Method and device for allocating resource in an OFDM network

Abstract

A radio station comprises means for allocating resources for communication with at least one other station, and including means for mapping data to be transmitted from at least the radio station to the at least one other station, and means for applying a cyclic shift to the data mapping, wherein this cyclic shift is adjusted depending on the number of data blocks to be mapped. A possible implementation concerns the mapping of the DVRB (Distributed Virtual Resource Block) in OFDM.

The invention claimed is: 
     
       1. A method for allocating resources for Orthogonal Frequency-Divisional Multiplexing (OFDM) communication between a primary station and at least one secondary station, comprising:
 mapping data to be transmitted from at least one transmitting station, being one of the primary station and the at least one secondary station, to at least one receiving station being one of the at least one secondary station and the said primary station, wherein 
 determining a cyclic shift based on a number of distributed virtual resource blocks, N d , to be mapped, wherein when N d  is a factor of a number of subcarriers N sc  NSC, wherein N sc  Mod Nd N d =0, and wherein the cyclic shift applied to an nth OFDM symbol is expressed as S(n)=S0 +F(n, N d ), where S0 is a shift applied to a first OFDM symbol (symbol index n=0); and 
 applying said cyclic shift to the mapped data. 
 
     
     
       2. The method of  claim 1  wherein a size of a difference in shift is dependent on the number of data blocks to be mapped in a distributed manner to a group of resource elements. 
     
     
       3. The method of  claim 1 , further comprising the step of grouping data symbols in groups mapped to contiguous resource elements, where the number of such contiguous resource elements in one group is equal to a number of transmit antennas, N t . 
     
     
       4. The method of  claim 1 , wherein the cyclic shift is a function of an identity of a cell of a primary station. 
     
     
       5. The method of  claim 1 , wherein the cyclic shift comprises at least one of: a shift in time, a shift in code, a shift in frequency and, or a shift in antenna, or any combination thereof. 
     
     
       6. A radio station comprising means for allocating a processor configured to allocate resources for Orthogonal Frequency-Divisional Multiplexing (OFDM) communication with at least one other station, said radio station comprising processor configured to:
 means for mappingmap data to be transmitted from at least the radio station to the at least one other station, 
 means for determiningdetermine a cyclic shift based on a number of distributed virtual resource blocks to be mapped, N d , wherein when N d  to be mapped is a factor of a number of subcarriers N sc  NSC, wherein N sc  Mod Nd N d =0, and wherein the cyclic shift applied to an nth OFDM symbol is expressed as S(n)=S0 +F(n, N d  ) n·Ns, where S0 is a shift a lied applied to a first OFDM symbol (symbol index n=0), wherein Ns is the additional shift applied to successive OFDM symbols, and the value of Ns depends on N d ; and 
 means for applying aapply the cyclic shift to the mapped data. 
 
     
     
       7. The radio station of  claim 6 , wherein a size of a difference in shift is dependent on the number of data blocks to be mapped in a distributed manner to a group of resource elements. 
     
     
       8. The radio station of  claim 6 , wherein the processor is further comprising configured to:
 groupinggroup data symbols in groups mapped to contiguous resource elements, where the number of such contiguous resource elements in one group is equal to a number of transmit antennas, N t . 
 
     
     
       9. The radio station of  claim 6 , wherein the cyclic shift is a function of an identity of a cell of the primary station. 
     
     
       10. The radio station of  claim 6 , wherein the cyclic shift comprises at least one of: a shift in time, a shift in code, a shift in frequency and, or a shift in antenna, or any combination thereof. 
     
     
       11. A method for allocating resources for Orthogonal Frequency-Divisional Multiplexing (OFDM) communication between a transmitting station and a receiving station, comprising:
 mapping data to be transmitted from the transmitting station to the receiving station, 
 determining a cyclic shift based on a number of distributed virtual resource blocks, N d , to be mapped, wherein when N d  is a factor of a number of subcarriers N sc NSC N sc , wherein N sc  Mod Nd N d =0, and wherein the cyclic shift applied to an nth OFDM symbol is expressed as S(n)=S0 +F(n, N d ), where S0 is a shift a lied applied to a first OFDM symbol (symbol index n=0); and 
 applying said cyclic shift to the mapped data. 
 
     
     
       12. The method of  claim 11 , wherein the cyclic shift is a function of an identity of a cell of the transmitting station. 
     
     
       13. The method of  claim 11 , wherein the cyclic shift comprises at least one of: a shift in time, a shift in code, a shift in frequency and, or a shift in antenna, or any combination thereof. 
     
     
       14. The method of  claim 11 , further comprising:
 grouping data symbols in groups mapped to contiguous resource elements, where the number of such contiguous resource elements in one group is equal to a number of transmit antennas, N t . 
 
     
     
       15. A radio station comprising:
 a transmitter circuit;   at least one antenna; and   a processor configured to allocate resources for Orthogonal Frequency-Divisional Multiplexing (OFDM) communication with at least one other station, the processor being configured to:   map data to be transmitted from the radio station to the at least one other station,   determine a cyclic shift based on a number of distributed virtual resource blocks to be mapped, N d , wherein N d  is a factor of a number of subcarriers N sc , wherein N sc  Mod N d =0, and wherein the cyclic shift applied to an nth OFDM symbol is expressed as S(n)=S0+F(n, N d ), where S0 is a shift applied to a first OFDM symbol (symbol index n=0); and   apply the cyclic shift to the mapped data.    
     
     
       16. The radio station of claim 15, wherein a size of a difference in shift is dependent on the number of data blocks to be mapped in a distributed manner to a group of resource elements.  
     
     
       17. The radio station of claim 15, wherein the processor is further configured to:
 group data symbols in groups mapped to contiguous resource elements, where the number of such contiguous resource elements in one group is equal to a number of transmit antennas, N t .    
     
     
       18. The radio station of claim 15, wherein the cyclic shift is a function of an identity of a cell of the primary station.  
     
     
       19. The radio station of claim 15, wherein the cyclic shift comprises at least one of: a shift in time, a shift in code, a shift in frequency, or a shift in antenna, or any combination thereof.