record or remaining part of the record relative to the location of hash and, thus, the time interval for wait before the record can be tuned and cached. Assume that a broadcast cycle pushes the hashing parameters H(Rí) [H and S] and record The functions H and S help in tuning to the H(Rí) and Rí. hence to as follows—H gives a key which in turn gives the location of Rí H(Rí) in the broadcast data. In case H generates a key that does not provide the location of H(Rí) by itself, then the device computes the location from S after the location of H(Rí). That location has the sequential records and Rí the devices tunes to the records from these locations. In case the device misses the record in first cycle, it tunes and caches that in next or some other cycle. Index-Based Method Indexing is another method for selective tuning. Indexes temporarily map the location of the buckets. At each location, besides the bits for the bucket in record of interest data, an offset value may also be specified there. While an index maps to the absolute location from the beginning of a broadcast cycle, an offset index is a number which maps to the relative location after the end of present bucket of interest. Offset means a value to be used by the device along with the present location and calculate the wait period for tuning to the next bucket. All buckets have an offset to the beginning of the next indexed bucket or item. Indexing is a technique in which each data bucket, record, or record block of interest is assigned an index at the previous data bucket, record, or record block of interest to enable the device to tune and cache the bucket after the wait as per the offset value. The server transmits this index at the beginning of a broadcast cycle as well as with each bucket corresponding to data of interest to the device. A disadvantage of using index is that it extends the broadcast cycle and hence increases taccess. The index I has several offsets and the bucket type and flag information. A typical index may consist of the following: which defines the offset to first bucket of nearest index. Ioffset(1) Additional information about Tb, which is the time required for caching the bucket bits in full after the device tunes to and starts caching the bucket. This enables transmission of buckets of variable lengths. which is the index offset of next bucket record of interest. Ioffset (next)
record or remaining part of the record relative to the location of hash and, thus, the time interval for wait before the record can be tuned and cached. Assume that a broadcast cycle pushes the hashing parameters H(Rí) [H and S] and record Rí. The functions H and S help in tuning to the H(Rí) and hence to Rí as follows—H gives a key which in turn gives the location of H(Rí) in the broadcast data. In case H generates a key that does not provide the location of H(Rí) by itself, then the device computes the location from S after the location of H(Rí). That location has the sequential records Rí and the devices tunes to the records from these locations. In case the device misses the record in first cycle, it tunes and caches that in next or some other cycle. Index-Based Method Indexing is another method for selective tuning. Indexes temporarily map the location of the buckets. At each location, besides the bits for the bucket in record of interest data, an offset value may also be specified there. While an index maps to the absolute location from the beginning of a broadcast cycle, an offset index is a number which maps to the relative location after the end of present bucket of interest. Offset means a value to be used by the device along with the present location and calculate the wait period for tuning to the next bucket. All buckets have an offset to the beginning of the next indexed bucket or item. Indexing is a technique in which each data bucket, record, or record block of interest is assigned an index at the previous data bucket, record, or record block of interest to enable the device to tune and cache the bucket after the wait as per the offset value. The server transmits this index at the beginning of a broadcast cycle as well as with each bucket corresponding to data of interest to the device. A disadvantage of using index is that it extends the broadcast cycle and hence increases taccess. The index I has several offsets and the bucket type and flag information. A typical index may consist of the following: Ioffset(1) which defines the offset to first bucket of nearest index. Additional information about Tb, which is the time required for caching the bucket bits in full after the device tunes to and starts caching the bucket. This enables transmission of buckets of variable lengths. Ioffset (next) which is the index offset of next bucket record of interest.