(54) DIRECT COMMUNICATION METHOD BETWEEN SLAVE UNITS AND PHS TERMINAL FOR DIRECT COMMUNICATION BETWEEN PHS SLAVE UNITS
(75) Inventor: Makibi Kato, Tokyo (JP)
(73) Assignee: Oki Electric Industry Co., Ltd., Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/312,853
(22) Filed: May 17, 1999
(30) Foreign Application Priority Data
May 26, 1998 (JP) 10-143649
(51) Int. CI.7 H04Q 7/20; H04Q 7/32
(52) U.S. CI 370/347; 370/337; 370/350;
370/442; 370/349; 455/517; 455/550; 455/557
(58) Field of Search 370/337, 347,
370/350, 442, 503, 349; 455/509, 517, 502, 426, 550, 556, 557, 526, 422, 424,
425, 403
(56) References Cited
U.S. PATENT DOCUMENTS
5,212,809 A * 5/1993 Oka 455/557
5,515,366 A * 5/1996 Chieu et al 370/337
5,907,794 A * 5/1999 Lehmusto et al 455/509
5,995,500 A * 11/1999 Ma et al 370/337
6,289,218 Bl * 9/2001 Liu 370/337
* cited by examiner
Primary Examiner—-William Trost
Assistant Examiner—Keith Ferguson
(74) Attorney, Agent, or Firm—-Venable; Robert J. Frank
(57) ABSTRACT
A PHS terminal has a PHS slave unit and data processing equipment connected to the PHS slave unit for data communication. The PHS terminal includes a continuous slot forming circuit for continuously forming, at least at the time of direct communication between the PHS slave unit and the other PHS slave unit, a desired number of consecutive slots in a TDMA frame. An identification message forming circuit forms, when the PHS terminal calls the other PHS terminal including the other PHS slave unit, a message for informing the other PHS terminal of whether the PHS terminal to which the circuit belongs is a server or a client. A callback control circuit automatically redials if the message shows that the other PHS terminal originated a call is a client. A reserve message forming circuit forms, based on the quantity of data to send, a reserve message representative of the number of slots to reserve in one frame. A number-of-slot setting circuit compares, on receiving the reserve message, the number of reserve slots represented by the reserve message and the number of reserve slots of the PHS terminal to which the circuit belongs, and sets, based on the result of comparison, the number of slots to be sent from the PHS terminal for a frame in the continuous slot forming circuit.
19 Claims, 7 Drawing Sheets
