Abstract:
This invention notes various patterns of uplink and downlink communication in a wireless communication system which satisfy the requirement that a user equipment receiving a downlink grant in subframe n needs to transmit response ACK/NAK bits in an uplink subframe n+k, where k&gt;3 and a user equipment receiving a DL grant or ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in subframe n needs to transmit or retransit UL data bits in an uplink (UL) subframe n+k, where k&gt;3.

Description:
CLAIM OF PRIORITY 
       [0001]    This application claims priority under 35 U.S.C. 119(e)(1) to U.S. Provisional Application No. 61/038,899 filed Mar. 24, 2008. 
     
    
     TECHNICAL FIELD OF THE INVENTION 
       [0002]    The technical field of this invention is wireless communication. 
       BACKGROUND OF THE INVENTION 
       [0003]      FIG. 1  shows an exemplary wireless telecommunications network  100 . The illustrative telecommunications network includes base stations  101 ,  102  and  103 , though in operation, a telecommunications network necessarily includes many more base stations. Each of base stations  101 ,  102  and  103  are operable over corresponding coverage areas  104 ,  105  and  106 . Each base station&#39;s coverage area is further divided into cells. In the illustrated network, each base station&#39;s coverage area is divided into three cells. Handset or other user equipment (UE)  109  is shown in Cell A  108 . Cell A  108  is within coverage area  104  of base station  101 . Base station  101  transmits to and receives transmissions from UE  109 . As UE  109  moves out of Cell A  108  and into Cell B  107 , UE  109  may be handed over to base station  102 . Because UE  109  is synchronized with base station  101 , UE  109  can employ non-synchronized random access to initiate handover to base station  102 . 
         [0004]    Non-synchronized UE  109  also employs non-synchronous random access to request allocation of up-link  111  time or frequency or code resources. If UE  109  has data ready for transmission, which may be traffic data, measurements report, tracking area update, UE  109  can transmit a random access signal on up-link  111 . The random access signal notifies base station  101  that UE  109  requires up-link resources to transmit the UE&#39;s data. Base station  101  responds by transmitting to UE  109  via down-link  110 , a message containing the parameters of the resources allocated for UE  109  up-link transmission along with a possible timing error correction. After receiving the resource allocation and a possible timing advance message transmitted on down-link  110  by base station  101 , UE  109  optionally adjusts its transmit timing and transmits the data on up-link  111  employing the allotted resources during the prescribed time interval. 
         [0005]      FIG. 2  shows the Evolved Universal Terrestrial Radio Access (E-UTRA) time division duplex (TDD) Frame Structure. Different subframes are allocated for downlink (DL) or uplink (UL) transmissions. Table 1 shows applicable DL/UL subframe allocations. 
         [0000]    
       
         
               
               
               
             
               
               
               
               
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                   
                 Switch- 
                   
               
               
                 Con- 
                 point 
                 Subframe number 
               
             
          
           
               
                 figuration 
                 periodicity 
                 0 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 0 
                  5 ms 
                 D 
                 S 
                 U 
                 U 
                 U 
                 D 
                 S 
                 U 
                 U 
                 U 
               
               
                 1 
                  5 ms 
                 D 
                 S 
                 U 
                 U 
                 D 
                 D 
                 S 
                 U 
                 U 
                 D 
               
               
                 2 
                  5 ms 
                 D 
                 S 
                 U 
                 D 
                 D 
                 D 
                 S 
                 U 
                 D 
                 D 
               
               
                 3 
                 10 ms 
                 D 
                 S 
                 U 
                 U 
                 U 
                 D 
                 D 
                 D 
                 D 
                 D 
               
               
                 4 
                 10 ms 
                 D 
                 S 
                 U 
                 U 
                 D 
                 D 
                 D 
                 D 
                 D 
                 D 
               
               
                 5 
                 10 ms 
                 D 
                 S 
                 U 
                 D 
                 D 
                 D 
                 D 
                 D 
                 D 
                 D 
               
               
                 6 
                 10 ms 
                 D 
                 S 
                 U 
                 U 
                 U 
                 D 
                 S 
                 U 
                 U 
                 D 
               
               
                   
               
             
          
         
       
     
