[STDS-802-16] TC implementation

[Avi Freedman <avif@HEXAGONLTD.COM>]

OOPS, I sent this message before with the  wrong subject line.  Here is the question again with the right subject.   The email of the originator of the question is: fahimehnouri@yahoo.com

 

----- Original Message -----
From: Avi Freedman
To: STDS-802-16@listserv.ieee.org
Sent: Friday, April 09, 2004 1:16 PM
Subject: Re: [STDS-802-16] Clarification on OFDMA TDD frame duration


Here is a question I received.  Does anyone have a good answer? 
Avi

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We are working on hardware implementation of the MAC802.16. As a member of this group, I am working on the TC (Transmission Convergence) Sublayer and MAC interface of MAC802.16. During reception of information from Physical layer, Physical layer reports the number of irrecoverable

Bytes of each FEC code word; I wish to know which of the following methods is suitable for implementation.



1. We can verify HCS of each header and extract the length field, then buffer the data according that length. If the HCS was wrong, in next FEC Code word, we check the TC pointer to find out the PDU location and decide based on it.



2. If the physical layer reports an irrecoverable, we have to discard the packet and the job is running till we receive a packet without an irrecoverable. Then we use this packet to find the start of the header using TC pointer and if the next packet was erroneous, we discard part of the PDU we saved before.



Best Regards,

Fahimeh Nouri