dvb-t mobile handover - deutsche tv-plattform · 2014-12-30 · the mobility use-cases of dvb-t are...
TRANSCRIPT
Understand
DVB-T Mobile
Handoverin 20 Minutes
or Your Money Back
cool
was personal wireless long before
wirelesswas
Broadcast
Compared to this...
...mobile DVB-T may seem like this...
...but actually it’s more like this.
The mobility use-cases of
DVB-Tare centered around
vehicle based
reception
DVB-T Mobility does not add any new
modulation features
Signalling
The solution is solely based on
Service available?If yes: frequency and IDs?
If not: ???
Next fequency?Munich
Salzburg
Stuttgart
Solution Part 1:
Frequencies and Topology
NITactual / other
network_idtransport_stream_idorig_network_id
f1f2
f3 fn
ter_deliv_sys_descriptor
frequency_list_descriptor
ONID?TSID?f0
Next fequency?
ETSI
ETSI EN 300 744 V1.6.1 (2009-01) 31
4.6.2 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, ! value, code rate(s), super-frame indicator and guard interval onto the bit combinations is performed according to clauses 4.6.2.1 to 4.6.2.8. The left most bit is sent first.
Table 9: TPS signalling information and format
Bit number Format Purpose/Content s0 see clause 4.6.2.1 Initialization
s1to s16 0011010111101110 or 1100101000010001
Synchronization word
s17 to s22 see clause 4.6.2.3 Length indicator (see annex F) s23, s24 see table 10 Frame number s25, s26 see table 11 Constellation
s27, s28, s29 see table 12 Hierarchy information (see annex F) s30, s31, s32 see table 13 Code rate, HP stream s33, s34, s35 see table 13 Code rate, LP stream
s36, s37 see table 14 Guard interval s38, s39 see table 15 Transmission mode (see annex F)
s40 to s47 see clause 4.6.2.10 Cell identifier s48 to s53 all set to "0" See annex F s54 to s67 BCH code Error protection
The TPS information transmitted in super-frame m' bits s25 - s39 always apply to super-frame m' + 1, whereas all other bits refer to super-frame m'.
4.6.2.1 Initialization The first bit, s0, is an initialization bit for the differential 2-PSK modulation. The modulation of the TPS initialization bit is derived from the PRBS sequence defined in clause 4.5.2. This process is described in clause 4.6.3.
4.6.2.2 Synchronization Bits 1 to 16 of the TPS is a synchronization word.
The first and third TPS block in each super-frame have the following synchronization word:
s1 - s16 = 0011010111101110.
The second and fourth TPS block have the following synchronization word:
s1 - s16 = 1100101000010001.
4.6.2.3 TPS length indicator The first 6 bits of the TPS information is used as a TPS length indicator (binary count starting from and including bit s17) to signal the number of used bits of the TPS.
cell_id = 0x1015
cell_id = 0x2117
Up to 65,536 cells per network
NITactual / other
network_idtransport_stream_idorig_network_id
ter_deliv_sys_descriptor
cell_freq_link_descriptor
ONID?TSID?f0
Next fequency?
f1, cell_id1
f3, cell_id3
f2, cell_id2
fn, cell_idn
cell_id = 0x1015
XRecognize usable TSs faster!
cell_list_descriptor
cell_idn
lattituden
longituden
lat_extentn
long_extentn
cell_id = 0x1015
cell_id = 0x1017cell_id = 0x1110
cell_id = 0x15AF
cell_id = 0x153C
cell_id = 0x017A
cell_id = 0x1533
cell_id = 0xA610
Reduce scan to nearby cells!
Solution Part 2:
Identifiers
National Services
National Services
Regional Services
Yet Other Regional Services
Different National Services
Different Regional Services
NITactual / other
network_idtransport_stream_idorig_network_id
SDTactual / other
transport_str_idorig_network_id
service_id
linkage_decsriptor
transport_stream_idoriginal_network_id
service_idmobile_hand-over_info()
identical service in a neighbouring country
local variation of the same service
associated service
National Services
National Services
Regional Services
Yet Other Regional Services
Different National Services
Different Regional Services
identical service in a neighbouring country
local variation of the same service
associated service
Performance
Effo
rt NITother
frequecy_list_desc
cell_freq_link_desc
cell_list_desc
mobile hand-over linkage_desc
service_list_desc
SDTother
service_avail_desc
f1, f2, …, fn
(f1; cell_id1), …
(cell_id1; x1; y1; w1; h1), …
netw_id, ts_id, orig_nw_id, svc_id
netw_id, ts_id, orig_nw_id
ts_id, orig_nw_id, svc_id
svc_id, cell_id
ts_id, orig_nw_id, svc_id
Performance
Effo
rt NITother
frequecy_list_desc
cell_freq_link_desc
cell_list_desc
mobile hand-over linkage_desc
service_list_desc
SDTother
service_avail_desc
f1, f2, …, fn
(f1; cell_id1), …
(cell_id1; x1; y1; w1; h1), …
netw_id, ts_id, orig_nw_id, svc_id
netw_id, ts_id, orig_nw_id
ts_id, orig_nw_id, svc_id
svc_id, cell_id
ts_id, orig_nw_id, svc_id
Frequencies, topology and identifiers help us avoid those reception pot holes...
coolThey help us put the
back intoBroadcast
If this is your in-car entertainment...
...DVB-T mobile reception will improve it!
Thank You Very MuchFor Your Attention!
@c_alpha
• 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.
Credits
• ETSI TS 101 211Digital Video Broadcasting (DVB); Guidelines on implementation and usage of Service Information (SI)http://www.etsi.org/deliver/etsi_ts/101200_101299/101211/01.10.01_60/ts_101211v011001p.pdf
• Mobile Reception of DVB-Thttp://www.dvb.org/documents/white-papers/dvbtpaper.pdf
• Terrestrial DVB (DVB-T): A Broadcast Technology for Stationary Portable and Mobile Usehttp://www.tijbc.com/pruebas-7419/I0782913.pdf
• Mobile DVB-T Using Antenna Diversity Receivershttp://www.teamcast.us/data/upload/files/BIBFILE_FILE_J5RoETZ.pdf
Reading List