Patent ID: 9225570
Filing Date: 2015-12-29
Classification: H04L,H04Q

Abstract:
1. A method of allocating an upstream bandwidth resource of an optical line terminal in an orthogonal frequency division multiple access-open optical subscriber network, the method comprising: receiving queue status information from each optical network unit (ONU); and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU; wherein, in the allocating of the upstream bandwidth, first delay-sensitive services of an ONU are first allocated space in the 2-D upstream bandwidth map, and a remaining space of the 2-D upstream bandwidth map is designated as a negative offset, second delay-sensitive services of the ONU are next allocated space corresponding to the negative offset in the 2-D upstream bandwidth map, and delay-insensitive services of the ONU are last allocated space corresponding to the negative offset in the 2-D upstream bandwidth map, and if a number of subcarriers corresponding to space in the 2-D upstream bandwidth map is insufficient for the delay-insensitive services, unallocated space in the 2-D upstream bandwidth map is designated as a positive offset and accumulated for the delay-insensitive services over multiple frames.