCH.
5 . The method of claim 1 wherein restricting the performance of uplink transmissions by the wireless device comprises avoiding uplink transmissions by the wireless device from a subframe in which the indication was received up until an end of the channel occupancy.
6 . The method of claim 1 wherein:
receiving the indication comprises receiving a Common Physical Downlink Control Channel, C-PDCCH, that comprises the indication, wherein the indication comprises an indication of an uplink burst duration; and
restricting the performance of uplink transmissions by the wireless device comprises avoiding uplink transmissions by the wireless device from a subframe in which the C-PDCCH was received up until an end of the uplink burst duration.
7 . The method of claim 1 wherein:
receiving the indication comprises receiving the indication in a subframe n and an indication of an offset of a start of the channel occupancy from the subframe n; and
restricting the performance of uplink transmissions by the wireless device comprises avoiding uplink transmissions by the wireless device from a subframe n+Offset-X up until an end of the channel occupancy, wherein “Offset” is the offset of the start of the channel occupancy from the subframe n and “X” is a predefined or preconfigured value that is less than or equal to the offset.
8 . The method of claim 1 wherein:
receiving the indication comprises receiving, in a subframe n, a Common Physical Downlink Control Channel, C-PDCCH, that comprises:
the indication, wherein the indication is an indication of an uplink burst duration; and
an indication of an offset of a start of the uplink burst duration from the subframe n; and
restricting the performance of uplink transmissions by the wireless device comprises avoiding uplink transmissions by the wireless device from a subframe n+Offset-X up until an end of the uplink burst duration, wherein “Offset” is the offset of the start of the uplink burst duration from the subframe n and “X” is a predefined or preconfigured value that is less than or equal to the offset.
9 . The method of claim 1 wherein:
restricting the performance of uplink transmissions by the wireless device comprises allowing uplink transmissions by the wireless device in any subframe from a subframe in which the indication was received up until an end of the channel occupancy if the uplink transmission is limited to single subframe transmissions and the uplink transmission leaves a last symbol of the uplink transmission vacated.
10 . The method of claim 1 wherein:
receiving the indication comprises receiving, in a subframe n, a Common Physical Downlink Control Channel, C-PDCCH, that comprises the indication, wherein the indication is an indication of an uplink burst duration; and
restricting the performance of uplink transmissions by the wireless device comprises allowing uplink transmissions by the wireless device in any subframe from the subframe n in which the C-PDCCH was received up until an end of the uplink burst duration if the uplink transmission is limited to single subframe transmissions and the uplink transmission leaves a last symbol of the uplink transmission vacated.
11 . A wireless device for a wireless communication system, comprising:
one or more transceivers; and
circuitry whereby the wireless device is operable to:
receive, from a radio access node via the one or more transceivers, an indication of subframes belonging to a same channel occupancy within a cell that requires Listen-Before-Talk, LBT,
wherein the wireless device is further operable to:
receive, from the radio access node via the one or more transceivers, an indication that the wireless device is allowed to perform uplink transmissions during any of the subframes that belong to the same channel occupancy or during a subset of the subframes that belong to the same channel occupancy; and
restrict performance of uplink transmissions by the wireless device based on the indication of subframes belonging to the same channel occupancy and that the wireless device is allowed to perform uplink transmissions during any of the subframes that belong to the same channel occupancy or during the subset of the subframes that belong to the same channel occupancy.
12 . The wireless device of claim 11 wherein,
receiving the indication comprises being operable to receive a Common Physical Downlink Control Channel, C-PDCCH, that comprises the indication, wherein the indication comprises an indication of a scheduled uplink burst duration;
the wireless device being operable to:
receive, from the radio access node, the indication that the wireless device is allowed to perform uplink transmissions during any subframe or a subset of the subframes from a subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration; and
restricting the performance of uplink transmissions by the wireless device comprises being operable to avoid uplink transmissions by the wireless device in accordance with the indication that the wireless device is allowed to perform uplink transmissions during any subframe or the subset of the subframes from the subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration.
13 . A method of operation of a radio access node in a wireless communication system, comprising:
sending, to a wireless device, an indication of subframes belonging to a same channel occupancy within a cell that requires Listen-Before-Talk, LBT,
wherein the method further comprises:
sending, to the wireless device, an indication that the wireless device is allowed to perform uplink transmissions during any of the subframes that belong to the same channel occupancy or during a subset of the subframes that belong to the same channel occupancy.
14 . The method of claim 13 wherein:
sending the indication comprises sending a Common Physical Downlink Control Channel, C-PDCCH, that comprises the indication, wherein the indication comprises an indication of a scheduled uplink burst duration; and
the indication that the wireless device is allowed to perform uplink transmissions during any of the subframes that belong to the same channel occupancy or during the subset of the subframes that belong to the same channel occupancy is an indication that the wireless device is allowed to perform uplink transmissions during any subframe or a subset of the subframes from a subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration.
15 . The method of claim 14 wherein the indication that the wireless device is allowed to perform uplink transmissions during any subframe or a subset of the subframes from a subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration is comprised in the C-PDCCH.
16 . The method of claim 14 wherein the indication that the wireless device is allowed to perform uplink transmissions during any subframe or the subset of the subframes from a subframe in which the C-PDCCH was received up to and including all subframes until an end of the scheduled uplink burst duration is a 1 bit indication comprised in the C-PDCCH.
17 . A radio access node for a wireless communication system, the radio access node comprising:
one or more processors; and
memory storing instructions executable by the one or more processors whereby the radio access node is operable to:
send, to a wireless device, an indication of subframes belonging to a same channel occupancy within a cell that requires Listen-Before-Talk, LBT,
wherein the memory further stores instructions executable by the one or more processors whereby the radio access node is operable to:
send, to the wireless device, an indication that the wireless device is allowed to perform uplink transmissions during any of the subframes that belong to the same channel occupancy or during a subset of the subframes that belong to the same channel occupancy.