SOFT BUFFER SIZE DETERMINATION METHOD FOR DUAL CONNECTIVITY

• US 20150282138A1
• Filed: 03/31/2015
• Published: 10/01/2015
• Est. Priority Date: 03/31/2014
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: CHOI, Seunghoon, KIM, Youngbum, JI, Hyoungju
• Application Number:
  US14/674,671
• Publication Number:
  US 20150282138A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1664 the supervisory signal being transmitted together with payload signals; piggybacking
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided

Abstract

A method for a dual connectivity-enabled terminal which receives downlink data from at least one of a macro and a pico base station to transmit uplink control information corresponding to downlink data is provided. The method includes receiving the downlink data from a base station, determining whether the terminal is configured with a secondary cell group (SCG), determining, if the terminal is configured with the SCG, a size of a soft buffer per code block per cell based on a number of configured serving cells of the terminal, and storing the received downlink data in the soft buffer based on the size of the soft buffer per code block per cell, wherein the configured serving cells are included in a master cell group (MCG) and the SCG.

Claims

1. A method of a terminal for receiving downlink data in communication system supporting dual connectivity, the method comprising:

receiving the downlink data from a base station;

determining whether the terminal is configured with a secondary cell group (SCG);

determining, if the terminal is configured with the SCG, a size of a soft buffer per code block per cell based on a number of configured serving cells of the terminal; and

storing the received downlink data in the soft buffer based on the size of the soft buffer per code block per cell,

wherein the configured serving cells are included in a master cell group (MCG) and the SCG.

2. The method of claim 1, wherein the storing of the received downlink data comprises storing soft channel bits included in the received downlink data in the soft buffer.

3. The method of claim 2, wherein the storing of the received downlink data comprises discarding, if the soft channel bits included in the received downlink data are more than the size of the soft buffer per code block per cell, soft channel bits which are more than the size.

4. The method of claim 2, wherein the storing of the received downlink data comprises storing the received channel bits corresponding to a range of at least w_k, w_k+1, . . . , w_{mod (k+n—}

<sub>SB-1, N—

cb)</sub>, where;

5. The method of claim 1, further comprising:

receiving information on an available size of the soft buffer per code block from the base station,

wherein the determining of the size of the soft buffer per code block per cell is further based on the received information on the available size of the soft buffer per code block.

6. The method of claim 1, wherein the received downlink data is generated based on an available size of the soft buffer of the terminal.

7. The method of claim 6, wherein the available size of the soft buffer comprises the size of a soft buffer assigned to the MCG and the SCG.

8. A method for transmitting downlink data of a base station in communication system supporting dual connectivity, the method comprising:

configuring a secondary cell group (SCG) to a terminal;

generating the downlink data to be transmitted to the terminal based on an available size of a soft buffer of the terminal; and

transmitting the generated downlink data to the terminal,

wherein the transmitted downlink data is stored in the soft buffer of the terminal,

wherein a size of the soft buffer per code block per cell is determined based on a number of configured serving cells of the terminal, and

wherein the configured serving cells are included in a master cell group (MCG) and the SCG.

9. The method of claim 8, further comprising transmitting information on an available size of the soft buffer per code block to the terminal,

wherein the size of the soft buffer per code block per cell is determined further based on the transmitted information on the available size of the soft buffer per code block.

10. A terminal for receiving downlink data in communication system supporting dual connectivity, the terminal comprising:

a transceiver configured to transmit and receive a signal;

a controller configured;

to receive the downlink data from a base station,

to determine whether the terminal is configured with a secondary cell group (SCG),

to determine, if the terminal is configured with the SCG, a size of a soft buffer per code block per cell based on a number of configured serving cells of the terminal, and

to store the received downlink data in the soft buffer based on the size of the soft buffer per code block per cell,

wherein the configured serving cells are included in a master cell group (MCG) and the SCG.

11. The terminal of claim 10, wherein the controller is further configured to store soft channel bits included in the received downlink data in the soft buffer.

12. The terminal of claim 11, wherein the controller is further configured to discard, if the soft channel bits included in the received downlink data are more than the size of the soft buffer per code block per cell, soft channel bits which are more than the size.

13. The terminal of claim 11, wherein the controller is further configured to store the received channel bits corresponding to a range of at least w_k, w_k+1, . . . , w_mod(k+n—

<sub>SB-1, N—

cb)</sub>, where;

14. The terminal of claim 10, wherein the controller is further configured:

to receive information on an available size of the soft buffer per code block from the base station, and

to determine the size of the soft buffer per code block per cell further based on the received information on the available size of the soft buffer per code block.

15. The terminal of claim 10, wherein the received downlink data is generated based on an available size of the soft buffer of the terminal.

16. The terminal of claim 15, wherein the available size of the soft buffer comprises the size of a soft buffer assigned to the MCG and the SCG.

17. A base station for transmitting downlink data in communication system supporting dual connectivity, the base station comprising:

a transceiver configured to transmit and receive a signal;

a controller configured;

to configure a secondary cell group (SCG) to a terminal,

to generate the downlink data to be transmitted to the terminal based on an available size of a soft buffer of the terminal, and

to transmit the generated downlink data to the terminal,

wherein the transmitted downlink data is stored in the soft buffer of the terminal,

wherein a size of the soft buffer per code block per cell is determined based on a number of configured serving cells of the terminal, and

wherein the configured serving cells are included in a master cell group and the SCG.

18. The base station of claim 17,

wherein the controller is further configured to transmit information on an available size of the soft buffer per code block to the terminal, and

wherein the size of the soft buffer per code block per cell is determined further based on the transmitted information on the available size of the soft buffer per code block.