OMD000410 Abis Interface Networking Topologies ISSUE 1.0.ppt

HUAWEI TECHNOLOGIES CO., LTD.

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Abis Interface Networking Topologies

HUAWEI TECHNOLOGIES CO., LTD. Page 2All rights reserved

The Abis interface between BTS and BSC is connected through the base station interface equipment (BIE) board. Via BIE board, remote BTS can be flexibly connected to the BSC in a entirely transparent way, and also multiplex functions can be provided to maximize the use of limited transmission resources.


Position of BIE in HUAWEI GSM BSS System

E1HW B

IE

HW

BSC BTS

Abis interface

BS interface

BS interface

TMU


BIE Functions

BIE provides multiplex function with a maximum multiplex ratio of 15:1, which means 15 TRXs can be multiplexed to one E1.

In BMs, voice and signaling from GNET are sent to BIE over the BS interface (HW), and continuously sent to the BTS via the Abis interface (E1) after multiplexed. Information from a BTS is sent to GNET after a reversed de-multiplexing process.

BIE supports 8 HWs at most , 4 of which form one group.

BIE

BS Abis

HW E1


Gro

up0

3 4 5 6 7 8 9

0 1

PWC

2 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

BIE

0

BIE

1

BIE

2

BIE

3

BIE

4

BIE

5

BIE

6

BIE

7

BIE

8

BIE

9

BIE

10

BIE

11

BIE

12

BIE

13

BIE

14

BIE

15

BIE

16

25

PWC

BIE Groups

Gro

up1

Gro

up2

Gro

up3

Gro

up4

Gro

up5

Gro

up6

Gro

up７

Gro

up８


BIE Trunk Networking Modes

Star networking

6 E1 Port * 2 TRX/Port


Chain networking and tree networking

2 E1 Port * 64K LAPD/Port

2 E1 Port * 32K LAPD Multiplex Mode/Port

2 E1 Port Multiplex/Port

6 E1 Port * 2 TRX/Port (Support Link)


Ring networking

Full Rate Ring Topology

Half Rate Ring Topology

6 E1 Port (Support 16K)


Sim 12:1

Sim 10:1

6 E1 Port Half Rate Topology


Main Interface of BIE Trunk Mode


Chapter 1 Star NetworkingChapter 1 Star Networking

Chapter 2 Chain and Tree Networking Chapter 2 Chain and Tree Networking

Chapter 3 Ring Networking Chapter 3 Ring Networking


Star Networking

BTS

BTS

BSC

BTS

BTS


Star Networking

For the TMU at the BTS side, only port 0 is available for star networking, because at this time the BTS obtains the clock synchronization signal only from port 0.

3

2

1

0

TMU

E1


Star Networking




Star Networking (4 E1 Ports)

In star networking, only port 0, 1, 2, and 3 are available for BIE. The HW0 group can be multiplexed to port 0 and 1, while the HW1 group can be multiplexed to port 2 and 3.

HW0 and HW1 respectively includes 4 HWs.

5

4

3

2

1

0

HW1

E1

BIE

HW0

E1

E1

E1


Star Networking (6 E1 Ports)

In special star networking, port 0, 1, 2, 3, 4, and 5 are available for BIE. At the BSC side, however, only the HW0 group is available, which includes 4 HWs and allows for 12 TRXs. The 6 E1s share the 12 TRXs evenly, so each E1 allows for at most 2 TRXs.

5

4

3

2

1

0

HW0

BIEE1

E1

E1

E1

E1

E1

SPECIAL


BS&Abis Timeslot Mapping for 4 E1 Ports Star Networking E1 0 1 2 3 4 5 6 70 SYNC1 T0C0 T0C1 T0C2 T0C3 2 T0C4 T0C5 T0C6 T0C7 3 4 T1C0 T1C1 T1C2 T1C3 5 T1C4 T1C5 T1C6 T1C7 6 RSL1 7 T2C0 T2C1 T2C2 T2C3 8 T2C4 T2C5 T2C6 T2C7 9 10 T3C0 T3C1 T3C2 T3C3 11 T3C4 T3C5 T3C6 T3C7 12 RSL3 13 T4C0 T4C1 T4C2 T4C3 14 T4C4 T4C5 T4C6 T4C7 15 RSL4 16 T5C0 T5C1 T5C2 T5C3 17 T5C4 T5C5 T5C6 T5C7 18 RSL5 19 idle

