TRANSPORT BLOCK SIZE DETERMINATION

• US 20160112898A1
• Filed: 10/19/2015
• Published: 04/21/2016
• Est. Priority Date: 10/20/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: CHEN, Wanshi, XU, Hao, GAAL, Peter
• Granted Patent: US 10,575,205 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 28/0215 based on user or device properties, e.g. MTC-capable devices services for machine-to-machine communication [M2M] or machine type communication [MTC] H04W4/70; wireless resource selection or allocation plan definition based on terminal or device properties H04W72/51
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

Aspects of the present disclosure provide techniques that may be applied in systems comprising machine type communication (MTC) user equipments (UEs). An exemplary method performed by a base station comprises using a first transport block size (TBS) table to communicate with a first type of user equipment (UE), using a second TBS table to communicate with a second type of UE, wherein the first type of UE supports a reduced peak data rate relative to the second type of UE, signaling information to the first type of UE for use in determining a TBS from the first TBS table, and communicating with the first type of UE, with one or more transmissions having a payload with a number of bits determined based on a TBS value from the first TBS table selected based, at least in part, on the signaled information.

Claims

1. A method for wireless communications by a base station (BS), comprising:

using at least a first transport block size (TBS) table to communicate with a first type of user equipment (UE);

using a second TBS table to communicate with a second type of UE, wherein the first type of UE supports a reduced peak data rate relative to the second type of UE;

signaling information to the first type of UE for use in determining a TBS from the first TBS table; and

communicating with the first type of UE with one or more transmissions having a payload with a number of bits determined based on a TBS value from the first TBS table selected based, at least in part, on the signaled information.

2. The method of claim 1, wherein the first TBS table and second TBS table are each a subset of a larger TBS table.

3. The method of claim 1, wherein the information signaled to the first type of UE comprises an explicit index to the first TBS table.

4. The method of claim 3, wherein:

the explicit index is based on a mapping into the first TBS table; and

different mappings are used for different operating modes of the first type of UE.

5. The method of claim 4, wherein the different operating modes of the first type of UE comprise receiving downlink transmissions and receiving uplink transmissions.

6. The method of claim 4, wherein the different operating modes of the first type of UE comprise receiving unicast transmissions and receiving broadcast transmissions.

7. The method of claim 1, wherein the TBS value from the first TBS table is selected, at least in part, based on a transmission time interval (TTI) bundling size indicating a number of subframes over which a payload is transmitted.

8. The method of claim 1, wherein the first TBS table shares a common set of entries with the second TBS table.

9. The method of claim 1, wherein the first TBS table has a limited number of entries relative to the second TBS table.

10. The method of claim 9, wherein an index to the first TBS table requires at least one less bit than an index into the second TBS table.

11. The method of claim 1, wherein a maximum TBS of the first table is less than a maximum TBS of the second table.

12. The method of claim 1, wherein values in the first TBS table do not monotonically increase across all entries.

13. The method of claim 1, wherein the first TBS table is used to determine TBS values for at least one of:

both downlink and uplink transmissions;

both unicast and broadcast transmissions;

or

Multimedia Broadcast Multicast Service (MBMS) transmissions.

14. A method for wireless communications by a user equipment (UE), comprising:

using a first transport block size (TBS) table to communicate with a base station (BS), wherein the first TBS table has a reduced maximum TBS value relative to a second TBS table used by the BS to communicate with a second type of UE and wherein the first type of UE supports a reduced peak data rate relative to the second type of UE;

receiving information from the BS for use in determining a TBS from the second TBS table; and

communicating with the BS with one or more transmissions having a payload with a number of bits determined based on a TBS value from the first TBS table selected based, at least in part, on information signaled from the BS.

15. The method of claim 14, wherein the first TBS table and second TBS table are each a subset of a larger TBS table.

16. The method of claim 14, wherein the information signaled from the BS comprises an explicit index to the first TBS table.

17. The method of claim 16, wherein:

the explicit index is based on a mapping into the first TBS table; and

different mappings are used for different operating modes of the UE.

18. The method of claim 17, wherein the different operating modes of the UE comprise receiving downlink transmissions and receiving uplink transmissions.

19. The method of claim 17, wherein the different operating modes of the UE comprise receiving unicast transmissions and receiving broadcast transmissions.

20. The method of claim 14, wherein the TBS value from the first TBS table is selected, at least in part, based on a transmission time interval (TTI) bundling size indicating a number of subframes over which a payload is transmitted.

21. The method of claim 14, wherein the first TBS table shares a common set of entries with the second TBS table.

22. The method of claim 14, wherein the first TBS table has a limited number of entries relative to the second TBS table.

23. The method of claim 22, wherein an index to the first TBS table requires at least one less bit than an index into the second TBS table.

24. The method of claim 14, wherein a maximum TBS of the first table is less than a maximum TBS of the second table.

25. The method of claim 14, wherein values in the first TBS table do not monotonically increase across all entries.

26. The method of claim 14, wherein the first TBS table is used to determine TBS values for at least one of:

both downlink and uplink transmissions;

both unicast and broadcast transmissions;

or

Multimedia Broadcast Multicast Service (MBMS) transmissions.

27. An apparatus for wireless communications by a base station (BS), comprising:

at least one processor configured to use a first transport block size (TBS) table to communicate with a first type of user equipment (UE), use a second TBS table to communicate with a second type of UE, wherein the first type of UE supports a reduced peak data rate relative to the second type of UE, signal information to the first type of UE for use in determining a TBS from the first TBS table, and communicate with the first type of UE with one or more transmissions having a payload with a number of bits determined based on a TBS value from the first TBS table selected based, at least in part, on the signaled information; and

a memory coupled with the at least one processor.

28. An apparatus for wireless communications by a user equipment (UE), comprising:

at least one processor configured to use a first transport block size (TBS) table to communicate with a base station (BS), wherein the first TBS table has a reduced maximum TBS value relative to a second TBS table used by the BS to communicate with a second type of UE and wherein the first type of UE supports a reduced peak data rate relative to the second type of UE, receive information from the BS for use in determining a TBS from the second TBS table, and communicate with the BS with one or more transmissions having a payload with a number of bits determined based on a TBS value from the first TBS table selected based, at least in part, on information signaled from the BS; and

a memory coupled with the at least one processor.