METHOD FOR TRANSMITTING PPDU IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME

• US 20110249660A1
• Filed: 04/07/2011
• Published: 10/13/2011
• Est. Priority Date: 04/08/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: NOH, Yu Jin, LEE, Dae Won, SEOK, Yong Ho
• Granted Patent: US 8,873,582 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0085 when channel conditions change
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method of transmitting a data block in a wireless communication system is provided. The method includes generating a data block used for multi-user transmission, the data block comprising a first control field and a data field for a plurality of users, the first control field indicating multi-user transmission of the data block, the data field comprising a plurality of data units, each data unit comprising a PSDU(PLCP(Physical Layer Convergence Procedure) Service Data Unit) for each user and padding bits which are appended to the PSDU for each user; and transmitting the data block to the plurality of users; wherein the number of the padding bits in each data unit is determined so that lengths of the plurality of data units are same and the number of the padding bits in each data unit is determined by N_sym, N_DBPS,k, N_PSDU,k, where N_sym denotes the number of OFDM symbols of the data field, N_DBPS,k denotes the number of data bits per OFDM symbol for k-th user, and the N_PSDU,k denotes the length of the PSDU for k-th user.

Claims

1. A method of transmitting a data block in a wireless communication system, the method comprising:

generating a data block used for multi-user transmission, the data block comprising a first control field and a data field for a plurality of users, the first control field indicating multi-user transmission of the data block, the data field comprising a plurality of data units, each data unit comprising a PSDU(PLCP(Physical Layer Convergence Procedure) Service Data Unit) for each user and padding bits which are appended to the PSDU for each user, and

transmitting the data block to the plurality of users;

wherein the number of the padding bits in each data unit is determined so that lengths of the plurality of data units are same and,

the number of the padding bits in each data unit is determined by N_sym, N_DBPS,k, N_PSDU,k, where N_sym denotes the number of OFDM symbols of the data field, N_DBPS,k denotes the number of data bits per OFDM symbol for k-th user, and the N_PSDU,k denotes the length of the PSDU for k-th user.

2. The method of claim 1, wherein each data unit further comprises a service field indicating a scramble sequence used for scrambling the PSDU for each user and the padding bits, and the number of the padding bits in each data unit is determined by N_sym, N_DBPS,k, N_PSDU,k, where N_service denotes a length of the service field.

3. The method of claim 2, wherein each data unit further comprises a tail field indicating tail bits used for encoding the data field.

4. The method of claim 1, wherein the value of N_sym is same for the plurality of users.

5. The method of claim 4, further comprising:

determining a number of OFDM symbols N_sym,k used for transmission of a PSDU for k-th user;

selecting a maximum value among the plurality of N_sym,k as the N_sym.

6. The method of claim 1, wherein the number of the padding bits is between 0 and 7 inclusive.

7. The method of claim 1, wherein the data block further comprises a plurality of second control field for the plurality of users, each second control field indicating a length of the PSDU for each user.

8. The method of claim 1, wherein the data block is a PPDU(PLCP Protocol Data Unit).

9. A wireless apparatus comprising:

a processor; and

a transceiver operationally coupled to the processor to transmit and receive a data block, wherein the processor is configured for;

generating a data block used for multi-user transmission, the data block comprising a first control field and a data field for a plurality of users, the first control field indicating multi-user transmission of the data block, the data field comprising a plurality of data units, each data unit comprising a PSDU(PLCP(Physical Layer Convergence Procedure) Service Data Unit) for each user and padding bits which are appended to the PSDU for each user, and

transmitting the data block to the plurality of users;

wherein the number of the padding bits in each data unit is determined so that lengths of the plurality of data units are same and

the number of the padding bits in each data unit is determined by N_sym, N_DBPS,k, N_PSDU,k, where N_sym denotes the number of OFDM symbols of the data field, N_DBPS,k denotes the number of data bits per OFDM symbol for k-th user, and the N_PSDU,k denotes the length of the PSDU for k-th user.