Portable internet analyzer having handover test function
View Patent ↗Disclosed herein is a portable Internet analyzer (PIA) having a handover test function. The portable Internet analyzer includes a transmission unit, a reception unit, a switching unit, and a central control unit. The transmission unit encodes the various DownLink signals of a serving and/or target Base Station (stBS) using a preamble index, synthesizes the encoded signals, and sends the synthesized signals to a Portable Subscriber Station (PSS). The reception unit receives various UpLink (UL) signals from the PSS, and decodes the UL signals using the cell Parameters of the stBS. The switching unit selectively switches the transmission unit and the reception unit to the PSS. The central control unit generates various Media Access Control (MAC) messages to be sent to the PSS through the transmission unit in association with the handover test, analyzes handover test-related MAC messages received through the reception unit, and controls switching operation of the switching unit.
1. A portable Internet analyzer having a handover test function, comprising:
a transmission unit for encoding various DownLink (DL) signals of a serving Base Station (BS) or/and a target BS using a preamble index, including a cell Identification (ID) assigned in advance in a form of a unique code in association with a handover test, synthesizing the encoded signals, and sending the synthesized signals to a Portable Subscriber Station (PSS);
a reception unit for receiving various UpLink (UL) signals from the PSS in association with the handover test, and decoding the UL signals using the cell Parameters of the serving BS or/and target BS;
a switching unit for selectively switching the transmission unit and the reception unit to the PSS for each of DL and UL sections of each frame; and
a central control unit for generating various Media Access Control (MAC) messages to be sent to the PSS through the transmission unit in association with the handover test, analyzing handover test-related MAC messages received through the reception unit, and controlling switching operation of the switching unit,
wherein the transmission unit comprises a serving BS signal generation unit and target BS signal generation unit for implementing a physical layer algorithm, which includes encoding using the preamble indices and is performed in the serving BS and the target BS in association with the handover test, power/frequency adjustment units for separately adjusting power and frequency of the various DL signals output from the serving BS signal generation unit and the target BS signal generation unit, a mixer for mixing the DL signals output from respective power/frequency adjustment units, and a transmission control unit for implementing an algorithm of a MAC layer, which is a relatively upper layer, generating a MAC Protocol Data Unit (MAC PDU), generating an Uplink Channel Descriptor (UCD)/Downlink Channel Descriptor (DCD), including a UL cell ID, and other required messages, transferring the messages to the serving BS signal generation unit and the target BS signal generation unit, and controlling respective power/frequency adjustment units.
2. The portable Internet analyzer as set forth in claim 1 , wherein the transmission unit is further provided with a function of separately controlling Carrier to Interference Noise Ratios (CINRs) of various DL signals output from the serving BS signal generation unit and the target BS signal generation unit.
3. The portable Internet analyzer as set forth in claim 1 , wherein the transmission unit is further provided with a function of separately controlling timing offsets between various DL signals output from the serving BS signal generation unit and the target BS signal generation unit.
4. The portable Internet analyzer as set forth in claim 1 , wherein the serving BS signal generation unit and the target BS signal generation unit are implemented using Field Programmable Gate Arrays (FPGAs) or Digital Signal Processors (DSPs).
5. The portable Internet analyzer as set forth in claim 4 , wherein the transmission control unit is implemented using a DSP.
6. The portable Internet analyzer as set forth in claim 5 , wherein the reception unit comprises a serving BS signal analysis unit and target BS signal analysis unit for receiving various types of UL signals from the PSS and decoding the received UL signals using cell Parameters assigned to the serving BS signal generation unit and the target BS signal generation unit, and a reception control unit for controlling operation of the serving BS signal analysis unit and the target BS signal analysis unit and transferring the signals, decoded by the serving BS signal analysis unit and the target BS signal analysis unit, to the central control unit.
7. The portable Internet analyzer as set forth in claim 6 , wherein the central control unit is implemented using a typical personal computer, maintains synchronization between the transmission unit and the reception unit while bidirectionally communicating with the transmission control unit of the transmission unit and the reception control unit of the reception unit, performs a backbone function for the serving BS signal generation unit, the target BS signal generation unit, the serving BS signal analysis unit and the target BS signal analysis unit, generates messages to be sent through the transmission unit, generates UL-MAP information, transfers the UL-MAP information to the transmission unit and the reception unit, provides a user interface, which is configured to receive various handover test-related items set or input by a user, to the user, analyzes results of the decoding, received from the reception unit, and various types of data, received from the PSS, and notifies the user of results of the analysis.