20 .21 .22 .23 .24 .25 .26 .27 .28 .29 .30 idle31

RSL0

RSL2

OML

HWTS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7 0 S0T0C0 S0T4C0 S1T2C0 S0RSL01 S0T0C1 S0T4C1 S1T2C1 S0RSL12 S0T0C2 S0T4C2 S1T2C2 S0RSL23 S0T0C3 S0T4C3 S1T2C3 S0RSL34 S0T0C4 S0T4C4 S1T2C4 S0RSL45 S0T0C5 S0T4C5 S1T2C5 S0RSL56 S0T0C6 S0T4C6 S1T2C6 S1RSL07 S0T0C7 S0T4C7 S1T2C7 S1RSL18 S0T1C0 S0T5C0 S1T3C0 S1RSL29 S0T1C1 S0T5C1 S1T3C1 S1RSL310 S0T1C2 S0T5C2 S1T3C2 S1RSL411 S0T1C3 S0T5C3 S1T3C3 S1RSL512 S0T1C4 S0T5C4 S1T3C4 13 S0T1C5 S0T5C5 S1T3C5 14 S0T1C6 S0T5C6 S1T3C6 15 S0T1C7 S0T5C7 S1T3C716 S0T2C0 S1T0C0 S1T4C017 S0T2C1 S1T0C1 S1T4C118 S0T2C2 S1T0C2 S1T4C219 S0T2C3 S1T0C3 S1T4C320 S0T2C4 S1T0C4 S1T4C421 S0T2C5 S1T0C5 S1T4C522 S0T2C6 S1T0C6 S1T4C623 S0T2C7 S1T0C7 S1T4C724 S0T3C0 S1T1C0 S1T5C025 S0T3C1 S1T1C1 S1T5C126 S0T3C2 S1T1C2 S1T5C227 S0T3C3 S1T1C3 S1T5C328 S0T3C4 S1T1C4 S1T5C429 S0T3C5 S1T1C5 S1T5C5 S1OML030 S0T3C6 S1T1C6 S1T5C631 S0T3C7 S1T1C7 S1T5C7 S0OML0

No.1 HW No.2 HW No.3 HW No.4 HW


BS&Abis Timeslot Mapping for 6 E1 Ports Star NetworkingE1 0 1 2 3 4 5 6 70 1 T0C0 T0C1 T0C2 T0C3 2 T0C4 T0C5 T0C6 T0C7 3 4 T1C0 T1C1 T1C2 T1C3 5 T1C4 T1C5 T1C6 T1C7 6 7 idle8 .9 .10 .11 .12 .13 .14 .15 .16 .17 .18 .19 .20 .21 .22 .23 .24 .25 .26 .27 .28 .29 .30 idle

31 OML

SYNC

RSL0

RSL1

HWTS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7

0 S0T0C0 S2T0C0 S4T0C0 S0RSL01 S0T0C1 S2T0C1 S4T0C1 S0RSL12 S0T0C2 S2T0C2 S4T0C2 S1RSL03 S0T0C3 S2T0C3 S4T0C3 S1RSL14 S0T0C4 S2T0C4 S4T0C4 S2RSL05 S0T0C5 S2T0C5 S4T0C5 S2RSL16 S0T0C6 S2T0C6 S4T0C6 S3RSL07 S0T0C7 S2T0C7 S4T0C7 S3RSL18 S0T1C0 S2T1C0 S4T1C0 S4RSL09 S0T1C1 S2T1C1 S4T1C1 S4RSL110 S0T1C2 S2T1C2 S4T1C2 S5RSL011 S0T1C3 S2T1C3 S4T1C3 S5RSL112 S0T1C4 S2T1C4 S4T1C4 13 S0T1C5 S2T1C5 S4T1C5 14 S0T1C6 S2T1C6 S4T1C6 15 S0T1C7 S2T1C7 S4T1C7 16 S1T0C0 S3T0C0 S5T0C0 17 S1T0C1 S3T0C1 S5T0C1 18 S1T0C2 S3T0C2 S5T0C2 19 S1T0C3 S3T0C3 S5T0C3 20 S1T0C4 S3T0C4 S5T0C4 21 S1T0C5 S3T0C5 S5T0C5 S5OML022 S1T0C6 S3T0C6 S5T0C6 23 S1T0C7 S3T0C7 S5T0C7 S4OML024 S1T1C0 S3T1C0 S5T1C0 25 S1T1C1 S3T1C1 S5T1C1 S3OML026 S1T1C2 S3T1C2 S5T1C2 27 S1T1C3 S3T1C3 S5T1C3 S2OML028 S1T1C4 S3T1C4 S5T1C4 29 S1T1C5 S3T1C5 S5T1C5 S1OML030 S1T1C6 S3T1C6 S5T1C6 31 S1T1C7 S3T1C7 S5T1C7 S0OML0








