Integrated access and backhaul node resource timing
Methods and apparatus are provided for determining timing of resources in an integrated access and backhaul, IAB, node ( 200 ). In one example, a method ( 1300 ), is performed by an integrated access and backhaul, IAB, node ( 200 ), the method comprising: determining (s 1302 ) one or more timing offset for a time resource, the offset being in relation to a mobile termination, MT, and a distributed unit, DU, resource of the IAB node, and providing (s 1304 ) to a parent IAB node ( 300 ), information related to the one or more timing offset of the IAB node.
1. A method, performed by an integrated access and backhaul (IAB) node, the method comprising:
determining one or more timing offset for a time resource, the offset being in relation to a mobile termination (MT) and a distributed unit (DU) resource of the IAB node,
providing to a parent IAB node, information related to the one or more timing offset of the IAB node, wherein the one or more timing offset have orthogonal frequency-division multiplexing (OFDM) symbol granularity,
wherein the one or more timing offset comprises at least one of the following:
an offset between a DU downlink transmission and an MT downlink reception;
an offset between a DU downlink transmission and an MT uplink transmission;
an offset between a DU uplink reception and an MT downlink reception; and
an offset between a DU uplink reception and an MT uplink transmission.
2. The method of claim 1 , wherein the one or more timing offset is in relation to a frame or slot timing of the MT and DU resources.
3. The method of claim 1 , wherein the information related to the one or more timing offset corresponds to a timing difference between one of the DU resources or one of the MT resources and any one of the other DU or MT resources.
4. The method of claim 1 , further comprising:
obtaining a set of timing quantities which are indicative of one or more timing offset between an MT resource and a DU resource of the IAB node.
5. A method performed by a parent integrated access and backhaul (IAB) node, wherein the parent IAB node is a first IAB node serving a second IAB node, for scheduling downlink and uplink transmissions between the parent IAB node and the second IAB node, the method comprising:
obtaining information related to one or more timing offset between mobile termination (MT) resources and distributed unit (DU) resources of the second IAB node, wherein the one or more timing offset has orthogonal frequency-division multiplexing (OFDM) symbol granularity;
scheduling at least one of uplink transmissions or downlink transmissions at the second IAB node, based on the received information,
wherein the one or more timing offset comprises at least one of the following:
an offset between a DU downlink transmission and an MT downlink reception;
an offset between a DU downlink transmission and an MT uplink transmission;
an offset between a DU uplink reception and an MT downlink reception; and
an offset between a DU uplink reception and an MT uplink transmission.
6. The method of claim 5 , wherein the one or more timing offset is in relation to a frame or slot timing of the MT and DU resources.
7. The method of claim 5 , further comprising the parent IAB node determining one or more timing offset between the MT resource timings and the DU resource timings of the second IAB node based, at least partly, on the obtained information related to the one or more timing offset.
8. The method of claim 5 , wherein the parent IAB node adds one symbol to each determined timing offset.
9. The method of claim 5 , wherein the information is obtained by the parent IAB node via signalling from the second IAB node.
10. An integrated access and backhaul (IAB) node comprising a mobile termination (MT) and a radio interface distributed unit (DU), wherein the MT terminates the radio interface layers of a backhaul interface towards a parent IAB node and the DU interfaces user equipment (UE) and/or MTs of another IAB node, the IAB node comprising:
transceiver circuitry; and
processing circuitry configured to:
determine one or more timing offset for a time resource, the offset being in relation to an MT and a DU resource of the IAB node, and
provide information to the parent IAB node via the transceiver circuitry, the information being related to the one or more timing offset of the IAB node, wherein the one or more timing offset has orthogonal frequency-division multiplexing (OFDM) symbol granularity,
wherein the one or more timing offset comprises at least one of the following:
an offset between a DU downlink transmission and an MT downlink reception;
an offset between a DU downlink transmission and an MT uplink transmission;
an offset between a DU uplink reception and an MT downlink reception; and
an offset between a DU uplink reception and an MT uplink transmission.
11. A parent integrated access and backhaul (IAB) node, wherein a parent IAB node is a first IAB node serving a second IAB node, the parent IAB node comprising:
transceiver circuitry; and
processing circuitry configured to:
obtain information related to one or more timing offset between mobile termination (MT) resources and distributed unit (DU) resources of the second IAB node via the transceiver circuitry, wherein the one or more timing offset has orthogonal frequency-division multiplexing (OFDM) symbol granularity;
schedule uplink or downlink transmissions at the second IAB node based on the one or more timing offset,
wherein the one or more timing offset comprises at least one of the following
an offset between a DU downlink transmission and an MT downlink reception;
an offset between a DU downlink transmission and an MT uplink transmission;
an offset between a DU uplink reception and an MT downlink reception; and
an offset between a DU uplink reception and an MT uplink transmission.