Enhanced resource unit allocation schemes for ofdma transmission in wlan

Abstract

Systems and methods of transmitting a PPDU to or from a single user station (STA) in an OFDMA transmission by using multiple RUs. An access point (AP) allocates multiple RUs to an STA for an OFDMA transmission and correspondingly specifies the STA ID repeatedly in the user specific field of a SIG-B field in a downlink PPDU, or in the user information fields of a trigger frame. Alternatively, multiple AIDs of the STA can be specified in the user specific field or the user information fields instead of repeating the same STA ID. An indication may be inserted in the SIG-A field to indicate that the enhanced RU allocation scheme is used for the OFDMA transmission.

What is claimed is: 
     
         1 . A method of wireless communication, the method comprising:
 allocating a first resource unit (RU) and a second RU for an Orthogonal frequency-division multiple access (OFDMA) transmission;   setting a common field of preamble of a Physical Layer Convergence Protocol (PLCP) protocol data unit (PPDU) to indicate multiple RU allocation;   encoding data associated with the first RU and data associated with the second RU using a Low Density Parity Check (LDPC) encoder; and   transmitting the PPDU in the OFDMA transmission, wherein the PPDU comprises the data associated with the first RU and the data associated with the second RU.   
     
     
         2 . The method of  claim 1 , further comprising performing LDPC tone mapping on the data associated with the first RU and the data associated with the second RU. 
     
     
         3 . The method of  claim 1 , further comprising performing LDPC tone mapping on the data associated with the first RU and the data associated with the second RU using an LDPC tone mapper 
     
     
         4 . The method of  claim 1 , further comprising performing constellation mapping on the first RU and the second RU separately and independently. 
     
     
         5 . The method of  claim 4 , wherein the performing constellation mapping on the first RU and the second RU uses different constellation schemes. 
     
     
         6 . The method of  claim 1 , further comprising:
 performing stream parsing for the first RU using a first stream parser; and   performing stream parsing for the second RU using a second stream parser.   
     
     
         7 . The method of  claim 1 , wherein the encoding data associated with the first RU and data associated with the second RU using a Low Density Parity Check (LDPC) encoder uses a same coding rate. 
     
     
         8 . The method of  claim 1 , wherein the OFDMA transmission is a downlink data transmission of the PPDU, and wherein the preamble further comprises multiple user fields contained in a SIG-B field indicating multiple RU allocation. 
     
     
         9 . A wireless communication device comprising:
 a processor that causes the wireless communication device to allocate a first resource unit (RU) and a second RU to a receive station for an Orthogonal frequency-division multiple access (OFDMA) transmission; and   a transceiver, configured to:
 setting a common field of preamble of a Physical Layer Convergence Protocol (PLCP) protocol data unit (PPDU) to indicate multiple RU allocation to the receive station; 
 encode data associated with the first RU and encode data associated with the second RU using a Low Density Parity Check (LDPC) encoder; and 
 transmit the PPDU in the OFDMA transmission, wherein the PPDU comprises the data associated with the first RU and the data associated with the second RU. 
   
     
     
         10 . The wireless communication device of  claim 9 , wherein the transceiver is further configured to perform LDPC tone mapping on the data associated with the first RU and the data associated with the second RU using an LDPC tone mapper. 
     
     
         11 . The wireless communication device of  claim 9 , wherein the encode data associated with the first RU is performed separately and independently from the encode data associated with the second RU. 
     
     
         12 . The wireless communication device of  claim 9 , wherein the transceiver is further configured to perform constellation mapping on the first RU and the second RU separately and independently. 
     
     
         13 . The wireless communication device of  claim 12 , wherein the encode data associated with the first RU and encode data associated with the second RU using a Low Density Parity Check (LDPC) encoder uses a same coding rate. 
     
     
         14 . The wireless communication device of  claim 9 , wherein the transceiver is further configured to:
 perform stream parsing for the first RU and using a first stream parser; and   perform stream parsing for the second RU and using a second stream parser.   
     
     
         15 . The wireless communication device of  claim 9 , wherein the transceiver is configured as an access point (AP) station and the receive station is a non-AP station, wherein the OFDMA transmission is a downlink data transmission of the PPDU, and wherein the preamble further comprises multiple user fields contained in a SIG-B field indicating multiple RU allocation to the receive station. 
     
     
         16 . A method of wireless communication, the method comprising:
 allocating a first resource unit (RU) and a second RU for an Orthogonal frequency-division multiple access (OFDMA) transmission;   setting a common field of preamble of a Physical Layer Convergence Protocol (PLCP) protocol data unit (PPDU) to indicate multiple RU allocation to the receive station;   performing LDPC tone mapping on data associated with the first RU and data associated with the second RU using an LDPC tone mapper; and   transmit the PPDU in the OFDMA transmission, wherein the PPDU comprises the data associated with the first RU and the data associated with the second RU.   
     
     
         17 . The method of  claim 16 , further comprising encoding data associated with the first RU and data associated with the second RU using a Low Density Parity Check (LDPC) encoder. 
     
     
         18 . The method of  claim 16 , further comprising parsing a stream associated with the first RU and a stream associated with the second RU using a stream parser. 
     
     
         19 . The method of  claim 16 , further comprising performing constellation mapping on the first RU and the second RU using a same constellation mapping. 
     
     
         20 . The method of  claim 16 , wherein the OFDMA transmission is a downlink data transmission of the PPDU, and wherein the preamble further comprises multiple user fields contained in a SIG-B field indicating multiple RU allocation.