         [0006]    One interesting property of TDD is that the number of UL and DL subframes can be different. In the configurations where there are more DL subframes than UL subframes, multiple DL subframes are associated with one single UL subframe for transmission of corresponding control signal. For example, for each dynamically scheduled transmission in the DL subframes, acknowledge and non-acknowledge (ACK/NAK) bits need to be transmitted in an associated UL subframe to support proper hybrid automatic repeat request (HARQ) operation. If UE  109  is scheduled in a multiple of DL subframes all of which are associated with one single UL subframe, UE  109  needs to transmit multiple ACK/NAK bits in that single UL subframe. 
       SUMMARY OF THE INVENTION 
       [0007]    This invention notes various patterns of uplink and downlink communication in a wireless communication system which satisfy the requirement that a user equipment receiving a downlink grant in subframe n needs to transmit response ACK/NAK bits in an uplink subframe n+k, where k&gt;3 and a user equipment receiving a DL grant or ACK/NAK on physical hybrid automatic repeat request channel (PHICH) in subframe n needs to transmit or retransmit UL data bits in an uplink (UL) subframe n+k, where k&gt;3. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    These and other aspects of this invention are illustrated in the drawings, in which: 
           [0009]      FIG. 1  is a diagram of a communication system of the prior art related to this invention having three cells; 
           [0010]      FIG. 2  shows the Evolved Universal Terrestrial Radio Access (E-UTRA) TDD Frame Structure of the prior art; 
           [0011]      FIG. 3  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  0 ; 
           [0012]      FIG. 4  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  1 ; 
           [0013]      FIG. 5  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  2 ; 
           [0014]      FIG. 6  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  3 ; 
           [0015]      FIG. 7  illustrates a first alternative of ACK/NAK response paths for a downlink/uplink subframe configuration  3 ; 
           [0016]      FIG. 8  illustrates a second alternative of ACK/NAK response paths for a downlink/uplink subframe configuration  3 ; 
           [0017]      FIG. 9  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  4 ; 
           [0018]      FIG. 10  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  5 ; 
           [0019]      FIG. 11  illustrates the ACK/NAK response paths for a downlink/uplink subframe configuration  6 ; 
           [0020]      FIG. 12  illustrates the UL data response paths for a DL/UL subframe configuration  0 ; 
           [0021]      FIG. 13  illustrates an alternate UL data response paths for a DL/UL subframe configuration  0 ; 
           [0022]      FIG. 14  illustrates the UL data response paths for a DL/UL subframe configuration  1 ; 
           [0023]      FIG. 15  illustrates the UL data response paths for a DL/UL subframe configuration  2 ; 
           [0024]      FIG. 16  illustrates the UL data response paths for a DL/UL subframe configuration  3 ; 
           [0025]      FIG. 17  illustrates the UL data response paths for a DL/UL subframe configuration  4 ; 
           [0026]      FIG. 18  illustrates the UL data response paths for a DL/UL subframe configuration  5 ; and 
           [0027]      FIG. 19  illustrates the UL data response paths for a DL/UL subframe configuration  6 . 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0028]    The 3GPP TS 36.211 standard requires in time division duplex (TDD) downlink (DL) that a UE  109  receiving a DL grant in subframe n needs to transmit response ACK/NAK bits in an uplink (UL) subframe n+k, where k&gt;3.  FIGS. 3 to 11  illustrate the relation between DL/UL subframes associations for various combinations of assignments of DL/UL to particular subframes. Each of theses relations illustrated in  FIGS. 3 to 11  are compliant with the requirement of the standard.  FIGS. 3 to 11  illustrate frames  310 ,  320  and  330 . Each frame  310 ,  320  and  330  has subframes  0  to  9 . Subframes  0  and  5  are shaded to aid in determining the subframe alignment in the drawings. 
         [0029]      FIG. 3  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  0  where subframes  0 ,  1 ,  5  and  6  are devoted to DL and subframes  2 ,  3 ,  4 ,  7 ,  8  and  9  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  4 . A UE  109  receiving a DL grant in subframe  1  transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  5  transmits a responsive ACK/NAK signal in subframe  9 . A UE  109  receiving a DL grant in subframe  6  transmits a responsive ACK/NAK signal in subframe  1  of the next frame. Each of the UL subframes  2 ,  4 ,  7  and  9  receive DL grant signals from a single DL subframe. UL subframes  3 ,  5  and  8  receive DL grant signals from no DL subframe. 
         [0030]      FIG. 4  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  1  where subframes  0 ,  1 ,  4 ,  5 ,  6  and  9  are devoted to DL and subframes  2 ,  3 ,  7  and  8  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  1  also transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  4  transmits a responsive ACK/NAK signal in subframe  8 . A UE  109  receiving a DL grant in subframe  5  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  9  transmits a responsive ACK/NAK signal in subframe  3  of the next frame. Each of the UL subframes  2  and  7  receive DL grant signals from two DL subframes. Each of UL subframes  3  and  8  receive DL grant signals from one DL subframe. 
