Collision handling of configured grant based autonomous uplink transmissions
Embodiments include methods, performed by a user equipment (UE), for uplink (UL) transmission on a shared channel in a cell of a radio access network (RAN). Such methods include determining that the shared channel is unavailable for UL transmission of pending data during a first transmission opportunity. This determination can be based on performing a listen-before-talk (LBT) procedure on the shared channel. Such methods include determining that further data for UL transmission is available before a second transmission opportunity that is after the first transmission opportunity, and determining whether the pending data or the further data should be prioritized for UL transmission during the second transmission opportunity. This prioritization determination can be based on various factors. Such methods can also include transmitting the pending data or the further data, during the second transmission opportunity, based on the prioritization determination. Other embodiments include UEs configured to perform such methods.
1 . A method, performed by a user equipment, UE, for uplink, UL, transmission on a shared channel in a cell of a radio access network, RAN, the method comprising:
receiving, by the UE from a serving network node in the RAN, at least one rule via at least one downlink transmission message, wherein the at least one rule is configured on the UE by the serving network node as a configured rule;
determining that the shared channel is unavailable for UL transmission of pending data during a first transmission opportunity;
determining that further data for UL transmission is available before a second transmission opportunity that is after the first transmission opportunity; and
determining based on the configured rule whether the pending data or the further data should be prioritized for UL transmission during the second transmission opportunity.
2 . The method of claim 1 , wherein the determining that the further data is available before the second transmission opportunity comprises determining that the further data is available after the first transmission opportunity.
3 . The method of claim 1 , wherein:
the method further comprising receiving, from a network node serving the cell, a configured UL grant of resources associated with the shared channel;
the configured UL grant is applicable for a plurality of transmission opportunities during which UL transmission by the UE is permitted on the shared channel; and
the plurality of transmission opportunities includes the first and second transmission opportunities.
4 . The method of claim 1 , wherein the determining whether the pending data or the further data should be prioritized is based on one or more of the following:
logical channel priorities associated with the pending data and with the further data;
service types associated with the pending data and with the further data;
quality of service, QOS, requirements associated with the pending data and with the further data;
an amount of time that the pending data has been queued by the UE;
a predetermined rule prioritizing data pending before a listen-before-talk, LBT, determination that the shared channel is unavailable; and
a predetermined rule prioritizing data received after an LBT determination that the shared channel is unavailable.
5 . The method of claim 1 , wherein the determining whether the pending data or the further data should be prioritized comprises determining that the further data should be prioritized based on an amount of time that the pending data has been queued by the UE being one or more of the following:
less than or equal to a first threshold, such that the pending data will meet its associated QOS requirements in the event the further data is prioritized; and
greater than a second threshold, such that the pending data will not meet its associated QoS requirements in the event the pending data is prioritized.
6 . The method of claim 1 , wherein the determining whether the pending data or the further data should be prioritized comprises determining that the pending data should be prioritized based on an amount of time that the pending data has been queued by the UE being greater than a third threshold, such that the pending data must be prioritized to meet its associated QoS requirements.
7 . The method of claim 1 , wherein:
the determining whether the pending data or the further data should be prioritized comprises determining whether the further data is received less than a predetermined duration before the second transmission opportunity; and
the predetermined duration is associated with an amount of time needed by the UE to prepare a transport block containing the further data.
8 . The method of claim 7 , wherein when the further data is received less than the predetermined duration before the second transmission opportunity, the pending data is prioritized regardless of other reasons for prioritizing the further data.
9 . The method of claim 1 , wherein the determining whether the pending data or the further data should be prioritized comprises determining availability of any hybrid ARQ, HARQ, buffer that does not contain data awaiting retransmission, for storing the further data for UL transmission.
10 . The method of claim 9 , wherein when no HARQ buffers that do not contain data awaiting retransmission are determined to be available, the pending data is prioritized regardless of other reasons for prioritizing the further data.
11 . The method of claim 1 , further comprising:
storing the pending data as a first transport block, TB, in a first hybrid ARQ, HARQ, buffer; and
storing the further data as a second TB in a second HARQ buffer.
12 . The method of claim 11 , wherein the second HARQ buffer is associated with a different HARQ process than the first HARQ buffer.
13 . The method of claim 11 , wherein:
the second HARQ buffer is the first HARQ buffer; and
the method further comprises, based on the determination of prioritization, selectively reordering the first TB and the second TB in the first HARQ buffer.
14 . The method of claim 1 , wherein:
the determining that the shared channel is unavailable comprises performing a listen-before-talk, LBT, procedure on the shared channel; and
the pending data is pending due a previous determination, by a previous LBT procedure, that the shared channel was unavailable for UL transmission during a previous transmission opportunity before the first transmission opportunity.
15 . The method of claim 1 , further comprising, based on the determination of prioritization, transmitting the pending data or the further data during the second transmission opportunity.
16 . The method of claim 15 , wherein the transmitting the pending data or the further data is further based on determining that the shared channel is available for UL transmission during the second transmission opportunity.
17 . A user equipment, UE configured for uplink, UL, transmission on a shared channel in a cell of a radio access network, RAN, the UE comprising:
radio transceiver circuitry configured to communicate with the RAN via the cell; and
processing circuitry operably coupled to the radio transceiver circuitry, whereby the processing circuitry and the radio interface circuitry are configured to:
receive, from a serving network node in the RAN, at least one rule via at least one downlink transmission message, wherein the at least one rule is configured on the UE by the serving network node as a configured rule;
determine that the shared channel is unavailable for UL transmission of pending data during a first transmission opportunity;
determine that further data for UL transmission is available before a second transmission opportunity that is after the first transmission opportunity; and
determine based on the configured rule whether the pending data or the further data should be prioritized for UL transmission during the second transmission opportunity.
18 . The UE of claim 17 , wherein the processing circuitry and the radio interface circuitry are further configured to perform operations wherein the determine that the further data is available before the second transmission opportunity comprises determine that the further data is available after the first transmission opportunity.
19 . A non-transitory, computer-readable medium storing program instructions that, when executed by processing circuitry of a user equipment, UE configured for uplink, UL, transmission on a shared channel in a cell of a radio access network, RAN, configure the UE to:
receive, from a serving network node in the RAN, at least one rule via at least one downlink transmission message, wherein the at least one rule is configured on the UE by the serving network node as a configured rule;
determine that the shared channel is unavailable for UL transmission of pending data during a first transmission opportunity;
determine that further data for UL transmission is available before a second transmission opportunity that is after the first transmission opportunity; and
determine based on the configured rule whether the pending data or the further data should be prioritized for UL transmission during the second transmission opportunity.
20 . The non-transitory, computer-readable medium of claim 19 , further storing program instructions that, when executed by the processing circuitry, configure the UE to perform operations wherein the determine that the further data is available before the second transmission opportunity comprises determine that the further data is available after the first transmission opportunity.