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[RF] Flex Abis Mode Configuration Huawei

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Flex Abis Mode

Description :

  • This parameter indicates the ways of assigning Abis timeslots for sites and cascaded sites.
  • Fixed: The Abis timeslots and Um timeslots are assigned fixedly.
  • Flex: Different services in a site share Abis timeslots, and different sites share Abis timeslots. The Abis timeslots are assigned dynamically according to actual commands.
  • SemiSolid: The Abis timeslots are fixedly assigned to the local BTS, and dynamically assigned to the upper-level BTS.
  • If the Flex Abis Mode of a site is set to be Flex, the Flex Abis Mode of the level-1 BTS that is cascaded with the site is set to be Flex.
  • If the Flex Abis Mode of a site is set to be SemiSolid, the Flex Abis Mode of the level-1 BTS that is cascaded with the site is set to be SemiSolid.

Speed Mode

Description :

  • This parameter determines the multiplexing mode of the timeslots on the Abis interface for the BTS.
  • There are two multiplexing modes: 64 kbit/s statistical multiplexing mode and 16 kbit/s physical multiplexing mode.
  • The 64 kbit/s statistical multiplexing mode is of the following types:

1:1 64 kbit/s statistical multiplexing mode

2:1 64 kbit/s statistical multiplexing mode

3:1 64 kbit/s statistical multiplexing mode

4:1 64 kbit/s statistical multiplexing mode

5:1 64 kbit/s statistical multiplexing mode

6:1 64 kbit/s statistical multiplexing mode

The six timeslot objects of the BTS are as follows:

OML: Operation and maintenance link of the BTS.

  • One BTS is configured with one OML.
  • In 64 kbit/s statistical multiplexing mode, one 64 kbit/s OML can be multiplexed with only the RSL of the same-level BTS.
  • In 16 kbit/s physical multiplexing mode, the 16 kbit/s OML occupies one 16 kbit/s timeslot.

ESL: Extend signaling link of the BTS.

  • When the BTS supports Flex Abis and uses the 64 kbit/s statistical multiplexing mode, the 64 kbit/s timeslot should be assigned, and the ESL is fixedly multiplexed with the OML onto one 64 kbit/s timeslot.
  • In 16 kbit/s physical multiplexing mode, timeslot resources are not assigned, and the ESL and OML use the same timeslot resources.

RSL: Signaling link of a TRX.

  • Each TRX is configured with one RSL.
  • In 64 kbit/s statistical multiplexing mode, one 64 kbit/s RSL can be multiplexed only with the OML of the same-level BTS or with the RSL of the same cabinet group.
  • In 16 kbit/s physical multiplexing mode, the 16 kbit/s RSL occupies one 16 kbit/s timeslot.

TCH: Traffic Channel of the TRX with a data rate of 16 kbit/s.

Idle: Idle timeslot of the BTS with a data rate of 16 kbit/s. The idle timeslot can be multiplexed only with the TCH of the same cabinet group onto a 64 kbit/s timeslot.

Semi: Monitoring timeslot of the BTS with the data rate of 8 kbit/s, 16 kbit/s, 32 kbit/s, and 64 kbit/s. The monitoring timeslot can be multiplexed with only the semipermanent link.

An E1 (2.048 Mbit/s) can be divided into thirty-two 64 kbit/s timeslots, and timeslot 0 is used for synchronization.

 

In statistical multiplexing mode, signaling timeslots (OML and RSL, RSL and RSL) are multiplexed onto one E1 timeslot.For example, in 4:1 multiplexing mode, three RSLs and one OML (or four RSLs) of one BTS can be multiplexed onto one 64 kbit/s timeslot.

When this parameter is set to 5:1 or 6:1, the Flex Abis function must be enabled.

In Flex Abis mode, a maximum of 1OML+2RSLs+1ESL can be multiplexed onto one 64 kbit/s timeslot.

When this parameter is set to 5:1, five RSLs are multiplexed onto one 64 kbit/s timeslot.

When this parameter is set to 6:1, six RSLs are multiplexed onto one 64 kbit/s timeslot.

After the Flex Abis function is enabled, an ESL is required to transmit the Abis timeslot dynamic connection message on the Abis interface. In 64 kbit/s statistical multiplexing mode, the ESLs and OMLs must be physically multiplexed onto the 64 kbit/s timeslot of the same E1. Therefore, the maximum number of RSLs multiplexed with the OMLs must be adjusted so that a maximum of two RSLs (three RSLs previously) can be multiplexed.

In 4:1 multiplexing mode, if there is one or two RSLs left, configure one or two 64 kbit/s timeslots with the 5:1 or 6:1 multiplexing mode (five or six RSLs multiplexed onto one 64 kbit/s timeslot) to avoid the usage of one extra 64 kbit/s timeslot on the Abis interface.

Huawei | BSC6000

 

Author: TheBeeliever

Think Beelieve | Always Feel, Rich, Beelieve. Works as Telecommunication Engineer and try to built "Personal Online Store". Have interesting on Online Shop, Photograph, Football, Music, and Travelling. Enjoy my life with my wife and son in nice city on Central Java. Share of what i see, hear, and feel. Contact Us Gmail : bian.hardiyanto Twitter : @bian_hardiyanto Facebook : Bian Hardiyanto BB : 76AF6096

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