Abstract: A node is suitable for a wireless network. A wireless network comprises one or more sensor nodes and/or one or more control nodes. In the wireless network, the sensor node transmits in response to a sensed event and/or a request from a control node. A transmission/routing of data between a sensor node and/or a control node may be subject to a policy constraint and a resource constraint.

Abstract: A digital compressed video signal transmission system includes a transport processor for segmenting compressed MPEG video data into transport cells for transmission. A plurality of data fields in each transport cell are utilized to uniquely define transmitted data, provide system synchronization and to provide for detection of lost or corrupted data. These data fields include fields which indicate the service to which the data relates, the state of signal scrambling, a field identifying the one of several alternative formats in which the cell payload is arranged, a continuity count for determining data continuity, and a payload of either compressed video data or data auxiliary to the compressed video data.

Abstract: A digital compressed video signal transmission system includes a transport processor for segmenting compressed MPEG video data into transport cells for transmission. Prior to formation of the transport cells, at least a portion of the 32-bit MPEG slice start codes are excised from the compressed data. An entry pointer is generated to indicate the location of the beginning of a slice, which pointer is included in a transport cell header. In a corresponding receiver, the transport header is examined for a slice entry pointer, and if one is found, a slice start code is inserted in the transport payload data stream at the location indicated by the pointer so as to provide a signal according to the MPEG protocol.

Abstract: A digital compressed video signal transmission system includes a transport processor for segmenting compressed MPEG video data into transport cells for transmission. Several protocol levels are utilized to uniquely define transmitted data, provide system synchronization and to provide for detection of lost or corrupted data. Transport cells are formed of three levels, the first of which indicates the service to which the data relates and includes a field indicating the state of signal scrambling. The second level includes a field identifying the one of several alternative formats in which the cell payload is arranged, and a continuity count for determining data continuity. The third level includes the payload and a field which indicates decodable entry points for re-entering the data stream after having lost data.

Abstract: A digital compressed video signal transmission system includes a transport processor for segmenting compressed data into transport cells for transmission. Particular portions of the compressed data are formatted into further transport cells, which further transport cells are interspersed with normally occurring transport cells. The further transport cells include redundant video signal data which may be utilized to resynchronize a compressed video signal decoder after loss or corruption of transmitted data.

Abstract: A vide signal encoding system includes apparatus for segmenting encoded video data into transport blocks for signal transmission. The transport block format enhances signal recovery at the receiver by virtue of providing header data from which a receiver can determine re-entry points into the data stream on the occurrence of a loss or corruption of transmitted data. The number of re-entry points are maximized by providing secondary transport headers embedded within encoded video data in respective transport blocks.

Abstract: Apparatus for decoding an HDTV signal conveyed as high and low priority data in high and low priority channels respectively, wherein said high and low priority data originated from blocks of hierarchically encoded compressed video data, with data of greater importance for image reproduction from each block allocated to the high priority channel and the remaining data from each block allocated to the low priority channel, includes circuitry for identifying and segmenting high and low priority data for corresponding blocks and recombining the high and low priority data into an hierarchically encoded compressed video data stream.