Method and apparatus for wireless communication

1. A method at a terminal device for wireless communication, comprising:

generating a buffer size (BS) table for at least one logical channel group (LCG) based on at least one reference BS table and a scaling factor, wherein BS values in the at least one reference BS table are multiplied by the scaling factor to generate the BS table, wherein the at least one LCG is configured by a network device for the terminal device;

generating a buffer status report (BSR) based on the BS table for the at least one LCG; and

transmitting the BSR to the network device, wherein the BSR comprising a LCG identity (ID) field and a BS field for corresponding LCG,

wherein a size of the LCG ID field is configured based on a number of LCGs used by the terminal device.

2. The method according to claim 1 , wherein the BS field occupies 5 bits, and the LCG ID field occupies 3 bits.

3. The method according to claim 1 , wherein the at least one reference BS table is generated based on at least one of:

a maximum uplink transport block size, a maximum number of layers, a maximum number of component carriers (CCs), a maximum carrier bandwidth of each CC supported by the terminal device, a longest round trip time (RTT) length of a hybrid automatic repeat request (HARQ), a fraction of uplink slots in case of time division duplex, BSR report interval, and a number of bits occupied by the BS field in the BSR.

4. The method according to claim 1 , wherein the at least one reference BS table is associated with respective reference numerologies/transmission time-interval (TTI) lengths, BSR report interval, or HARQ RTTs, and wherein respective scaling factors are determined based on one of the respective reference numerologies/TTI lengths, BSR report interval, or HARQ RTTs and one of respective numerologies/TTI lengths, BSR report interval, or HARQ RTTs, that is associated with the at least one LCG.

5. The method according to claim 1 , wherein selected LCGs are able to use a first format, and a selection of a subset of LCGs is based on at least one of a LCG/logical channel (LCH) priorities, a volume of available data for the LCG and service type of the LCG.

6. A method at a network device for wireless communication, comprising:

configuring a terminal device with at least one logical channel group (LCG);

configuring a buffer status report (BSR) format for the terminal device,

receiving a BSR of the at least one LCG from the terminal device;

determining a buffer size (BS) table based on at least one reference BS table and a scaling factor, wherein BS values in the at least one reference BS table are multiplied by the scaling factor to generate the BS table for the at least one LCG; and

obtaining respective BS values for the at least one LCG based on the BS table,

wherein the BSR format comprising a LCG identity (ID) field and a BS field for corresponding LCG, and wherein a size of the LCG ID field is configured based on a number of LCGs used by the terminal device.

7. The method according to claim 6 , wherein the BS field occupies 5 bits, and the LCG ID field occupies 3 bits.

8. The method according to claim 6 , wherein the at least one refernce BS table is generated based on at least one of:

a maximum uplink transport block size, a maximum number of layers, a maximum number of component carriers (CCs), a maximum carrier bandwidth of each CC supported by the terminal device, a longest round trip time (RTT) length of a hybrid automatic repeat request (HARQ), a fraction of uplink slots in case of time division duplex, BSR report interval, and a number of bits occupied by the BS field in the BSR.

9. An apparatus at a terminal device for wireless communication, comprising:

a processor; and

a memory containing instructions which, when executed by the processor, cause the apparatus to perform operations to:

generate a buffer size (BS) table for at least one logical channel group (LCG) based on at least one reference BS table and a scaling factor, wherein BS values in the at least one reference BS table are multiplied by the scaling factor to generate the BS table, wherein the at least one LCG is configured by a network device for the terminal device;

generate a buffer status report (BSR) based on the BS table for the at least one LCG; and

transmit the BSR to the network device, wherein the BSR comprising a LCG identity (ID) field and a BS field for corresponding LCG,

wherein a size of the LCG ID field is configured based on a number of LCGs used by the terminal device.

10. The apparatus according to claim 9 , wherein the BS field occupies 5 bits, and the LCG ID field occupies 3 bits.

11. The apparatus according to claim 9 , wherein the at least one reference BS table is generated based on at least one of:

a maximum uplink transport block size, a maximum number of layers, a maximum number of component carriers (CCs), a maximum carrier bandwidth of each CC supported by the terminal device, a longest round trip time (RTT) length of a hybrid automatic repeat request (HARQ), a fraction of uplink slots in case of time division duplex, BSR report interval, and a number of bits occupied by the BS field in the BSR.

12. The apparatus according to claim 9 , wherein the at least one reference BS table is associated with respective reference numerologies/transmission time-interval (TTI) lengths, BSR report interval, or HARQ RTTs, and wherein respective scaling factors are determined based on one of the respective reference numerologies/TTI lengths, BSR report interval, or HARQ RTTs and one of respective numerologies/TTI lengths, BSR report interval, or HARQ RTTs, that is associated with the at least one LCG.

13. The apparatus according to claim 9 , wherein selected LCGs are able to use a first format, and a selection of a subset of LCGs is based on at least one of a LCG/logical channel (LCH) priorities, a volume of available data for the LCG and service type of the LCG.

14. An apparatus at a network device for wireless communication, comprising:

a processor; and

a memory containing instructions which, when executed by the processor, cause the apparatus to perform operations to:

configure a terminal device with at least one logical channel group (LCG);

configure a buffer status report (BSR) format for the terminal device;

receive a BSR of the at least one LCG from the terminal device;

determine a buffer size (BS) table based on at least one reference BS table and a scaling factor, wherein BS values in the at least one reference BS table are multiplied by the scaling factor to generate the BS table for the at least one LCG; and

obtain respective BS values for the at least one LCG based on the BS table,

wherein the BSR format comprising a LCG identity (ID) field and a BS field for corresponding LCG, and wherein a size of the LCG ID field is configured based on a number of LCGs used by the terminal device.

15. The apparatus according to claim 14 , wherein the BS field occupies 5 bits, and the LCG ID field occupies 3 bits.

16. The apparatus for wireless communication according to claim 14 , wherein the at least one reference BS table is generated based on at least one of:

a maximum uplink transport block size, a maximum number of layers, a maximum number of component carriers (CCs), a maximum carrier bandwidth of each CC supported by the terminal device, a longest round trip time (RTT) length of a hybrid automatic repeat request (HARQ), a fraction of uplink slots in case of time division duplex, BSR report interval, and a number of bits occupied by the BS field in the BSR.