Star networking



Chain networking and tree networking 2 E1 Port * 64K LAPD/Port





Ring networking





Sim 12:1

Sim 10:1



Chain Networking In chain networking, only port 0 and 2 are available for BIE. The groups HW0

and HW1 respectively include 4 HWs.

Because the clock quality becomes worse with the increase of cascade levels, the cascading depth should not exceed 5 levels.

54

3

2

1

0

HW1

BIE

HW0

E1

E1


Chain Networking: Single Chain

For single chain networking, port 0 and port 2 separately provide one pair of E1. The 2 E1s are respectively connected to different BTSs.

TMU

TMUTMU

BIE

TMU

TMU TMU

3

2

1

0

3

2

1

0

3

2

1

0E1E1

HW1

HW0

5

4

3

2

1

0

E1

3

2

1

0

3

2

1

0

3

2

1

0E1E1

E1


Chain Networking: Double Chains

For double chain networking, when the number of TRXs increases too many to support for an E1, BIE can provide two E1s respectively derived from port 0 and port 2, both of which respectively connect to port 0 and port 1 of the same TMU of BTS, thus to form double chains to support the required capacity.

TMU BIE TMUTMU

HW1

HW0

5

4

3

2

1

0

3

2

1

0

3

2

1

0

3

2

1

0

E1

E1

E1E1

E1

E1


Chain Networking

At the BTS side, the TMU has 4 available E1 ports. The timeslots of the 4 E1 ports are numbered uniformly.

3

2

1

0

TMUPort 0 timeslots: 0~31Port 1 timeslots: 32~63 Port 2 timeslots: 64~95Port 3 timeslots: 96~127


Chain Networking

For single chain networking, port 0 of TMU must be connected with the upper level BSC/BTS because BTS obtains clock synchronization signals only from port 0.

For port 1, 2 and 3, anyone can be connected with a lower level BTS.

3

2

1

0

TMU


Chain Networking

For double chains networking, the same as the single chain networking, port 0 of TMU must be connected with the upper level BSC/BTS to obtain the clock synchronization signal.

Normally, both of port 1 and port 0 are the input of double chains, while the both of port 2 and port 3 are the output of the double chains.

3

2

1

0

TMU


Chain Networking

In chain networking, TMU obtains the OML of the local site only from Timeslot 31 of port 0 and obtains TCL and RSL from other timeslots. The TCH, RSL and OML of the lower site is exchanged to the output of local site.

3

2

1

0

TS31OML


Chain Networking

The key to chain networking is TMU’s special processing of the OML of the lower level site.

A problem must be solved: the lower level site must also obtain OML from timeslot31 of port 0 in the local site; therefore, the lower level OML must be switched to timeslot63, 95 or 127, which is the timeslot31 of the E1 connected with port 0 of the lower level site. In this way, the lower level site can obtain the local OML correctly.

3

2

1

0

TMU

TS31OML0

TS30OML1

TS63OML1


Chain Networking

The switching in chain networking is not

real switching. In actual networking, it is

also impossible to design a switching

network for each TMU or each site. The

switching here is implemented by

timeslot description in data configuration

which manually provisions the timeslots

needing switching to the corresponding

timeslots. This manual provisioning is

semi-permanent and realized through

software setting. TMU

32

10


Chain Networking (64K LAPD Multiplex Mode)

2 E1 Port * 64K LAPD/Port, BIE supports the following three combinations:

10TRX + 10RSL + 1 OML

9 TRX + 9 RSL + 4 OML



Timeslot Allocation at BS Side for 64K LAPD Multiplex ModeTCH0 TS64TCH1 TS65TCH2 TS66TCH3 TS67TCH4 TS68TCH5 TS69TCH6 TS70TCH7 TS71TCH0 TS72TCH1 TS73TCH2 TS74TCH3 TS75TCH4 TS76TCH5 TS77TCH6 TS78TCH7 TS79

