[특허]Method and apparatus for establishing a communication link

Method and apparatus for establishing a communication link 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-007/02 H04B-007/00 H04B-001/04
출원번호	US-0068274 (1993-05-26)
발명자 / 주소	Buchenhorner Michael J. (Coral Gables FL) Ghomeshi Mohammad M. (Ft. Lauderdale FL) Shapiro Steven C. (Lake Worth FL)
출원인 / 주소	Motorola, Inc. (Schaumburg IL 02)
인용정보	피인용 횟수 : 57 인용 특허 : 0

초록 ▼

A method and apparatus whereby a communication unit (10) transmits a first communication channel request signal at a first power level. If a communication link with a base site (12) is not established within a predetermined period, the communication unit transmits a second communication channel request signal at a second level which is higher than the level of the first communication channel request signal. This process may be continued for a predetermined number of times or until a communication link is established. Thus, the probability that a nearby base site, rather than a more distant base site, grants the communication channel is greatly enhanced.

대표청구항 ▼

In a communication system having a plurality of base sites coupled to a telephone network for independently allocating a communication channel for use by a communication unit in response to a channel request signal transmitted from the communication unit in an attempt to gain allocation of the communication channel to communicate via the telephone network, and wherein a particular base site is an optimum base site in the sense that it is closer to the communication unit transmitting the channel request signal, a method facilitating the allocation of a communication channel from the particular base site comprising the communication unit steps of: (a) transmitting a first channel request signal at a first power level; (b) receiving a first channel grant signal from a first base site of the plurality of base sites having a first signal strength level; (c) measuring and storing a first value representing the first signal strength level; (d) transmitting a second channel request signal at a second power level that is greater than the first power level; (e) receiving a second channel grant signal having a second signal strength level from a second base site of the plurality of base sites; (f) measuring and storing a second value representing the second signal strength level; (g) comparing the first value representing the first signal strength level with the second value representing the second signal strength level to determine which of the channel grant signals has a greater signal strength; and (h) selecting the particular base site based on the stored values representing the signal strength levels of the first and second base sites and on the first and second power levels.

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