Backward compatibility handling when adding new integrity protection and ciphering algorithms
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsAntonino Orsino, Mattias Bergström
Life of this patent
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Abstract
A method performed by a communication device configured with a packet data convergence protocol, PDCP, security algorithm associated with a first radio access technology, RAT, includes responsive to the communication device being configured with a first PDCP security algorithm in the first RAT that does not have an equivalent security algorithm in a second RAT, determining a second security algorithm to use when performing radio resource control, RRC, reestablishment with the second RAT. The method includes using the second security algorithm when performing RRC reestablishment with the second RAT.
Claims10
A method performed by a communication device configured with a packet data convergence protocol (PDCP) security algorithm associated with a first radio access technology (RAT), the method comprising:
- responsive to the communication device being configured with a first PDCP security algorithm in the first RAT that does not have an equivalent security algorithm in a second RAT, determining a second security algorithm to use when performing radio resource control (RRC) reestablishment with the second RAT, wherein determining the second security algorithm to use comprises at least one of:
- determining the second security algorithm based on an indication from a RAT node towards which the communication device reestablishes a connection to the second RAT, wherein determining the second security algorithm based on the indication comprises obtaining the indication from system information;
- deciding the second security algorithm to use by the communication device and notifying the choice to a network;
- transmitting a message to the second RAT to ask which security algorithm should be used as the second security algorithm, and receiving a response message from the second RAT with an indication of the second security algorithm to use;
- autonomously releasing an RRC connection and transiting to RRC_IDLE, and triggering random access towards a same cell in order to initiate a new connection by sending an RRC setup request with an indication that the initiation of the new connection is due to a conflict in what security algorithm to choose upon RRC reestablishment;
- and/or
- triggering a new re-selection procedure for selecting a new cell, and performing a random access towards the new cell with an indication that the communication device has a conflict in selecting a second security algorithm that does not have an equivalent in NR;
- and
- using the second security algorithm when performing RRC reestablishment with the second RAT.
A communication device, configured with a packet data convergence protocol (PDCP) security algorithm associated with a first radio access technology (RAT), the communication device adapted to:
- responsive to the communication device being configured with a first PDCP security algorithm in the first RAT that does not have an equivalent security algorithm in a second RAT, determine a second security algorithm to use when performing radio resource control (RRC) reestablishment with the second RAT, wherein determining the second security algorithm to use comprises at least one of:
- determining the second security algorithm based on an indication from a RAT node towards which the communication device reestablishes a connection to the second RAT, wherein determining the second security algorithm based on the indication comprises obtaining the indication from system information;
- deciding the second security algorithm to use by the communication device and notifying the choice to a network;
- transmitting a message to the second RAT to ask which security algorithm should be used as the second security algorithm, and receiving a response message from the second RAT with an indication of the second security algorithm to use;
- autonomously releasing an RRC connection and transiting to RRC_IDLE, and triggering random access towards a same cell in order to initiate a new connection by sending an RRC setup request with an indication that the initiation of the new connection is due to a conflict in what security algorithm to choose upon RRC reestablishment;
- and/or
- triggering a new re-selection procedure for selecting a new cell, and performing a random access towards the new cell with an indication that the communication device has a conflict in selecting a second security algorithm that does not have an equivalent in NR;
- and
- use the second security algorithm when performing RRC reestablishment with the second RAT.
Dependencies are inferred from the claim text.