TRX8

TRX9

TCH0 TS0TCH1 TS1TCH2 TS2TCH3 TS3TCH4 TS4TCH5 TS5TCH6 TS6TCH7 TS7




TRX0

TRX1

TRX2

TRX3





TRX4

TRX5

TRX6

TRX7

RSL0 RSL1 RSL2 RSL3 RSL4 REL5 RSL6 RSL7 RSL8 RSL9

BOML6 TS114FOML6 TS115

BOML5 TS116FOML5 TS117BOML4 TS118FOML4 TS119BOML3 TS120FOML3 TS121

BOML2 TS122FOML2 TS123BOML1 TS124FOML1 TS125

BOML0 TS126FOML0 TS127

RSL

OML


10 TRX + 10 RSL + 1 OML

In this combination, timeslot 0 of E1 is fixedly configured as the frame synchronization signal.

The 8 TCHs of each TRX are multiplexed to the 2 timeslots of an E1. The TCHs of at most 10 TRXs can be multiplexed to one E1.

Because 64K full rate RSLs are used, the RSL of each TRX uses one timeslot of E1. Each TRX needs an RSL, so 10 TRXs needs 10 RSLs totally.

Timeslot 31 of E1 in Abis must be configured as OML.

As there is only one OML, the 10 TRXs must be configured for one site.

SYNCTCH0 TCH1 TCH2 TCH3

TCH4 TCH5 TCH6 TCH7 RSL0

TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7

RSL1TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7


RSL3TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL4TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7



RSL7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL8TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7

RSL9 OML

TRX6

TRX1

TRX7

TRX8

TRX9

TRX2

TRX3

TRX4

TRX5

TRX0



In this combination, the basic pattern is similar to 10 TRX. The difference is that TCHs and RSLs of only 9 TRXs are multiplexed to one E1.

Because of the reduction of one TRX, three more timeslots can be allocated for OML. Then 4 OMLs and the 9 TRXs can be allocated to at most 4 sites. TRX6

TRX1

TRX7

TRX8

TRX2

TRX3

TRX4

TRX5

TRX0

SYNC



RSL1

TCH0 TCH1 TCH2 TCH3

TCH4 TCH5 TCH6 TCH7

RSL2

TCH0 TCH1 TCH2 TCH3


TCH0 TCH1 TCH2 TCH3

TCH4 TCH5 TCH6 TCH7

RSL4


RSL5TCH0 TCH1 TCH2 TCH3

TCH4 TCH5 TCH6 TCH7

RSL6

TCH0 TCH1 TCH2 TCH3

TCH4 TCH5 TCH6 TCH7


TCH4 TCH5 TCH6 TCH7

RSL8

OML1

OML0

OML2 OML3



In this combination, the basic pattern is similar to 10 TRX. The difference is that TCHs and RSLs of only 8 TRXs are multiplexed to one E1.

Because of the reduction of TRXs, 6 more timeslots can be allocated for OML. Then 7 OMLs and the 8 TRXs can be allocated to at most 7 sites.

TRX7

SYNCTCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7




RSL2







RSL7

OML0

OML1

OML6 OML5

OML4

OML2

OML3

TRX6

TRX5

TRX4

TRX3

TRX2

TRX1

TRX0


Chain Networking (32K LAPD Multiplex Mode)

For 2 E1 Port * 32K LAPD Multiplex Mode/Port, BIE supports the following combinations:





Timeslot Allocation at BS1 Side for 32K LAPD Multiplex ModeTCH0 TS64TCH1 TS65

TCH2 TS66TCH3 TS67TCH4 TS68TCH5 TS69TCH6 TS70TCH7 TS71




TRX8

TRX9

TRX10

TRX11





TRX0

TRX1

TRX2

TRX3

TCH0 TS32TCH1 TS33TCH2 TS34TCH3 TS35TCH4 TS36TCH5 TS37TCH6 TS38TCH7 TS39TCH0 TS40TCH1 TS41TCH2 TS42TCH3 TS43TCH4 TS44TCH5 TS45TCH6 TS46TCH7 TS47



