Multiple TBS for Msg3 in data transmission during random access
A base station ( 110 ) enables a wireless device ( 120 ) (e.g., user equipment) to transmit user data on an uplink ( 130 ) during random access. The base station ( 110 ) transmits a resource grant indicating a plurality of options from which the wireless device ( 120 ) is permitted to select for use in transmitting the user data on the uplink ( 130 ) during random access. Each respective option comprises a transport block size; and a number of resource units and/or physical resource blocks. The wireless device ( 120 ) receives the resource grant, and transmits the user data on the uplink ( 130 ) during random access to the base station ( 110 ) according to at least one of the options.
1. A method performed by a wireless device for transmitting user data on an uplink during random access, the method comprising:
receiving a resource grant indicating a plurality of options for the transmitting of the user data on the uplink during random access, each respective option comprising a transport block size (TBS) and a number of repetitions, wherein:
one of the TBSs is a maximum permitted TBS and the other TBSs are derived from the maximum permitted TBS using a predefined set of smaller TBS values; and
the number of repetitions of each option is determined as a function of the maximum permitted TBS and a maximum number of repetitions supported in a cell served by a base station; and
transmitting the user data on the uplink during random access to the base station according to at least one of the options.
2. The method of claim 1 , further comprising receiving a time offset index indicating an amount of time between transmission start times respectively corresponding to the options.
3. The method of claim 1 , further comprising receiving a frequency offset index indicating an amount of frequency between transmission frequencies respectively corresponding to the options.
4. The method of claim 1 , further comprising using a predefined formula to calculate a first option of the plurality of options from a second option of the plurality of options.
5. The method of claim 1 , wherein the plurality of options are a subset of a plurality of predefined options for the transmitting of the user data on the uplink during random access, and the method further comprises receiving an indication of how many options are in the subset via cell-specific signalling or via non-cell specific System Information broadcast.
6. The method of claim 1 , wherein the maximum permitted TBS is one of a plurality of maximum permitted TBSs, each of which corresponds to a respective coverage enhancement level.
7. The method of claim 1 , wherein each respective option further comprises a number of resource units and/or physical resource blocks corresponding to the TBS of the option.
8. A method performed by a base station for enabling a user equipment to transmit user data on an uplink during random access, the method comprising:
transmitting a resource grant indicating a plurality of options from which the user equipment is permitted to select for use in transmitting the user data on the uplink during random access, each respective option comprising a transport block size (TBS) and a number of repetitions, wherein:
one of the TBSs is a maximum permitted TBS and the other TBSs are derived from the maximum permitted TBS using a predefined set of smaller TBS values; and
the number of repetitions of each option is determined as a function of the maximum permitted TBS and a maximum number of repetitions supported in a cell served by the base station;
receiving the user data on the uplink during the random access according to at least one of the options.
9. The method of claim 8 , further comprising determining a modulation and coding index for the resource grant based on channel conditions, a number of Msg3 grants supported by the base station, and/or a size predefined for transmitting during random access.
10. The method of claim 8 , further comprising transmitting a time offset index indicating an amount of time between transmission start times respectively corresponding to the options.
11. The method of claim 8 , further comprising transmitting a frequency offset index indicating an amount of frequency between transmission frequencies respectively corresponding to the options.
12. The method of claim 8 , wherein the plurality of options are a subset of a plurality of predefined options for the transmitting of the user data on the uplink during random access, and the method further comprises transmitting an indication of how many options are in the subset via cell-specific signalling or via non-cell specific System Information broadcast.
13. The method of claim 8 , wherein the maximum permitted TBS is one of a plurality of maximum permitted TBSs, each of which corresponds to a respective coverage enhancement level.
14. The method of claim 8 , wherein each respective option further comprises a number of resource units and/or physical resource blocks corresponding to the TBS of the option.
15. A wireless device for transmitting user data on an uplink, the wireless device comprising:
communication circuitry configured to exchange information with a base station;
processing circuitry communicatively connected to the communication circuitry and configured to:
receive, via the communication circuitry, a resource grant indicating a plurality of options for the transmitting of the user data on the uplink during random access, each respective option comprising a transport block size (TBS) and a number of repetitions, wherein:
one of the TBSs is a maximum permitted TBS and the other TBSs are derived from the maximum permitted TBS using a predefined set of smaller TBS values; and
the number of repetitions of each option is determined as a function of the maximum permitted TBS and a maximum number of repetitions supported in a cell served by the base station; and
transmit, via the communication circuitry, the user data on the uplink during random access to the base station according to at least one of the options.
16. The wireless device of claim 15 , wherein the processing circuitry is further configured to receive, via the communication circuitry, a time offset index indicating an amount of time between transmission start times respectively corresponding to the options.
17. The wireless device of claim 15 , wherein the processing circuitry is further configured to receive, via the communication circuitry, a frequency offset index indicating an amount of frequency between transmission frequencies respectively corresponding to the options.
18. The wireless device of claim 15 , wherein the processing circuitry is further configured to use a predefined formula to calculate a first option of the plurality of options from a second option of the plurality of options.
19. The wireless device of claim 15 , wherein the plurality of options are a subset of a plurality of predefined options for the transmitting of the user data on the uplink during random access, and the processing circuitry is further configured to receive, via the communication circuitry, an indication of how many options are in the subset via cell-specific signalling or via non-cell specific System Information broadcast.
20. The wireless device of claim 15 , wherein each respective option further comprises a number of resource units and/or physical resource blocks corresponding to the TBS of the option.
21. A base station for enabling a user equipment to transmit user data on an uplink during random access, the base station comprising:
communication circuitry configured to exchange information with the user equipment;
processing circuitry communicatively connected to the communication circuitry and configured to:
transmit, via the communication circuitry, a resource grant indicating a plurality of options from which the user equipment is permitted to select for use in transmitting the user data on the uplink during random access, each respective option comprising a transport block size (TBS) and a number of repetitions, wherein:
one of the TBSs is a maximum permitted TBS and the other TBSs are derived from the maximum permitted TBS using a predefined set of smaller TBS values; and
the number of repetitions of each option is determined as a function of the maximum permitted TBS and a maximum number of repetitions supported in a cell served by the base station; and
receive, via the communication circuitry, the user data on the uplink during the random access according to at least one of the options.
22. The base station of claim 21 , wherein the processing circuitry is further configured to determine a modulation and coding index for the resource grant based on channel conditions, a number of Msg3 grants supported by the base station, and/or a size predefined for transmitting during random access.
23. The base station of claim 21 , wherein the processing circuitry is further configured to transmit, via the communication circuitry, a time offset index indicating an amount of time between transmission start times respectively corresponding to the options.
24. The base station of claim 21 , wherein the processing circuitry is further configured to transmit, via the communication circuitry, a frequency offset index indicating an amount of frequency between transmission frequencies respectively corresponding to the options.
25. The base station of claim 21 , wherein the plurality of options are a subset of a plurality of predefined options for the transmitting of the user data on the uplink during random access, and the processing circuitry is further configured to transmit an indication of how many options are in the subset via cell-specific signalling or via non-cell specific System Information broadcast.
26. The base station of claim 21 , wherein each respective option further comprises a number of resource units and/or physical resource blocks corresponding to the TBS of the option.