Abstract: A method and apparatus for implementing a security procedure during handover of a wireless transmit/receive unit (WTRU) in wireless communications that controls the behavior of a handover target if it cannot support the required security algorithms. The handover source can detect that the target does not support the required security algorithms and the WTRU can detect that security algorithms may change during handover. Security procedures for the WTRU include contingencies for Radio Link Failure and if the public land mobile network (PLMN) changes.

Abstract: A wireless transmit/receive unit (WTRU) prioritizes triggered events for the same measurement object to lessen the quantity of events which are included in measurement reports, while conveying no less information. The WTRU triggers an event, starts a time-to-trigger timer for the event, and includes the event in a measurement report. Additionally, where a WTRU measures on multiple frequencies, the event triggering is prioritized according to priorities associated with the frequencies.

Abstract: A method and a wireless transmit/receive unit (WTRU), including a universal subscriber identity module (USIM), for identifying, detecting and accessing a closed subscriber group (CSG) cell are disclosed. The WTRU receives a broadcast from a cell including a cell identifier (ID). If the cell ID is associated with a CSG cell, the WTRU determines whether the CSG ID is programmed in the USIM. The cell broadcast may include a single bit information element (IE) indicating that the cell is a CSG cell. The cell broadcast may further include a bit indicating whether the CSG cell is public or private. Different detection and access methods are also provided for detecting public and private CSG cells. Mobility detection methods for the WTRU in the CSG cell are also provided.

Abstract: A method and system for call setup in an evolved third generation (3G) radio access network are disclosed. A wireless transmit/receive unit (WTRU) sends its identity to a core network (CN) for call setup when the WTRU is in an RRC_disconnected state. The CN verifies the identity and sends an authentication vector to the WTRU. The WTRU sends a service access request message including an authentication response to the CN via a Node-B. The Node-B performs an admission control. The CN attaches the WTRU if the authentication response is same to an expected response. The Node-B then allocates radio resources to the WTRU. The Node-Bs may be directly connected, or may be connected to a control plane server which performs admission control. When the WTRU is transitioning from an RRC_idle state to an RRC_connected state, the WTRU may or may not need to re-authenticate again.

Abstract: A method and apparatus are used to perform a Circuit Switched (CS) fallback in wireless communications. The Non-Access Stratum (NAS) of the apparatus determines whether to perform a CS fallback based on an Internet Protocol (IP) Multimedia Subsystem (IMS) registration status, and sends a service request indicating a request to perform the CS fallback when the WTRU is attached to a CS domain. The apparatus also includes an Access Stratum (AS) that receives the CS service request from the NAS, sends an indication of the CS service request in a Radio Resource Control (RRC) message to an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN), wherein the RRC message includes CS service information, and receives a handover command in response to the CS service request.

Abstract: A method for applying a priority of a closed subscriber group (CSG) cell, including receiving priority information for each of a plurality of communication frequencies over which the CSG cell can communicate; storing the priority information at a wireless transmit/receive unit; and applying the priority information to at least one of: taking measurements on a communication frequency, selecting to a CSG cell in the communication frequency, or reselecting to a CSG cell in the communication frequency.

Abstract: A method and apparatus for searching for closed subscriber group (CSG) cells are described. A wireless transmit/receive unit (WTRU) transmits, to a network of CSG cells, a measurement/cell-search gap request message including a cause value having at least one bit that indicates whether the request message was transmitted due to a manual cell search command or a WTRU autonomous determination. The WTRU receives a measurement/cell-search gap allocation message from the network in response to the measurement/cell-search request message. The WTRU also may determine whether it has a discontinuous reception (DRX) gap that is long enough to read a master information block (MIB) and a system information block (SIB) of a neighboring CSG cell. If the DRX gap is not long enough, the WTRU may transmit a measurement/cell-search gap request message to the network, or autonomously tune away from a cell currently serving the WTRU to read the MIB and SIB.

Abstract: A method and apparatus for a wireless transmit receive unit (WTRU) to receive an emergency situation notification. The method and apparatus include the WTRU receiving a paging message with an emergency situation notification, and the WTRU receiving scheduling information in a system information block.

Abstract: A method for performing a manual cell search by a wireless transmit/receive unit (WTRU) includes receiving a manual cell search command and searching for home enhanced Node B (HeNB) cells during a time period. The time period may be a measurement gap or a discontinuous reception period. If an existing measurement gap is available for the WTRU to use, the search can be performed during that gap. Otherwise, the WTRU can request a new measurement gap to search for HeNBs.