TRX4

TRX5

TRX6

TRX7

RSL0+1 TS96

TS97RSL2+3 TS98

TS99 RSL4+5 TS100

TS101 RSL6+7 TS102

TS103 RSL8+ 9 TS104

TS105

BOML6 TS114FOML6 TS115BOML5 TS116FOML5 TS117BOML4 TS118FOML4 TS119BOML3 TS120FOML3 TS121BOML2 TS122FOML2 TS123BOML1 TS124FOML1 TS125BOML0 TS126FOML0

RSL

OML

RSL10+11 TS106


SYNCTCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL0 RSL1

TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL2 RSL3TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL4 RSL5TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL6 RSL7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL8 RSL9TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7

TRX0TRX1

OML

RSL10

TRX2

TRX4

TRX6

TRX8

TRX3

TRX5

TRX7

TRX9TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TRX10


TRX11


The 8 TCHs of each TRX are multiplexed to 2 timeslots of an E1. The TCHs of at most 12 TRXs can be multiplexed to one E1.

Because 32k half rate RSLs are used, the RSLs of each two TRXs share one E1 timeslot. 12 TRXs needs altogether 6 RSLs.


11 TRX + 6 RSL + 3 OMLSYNC

TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL0 RSL1


TRX0TRX1

OML0OML1OML2

RSL10

TRX2

TRX4

TRX6

TRX8

TRX3

TRX5

TRX7

TRX9TCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7TRX10

In this combination, the basic pattern is similar to12 TRX. The difference is that TCHs and RSLs of only 11 TRXs are multiplexed to an E1

Because RSL11 and RSL10 are originally multiplexed to timeslot 28, although E1RSL11 is absent, RSL10 still has to use timeslot 28 of the E1. The absence of TRX11 only results in 2 more timeslots for OML. Thus, 3 OMLs and the 11 TRXs can be allocated to at most 3 sites.



In this combination, the basic pattern is similar to12 TRX. The difference is that TCHs and RSLs of only 10 TRXs are multiplexed to one E1.

Because RSL11 and RSL10 are originally multiplexed to timeslot 28, the absence of RX10 and TRX11 results in 5 more timeslots for OML. As such, 5 OMLs and the 10 TRXs can be allocated to at most 5 sites.

SYNCTCH0 TCH1 TCH2 TCH3TCH4 TCH5 TCH6 TCH7 RSL0 RSL1


OML0

TRX0TRX1

OML2OML1

OML3OML4OML5

TRX2

TRX4

TRX6

TRX8

TRX3

TRX5

TRX7

TRX9


Chain Networking (15:1 Multiplex Mode)

For 2 E1 Port Multiplex /Port, one E1 can support a maximum of 15 TRXs.


BS&Abis Timeslot Mapping for 15:1 Multiplexing HW

TS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7 0 1T1 2T1 3T11 1T2 2T2 3T22 1T3 2T3 3T33 1T4 2T4 3T44 1T5 2T5 3T55 1T6 2T6 3T66 1T7 2T7 3T77 1T8 2T8 3T88 1T9 2T9 3T99 1T10 2T10 3T1010 1T11 2T11 3T1111 1T12 2T12 3T12 12 1T13 2T13 3T13 RSL11,12,13,1413 1T14 2T14 3T14 RSL7,8,9,1014 1T15 2T15 3T15 RSL3,4,5,615 1T16 2T16 3T16 OML+RSL0,1,216 1T17 2T17 3T17 4T1717 1T18 2T18 3T18 4T1818 1T19 2T19 3T19 4T1919 1T20 2T20 3T20 4T2020 1T21 2T21 3T21 4T2121 1T22 2T22 3T22 4T2222 1T23 2T23 3T23 4T2323 1T24 2T24 3T24 4T2424 1T25 2T25 3T25 4T2525 1T26 2T26 3T26 4T2626 1T27 2T27 3T27 4T2727 1T28 2T28 3T28 4T2828 1T29 2T29 3T2929 1T30 2T30 3T3030 1T31 2T31 3T3131 1T32 2T32 3T32