         [0031]      FIG. 5  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  2  where subframes  0 ,  1 ,  3 ,  4 ,  5 ,  6 ,  8  and  9  are devoted to DL and subframes  2  and  7  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  1  also transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  3  also transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  4  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  8  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  9  transmits a responsive ACK/NAK signal in subframe  7  of the next frame. Each of the UL subframes  2  and  7  receive DL grant signals from four DL subframes. 
         [0032]      FIG. 6  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  3  where subframes  0 ,  1 ,  5 ,  6 ,  7 ,  8  and  9  are devoted to DL and subframes  2 ,  3  and  4  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  4 . A UE  109  receiving a DL grant in subframe  1  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  7  transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  8  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  9  transmits a responsive ACK/NAK signal in subframe  3  of the next frame. UL subframe  2  receives DL grant signals from three DL subframes. Each of the UL subframes  3  and  4  receive DL grant signals from two DL subframes. 
         [0033]      FIG. 7  illustrates a first alternate of the ACK/NAK response paths for a DL/UL subframe configuration  3  where subframes  0 ,  1 ,  5 ,  6 ,  7 ,  8  and  9  are devoted to DL and subframes  2 ,  3  and  4  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  4 . A UE  109  receiving a DL grant in subframe  1  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  7  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  8  transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  9  transmits a responsive ACK/NAK signal in subframe  3  of the next frame. UL subframe  2  receives DL grant signals from five DL subframes. Each of the UL subframes  3  and  4  receive DL grant signals from one DL subframe. 
         [0034]      FIG. 8  illustrates a second alternative of the ACK/NAK response paths for a DL/UL subframe configuration  3  where subframes  0 ,  1 ,  5 ,  6 ,  7 ,  8  and  9  are devoted to DL and subframes  2 ,  3  and  4  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  4 . A UE  109  receiving a DL grant in subframe  1  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  7  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  8  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  9  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. UL subframe  2  receives DL grant signals from four DL subframes. UL subframe  3  receives DL grant signals from two DL subframes. UL subframe  4  receives DL grant signal form a single DL subframe. 
         [0035]      FIG. 9  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  4  where subframes  0 ,  1 ,  4 ,  5 ,  6 ,  7 ,  8  and  9  are devoted to DL and subframes  2  and  3  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  1  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  4  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant on subframe  6  transmits a responsive ACK/NAK signal on subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  7  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  8  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  9  also transmits a responsive ACK/NAK signal in subframe  3  of the next frame. Each of UL subframes  2  and  3  receives DL grant signals from four DL subframes. 
         [0036]      FIG. 10  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  5  where subframes  0 ,  1 ,  3 ,  4 ,  5 ,  6 ,  7 ,  8  and  9  are devoted to DL and subframe  2  is devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  1  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  4  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant on subframe  6  also transmits a responsive ACK/NAK signal on subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  7  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  8  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant in subframe  9  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. UL subframe  2  receives DL grant signals from nine DL subframes. 
         [0037]      FIG. 11  illustrates the ACK/NAK response paths for a DL/UL subframe configuration  6  where subframes  0 ,  1 ,  5 ,  6  and  9  are devoted to DL and subframes  2 ,  3 ,  4 ,  7  and  8  are devoted to UL. A UE  109  receiving a DL grant in subframe  0  transmits a responsive ACK/NAK signal in subframe  7 . A UE  109  receiving a DL grant in subframe  1  transmits a responsive ACK/NAK signal in subframe  8 . A UE  109  receiving a DL grant in subframe  5  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant on subframe  6  transmits a responsive ACK/NAK signal on subframe  3  of the next frame. A UE  109  receiving a DL grant in subframe  9  transmits a responsive ACK/NAK signal in subframe  4  of the next frame. Each of UL subframes  2 ,  3 ,  4 ,  7  and  8  receive DL grant signals from a single DL subframe. 
         [0038]    These response patterns are summarized in Table 2. Table 2 shows the DL subframes containing DL grants, as well as UL subframes containing ACK/NAK to support DL HARQ. The first column of Table 2 lists the configuration as noted above. The second column of Table 2 indicates the UL subframe used for the required ACK/NAK for each DL subframe. The third column of Table 2 indicates the number of DL subframes associated with each UL subframe. 
         [0000]    
       
