Assigning mobile users in a half-frequency division duplex (hfdd) system to uplink (ul) sub-frames and to downlink (dl) sub-frames

Abstract

Methods assigning mobile users in a half-frequency division duplex (HFDD) system to first and second UL groups of an uplink (UL) sub-frame, and to first and second UL groups of a downlink (DL) sub-frame, where the UL sub-frame has a first carrier frequency and the DL sub-frame has a second carrier frequency, are disclosed. One method includes determining a type of data, a receive CINR (carrier interference plus noise ratio), and a Doppler frequency parameter, for a plurality of mobile users. The mobile users to are assigned to the first UL group, second UL group, first DL group and second DL group based on time durations of the first UL group, second UL group, first DL group and second DL group, and at least one parameter of the determined parameters of the mobile users.

1 . A method of assigning a mobile user to one of a first uplink portion and a second uplink portion of an uplink sub-frame, and to one of a first downlink portion and a second downlink portion of a downlink sub-frame, the method comprising:
 determining a receive CINR (carrier to interference-plus-noise ratio) of the mobile user; and   assigning the mobile user to one of the first uplink portion and the second uplink portion of the uplink sub-frame, and to one of the first downlink portion and the second downlink portion of the downlink sub-frame based on the receive CINR.   
     
     
         2 . The method of  claim 1 , further comprising determining a number of mobile users currently assigned to each of the first uplink portion, the second uplink portion, the first downlink portion and the second downlink portion,
 wherein the assigning of the mobile user to one of the first uplink portion and the second uplink portion of the uplink sub-frame, and to one of the first downlink portion and the second downlink portion of the downlink sub-frame is based on the receive CINR and the number of mobile users currently assigned to each of the portions.   
     
     
         3 . The method of  claim 1 , farther comprising determining a Doppler frequency parameter associated with the mobile user,
 wherein the assigning of the mobile user to one of the first uplink portion and the second uplink portion of the uplink sub-frame, and to one of the first downlink portion and the second downlink portion of the downlink sub-frame is based on the receive CINR and the Doppler frequency parameter.   
     
     
         4 . The method of  claim 3 , further comprising determining a difference between the receive CINR and a function of the Doppler frequency parameter; and
 comparing the difference to a predetermined threshold,   wherein the downlink sub-frame includes a preamble portion, and   wherein, if the difference is less than the predetermined threshold, the mobile user is assigned to the one of the first downlink portion and the second downlink portion that is located furthest from the preamble portion within the downlink sub-frame.   
     
     
         5 . The method of  claim 1 , further comprising comparing the receive CINR to a predetermined threshold,
 wherein the first downlink portion has a different duration than the second downlink portion, and the first uplink portion has a different duration than the second uplink portion.   
     
     
         6 . The method of  claim 5 , wherein if the receive CINR is below the predetermined threshold, the mobile user is assigned to the one of the first downlink portion and the second downlink portion that is longer in duration. 
     
     
         7 . The method of  claim 5 , wherein if the receive CINR is below the predetermined threshold, the mobile user is assigned to the one of the first uplink portion and the second uplink portion that is longer is duration. 
     
     
         8 . A method of assigning a mobile user to one of a first communication group and a second communication group, the first communication group including a first downlink portion of a downlink sub-frame and a first uplink portion of an uplink sub-frame, the second communication group including a second downlink portion of the downlink sub-frame and a second uplink portion of the uplink sub-frame, the method comprising:
 determining a receive CINR (carrier to interference-plus-noise ratio) of the mobile user;   determining whether the mobile user is communicating using voice over internet protocol (VoIP); and   assigning the mobile user to one of the first communication group and the second communication group based on at least one of the receive CINR and whether the mobile user is using VoIP.   
     
     
         9 . The method of  claim 8 , wherein the first downlink portion has a different duration than the second downlink portion, and the first uplink portion has a different duration than the second uplink portion. 
     
     
         10 . The method of  claim 9 , further comprising determining whether the mobile user is one of talking or listening using the voice over internet protocol. 
     
     
         11 . The method of  claim 10 , wherein the determining of whether the mobile user is one of talking or listening is performed by comparing an uplink usage of the mobile user to a predetermined threshold. 
     
     
         12 . The method of  claim 11 , wherein if the uplink usage of the mobile user is above the predetermined threshold, the mobile user is assigned to the communication group that includes the one of the first uplink portion or the second uplink portion that has the longer duration. 
     
     
         13 . The method of  claim 11 , wherein if the uplink usage of the mobile user is below the predetermined threshold, the mobile user is assigned to the communication group that includes the one of the first downlink portion or the second downlink portion that has the longer duration. 
     
     
         14 . A wireless communication device capable of assigning a mobile user to one of a first communication group and a second communication group, the first communication group including a first downlink portion of a downlink sub-frame and a first uplink portion of an uplink sub-frame, the second communication group including a second downlink portion of the downlink sub-frame and a second uplink portion of the uplink sub-frame, the wireless communication device comprising:
 one or more processor configured to:
 determine a receive CINR (carrier to interference-plus-noise ratio) of the mobile user; and 
 assign the mobile user to one of the first communication group and the second communication group based on at least one of the receive CINR and another parameter. 
   
     
     
         15 . The wireless communication device of  claim 14 , wherein the first downlink portion has a different duration than the second downlink portion, and the first uplink portion has a different duration than the second uplink portion. 
     
     
         16 . The wireless communication device of  claim 15 , wherein the one or more processor is further configured to compare an uplink bit rate of the mobile user to a downlink bit rate of the mobile user. 
     
     
         17 . The wireless communication device of  claim 16 , wherein if the uplink bit rate exceeds the downlink bit rate, the one or more processor is configured to assign the mobile user to the communication group that includes the one of the first uplink portion or the second uplink portion that has the longer duration. 
     
     
         18 . The wireless communication device of  claim 16 , wherein if the uplink bit rate is below the downlink bit rate, the one or more processor is configured to assign the mobile user to the communication group that includes the one of the first downlink portion or the second downlink portion that has the longer duration. 
     
     
         19 . The wireless communication device of  claim 15 , wherein the one or more processor is further configured to compare the receive CINR to a predetermined threshold, and
 wherein if the receive CINR is below the predetermined threshold, the mobile user is assigned to the communication groups that includes the one of the first downlink portion and the second downlink portion that is longer in duration.   
     
     
         20 . The wireless communication device of  claim 15 , wherein the one or more processor is further configured to compare the receive CINR to a predetermined threshold, and
 wherein if the receive CINR is below the predetermined threshold, the mobile user is assigned to the communication group that includes the one of the first uplink portion and the second uplink portion that is longer is duration.