DVB-T Mobile Handover

Transcription

1 Understand DVB-T Mobile Handover in 20 Minutes or Your Money Back

2 was personal wireless long before Broadcast wireless was cool

3 Compared to this...

4 ...mobile DVB-T may seem like this...

5 ...but actually it s more like this.

6 The mobility usecases of DVB-T are centered around vehicle based reception

7 DVB-T Mobility does not add any new modulation features

8 The solution is solely based on Sig nalling

9 Munich Next fequency? Service available? If yes: frequency and IDs? If not:??? Salzburg Stuttgart

10 Solution Part 1: Frequencies and Topology

11 Next fequency? NITactual / other network_id transport_stream_id orig_network_id f0 ONID? TSID? ter_deliv_sys_descriptor f1 frequency_list_descriptor f2 f3 fn

12 31 ETSI EN V1.6.1 ( ) TPS transmission format The transmission parameter information shall be transmitted as shown in table 9. The mapping of each of the transmission parameters: constellation characteristics, α value, code rate(s), super-frame indicator and guard interval onto the bit combinations is performed according to clauses to The left most bit is sent first. Table 9: TPS signalling information and format Bit number Format Purpose/Content s 0 see clause Initialization s 1 to s or Synchronization word s 17 to s 22 see clause Length indicator (see annex F) s 23, s 24 see table 10 Frame number s 25, s 26 see table 11 Constellation s 27, s 28, s 29 see table 12 Hierarchy information (see annex F) s 30, s 31, s 32 see table 13 Code rate, HP stream s 33, s 34, s 35 see table 13 Code rate, LP stream s 36, s 37 see table 14 Guard interval s 38, s 39 see table 15 Transmission mode (see annex F) s 40 to s 47 see clause Cell identifier s 48 to s 53 all set to "0" See annex F s 54 to s 67 BCH code Error protection The TPS information transmitted in super-frame m' bits s 25 - s 39 always apply to super-frame m' + 1, whereas all other bits refer to super-frame m'.

13 cell_id = 0x1015 cell_id = 0x2117 Up to 65,536 cells per network

14 NITactual / other cell_id = 0x1015 Next fequency? network_id transport_stream_id orig_network_id f0 XONID? TSID? ter_deliv_sys_descriptor cell_freq_link_descriptor Recognize usable TSs faster! f1, cell_id1 fn, cell_idn f2, cell_id2 f3, cell_id3

15 cell_id = 0x1017 cell_id = 0x1110 cell_list_descriptor cell_id = 0x1015 Reduce scan to nearby cells! cell_id = 0x017A cell_id = 0x153C cell_idn lattituden longituden lat_extentn cell_id = 0x1533 cell_id = 0xA610 cell_id = 0x15AF long_extentn

16 Solution Part 2: Identifiers

17 National Services National Services Regional Services Different National Services Different Regional Services Yet Other Regional Services

18 NITactual / other network_id transport_stream_id orig_network_id SDTactual / other transport_str_id orig_network_id service_id linkage_decsriptor transport_stream_id original_network_id service_id mobile_hand-over_info() identical service in a neighbouring country local variation of the same service associated service

19 National Services National Services Regional Services Different National Services Different Regional Services identical service in a neighbouring country local variation of the same service Yet Other Regional Services associated service

20 Effort cell_list_desc NITother mobile hand-over linkage_desc svc_id, service_avail_desc cell_id ts_id, SDTother orig_nw_id, service_list_desc svc_id ts_id, orig_nw_id, svc_id (cell_id1; x1; y1; w1; h1), netw_id, ts_id, orig_nw_id netw_id, ts_id, orig_nw_id, svc_id cell_freq_link_desc (f1; cell_id1), frequecy_list_desc f1, f2,, fn Performance

21 Effort cell_list_desc NITother mobile hand-over linkage_desc svc_id, service_avail_desc cell_id ts_id, SDTother orig_nw_id, service_list_desc svc_id ts_id, orig_nw_id, svc_id (cell_id1; x1; y1; w1; h1), netw_id, ts_id, orig_nw_id netw_id, ts_id, orig_nw_id, svc_id cell_freq_link_desc (f1; cell_id1), frequecy_list_desc f1, f2,, fn Performance

22 Frequencies, topology and identifiers help us avoid those reception pot holes...

23 They cool help us put the back into Broadcast

24 If this is your in-car entertainment......dvb-t mobile reception will improve it!

25 Thank You Very Much For Your Attention!

26 Credits Slide 3: iphone 2011 Apple Inc. Slide 24: video by user crackervidfan on You Tube All other Photos: from The Commons collection on flickr All product names and logos may be registered trade marks and are properties of their respective owners.

27 Reading List ETSI TS Digital Video Broadcasting (DVB); Guidelines on implementation and usage of Service Information (SI) Mobile Reception of DVB-T Terrestrial DVB (DVB-T): A Broadcast Technology for Stationary Portable and Mobile Use Mobile DVB-T Using Antenna Diversity Receivers