Title:
共用メディア通信ネットワークのためのタイムスロットスケジューリング
Document Type and Number:
Japanese Patent JP3981015
Kind Code:
B2
Abstract:
A method and apparatus for allocating time slots in a communications network, comprising a headend, a plurality of outstations, and a shared medium connecting each outstation to the headend. The method involves scheduling timeslots for each outstation responsive to the measures of distance of each outstation from the headend. The method reduces the requirement for guard bands between timeslots, since it obviates allocation of a guard band between consecutive first and second timeslots where the outstation allocated the second timeslot is located no closer to the headend than the outstation allocated the first time slot. Ideally, the timeslots are allocated to outstations cyclically in ascending order of distance of the outstations from the headend, with the closest outstation following the farthest to complete the cycle, so that guard bands are rendered unnecessary between the majority of timeslots. In preferred embodiments distance may be round-trip delay, and the outstations and head end may be configured to form a ring network.
Inventors:
Unit, brian
Grant, Michael
Grant, Michael
Application Number:
JP2002580537A
Publication Date:
September 26, 2007
Filing Date:
April 02, 2002
Export Citation:
Assignee:
NORTEL NETWORKS LIMITED
International Classes:
H04L12/43; H04L12/44; H04B10/27; H04B10/272; H04B10/275; H04B10/556; H04J3/06; H04J3/16; H04J14/08; H04L12/28; H04L12/42
Domestic Patent References:
| JP4181837A | ||||
| JP64039850A | ||||
| JP58073253A | ||||
| JP3108838A | ||||
| JP11215171A |
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito