Transport block size determination for repetition
Systems and methods for adapting a timer(s) for a satellite-based radio access network are disclosed. Embodiments of a method performed by a user equipment or a base station and corresponding embodiments of a user equipment or a base station are disclosed. In some embodiments, a method performed by a user equipment or a bases station comprises obtaining an amount of resources elements available and determining a transport block size based on the amount of resources elements available. In some embodiments, repetitions are used. In some embodiments, obtaining the available resource elements amount is based on at least one of: one or more explicit calculations and/or one or more signaled scaling factor(s). In some embodiments, the method further comprises determining (or selecting) a modulation and code rate (MCS) based on the amount of resources elements available.
1. A method performed by a base station device, comprising:
determining an amount of resource elements, REs, available, as N RE , where N RE =S·min (156, N′ RE )·n PRB where n PRB is a total number of allocated physical resource blocks, PRB, for a User Equipment, UE, and S is a scaling factor; and
determining a transport block size, TBS, to be used for a transport block in a transmission to or from a user equipment device, based on the amount of REs available and a number of repetitions of the transport block;
providing, to the user equipment device, information about the number of repetitions of the transport block and the amount of REs available;
transmitting or receiving the transmission based on the determined TBS.
2. The method of claim 1 , wherein determining the amount of REs available is based on: one or more explicit calculations, or one or more signaled scaling factors, or both one or more explicit calculations and one or more signaled scaling factors.
3. The method of claim 1 further comprising selecting a modulation and code rate based on based on the amount of REs available.
4. The method of claim 1 , wherein determining the amount of REs available is based on the number of transmissions scheduled at a same time for the transport block.
5. The method of claim 1 , wherein determining the amount of REs available, N RE , comprises one of:
(a) calculating N RE as N RE =Σ i=1 N t N RE,i where N RE,i is an approximation of a total number of REs available for transmission i of the number of transmissions of the transport block, and N t is the total number of transmissions scheduled at a same time for the transport block;
(b) calculating N RE after adding together the number of REs available for data and used for demodulation reference signals, DMRS, in all of the transmissions of the transport block.
6. The method of claim 1 , wherein determining the TBS based on the amount of REs available and a number of repetitions of the transport block is based on an intermediate number of information bits, N info , which is a function of at least N RE , a target code rate (R), and a modulation order Q m .
7. The method of claim 6 , wherein N info is further based on a scaling factor.
8. A user equipment comprising: processing circuitry configured to:
determine an amount of resource elements, REs, available, as N RE , where N RE =S·min (156, N′ RE )·n PRB where n PRB is a total number of allocated physical resource blocks, PRB, for the user equipment and S is a scaling factor; and
determine a transport block size, TBS, to be used for a transport block in a transmission to or from a base station device, based on the amount of REs available and a number of repetitions of the transport block;
receive, from the base station device, information about the number of repetitions of the transport block and the amount of REs available;
receive the transmission based on the determined TBS.
9. The user equipment of claim 8 , wherein the determining the amount of resource elements is based on the number of transmissions scheduled at the same time for the transport block.
10. The user equipment of claim 8 , wherein the amount of REs available, N RE , is obtained by:
(a) calculating N RE =Σ i=1 N t N RE,i where N RE,i is an approximation of a total number of REs available for transmission i of the number of transmissions of the transport block, and N t is the total number of transmissions scheduled at a same time for the transport block;
(b) calculating N RE after adding together the number REs available for data and used for demodulation reference signals, DMRS, in all of the transmissions of the transport block.
11. The user equipment of claim 8 , wherein determining the TBS based on the amount of REs available and a number of repetitions of the transport block is based on an intermediate number of information bits, N info , which is a function of at least N RE , a target code rate, R, and a modulation order Q m .
12. The user equipment of claim 11 , wherein N info is further based on a scaling factor.
13. A base station comprising: processing circuitry configured to:
determine an amount of resource elements, REs, available, as N RE , where N RE =S·min (156, N′ RE )·n PRB where n PRB is a total number of allocated physical resource blocks, PRB, for a User Equipment, UE, and S is a scaling factor; and
determine a transport block size, TBS, to be used for a transport block in a transmission to or from a user equipment, based on the amount of REs available and a number of repetitions of the transport block;
provide, to the user equipment, information about the number of repetitions of the transport block and the amount of REs available;
transmit the transmission based on the determined TBS.
14. The base station of claim 13 , wherein the amount of REs available, N RE , is determined based on the number of transmissions scheduled at the same time for the transport block.
15. The base station of claim 13 , wherein the amount of REs available, N RE , is obtained by:
(a) calculating N RE as N RE =Σ i=1 N t N RE,i where N RE,i is an approximation of a total number of REs available for transmission i of the number of transmissions of the transport block, and N t is the total number of transmissions scheduled at a same time for the transport block;
(b) calculating N RE after adding together the number of REs available for data and used for demodulation reference signals, DMRS, in all of the transmissions of the transport block.
16. The base station of claim 13 , wherein the determining the TBS based on the amount of REs available and a number of repetitions of the transport block is based on an intermediate number of information bits, N info , which is a function of at least N RE , a target code rate, R, and a modulation order Q m .
17. The base station of claim 16 , wherein N info is further based on a scaling factor.