Abstract:
Aspects of the methods and apparatus relate to performing call recovery after a call drop. A cell selection update procedure may be initiated to recover a call in response to the call being dropped with a serving cell. Link conditions may be determined for the serving cell and for different candidate cells. The aspects of the methods and apparatus also include selecting a cell, based on the link conditions, from among the serving cell and a candidate cell with a highest signal power parameter in a Primary Common Control Physical Channel (PCCPCH) across a set of neighboring frequencies of the different candidate cells. Call recovery may be performed using the selected cell. In some aspects, the highest signal power parameter may be a highest Received Signal Code Power (RSCP).
Abstract:
A user equipment (UE) performs hard handover rather than baton handover when a handover command includes a scheduling request configuration and includes no random access configuration. When the UE receives a handover command including a scheduling request configuration, and no random access configuration, the UE determines the random access configuration for the hard handover based on the scheduling request configuration.
Abstract:
A method of wireless communication manages the positioning of uplink pilot channel transmissions. A random access request is transmitted at a first location indicated in a circuit switched fall back (CSFB) redirection message. The random access request is then retransmitted at a second location when a response is not received for the random access request transmitted at the first location.
Abstract:
An apparatus and method adaptively vary how often to adjust uplink timing in a wireless network. The frequency for adjusting uplink timing is varied based on a measured path loss and/or downlink timing variation.
Abstract:
A base station may allocate served user equipments (UEs) into measurement gap groups, which are configured to reduce the overlap between UE measurement gaps used for inter-RAT measurement. The base station may configure the measurement gap groups based on an offset between subframes of a served and measured RAT and may distribute UEs in the measurement gap groups to avoid overlapping inter-RAT measurement times, thereby reducing idle base station resources.
Abstract:
A user equipment (UE) combines baton and hard handover procedures to reduce handover latency, and improve throughput. In one instance, the UE receives a handover command and in response, substantially simultaneously initiates both a hard handover procedure and a baton handover procedure. When a hard handover response is received before a baton handover response, the UE continues with the hard handover procedure and then aborts the baton handover procedure. When the baton handover response is received before a hard handover response, the UE continues with the baton handover procedure and then aborts the hard handover procedure.
Abstract:
In baton handover in TD-SCDMA communications, a user equipment (UE) may make use of multiple receivers in a receive diversity configuration to reduce call drops during baton handover. Following uplink handover, the UE may tune a first receiver to a target cell while maintaining a second receiver tuned to the source cell. If the UE measures a signal quality of the target cell greater than a signal quality of the source cell the UE tunes the second receiver to the target cell and complete the handover. If the UE measures a signal quality of the source cell greater than a signal quality of the target cell, the UE may switch the first receiver and UL back to the source cell and terminate the handover. Thus the UE may avoid handover to a target cell with poor signal quality.
Abstract:
A user equipment (UE) avoids or reduces delay associated with measuring preferred neighbor cells by scheduling inter frequency measurements based on network indicated offset values provided by a network. In some instances, the UE performs measurements when the UE wakes up from a sleep mode. The UE schedules measurement of a neighbor cell with a lower offset value more frequently or earlier. The offset value can be a Qoffset value.
Abstract:
Methods and apparatus for wireless communication at a user equipment (UE) include sending a downlink enhancement message to a network entity when a downlink enhancement condition has been detected. Further, the methods and apparatus include receiving communication from the network entity in response to sending the downlink enhancement message. Moreover, methods and apparatus for wireless communication at a network entity include detecting a downlink enhancement condition. Additionally, the methods and apparatus include transmitting a network entity originated downlink enhancement message to a UE in response to detecting the downlink enhancement condition.
Abstract:
A user equipment (UE) may achieve fast inter radio access technology (IRAT) measurement and better IRAT handover performance to effectively avoid call drops via smooth IRAT handover to other RATs during Time Division High Speed Downlink/Uplink Packet Access (TD-HSDPA/TD-HSUPA) data transmission. In some instances, the UE may speed up the IRAT measurement by request a resource allocation grant preference from a base station. The request indicates a reduced number of time resources and an increased number of other resources.