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Two-phase PDU segmentation between LLC and RLC to increase overall system throughput

IP.com Disclosure Number: IPCOM000005032D
Original Publication Date: 2001-Jul-24
Included in the Prior Art Database: 2001-Jul-24

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Walter Featherstone Davood Molkdar


This paper describes a new technique that enables code reselection, in a multi-code data rate system, on a more frequent basis matched with the feed back interval. The technique is based on using a two-phase segmentation of packet data units (PDU) between Logical Link Control (LLC) and Radio Link Control (RLC) rather than the normal segmentation of LLC into RLC blocks using the prevailing code. Such a technique improves the system performance as the probability of receiving the RLC blocks correctly is increased due to finer code matching to the radio channel condition. To illustrate the problem and solution, GPRS/EGPRS (General Packet Radio System / Enhanced GPRS) RLC protocol is used; the technique is, however, equally applicable to other multi-code rate systems employing similar type of protocols.