Connection attempt to alternative access upon connection attempt rejection

Abstract

The invention relates to methods, user equipments, computer programs, computer program products and carriers for access network selection between a first network and a second network. Said first and second networks comprise one or more access candidates. An access network selection procedure is performed for one or more access candidates of the second network, sequentially performing for the access candidates of the second network connection establishing attempts to one or more access candidates, by selecting a new access candidate from said one or more access candidates, and performing connection establishing attempts to said access candidate until a connection to the access candidate is established or a stop criterion for said access candidate is fulfilled.

1 - 18 . (canceled) 
     
     
         19 . A user equipment, UE, comprising:
 processor circuitry, and   memory containing computer program code which, when run in the processor circuitry, causes the UE to perform a method for access network selection between a first network and a second network, each of said first and second networks comprising one or more access candidates, the method comprising:
 starting an access network selection procedure for one or more access candidates of the second network; and 
 sequentially performing, for the one or more access candidates of the second network, connection establishing attempts to the one or more access candidates by:
 selecting a new access candidate from said one or more access candidates; and 
 performing connection establishing attempts to said access candidate until a connection to the access candidate is established or a stop criterion for said access candidate is fulfilled. 
 
   
     
     
         20 . The user equipment according to  claim 19 , wherein the method performed by the user equipment further comprises:
 terminating the access network selection procedure if connection to one of said one or more access candidates is established or each connection establishing attempt for all of the one or more access candidates of the second network has been stopped by a stop criterion.   
     
     
         21 . The user equipment according to  claim 19 , wherein the stop criterion is based on a maximum time for a connection establishing attempt. 
     
     
         22 . The user equipment according to  claim 19 , wherein the stop criterion is based on a maximum number of connection establishing attempts for establishing connection to an access candidate. 
     
     
         23 . The user equipment according to  claim 19 , wherein the stop criterion is that a rejection is received from the access candidate to which a connection establishing attempt is performed. 
     
     
         24 . The user equipment according to  claim 19 , wherein the selecting is based on a cause value indicating an alternative access candidate for the user equipment to select. 
     
     
         25 . The user equipment according to  claim 24 , wherein the cause value indicates selecting an alternative access candidate implementing a Radio Access Technology which differs from the Radio Access Technology used in the first network. 
     
     
         26 . The user equipment according to  claim 24 , wherein an absence of a default value or the cause value is indicating for the user equipment to perform a default behaviour. 
     
     
         27 . The user equipment according to  claim 19 , wherein the user equipment selects one alternative access candidate based on a priority order. 
     
     
         28 . The user equipment according to  claim 27 , wherein the UE is adapted to evaluate which of the access candidates available that has the highest priority. 
     
     
         29 . The user equipment according to  claim 27 , wherein the user equipment is adapted to maintain a priority list with a list of available access candidates. 
     
     
         30 . The user equipment according to  29 , wherein the user equipment is adapted to update said list of available access candidates. 
     
     
         31 . The user equipment according to  claim 29 , wherein the user equipment is adapted to update said list of available access candidates when the user equipment gets rejected or disconnected with a specific cause value. 
     
     
         32 . The user equipment according to  claim 19 , wherein the second network implements a different Radio Access Technology than the Radio Access Technology of the first network. 
     
     
         33 . (canceled)