Reconfiguring resources for transmission
Apparatus and method in a communication system for reconfiguring resources for transmission are disclosed. More than one sidelink transmissions are transmitted to a second apparatus. It is determined that reception status feedbacks are not received regarding a given number of sidelink transmissions. Transmission resource used for sidelink transmission is reconfigured based on the determination.
1. A first apparatus in a communication system, comprising:
at least one processor; and
at least one memory including computer program code, the at least one memory and computer program code being configured, with the processor, to cause the first apparatus to:
transmit more than one sidelink transmission to a second apparatus;
determine that reception status feedbacks are not received regarding a given number of sidelink transmissions;
determine a ratio of survival time to resource reservation interval; and
reconfigure transmission resource used for sidelink transmission based on the determination by reconfiguring the used resource for transmission if the ratio is larger than the given number of consecutive sidelink transmissions by a given margin.
2. The first apparatus of claim 1 , the at least one memory and the computer program code configured to, with the at least one processor, cause the first apparatus further to:
determine, based on a quality of transmission received from the second apparatus, that missing acknowledgements are not due to channel quality between the first apparatus and the second apparatus; and
take determination into account in the reconfiguration of transmission resource.
3. The first apparatus of claim 1 , the at least one memory and the computer program code configured to, with the at least one processor, cause the first apparatus further to:
perform reconfiguration based on survival time and Resource Reservation Interval defined for the system or service.
4. The first apparatus of claim 1 , wherein the given number of sidelink transmissions is a system-configured parameter.
5. The first apparatus of claim 1 , the at least one memory and the computer program code configured to, with the at least one processor, cause the first apparatus further to:
compare an ID of the first apparatus with an ID of the second apparatus, whose feedbacks regarding the given number of consecutive sidelink transmissions are determined as not received; and
reconfigure transmission resource if the ID of the first apparatus is smaller than the ID of the second apparatus.
6. The first apparatus of claim 1 , the at least one memory and the computer program code configured to, with the at least one processor, cause the first apparatus further to:
determine a given number of consecutive sidelink transmissions θ RC as
θ
R
C
=
max
(
2
,
floor
(
γ
*
survival
time
RRI
)
)
,
where γ is a system-configured parameter and RRI a resource reservation interval.
7. The first apparatus of claim 1 , the at least one memory and the computer program code configured to, with the at least one processor, cause the first apparatus further to:
determine ratio of survival time to resource reservation interval; and
perform reconfiguration of transmission resource by reconfiguring the used resource and configuring a set of new resources for transmission and transmit using the resources, if the ratio is closer to the given number of consecutive sidelink transmissions than a given margin.
8. The first apparatus of claim 1 , wherein the reconfigured transmission resources may include different time-domain resources comparing to the determined resources where feedbacks are not received regarding a given number of sidelink transmissions.
9. A method in a first apparatus in a communication system, said method comprising the steps of:
transmitting more than one sidelink transmission to a second apparatus;
determining that reception status feedbacks are not received regarding a given number of sidelink transmissions;
determining ratio of survival time to resource reservation interval; and
reconfiguring transmission resource used for sidelink transmission based on the determination by reconfiguring the used resource for transmission if the ratio is larger than the given number of consecutive sidelink transmissions by a given margin.
10. The method of claim 9 , further comprising
determining, based on a quality of transmission received from the second apparatus, that missing acknowledgements are not due to channel quality between the first apparatus and second apparatus and taking determination into account in the reconfiguration of transmission resource.
11. The method of claim 9 , further comprising
performing reconfiguration based on survival time and Resource Reservation Interval defined for the system or service.
12. The method of claim 9 , further comprising:
comparing an ID of the first apparatus with an ID of the second apparatus, whose feedbacks regarding the given number of consecutive sidelink transmissions are determined as not received; and
reconfiguring transmission resource if the ID of the first apparatus is smaller than the ID of the second apparatus.
13. The method of claim 9 , further comprising:
determining a given number of consecutive sidelink transmissions θ RC as
θ
R
C
=
max
(
2
,
floor
(
γ
*
survival
time
RRI
)
)
,
where γ is a system-configured parameter and RRI a resource reservation interval.
14. The method of claim 9 , further comprising:
determining a ratio of survival time to resource reservation interval; and
performing reconfiguration of transmission resource by reconfiguring the used resource and configuring a set of new resources for transmission and transmit using the resources, if the ratio is closer to the given number of consecutive sidelink transmissions than a given margin.
15. The method of claim 9 , wherein the reconfigured transmission resources may include different time-domain resources comparing to the determined resources where feedbacks are not received regarding a given number of sidelink transmissions.
16. A non-transitory computer-readable medium, said non-transitory computer-readable medium storing instructions which, when executed on a first apparatus, cause the first apparatus to at least perform:
transmitting more than one sidelink transmission to a second apparatus;
determining that reception status feedbacks are not received regarding a given number of sidelink transmissions;
determining ratio of survival time to resource reservation interval; and
reconfiguring transmission resource used for sidelink transmission based on the determination by reconfiguring the used resource for transmission if the ratio is larger than the given number of consecutive sidelink transmissions by a given margin.
17. The non-transitory computer-readable medium of claim 16 , the medium storing instructions which cause the first apparatus further to perform:
determining, based on a quality of transmission received from the second apparatus, that missing acknowledgements are not due to channel quality between the first apparatus and the second apparatus; and
taking the determination into account in the reconfiguration of transmission resource.
18. The non-transitory computer-readable medium of claim 16 , the medium storing instructions which cause the first apparatus further to perform:
comparing an ID of the first apparatus with an ID of the second apparatus, whose feedbacks regarding the given number of consecutive sidelink transmissions are determined as not received; and
reconfiguring the transmission resource if the ID of the first apparatus is smaller than the ID of the second apparatus.