Method to provide unequal error protection and unequal error detection for internet protocol applications
View Patent ↗A method and system for providing Voice over Internet Protocol (VoIP) in a wireless communications system using a Packet Data Conversion Protocol (PDCP) with enhanced functionality that allows sub-packets to be processed for transmission over different Radio Bearers (RB) with unequal or different levels of error protection and/or error detection based on perceptual importance of the bits in the sub-packets. The enhanced PDCP being operable to partition a packet into a plurality of sub-packets such that different levels of error protection and/or error detection may be applied to the packet. An overall gain in system capacity can be expected due to transmit power savings provided via unequal error detection and error protection.
1. A method of processing a plurality of sub-packets comprising the steps of:
receiving a first and a second sub-packet, wherein the first sub-packet was coded with a higher level of error protection than the second sub-packet, and the first sub-packet includes error detection information, and the first and second sub-packets are processed over respective different radio bearers;
checking the first sub-packet for errors using the error detection information; and combining the first and second sub-packets to form a packet
and, prior to the step of combining, checking the first sub-packet for errors;
transmitting an acknowledgement message if the first sub-packet did not include errors;
transmitting a negative acknowledgement message if the first sub-packet included errors; and
receiving a re-transmitted first sub-packet if a previous reception of the first sub-packet included bits with errors.
2. The method of claim 1 , wherein the first and second sub-packets include speech information and were received over a wireless communications link.
3. The method of claim 2 , wherein the first sub-packet includes error detection information and the second sub-packet does not include error detection information.
4. The method of claim 1 , wherein the first sub-packet includes bits corresponding to a coverage field indicated in the transport header information and the second sub-packet including bits not corresponding to the coverage field.