Adjusting retransmission timing for a configured grant
Apparatuses, methods, and systems are disclosed for adjusting retransmission timing for a configured grant. One apparatus includes a processor that determines an offset value for a retransmission timer associated with a configured grant for communications between the UE and a mobile wireless communication network. The processor starts the retransmission timer adjusted by the offset value in response to transmission of data corresponding to a transport block (“TB”) on a hybrid automatic repeat request (“HARQ”) process. The processor detects expiration of the retransmission timer associated with the configured grant. In response to detecting expiration of the retransmission timer, the processor determines a transmission resource from a plurality of configured transmission resources for retransmitting a TB.
1 . A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the memory and configured to cause the UE to:
determine an offset value for a retransmission timer associated with a configured grant, the offset value comprising a value that is randomly generated within an interval that has an upper bound defined as a function of at least one of a quality of service (“QoS”) requirement and a number of retransmissions of a transport block (“TB”);
adjust the retransmission timer based at least in part on the offset value;
start the adjusted retransmission timer in response to a transmission of a TB of a hybrid automatic repeat request (“HARQ”) process;
detect an expiration of the adjusted retransmission timer; and
in response to the expiration of the adjusted retransmission timer, determine a resource associated with the configured grant for retransmitting the TB.
2 . The UE of claim 1 , wherein the offset value is associated with retransmission of the TB, determining the resource associated with the configured grant for retransmitting the TB, or a combination thereof.
3 . The UE of claim 1 , wherein the offset value comprises a randomly-generated value.
4 . The UE of claim 3 , wherein the at least one processor is configured to cause the UE to obtain the random value as a uniform distribution from a second interval with configurable lower and upper bounds.
5 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to reset a retransmission counter used to determine the upper bound in response to retransmission of the TB being scheduled by a dynamic grant.
6 . The UE of claim 1 , wherein the offset value is:
exponentially increased for each retransmission attempt;
randomized for each retransmission attempt in response to not receiving a request for a retransmission; or
a combination thereof.
7 . The UE of claim 1 , wherein the adjusted retransmission timer is started in response to expiration of an initial retransmission timer such that retransmission of the TB occurs in response to expiration of the initial retransmission timer and the adjusted retransmission timer.
8 . The UE of claim 1 , wherein, in response to the offset value being a negative value, the at least one processor is configured to cause the UE to reset the adjusted retransmission timer to its initial value.
9 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to, in response to a configured grant resource occurring within a time slot while the adjusted retransmission timer is not expired, skip the configured grant resource so that retransmission of the TB on the configured grant resource does not occur.
10 . The UE of claim 9 , wherein the at least one processor is configured to cause the UE to transmit different data associated with a different HARQ process on the skipped configured grant resource.
11 . The UE of claim 1 , wherein the offset value is zero in response to a periodicity of the configured grant satisfying a predetermined threshold.
12 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to identify additional configured grant resources that can be used for retransmission of the TB and retransmit the TB on the identified additional configured grant resources in response to a priority of the TB satisfying a predetermined priority.
13 . A method performed by a user equipment (UE), comprising:
determining an offset value for a retransmission timer associated with a configured grant, the offset value comprising a value that is randomly generated within an interval that has an upper bound defined as a function of at least one of a quality of service (“QoS”) requirement and a number of retransmissions of a transport block (“TB”);
adjusting the retransmission timer based at least in part on the offset value;
starting the adjusted retransmission timer in response to a transmission of a TB of a hybrid automatic repeat request (“HARQ”) process;
detecting an expiration of the adjusted retransmission timer; and
in response to the expiration of the adjusted retransmission timer, determining a resource associated with the configured grant for retransmitting the TB.
14 . The method of claim 13 , wherein the offset value is associated with retransmission of the TB, determining a transmission resource for retransmitting the TB, or a combination thereof.
15 . The method of claim 13 , wherein the offset value comprises a randomly-generated value.
16 . The method of claim 15 , further comprising obtaining the random value as a uniform distribution from a second interval with configurable lower and upper bounds.
17 . The method of claim 13 , further comprising resetting a retransmission counter used to determine the upper bound in response to retransmission of the TB being scheduled by a dynamic grant.
18 . The method of claim 13 , wherein the offset value is:
exponentially increased for each retransmission attempt;
randomized for each retransmission attempt in response to not receiving a request for a retransmission; or
a combination thereof.
19 . A network equipment, comprising:
at least one memory; and
at least one processor coupled with the memory and configured to cause the network equipment to:
determine an offset value for a retransmission timer associated with a configured grant, the offset value comprising a value that is randomly generated within an interval that has an upper bound defined as a function of at least one of a quality of service (“QoS”) requirement and a number of retransmissions of a transport block (“TB”); and
transmit the offset value to a user equipment (“UE”) for adjusting the retransmission timer for retransmissions of TBs.
20 . A method performed by a network equipment, comprising:
determining an offset value for a retransmission timer associated with a configured grant, the offset value comprising a value that is randomly generated within an interval that has an upper bound defined as a function of at least one of a quality of service (“QoS”) requirement and a number of retransmissions of a transport block (“TB”); and
transmitting the offset value to a user equipment (“UE”) for adjusting the retransmission timer for retransmissions of TBs.