         
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 DL/UL 
                 DL Subframe Containing DL 
                 UL Subframe 
               
               
                 Config 
                 Grant and DL Data 
                 Containing ACK/NAK 
               
               
                   
               
             
             
               
                 0 
                 0-4 1-7 5-9 6-2 
                 2(1) 4(1) 7(1) 9(1) 
               
               
                 1 
                 0-7 1-7 4-8 5-2 
                 2(2) 3(1) 7(2) 8(1) 
               
               
                   
                 6-2 9-3 
               
               
                 2 
                 0-7 1-7 3-7 4-2 
                 2(4) 7(4) 
               
               
                   
                 5-2 6-2 8-2 9-7 
               
               
                 3 
                 0-4 1-2 5-2 6-2 
                 2(3) 3(2) 4(2) 
               
               
                   
                 7-3 8-3 9-4 
               
               
                 3, Alt1 
                 0-4 1-2 5-2 6-2 
                 2(5) 3(1) 4(1) 
               
               
                   
                 7-2 8-2 9-3 
               
               
                 3, Alt2 
                 0-4 1-2 5-2 6-2 
                 2(4) 3(2) 4(1) 
               
               
                   
                 7-2 8-3 9-3 
               
               
                 4 
                 0-2 1-2 4-2 5-2 
                 2(4) 3(4) 
               
               
                   
                 6-3 7-3 8-3 9-3 
               
               
                 5 
                 0-2 1-2 3-2 4-2 5-2 
                 2(9) 
               
               
                   
                 6-2 7-2 8-2 9-2 
               
               
                 6 
                 0-7 1-8 5-2 6-3 9-4 
                 2(1) 3(1) 4(1) 7(1) 8(1) 
               
               
                   
               
             
          
         
       
     
