RE: stds-80220-requirements: Packet Error Rate requirement

["Chickinsky, Alan" <alan.chickinsky@ngc.com>]

Title: Packet Error Rate requirement

Folk-

 

I am having a problem with a the use of ARQ at the physical layer.  If I use only IP, it what is called "connectionless" connection.  ICMP packets, which use IP are connectionless.  At some point we will define voice packets (ok VOIP) as connectionless, since these packet have an expiration time.  For voice,  if you exceed the expiration time, the packet is void.  So we need to define when we use ARQ and when not.  Or do we look at our satellite friends and use Forward Error Correction.  Then we assume we have one chance to get the data.  And if we loose or incorrectly correct the data, the upper layer will detect it.  Or is someone saying the proposed channel is so flaky that we cannot reliably transfer data.

 

Another example of a non ARQ physical layer is ATM (ok I bit my tongue).

 

Alan

 

 -----Original Message-----
From: Joseph Cleveland [mailto:JClevela@sta.samsung.com]
Sent: Wednesday, July 23, 2003 1:38 PM
To: stds-80220-requirements@ieee.org
Subject: stds-80220-requirements: Packet Error Rate requirement

Hi All,

Per the request on Monday here is a re-write of paragraph 4.1.10, Packet Error Rate, to initiate the discussion:

4.1.10  Packet Error Rate
The physical layer shall be capable of adapting the modulation, coding, and power levels to accommodate RF signal deterioration between the BS and user terminals.  The air interface shall use appropriate ARQ schemes to ensure that error rates are reduced to a suitably low level in order to accommodate higher level IP based protocols (for example, TCP over IP).  If the received Eb/No exceeds the minimum required value for reliable reception as specified in Section 4.2.1, the packet error rate for IP packet for any active call shall be less that 1 percent after channel decoding for error correction and before ARQ with a 95% confidence. 

Rationale
The purpose of the requirement is to specify the system performance for delivery of IP packets to the network interface from the air interface.  It is not written as a RF sensitivity requirement, which is covered in the RF section (4.2.1). 

An implied requirement is that if the link for the active call cannot maintain a packet error rate < 1%, the call "shall" be terminated.

Regards

Joseph Cleveland
Director, Systems & Standards
Wireless Systems Lab
Samsung Telecommunications America
Richardson, TX 75081
(O) 972-761-7981  (M) 214-336-8446  (F) 972-761-7909