Pre-Grant Publication Number: 20110103251
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Prior Art Detail
Summary / Description
| Summary / Description | We propose multicast/broadcast numerology and frame structure as well as MBS feedback. |
Basic Information
| Type of Prior Art | Print Publication |
| Publication Title * | IEEE C802.16m-08/089, IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16& |
| Author | Wookbong Lee, Dongcheol Kim, Jaho Koo |
| ISBN | |
| Page Range | 2-6 |
| Medium | Other printed publication |
| Publication Date * | January 16, 2008 |
| URL | http://www.ieee802.org/16/tgm/c... |
Notes / To Do
| Notes | |
Excerpt
Excerpt Generally, the single frequency network (SFN) configuration is one of the major features in achieving the high spectral efficiency and coverage of multicast/broadcast service systems. When working in MBSFN, all BSs are transmitting same signal using same modulation and coding rate, permutation, and subchannelization at the same resources. In this case, an equivalent channel delay profile is the sum of the individual channels from all BSs in the MBS zone to a MS. The delay in the signals that come from a distant BS translates to a delayed impulse response, which increase the delay spread of the equivalent channel and generate ISI when the signal is exceeding cyclic prefix (CP). Therefore MBS CP duration should be longer than that of unicast, and long enough to obtain the macro-diversity gain (SFN gain). However, longer CP will reduce number of data resources, so we have to consider these two factors simultaneously... Table 2 and Fig. 2 show MBS performance according to different CP length. For examining exact effect of different CP length, we use about 1 dB granularity MCS level rather than use reference system’s MCS set. MCS set used in the simulation can be found in appendix. As you can see in the results, very short CP length is enough (CP ratio of 1/16) for very small cell radius. However, for medium to large cell size, medium size CP length (CP ratio of 1/8) is better comparing with small CP size and very large CP size. |
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