         [0039]    The 3GPP TS 36.211 standard requires in time division duplex (TDD) uplink (UL) that a UE  109  receiving a DL grant or ACK/NAK on physical hybrid repeat request channel (PHICH) in subframe n needs to transmit or retransmit UL data bits in an uplink (UL) subframe n+k, where k&gt;3.  FIGS. 12 to 19  illustrate the relation between DL/UL subframes associations for various combinations of assignments of DL/UL to particular subframes. Each of theses relations illustrated in  FIGS. 12 to 19  are compliant with the requirement of the standard.  FIGS. 12 to 19  illustrate frames  310 ,  320  and  330 . Each frame  310 ,  320  and  330  has subframes  0  to  9 . Subframes  0  and  5  are shaded to aid in determining the subframe alignment in the drawings. 
         [0040]      FIG. 12  illustrates the UL data response paths for a DL/UL subframe configuration  0  where subframes  0 ,  1 ,  5  and  6  are devoted to DL and subframes  2 ,  3 ,  4 ,  7 ,  8  and  9  are devoted to UL. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  0  transmits UL data in subframes  4  or  7 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  1  transmits UL data in subframe  8 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  5  transmits UL data in subframe  9  or subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  6  transmits UL data in subframe  3  of the next frame. A responding UE  109  transmits UL data in subframes  2 ,  3 ,  4 ,  7 ,  8  or  9 . 
         [0041]      FIG. 13  illustrates an alternative for the UL DATA response paths for DL/UL subframe configuration  0  where subframes  0 ,  1 ,  5  and  6  are devoted to DL and subframes  2 ,  3 ,  4 ,  7 ,  8  and  9  are devoted to UL. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  0  transmits UL data in subframe  4 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  1  transmits UL data in subframes  7  or  8 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  5  transmits UL data in subframe  9  or subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  6  transmits UL data in subframes  2  or  3  of the next frame. A responding UE  109  transmits UL data in subframes  2 ,  3 ,  4 ,  7 ,  8  or  9 . 
         [0042]      FIG. 14  illustrates the UL DATA response paths for a DL/UL subframe configuration  1  where subframes  1 ,  4 ,  5 ,  6  and  9  are devoted to DL and subframes  2 ,  3 ,  7  and  8  are devoted to UL. Note that subframes  0  and  6  nominally noted as a DL subframe cannot be used for DL grant or an ACK/NAK on PHICH. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  1  transmits UL data in subframe  7 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  4  transmits UL data in subframe  8 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  6  also transmits a responsive ACK/NAK signal in subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  9  transmits UL data in subframe  3  of the next frame. A responding UE  109  transmits UL data in subframes 
         [0043]      FIG. 15  illustrates the UL DATA response paths for a DL/UL subframe configuration  2  where subframes  3  and  8  are devoted to DL and subframes  2  and  7  are devoted to UL. Note that subframes  0 ,  1 ,  4 ,  5 ,  6  and  9  nominally noted as a DL subframes cannot be used for DL grant or an ACK/NAK on PHICH. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  3  also transmits UL data in subframe  7 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  8  transmits UL data in subframe  2  of the next frame. A responding UE  109  transmits UL data in subframes  2  and  7 . 
         [0044]      FIG. 16  illustrates the UL DATA response paths for a DL/UL subframe configuration  3  where subframes  0 ,  8  and  9  are devoted to DL and subframes  2 ,  3  and  4  are devoted to UL. Note that subframes  1 ,  5 ,  6 ,  7  nominally noted as DL subframes cannot be used for DL grant or an ACK&gt;NAK on PHICH. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  0  transmits UL data in subframe  4 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  8  transmits UL data in subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  9  transmits UL data in subframe  3  of the next frame. A responding UE  109  transmits UL data in subframes  2 ,  3  and  4 . 
         [0045]      FIG. 17  illustrates the UL DATA response paths for a DL/UL subframe configuration  4  where subframes  8  and  9  are devoted to DL and subframes  2  and  3  are devoted to UL. Note that subframes  0 ,  1 ,  4 ,  5 ,  6  and  7  nominally DL subframes cannot be used for DL grant or an ACK/NAK on PHICH. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  8  transmits UL data in subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  9  transmits UL data in subframe  3  of the next frame. A responding UE  109  transmits UL data in subframes  2  and  3 . 
         [0046]      FIG. 18  illustrates the UL DATA response paths for a DL/UL subframe configuration  5  where subframe  8  is devoted to DL and subframe  2  is devoted to UL. Note that subframes  0 ,  1 ,  3 ,  4 ,  5 ,  6 ,  7  and  9  nominally noted as DL subframes cannot be used to transmit a DL grant or and ACK/NAK on PHICH. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  8  transmits UL data in subframe  2  of the next frame. A responding UE  109  transmits UL data in subframe  2 . 
         [0047]      FIG. 19  illustrates the UL DATA response paths for a DL/UL subframe configuration  6  where subframes  0 ,  1 ,  5 ,  6  and  9  are devoted to DL and subframes  2 ,  3 ,  4 ,  7  and  8  are devoted to UL. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  0  transmits UL data in subframe  7 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  1  transmits UL data in subframe  8 . A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  5  also transmits UL data in subframe  2  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH on subframe  6  transmits UL data on subframe  3  of the next frame. A UE  109  receiving a DL grant or an ACK/NAK on PHICH in subframe  9  transmits UL data in subframe  4  of the next frame. A responding UE  109  transmits UL data in subframes  2 ,  3 ,  4 ,  7  and  8 . 
         [0048]    These response patterns are summarized in Table 2. Table 3 shows the DL subframes containing DL grants or ACK/NAKs on PHICH. The first column of Table 3 lists the configuration as noted above. The second column of Table 3 indicates the UL subframe used for the required UL data for each DL subframe. The third column of Table 3 indicates the number of subframes used for the UL data response. 
         [0000]    
       
         
               
               
               
               
             
           
               
                   
                 TABLE 3 
               
               
                   
                   
               
               
                   
                 DL/UL 
                 DL Subframe Containing UL 
                 UL Subframe 
               
               
                   
                 Config 
                 Grant or ACK/NAK (PHICH) 
                 Containing Data 
               
               
                   
                   
               
             
             
               
                   
                 0 
                 0(4, 7) 1(8) 5(9, 2) 6(3) 
                 2 3 4 7 8 9 
               
               
                   
                 0 Alt 
                 0(4) 1(7, 8) 5(9) 6(2, 3) 
                 2 3 4 7 8 9 
               
               
                   
                 1 
                 1(7) 4(8) 6(2) 9(3) 
                 2 3 7 8 
               
               
                   
                 2 
                 3(7) 8(2) 
                 2 7 
               
               
                   
                 3 
                 0(4) 8(2) 9(3) 
                 2 3 4 
               
               
                   
                 4 
                 8(2) 9(3) 
                 2 3 
               
               
                   
                 5 
                 8(2) 
                 2 
               
               
                   
                 6 
                 0(7) 1(8) 5(2) 6(3) 9(4) 
                 2 3 4 7 8