• Flex Abis Mode Configuration Huawei

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.