United States Patent
`Hodzic et al.
`
`[19]
`
`I 1111111111111111 11111 1111111111 1111111111 1111111111 lllll 111111111111111111
`US006097707 A
`[11] Patent Number:
`[45] Date of Patent:
`
`6,097,707
`*Aug. 1, 2000
`
`[54] ADAPTIVE DIGITAL WIRELESS
`COMMUNICATIONS NETWORK
`APPARATUS AND PROCESS
`
`5,129,096
`5,212,805
`5,276,686
`
`7/1992 Burns ..................................... 455/33.1
`5/1993 Comroe et al. ........................ 455/33.1
`1/1994 Ito .......................................... 455/33.1
`
`[76]
`
`Inventors: Migdat I. Hodzic, 11633 Bridge Park
`Ct., Cupertino, Calif. 95014; James M.
`Brennan, 1224 Martin Ave., Apt. #5,
`San Jose, Calif. 95126
`
`[ *] Notice:
`
`This patent is subject to a terminal dis(cid:173)
`claimer.
`
`[21] Appl. No.: 08/444,553
`
`[22] Filed:
`
`May 19, 1995
`
`Int. Cl.7 ........................................................ H04J 3/16
`[51]
`[52] U.S. Cl. .......................... 370/321; 370/337; 370/347;
`455/54.1; 455/57.1
`[58] Field of Search .................................. 370/24, 26, 29,
`370/18, 55.3, 68.1, 77, 85.2, 79, 85.3, 84,
`94.1, 94.3, 85.7, 95.1, 85.8, 95.2, 95.3,
`100.1, 103, 104.1, 105, 105.1; 379/58,
`63, 59; 340/825.06, 825.07, 825.08; 455/33.1,
`33.4, 16, 15, 49.1, 51.1, 54.2, 53.1, 54.1,
`57.1; 375/200, 202, 205
`
`[56]
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`Primary Examiner-Benedict V. Safourek
`Assistant Examiner-Ricky Q. Ngo
`Attorney, Agent, or Firm-Donald J. Lisa
`
`[57]
`
`ABSTRACT
`
`A single channel wireless digital communication network
`[10] has a cellular topology which includes a central unit
`[12] ("CW") controlling communications with a plurality of
`remote units [14] ("TU") in a star configuration. Network
`access is synchronously controlled through a time division
`multiplexed cycle [20] of variable total duration having an
`up-link phase [21] of a variable number of fixed size time
`slots [25, 27, 27 a], each pre-assigned by reservation by a
`remote unit, and a down-link phase [22] of a variable
`number of variable size slots [31a, 31b] which are adap(cid:173)
`tively utilized. The CU adaptively manages all slot assign(cid:173)
`ments according to a variety of parameters. RU up-link slot
`reservations are confirmed by the CU in a variety of ways.
`During the up-link phase, RU's which did not reserve a slot
`on the previous up-link cycle are temporarily suspended and
`are then polled or periodically tested for re-entry. A repeater
`unit [15] ("RU") having a back-to-back coupled ccu-tu pair
`operates as a minicell within the major cell where major cell
`coverage is not broad enough to reach all major cell TU's.
`
`4,644,534
`
`2/1987 Sperlich ................................. 370/95.3
`
`50 Claims, 3 Drawing Sheets
`
`Ex.1028
`APPLE INC. / Page 1 of 1
`
`