Dynamic robust header compression

摘要

A unit (25, 46) performs a compression operation or a decompression operation with respect to information for transmission in packets over a wireless link (36). The transmission over the wireless link is such that the packets may become reordered from a transmission sequence. The compression operation and the decompression operation involve a tradeoff of robustness and reordering depth. The robustness is an indicator of a degree of information loss over the link tolerated by the compression operation and the decompression operation; the reordering depth is a degree of packet reordering tolerated by the compression operation and the decompression operation. The unit dynamically adjusts the tradeoff of the robustness and the reordering depth in accordance with characteristics of the link. In an example embodiment, the information upon which the compression operation and the decompression operation is performed is sequence number information of a packet header.

主权项

1. A compressor that performs a compression operation to compress information transmitted in packets over a wireless link, the compression operation involving a tradeoff of robustness and reordering depth, wherein the robustness is an indicator of a degree of information loss over the wireless link tolerated by the compression operation, and wherein the reordering depth is a degree of packet reordering tolerated by the compression operation, the compressor comprising:
an interpretation interval adjuster, wherein the interpretation interval adjuster receives characteristics of the wireless link, and wherein the interpretation interval adjuster dynamically adjusts a ratio of the robustness and the reordering depth according to the characteristics of the wireless link by changing a number of compressed bits and the interpretation interval offset, wherein the ratio is expressed by an interpretation interval expressed in terms of the number of compressed bits and the interpretation interval offset, wherein the reordering depth is dependent upon the interpretation interval offset and the robustness is dependent upon the number of compressed bits and the interpretation interval offset, and wherein the number of compressed bits is expressed by a factor k and an enhancement factor S that increases the number of compressed bits and the interpretation interval; and a signal generator communicating with the interpretation interval adjuster, wherein the signal generator signals at least the enhancement factor S across the wireless link.