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Method and system for controlling a pilot measurement request order (PMRO)
| Details |
Inventors: Jeong, Jin-soo; Kim, Pil-young;
Assignee: Samsung Electronics Co., LTD (KR)
Primary Examiner: Nguyen; Lee
Assistant Examiner: Tran; Congvan
Attorney, Agent or Firm: Dilworth & Barrese, LLP
A method and a system are disclosed for controlling a pilot measurement request order for a soft swap handoff in a code division multiple access system. A preferred embodiment of the present invention comprises the steps of perceiving by a mobile station which is currently in communication with a first base transceiver station (BTS) a pilot signal strength which is above a predetermined threshold value, wherein the pilot signal is from a second BTS which is not currently in communication with the mobile station, reporting pilot signal strengths of the first BTS and of the second BTS through a pilot strength measurement message (PSMM) from the mobile station to a base station controller (BSC) if the mobile station perceives a pilot signal strength which is above a predetermined threshold value, informing the mobile station of reception of PSMM in order to prevent the mobile station from reporting unnecessary PSMM, checking whether the second BTS is corresponding to neighboring BTSs of the first BTS, ordering the mobile station to perform handoff, if the second BTS is corresponding to neighboring BTS, transmitting a pilot measurement request order (PMRO) from the BSC to the mobile station if the second BTS is not corresponding to neighboring BTS and reporting the strengths of all pilot signal receivable from BTSs through a pilot strength measurement message (PSMM) to the BSC after the mobile station waits for a predetermined action time upon reception of the PMRO. |
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DETAILED DESCRIPTION OF THE INVENTION Preferred embodiments of the present invention relate to a system and a method for instructing a mobile station to measure a pilot signal only after a predetermined time delay, in the case where the mobile station made a previous request for a handoff to a base transceiver station (BTS) which is not contained in the mobile station's neighbor list.
A first aspect of the present invention is directed to the establishment of the aforementioned predetermined time delay.
The predetermined time delay value, referred to herein as an "action time", instructs the mobile station on how long to wait before making the pilot signal measurement.
The time delay is included as part of the pilot measurement request order (PMRO) issued by a base station controller (BSC) subsequent to receiving a handoff request from a mobile station to a base station not contained in the mobile station's neighbor list.
If the BSC switches an action time-use-field from "No" to "Yes" and transmits the PMRO to a mobile station, the mobile station will process the corresponding message only after waiting for the predetermined action time.
The predetermined action time is defined as a minimum time required for a mobile station to move away from a non-neighboring BTS to a position where a pilot signal strength from the non-neighboring BTS falls below a predetermined threshold value.
In addition to requiring the mobile station to wait for an action time before transmitting a PSMM message, a second aspect of the present invention is directed to a second predetermined time delay associated with the transmitting pilot measurement request order (PMRO) issued by a base station controller (BSC) to a mobile station.
That is, the method further includes the mobile station receiving the PMRO from the BSC a predetermined delay time after the mobile station sends a pilot strength measurement message (PSMM).
A third embodiment of the present invention is directed to a method for combining the first two embodiments
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