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Method for transmitting multimedia packet data using a contention-resolution process
| Details |
Inventors: Creedon, Tadhg; Law, David J.; Lockyer, Terence D.; Horspool, Nigel;
Assignee: 3COM Technologies (Georgetown, KY)
Primary Examiner: Ngo; Ricky
Assistant Examiner: Tran; Phuc
Attorney, Agent or Firm: Nixon & Vanderhye, P.C.
A method of operating a repeater for a packet-based data transmission system wherein the repeater has a receiving port associated with a buffer whereby packets received at the port are temporarily stored before they are onwardly transmitted and wherein the repeater performs a contention resolution process such that if an attempted onward transmission of a packet is prevented by virtue of contention with a prior or an existing transmission, a subsequent attempt at transmission of that packet is delayed for a time which is likely to be substantially greater than a selected minimum time. The method includes examining a received packet to determine whether the packet is a multi-media packet, and giving the packet a higher priority in the contention resolution process such that if the packet is not transmitted onwardly owing to contention with a prior transmission, a fresh attempt at transmission of the packet is made on the expiry of the selected minimum time. |
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DETAILED DESCRIPTION The present invention is based on a technique wherein packets received at a receiving port of a repeater are buffered and at least partially parsed or examined to determine whether they are multi-media packets.
If a packet is thereby determined to be from a source or intended for a destination which is identified as a multi-media device the device may be identified in a look-up table so that subsequent packets from the same source or to the same destination may be identified as multi-media packets by reference to the look-up table.
A multi-media packet identified in this manner is given priority by the modification of the contention-resolution rules in its favour.
In particular, whereas according to the ordinary rules, packets cannot be transmitted if there is detection of contention and must wait for a pseudo random period before a further attempt to transmit is made, a packet which is given priority according to the invention can be the subject of a new attempt to transmit after a fixed time from the detection of contention.
If the packet is not so treated, then it w ill be transmitted according normal contention resolution rules operative in the repeater, such that if contention is detected re-transmission will be attempted after a pseudo random delay.
Provided that multi-media traffic is a fairly low percentage of traffic through the repeater, for example not greater than ten percent, the technique may work well because the bulk of the signal traffic through the repeater will not be given unfair advantage.
The technique is intended to improve consistency of latency for multi-media traffic not necessarily to improve the throughput of it.
The technique according to the invention may be relevant to any bridge-repeater design, where bridging is made between segments and repeating performed on each segment and it may be adapted for systems with both half and full duplex link, with buffering at a receive port only or with buffering both at transmit ports and receive ports
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