| 摘要 |
In the 3GPP Long Term Evolution wireless communication system, when performing handovers, the client terminal is not required to know the Radio Frame Number of the target cell. While basic functionality of the LTE wireless communication system air interface can be maintained in the new serving cell after handover completion without knowing the Radio Frame Number of the new serving cell, it is not possible to immediately resume many other important functions of LTE wireless communication system air interface, such as CSI measurements and reporting, SRS transmission, and SPS. Such functions can only be resumed after the Radio Frame Number becomes known. Conventional methods acquire the Radio Frame Number after completion of the handover. This may delay the resumption of the CSI, SRS, and SPS functions. A method and apparatus are disclosed that enable the client terminal to resume the CSI, SRS, and SPS functions immediately after handover completion. |
| 主权项 |
1. A method of employing radio signal information in a receiver used in a wireless communication system having multiple cells, the method comprising:
initiating, by one or more processors of the receiver, a cell search procedure detecting new cells and tracking already detected cells from one or more previous cell search procedures; performing, by the one or more processors, Reference Signal Received Power (RSRP) measurements for a serving cell and neighbor cells detected during the cell search procedure; selecting for further processing, by the one or more processors, any of the neighbor cells whose RSRP is within a first predetermined dB difference (Δ1) of the serving cell; determining, by the one or more processors, whether one or more of the selected neighbor cells' Physical Cell Identity (PCI) is the same as any previously visited cell; for the selected neighbor cells whose PCI is the same as any respective previously visited cell, the one or more processors using a previously decoded and tracked Radio Frame Number (RFN) corresponding to the respective previously visited cell; performing, by the one or more processors, Physical Broadcast Channel (PBCH) decoding for any remaining selected neighbor cells whose RFN is not yet known; stopping, by the one or more processors, the PBCH decoding for given ones of the neighbor cells that fall within a second predetermined dB difference (Δ2) below the serving cell RSRP after the given neighbor cells were previously selected for PBCH decoding; storing and tracking, by the one or more processors, the RFN and PCI for any ones of the neighbor cells that satisfy the selection criteria and whose PBCH decoding is successful; and using, by the one or more processors, the RFN and PCI information for the stored and tracked neighbor cells when a handover is completed to a new serving cell, wherein the RFN and PCI information is used to immediately resume, if enabled, one or more of a Channel State Information (CSI) function, an Sounding Reference Signal (SRS) function, and a Semi-Persistent Scheduling (SPS) function in the new serving cell after the handover. |
