Half Rate and HOPPING

[mojiiiiii]

If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence, thus reducing the
benefit reached with hopping over all frequencies in an MA-list. With random
hopping the HR channels are hopping over all frequencies defined in the MA-list
thus getting the same profit from frequency hopping as FR channels.



my doubt is:what is te reson of it:
If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence

THANKS

[s52d]

????
HSN=0 is just special case of hopping.

Even if you have NO hopping, HR is same:
20 ms of speech is spread over four bursts, not over eight burtsts.
One lost burst makes 12.5% of bits for FR/EFR and can be recovered; while one lost burst
in HR mens 25% of bits lost, so whole 20 ms sample is lot (both samples, 40 ms).

BR
s52d


If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence, thus reducing the
benefit reached with hopping over all frequencies in an MA-list. With random
hopping the HR channels are hopping over all frequencies defined in the MA-list
thus getting the same profit from frequency hopping as FR channels.



my doubt is:what is te reson of it:
If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence

THANKS

[apollo13]

If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence, thus reducing the
benefit reached with hopping over all frequencies in an MA-list. With random
hopping the HR channels are hopping over all frequencies defined in the MA-list
thus getting the same profit from frequency hopping as FR channels.



my doubt is:what is te reson of it:
If cyclic hopping (HSN = 0) is used, then the Half Rate channels use only half of
the frequencies defined in the MA-list in the hopping sequence

THANKS

Hi Moji,

HR/FR and Hopping are different things. HR/FR are not related to Hopping but related to Capacity. If you have some TS assigned as HR then this TS will handle 2 conversations instead of one. If the TS is assigned as FR then this TS will handle 1 conversation per time.

Hopping mode (BBH or SFH) always have a MAL (Mobile allocation List) which means a list of available frequencies to be used by a specific cell. All calls (all of them) will use all frequencies in the MAL no matter which HSN you are using. HSN can be from 0 to 63. If HSN is different from 0 it means that the sequence of frequencies that a given Call will use will be pseudo aleatory. On the other hand if HSN=0 the sequence will be sequential (it means that the call will hop using the frequencies in the same order it appears in the MAL).

I hope I could clear your doubt.

Best regards,

[Mazen]

thanks brother for nice topic

[sarojmishra05]

This topic makes few of my doubts clear. Its a gud one.

[hekmeh30]

This topic makes few of my doubts clear. Its a gud one.
Thks for the info

[inf018]

I knew these parameters but just the basic details.
Thanks a lot guys for the detailed explanation. I really appreciate it.

[agungpur]

HR, FR, and hopping are different things and better discussed in different thread for good explanation in this forum.