Tdd frame format

Abstract

A method of operating in a point-to-multipoint communication system with a base station and a plurality of remote stations, wherein the communication system enables transmission of data in a multicast mode with different Quadrature Amplitude Modulation (QAM) levels, carries switched point-to-point traffic without compromising the switched nature of the traffic in a broadcast environment, contains circuits for evaluating the Remote Station Identifier (RSI) and switch field tag portions of received Asynchronous Transfer Mode (ATM) cells using a series of registers to match the RSI and the unique remote address, and embeds multicast address data capable of identifying intended remote stations at varying QAM levels.

1 - 8 . (canceled)  
   
   
       9 . In a communication system with a base station and a plurality of remote stations, each remote station with circuits for evaluating RSI and switch tag field portions of received ATM cells, the method of operating in a broadcast mode comprising the steps of: 
 a. using the RSI as unique remote and broadcast address;    b. evaluating, at each of the plurality of remote stations, the RSI of the ATM cells for a match with the unique remote address of the evaluating remote station;    c. evaluating, at each of the plurality of remote stations, the RSI of the ATM cells for a match with a broadcast address of the evaluating remote station;    d. routing the cells by the evaluating remote station if a unique remote RSI match; and,    e. if the RSI matches the broadcast address of the evaluating remote station, evaluating the validity of the switch tag; and, using the switch tag for routing instructions where the switch tag is valid.    
   
   
       10 . The method of  claim 9 , wherein the communication system is a time division duplex communication system.  
   
   
       11 . The method of  claim 10 , wherein the communication system is an adaptive time division duplex communication system.  
   
   
       12 . The method of  claim 11 , wherein the communication system is for broadband short distance radio communication of bursty data from one computer network to another computer network.  
   
   
       13 . The method of  claim 12 , wherein step (d) further comprises the step of evaluating the validity of the switch tag prior to routing.  
   
   
       14 . The method of  claim 12 , wherein the remote stations have multiple broadcast addresses.  
   
   
       15 . The method of  claim 12 , wherein the switch tag is VPI or VPIIVCI.  
   
   
       16 . The method of  claim 12 , comprising the steps of: 
 a. Using a 1st register to match the RSI with the unique remote address;    b. Using a 2nd register to match the RSI with the broadcast address; and,    c. Using a 3rd register to determine the validity of the switch tag.    
   
   
       17 . The method of,  claim 12 , wherein cells with invalid switch tags are discarded.  
   
   
       18 . The method of  claim 12 , wherein broadcast mode is multicasting.  
   
   
       19 . The method of  claim 12 , where each remote has multiple switch tag field filters, each switch tag filter corresponding to a respective switch tag in a set of switch tags assigned to each remote.  
   
   
       20 . The method of  claim 12 , wherein each of the plurality of remote stations is capable of acting as the base station.  
   
   
       21 . In a communication system with a base station and a plurality of remote stations, each remote station with circuits for evaluating RSI and switch tag portions of received ATM cells, the method of operating in a broadcast mode comprising the steps of: 
 a. using the RSI as unique remote and broadcast address;    b. using a 1st register to match the RSI and the unique remote address;    c. using a 2nd register to match the RSI and the broadcast address;    d. using a 3rd register to determine whether the ATM cell's switch tag matches one in a set of switch tags assigned to the remote.    f. applying received cells to the 1st register and the 2nd register;    g. passing cells to router if they pass 1st register;    h. applying received cells to the 3rd register if they pass 2nd register; and,    i. passing cells to router if they pass 3rd register.    
   
   
       22 . The method of  claim 21 , wherein the communication system is a time division duplex communication system.  
   
   
       23 . The method of  claim 22 , wherein the communication system is an adaptive time division duplex communication system.  
   
   
       24 . The method of  claim 23 , wherein the communication system is for broadband short distance radio communication of bursty data from one computer network to another computer network.  
   
   
       25 . The method of  claim 24 , wherein each of the plurality of remote stations has multiple broadcast addresses.  
   
   
       26 . The method of  claim 24 , wherein the plurality of remotes shares a common broadcast address.  
   
   
       27 . The method of  claim 24 , wherein the switch tag is a VPI or VPIIVCI.  
   
   
       28 . The method of  claim 24 , wherein each of the plurality of remote stations is capable of acting as the base station.  
   
   
       29 - 30 . (canceled)  
   
   
       31 . In a point to multipoint communication system with a base station and a plurality of remotes, the method of multicasting to intended remotes using ATM protocol comprising the steps of: embedding a Temporary remote path identifier in each ATM cell; and filtering on the switch tag at each of the plurality of remotes.  
   
   
       32 . The method of  claim 31 , wherein the communication system is a time division duplex communication system.  
   
   
       33 . The method of  claim 32 , wherein the communication system is an adaptive time division duplex communication system.  
   
   
       34 . The method of  claim 33 , wherein the communication system is for broadband short distance radio communication of bursty data from one computer network to another computer network.  
   
   
       35 . The method of  claim 34 , wherein the temporary remote path identifier is a broadcast temporary remote path identifier recognized by each of the plurality of remotes.  
   
   
       36 . The method of  claim 34 , wherein the switch tag is a VPIIVCI.  
   
   
       37 . The method of  claim 34 , wherein the switch tag is a VPI.  
   
   
       38 - 49 . (canceled)