RE: One-way transmission budget

["Akhter, Mohammad" <Mohammad.Akhter@xxxxxxx>]

Hi Kevin and Jouni,

 

Although, HARQ latency in LTE based system is as you mention, this is expected to be reduced as we move towards 5G (e.g., could go towards 1msec). In addition, smaller cell size is expected to co-exist and this will reduce the link traversal time for such smaller cells.

 

Assuming the specification is forward looking, it would be good to have profile based latency targets, e.g., profile for LTE and legacy system could stay with 1 msec one way latency, whereas, profile for 5G and small cell could target lower latency.

 

 

Regards,

-          mohammad

 

 

Mohammad Akhter | Director, Architecture | Direct: 1 (613) 595 6279 | Mobile: 1 (613) 286 1840 | www.idt.com

 

From: stds-1904-3-tf@xxxxxxxx [mailto:stds-1904-3-tf@xxxxxxxx] On Behalf Of Jouni Korhonen
Sent: Monday, March 28, 2016 8:32 PM
To: Bross, Kevin
Cc: stds-1904-3-tf@xxxxxxxx
Subject: Re: One-way transmission budget

 

Kevin,

 

Within the current mappers and use cases <1ms one way delay should be just fine. I think we can assume that in this version of the to-be-spec safely. 

 

Jouni

Sent from a smart phone.. Mind the typos.

 

On Mar 28, 2016, at 3:09 PM, Bross, Kevin <kevin.bross@xxxxxxxxx> wrote:

All,

 

Is it reasonable to expect the one-way transmission time budget for RoE to be <1 ms?

·         TDD HARQ in LTE can be ~3 ms, but this has to include L1, L2, and L3 processing time, in addition to round-trip transmission times

·         Light in a fiber-optic cable travels at ~5 ns/m or ~5 µs/km

·         My experience is that most carriers have a one-way transmission budget of 100-250 µs in their systems

 

Is it reasonable to expect that the one-way transmission budget will be <1 ms?  This will help bound things as we look at issues like estimating what is required for presentation time offset.

 

Thanks,

--kb

 

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Kevin Bross                         Modular Systems Architect
2111 NE 25th Ave, M/S: JF3-466      Phone: 503-696-1411
Hillsboro, OR  97124                mailto:kevin.bross@xxxxxxxxx
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