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US 9,807,663 B2Granted
Inter-system cell reselection in TD-SCDMA systems
AssigneeQUALCOMM Incorporated
InventorsKrishna Rao Mandadapu, Thawatt Gopal
Life of this patent
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Abstract
When a user equipment performs inter-cell measurement, it may desire to measure signal quality and signal level of a source radio access technology (RAT) cell and a target cell. The signal quality measurement may be Squal and the signal level measurement may be Srxlev. Because Squal is not defined for TD-SCDMA, a new measurement criteria is defined to allow proper comparison of source RAT cell measurements with target RAT cell measurements when a user equipment is considering switching to a target cell.
Claims15
A method for wireless communication at a user equipment (UE), comprising:
- measuring a signal strength of a common channel of a source radio access technology (RAT) cell for cell reselection from the source RAT cell to a target RAT cell when the UE is in an idle mode, a cell paging channel state, or a UTRAN Registration Area (URA) paging channel state, in which the source RAT cell is a serving cell and a time division-synchronous code division multiple access (TD-SCDMA) cell, in which a reselection criteria of the target RAT cell includes signal strength evaluation and signal quality evaluation and in which a reselection criteria of the source RAT cell includes the signal strength evaluation and not the signal quality evaluation, the source RAT cell having a source priority;
- measuring a received signal quality metric of a common pilot signal of the target RAT cell in accordance with the reselection criteria of the target RAT cell, the target RAT cell having a target priority;
- and
- performing an adjusted cell reselection evaluation procedure based at least in part on the signal strength of the common channel of the source RAT cell and the received signal quality metric of the common pilot signal of the target RAT cell when the target priority is lower than the source priority by comparing the signal strength of the common channel of the source RAT cell to a first threshold and the received signal quality metric of the common pilot signal of the target RAT cell to a second threshold.
1 more element
A user equipment (UE) for wireless communication, comprising:
- means for measuring a signal strength of a common channel of a source radio access technology (RAT) cell for cell reselection from the source RAT cell to a target RAT cell when the UE is in an idle mode, a cell paging channel state, or a UTRAN Registration Area (URA) paging channel state, in which the source RAT cell is a serving cell and a time division-synchronous code division multiple access (TD-SCDMA) cell, in which a reselection criteria of the target RAT cell includes signal strength evaluation and signal quality evaluation and in which a reselection criteria of the source RAT cell includes the signal strength evaluation and not the signal quality evaluation, the source RAT cell having a source priority;
- means for measuring a received signal quality metric of a common pilot signal of the target RAT cell in accordance with the reselection criteria of the target RAT cell, the target RAT cell having a target priority;
- and
- means for performing an adjusted cell reselection evaluation procedure based at least in part on the signal strength of the common channel of the source RAT cell and the received signal quality metric of the common pilot signal of the target RAT cell when the target priority is lower than the source priority by comparing the signal strength of the common channel of the source RAT cell to a first threshold and the received signal quality metric of the common pilot signal of the target RAT cell to a second threshold.
1 more element
A non-transitory computer-readable medium having program code which, when executed by at least one processor at a user equipment (UE), causes the at least one processor:
- to measure a signal strength of a common channel of a source radio access technology (RAT) cell for cell reselection from the source RAT cell to a target RAT cell when the UE is in an idle mode, a cell paging channel state, or a UTRAN Registration Area (URA) paging channel state, in which the source RAT cell is a serving cell and a time division-synchronous code division multiple access (TD-SCDMA) cell, in which a reselection criteria of the target RAT cell includes signal strength evaluation and signal quality evaluation and in which a reselection criteria of the source RAT cell includes the signal strength evaluation and not the signal quality evaluation, the source RAT cell having a source priority;
- to measure a received signal quality metric of a common pilot signal of the target RAT cell in accordance with the reselection criteria of the target RAT cell, the target RAT cell having a target priority;
- and
- to perform an adjusted cell reselection evaluation procedure based at least in part on the signal strength of the common channel of the source RAT cell and the received signal quality metric of the common pilot signal of the target RAT cell when the target priority is lower than the source priority by comparing the signal strength of the common channel of the source RAT cell to a first threshold and the received signal quality metric of the common pilot signal of the target RAT cell to a second threshold.
1 more element
A user equipment (UE) for wireless communication, comprising:
- a memory;
- and
- at least one processor coupled to the memory, the at least one processor being configured:
- to measure a signal strength of a common channel of a source radio access technology (RAT) cell for cell reselection from the source RAT cell to a target RAT cell when the UE is in an idle mode, a cell paging channel state, or a UTRAN Registration Area (URA) paging channel state, in which the source RAT cell is a serving cell and a time division-synchronous code division multiple access (TD-SCDMA) cell, in which a reselection criteria of the target RAT cell includes signal strength evaluation and signal quality evaluation and in which a reselection criteria of the source RAT cell includes the signal strength evaluation and not the signal quality evaluation, the source RAT cell having a source priority;
- to measure a received signal quality metric of a common pilot signal of the target RAT cell in accordance with the reselection criteria of the target RAT cell, the target RAT cell having a target priority;
- and
- to perform an adjusted cell reselection evaluation procedure based at least in part on the signal strength of the common channel of the source RAT cell and the received signal quality metric of the common pilot signal of the target RAT cell when the target priority is lower than the source priority by comparing the signal strength of the common channel of the source RAT cell to a first threshold and the received signal quality metric of the common pilot signal of the target RAT cell to a second threshold.
4 more elements
Dependencies are inferred from the claim text.