Abstract: A method and apparatus of performing packet data convergence protocol (PDCP) re-establishment includes determining a PDCP re-establishment trigger. An error event is detected based upon the PDCP re-establishment trigger, and PDCP re-establishment procedures are requested.

Abstract: A method and apparatus are disclosed wherein a reset procedure for a RLC is implemented by RRC signaling. Triggers for the initiation and execution of the disclosed reset method are also disclosed.

Abstract: A method and apparatus for selecting or reselecting a home Node-B (HNB), (i.e., a closed subscriber group (CSG) cell), among cells having colliding physical layer signals are disclosed. Once the identity (ID) of an HNB is determined, measurements needed to support cell selection or reselection are performed. A broadcast channel that broadcasts an HNB ID is detected and synchronized to, and information obtained from the broadcast channel is forwarded to a non-access stratum (NAS). The broadcasted HNB ID is checked against an HNB white-list provided by the NAS to determine whether the HNB is suitable for a wireless transmit/receive unit (WTRU). The WTRU selects the HNB to camp on, or changes from a cell currently serving the WTRU to the HNB if it is determined to be more suitable than the current serving cell.

Abstract: A method and apparatus for performing non-serving cell measurements and determining cycles for monitoring system information updates. A wireless transmit receive unit (WTRU) is configured to determine it is in measurement mode, compare a serving cell signal to a threshold to obtain serving cell strength and measure a non-serving cell based on the serving cell strength. The WTRU is further configured to determine a channel monitoring cycle. The WTRU is further configured to determine a time to trigger value.

Abstract: Methods and apparatus support configuration and/or control of the radio link control (RLC) and packet data convergence protocol (PDCP) sub-layers by defining and utilizing radio resource control (RRC) parameters and procedures, and by including information elements (IEs) in RRC messages in both the uplink and downlink for RLC and PDCP configuration.

Abstract: A method and apparatus for adaptive handover includes receiving a time to trigger (TTT) for a first mobility state. A scaling factor is received for a second mobility state. The TTT for the second mobility state is determined by scaling the first mobility state with the scaling factor for the second mobility state.

Abstract: A method and apparatus performs processing of the non-access stratus (NAS) layer (layer 3) in long term evolution (LTE) wireless transmit/receive units (WTRUs), which allows the NAS protocol layer to route layer 3 messages to the correct NAS entity, and to encode new NAS message types and information elements. A new architecture is presented that enables NAS security. When a NAS message is generated, a determination is made as to whether or not to cipher, de-cipher and/or integrity check the NAS message based on at least one of a protocol discriminator (PD) of the NAS message, an indicator field in a header of the NAS message, the type of the NAS message, a NAS security state variable, and an indication by an upper layer protocol. The NAS security state variable indicates whether NAS security is currently active or not and may comprise one bit.

Abstract: A method for performing cell reselection first determines a current cell selection quality value. The cell selection quality value is compared to a predetermined threshold. Measurements of neighboring cells are taken if the cell selection quality value is less than or equal to the predetermined threshold. Measurements can be taken of intra-frequency cells, inter-frequency cells, and inter-radio access technology cells. If a neighboring cell is found that is better than the current cell based on the measurements, then the better neighbor cell is reselected to.

Abstract: A method and apparatus for handling mobility between a non-third generation partnership project (3GPP) radio access technology (RAT) and a 3GPP RAT includes utilizing services provided by the non-3GPP RAT. A need to utilize services provided by the 3GPP RAT is determined and a 3GPP non-access stratum (NAS) state is entered. 3GPP messages are tunneled to the 3GPP EPC network over the non-3GPP access RAT and a transition is made from the non-3GPP RAT to the 3GPP RAT. A 3GPP NAS state transition is made and a transition to a second 3GPP NAS state occurs.

Abstract: A wireless transmit receive unit (WTRU) is configured to receive unciphered and ciphered messages. The unciphered messages include identity requests, authentication requests, non-access stratum (NAS) security mode commands and tracking area update responses. The ciphered messages may come from the NAS and a Radio Resource Controller (RRC). The messages are ciphered using security keys.

Abstract: A method and apparatus for implementing Idle and Connected Mode mobility to and from a Home evolved Node-B (HNB) in a wireless environment. Methods to implement differentiated charging when accessing HNBs, as well as the criteria used to make a cell reselection decision when an HNB is detected, criteria for making a handoff decision and methods to indicate charging and other policies/preferences and configurations to a wireless transmit/receive unit (WTRU).