Impulse Radio April 8, 2004 ISDWG April 8, 2004 Data Service Multiplex

Impulse Radio April 8, 2004 Complete Standard –RF Transmission –Main Program Audio Service –Data Service Multiplex and Transport Capability Data Service Multiplex non-disruptive to transmitters and receivers already in place ISDWG Goals and Objectives

Impulse Radio April 8, 2004 Definition –Channel coding and modulation Well defined –Defines a series of modes –Modes determine logical channel configuration –Logical channels have frame sizes and robustness –Logical channels have discernable I/O Can follow a line from a Logical Channel SDU to a specific set of RF carriers RF Transmission

Impulse Radio April 8, 2004 Definition –Source coding and compression of MPS Audio program material –Fields of information about the audio (PAD) –Multiplex Partly Defined –MPS structure and multiplex is going to be provided by iBiquity –CODEC definition is outside of the scope of the standard Main Program Audio Service

Impulse Radio April 8, 2004 Definition –Packaging data service information into a combined flow on the transport –Dividing the data flow into “packets” of information –Uniquely identifying the services packets belong to –Compatible with currently defined system Needs defining –MAT protocol Service Multiplex and Transport

Impulse Radio April 8, 2004 Relation to Standard Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data

Impulse Radio April 8, 2004 Relation to Standard Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data Data Service Multiplex Data Services

Impulse Radio April 8, 2004 Relation to Standard Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data Data Service Multiplex Data Services

Impulse Radio April 8, 2004 Related Layers Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data Data Service Multiplex Data Services

Impulse Radio April 8, 2004 Related Layer - MPS Multiplex Documents 1017s and 1028s –Structure of an MPS PDU (service PDU) –Carry MPA data (encoded audio) –PAD definition Functional Relevance –A service PDU is the structure that encapsulates service data inside a transfer frame (in L1) –A means to convey audio information from the transmitter to the receiver Highly specialized –Intended to duplicate analog audio broadcasting

Impulse Radio April 8, 2004 Related Layer - HD Radio Multiplex Layer Document 1014s –Layout of an L1 PDU Functional Relevance –L1 PDU aggregates service specific PDU’s (e.g. MPS PDU) –Inside of a L1 transfer frame

Impulse Radio April 8, 2004 Related Layer - HD Radio Multiplex Layer Note –Not all PDU formats exist in all modes for all logical channels –It is inferred from 1014s and 1011s which modes and which logical channels support the different formats MPS PDU Fills Entire Frame or MPS PDU fills 1 st part of frameOpportunistic data or MPS PDU fills 1 st part of frameFixed data or MPS PDUOpportunistic dataFixed data space or no MPS, only fixed data space

Impulse Radio April 8, 2004 Related Layer - HD Radio Multiplex Layer Note –There is no service specific PDU structure for gray areas –This is the area that will carry data service PDU’s MPS PDU Fills Entire Frame or MPS PDU fills 1 st part of frameOpportunistic data or MPS PDU fills 1 st part of frameFixed data or MPS PDUOpportunistic dataFixed data space or no MPS, only fixed data space

Impulse Radio April 8, 2004 Related Layer - Transmission Layer Document 1011s –Service modes with logical channel configurations –Logical channels transfer data in synchronized frames L1 PDU Unique characteristics (size, protection, etc.) –Logical channels map to RF carriers Functional Relevance –Move the audio and data to receivers Highly specialized –Many modes are designed to support different implementations of main program audio

Impulse Radio April 8, 2004 Related Layers Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data Data Service Multiplex Data Services

Impulse Radio April 8, 2004 Filling in the Gray Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Main Program Audio SIS Channel SIS Data Data Service Multiplex Data Services

Impulse Radio April 8, 2004 Filling in the Gray Transmission Layer L1 HD Radio Multiplex Layer L2 MPS Multiplex Data Service Multiplex Service PDU’s Aggregated PDU’s L1 PDU’s

Impulse Radio April 8, 2004 Filling in the Gray To this Point… –System has been described –Nothing new discussed After this Point –Fill in the blanks –Propose compatible Data Service Multiplex

Impulse Radio April 8, 2004 Filling in the Gray Requirements –Location within L1 PDU –Structure to carry service data MAT - Multiplex And Transport –Carries data service data from (as of yet) undefined services to receivers Applications or higher layered services that implement applications

Impulse Radio April 8, 2004 Location within L1 PDU MPS PDU Fills Entire Frame or MPS PDU fills 1 st part of frameOpportunistic data or MPS PDUOpportunistic dataFixed data space or no MPS, only fixed data space What do you need to know? –Which PDU format is contained in a logical channel? Mode, Logical Channel, L2 Header –MPS structure indicates end of MPS PDU –MPS Location and MAT structure locate MAT within L1 PDU

Impulse Radio April 8, 2004 Location in L1 PDU If the L2 PDU holds an MPS PDU –MAT PDU’s always come after the end of the MPS PDU Fixed data spaceOpportunistic dataMPS PDU Opportunistic dataMPS PDU fills 1 st part of frame

Impulse Radio April 8, 2004 Location in L1 PDU If L2 PDU only holds fixed PDU’s then the MAT PDU’s can be written from the first bit No MPS, only fixed data space

Impulse Radio April 8, 2004 Location in L1 PDU MAT PDU’s are written contiguously within the L2 PDU The MAT section of a PDU begins with the byte sequence “MAT” Following the “MAT” bytes a single byte is used to indicate the number of contiguous MAT PDU’s are present in the frame (255 is the maximum number) MPS PDU MAT2 4

Impulse Radio April 8, 2004 Compatibility MPS PDU Fills Entire Frame or MPS PDU fills 1 st part of frameOpportunistic data or MPS PDUOpportunistic dataFixed data space or no MPS, only fixed data space Current receivers only understand MPS PDU’s –Gray areas do not contain any service data they understand –They ignore the gray areas

Impulse Radio April 8, 2004 MPS PDU MAT2 4 MAT PDU Structure MAT PDU Characteristics –Within MAT PDU data from different services should coexist More than one service could be carried at a time –MAT PDU must fit in available space in L1 PDU’s For some L1 PDU’s this is variable Service “A” Service “B” Service “N”, etc

Impulse Radio April 8, 2004 MAT PDU Structure MAT PDU Characteristics –Data from a single service should be able to be carried on different logical channels Structure is channel independent and supportable in all modes MAT SpaceMPS PDUMAT Space Logical Channel P2 Logical Channel P3

Impulse Radio April 8, 2004 MAT PDU Structure MAT PDU Characteristics –Service data must be able to be subdivided and carried over multiple frames Part of object “A”MPS PDUMore of object “A”MPS PDU ALFN # n ALFN # n+m

Impulse Radio April 8, 2004 MAT PDU Structure MAT PDU Characteristics - Summary –Different service objects able to share same frame –Services can utilize any available logical channel –Service objects can be split in time on subsequent frames –MAT should accommodate variable length of available space in L1 PDU’s

Impulse Radio April 8, 2004 MAT PDU PDU Header –Control information –Deconstructing higher layered service data –Packaging it on an L1 PDU With or without MPS PDU’s –Allows receivers to rebuild objects on the other side Data Object Segment –All or portion of the higher layered service data

Impulse Radio April 8, 2004 PDU Header Fields Refer to document IR B