Tti adaptation in e-dch

Abstract

An apparatus, comprising at least one processor configured to dynamically change a timing parameter, such as a Transmission Timing Interval for an E-DCH resource for a second apparatus in a cell.

1 . A mobile terminal that uses an allocated first or second common Enhanced Dedicated Channel (E-DCH) resource from a selection of common E-DCH resources available in a cell and determines a transmission time interval (TTI) and an associated Absolute Grant Channel (AGCH) of the allocated first or second common E-DCH resource, the mobile terminal comprising:
 circuitry configured to
 receive a System Information Block (SIB) including an information element indicating a first TTI or a second TTI for each AGCH, wherein the second TTI is longer that the first TTI; 
 transmit data based on the indicated TTI and AGCH for the allocated first or second common E-DCH resource, wherein the first common E-DCH resource has an AGCH with the first TTI, and the second common E-DCH resource has an AGCH with the second TTI; and 
 dynamically change the TTI between the first TTI and the second TTI based on signaling received from a network indicating that the second common E-DCH resource has been allocated to the mobile terminal. 
   
     
     
         2 . The mobile terminal of  claim 1 , wherein
 the first TTI is 2 ms and the second TTI is 10 ms.   
     
     
         3 . The mobile terminal of  claim 1 , wherein
 the circuitry is configured to dynamically change the TTI while the information element remains unmodified.   
     
     
         4 . The mobile terminal of  claim 1 , wherein
 the AGCH for each of the first and second common E-DCH resources is indicated by an AGCH selector index.   
     
     
         5 . The mobile terminal of  claim 1 , wherein
 the circuitry is configured to transmit information indicating a radio condition of the mobile terminal.   
     
     
         6 . The mobile terminal of  claim 1 , wherein
 the signaling received from the network to dynamically change between the first TTI and the second TTI is based on a radio condition of the mobile terminal.   
     
     
         7 . The mobile terminal of  claim 1 , wherein
 the signaling received from the network to dynamically change between the first TTI and the second TTI is based on detecting and evaluating a change in a radio condition of the mobile terminal and scheduling and allocating the second common E-DCH resource to the mobile terminal.   
     
     
         8 . The mobile terminal of  claim 1 , wherein
 the circuitry is configured to transmit a request for allocation of a specific one of the first or second common E-DCH resource.   
     
     
         9 . The mobile terminal of  claim 1 , wherein
 the circuitry is a chipset of the mobile terminal.   
     
     
         10 . A wireless terminal comprising:
 circuitry configured to
 receive information identifying a first common Enhanced Dedicated Channel (E-DCH) resource allocated to the wireless terminal and a first transmission time interval (TTI) corresponding to the first common E-DCH; 
 transmit data via the first E-DCH resource according to the first TTI; 
 switch from transmitting data via the first common E-DCH resource to transmitting data via a second common E-DCH resource having a second TTI, which is greater than the first TTI, based on signaling received from a network; and 
 transmit data via the second E-DCH resource according to the second TTI. 
   
     
     
         11 . The wireless terminal of  claim 10 , wherein
 the first TTI is 2 ms and the second TTI is 10 ms.   
     
     
         12 . The wireless terminal of  claim 10 , wherein
 the circuitry is configured to receive the information identifying the first common E-DCH and the first TTI as an information element in a System Information Block (SIB).   
     
     
         13 . The wireless terminal of  claim 12 , wherein
 the circuitry is configured to switch from transmitting data via the first common E-DCH to transmitting data via the second common E-DCH while the information element remains unmodified.   
     
     
         14 . The wireless terminal of  claim 10 , wherein
 the circuitry is configured to transmit information indicating a radio condition of the mobile terminal.   
     
     
         15 . The wireless terminal of  claim 10 , wherein
 the signaling received from the network is based on a radio condition of the mobile terminal.   
     
     
         16 . The wireless terminal of  claim 10 , wherein
 the signaling received from the network is based on detecting and evaluating a change in a radio condition of the mobile terminal.   
     
     
         17 . The wireless terminal of  claim 10 , wherein
 the circuitry is configured to transmit a request for allocation of a specific one of the first or second common E-DCH resource.   
     
     
         18 . A base station comprising:
 circuitry configured to
 transmit, to a mobile station, information indicating Absolute Grant Channel (AGCH) parameters to be used by the mobile station, the AGCH parameters including for each AGCH a first transmission time interval (TTI) or a second TTI, the second TTI being longer than the first TTI, and information indicating a respective TTI and AGCH to be used for each of a plurality of common Enhanced Dedicated Channel (E-DCH) resources, wherein a first of the plurality of common E-DCH resources has an AGCH with the first TTI, and a second of the plurality of common E-DCH resources has an AGCH with the second TTI; and 
 allocate, to the mobile station, the first of the plurality of common E-DCH resources taking into account the TTI indicated for the first of the plurality of common E-DCH resource. 
   
     
     
         19 . The base station of  claim 18 , wherein
 the first TTI is 2 ms and the second TTI is 10 ms.   
     
     
         20 . The base station of  claim 19 , wherein circuitry is configured to dynamically change the allocation between the 2 ms TTI and the 10 ms TTI for the mobile station by detecting and evaluating a change in a radio condition for the mobile station.