No.1 HW No.2 HW No.3 HW No.4 HW E1 0 1 2 3 4 5 6 70 SYNC1 1T1 1T2 1T3 1T4 2 1T5 1T6 1T7 1T8 3 1T9 1T10 1T11 1T124 1T13 1T14 1T15 1T165 1T17 1T18 1T19 1T206 1T21 1T22 1T23 1T247 1T25 1T26 1T27 1T288 1T29 1T30 1T31 1T329 2T1 2T2 2T3 2T4 10 2T5 2T6 2T7 2T8 11 2T9 2T10 2T11 2T1212 2T13 2T14 2T15 2T1613 2T17 2T18 2T19 2T2014 2T21 2T22 2T23 2T2415 2T25 2T26 2T27 2T2816 2T29 2T30 2T31 2T3217 3T1 3T2 3T3 3T4 18 3T5 3T6 3T7 3T8 19 3T9 3T10 3T11 3T1220 3T13 3T14 3T15 3T1621 3T17 3T18 3T19 3T2022 3T21 3T22 3T23 3T2423 3T25 3T26 3T27 3T2824 3T29 3T30 3T31 3T3225 4T17 4T18 4T19 4T2026 4T21 4T22 4T23 4T2427 4T25 4T26 4T27 4T28282930 RSL 3, RSL4, RSL5, RSL631 OML+RSL0, RSL1, RSL2

RSL 11, RSL12, RSL13, RSL14RSL 7, RSL8, RSL9, RSL10



Star networking








Ring networking





Sim 12:1

Sim 10:1



Start cascading


Logical BS1&Abis Timeslot Distribution for Star Cascading (2 S1/1/1 sites per port)

E1 0 1 2 3 4 5 6 70 1 T0C0 T0C1 T0C2 T0C3 2 T0C4 T0C5 T0C6 T0C7 3 4 T1C0 T1C1 T1C2 T1C3 5 T1C4 T1C5 T1C6 T1C7 6 7 T2C0 T2C1 T2C2 T2C3 8 T2C4 T2C5 T2C6 T2C7 9 10 T3C0 T3C1 T3C2 T3C3 11 T3C4 T3C5 T3C6 T3C7 12 13 T4C0 T4C1 T4C2 T4C3 14 T4C4 T4C5 T4C6 T4C7 15 16 T5C0 T5C1 T5C2 T5C3 17 T5C4 T5C5 T5C6 T5C7 18 19 idle2021 .22 .23 .24 .25 .26 .27 .28 .29 .30 idle31

SYNC

OML1+RSL3,4,5

.

.

OML0+RSL0,1,2

HWTS 0 1 2~7 0 1 2~7 0 1 2~7 0 ~ 7

0 S0T0C0 S0T4C0 S1T2C0 S0OML1+RSL3,4,51 S0T0C1 S0T4C1 S1T2C1 2 S0T0C2 S0T4C2 S1T2C2 3 S0T0C3 S0T4C3 S1T2C3 4 S0T0C4 S0T4C4 S1T2C4 5 S0T0C5 S0T4C5 S1T2C5 6 S0T0C6 S0T4C6 S1T2C6 S1OML1+RSL3,4,57 S0T0C7 S0T4C7 S1T2C7 8 S0T1C0 S0T5C0 S1T3C0 9 S0T1C1 S0T5C1 S1T3C1 10 S0T1C2 S0T5C2 S1T3C2 11 S0T1C3 S0T5C3 S1T3C3 12 S0T1C4 S0T5C4 S1T3C4 13 S0T1C5 S0T5C5 S1T3C5 14 S0T1C6 S0T5C6 S1T3C6 15 S0T1C7 S0T5C7 S1T3C716 S0T2C0 S1T0C0 S1T4C017 S0T2C1 S1T0C1 S1T4C118 S0T2C2 S1T0C2 S1T4C219 S0T2C3 S1T0C3 S1T4C320 S0T2C4 S1T0C4 S1T4C421 S0T2C5 S1T0C5 S1T4C522 S0T2C6 S1T0C6 S1T4C623 S0T2C7 S1T0C7 S1T4C724 S0T3C0 S1T1C0 S1T5C025 S0T3C1 S1T1C1 S1T5C126 S0T3C2 S1T1C2 S1T5C227 S0T3C3 S1T1C3 S1T5C328 S0T3C4 S1T1C4 S1T5C429 S0T3C5 S1T1C5 S1T5C5 S1OML0+RSL0,1,230 S0T3C6 S1T1C6 S1T5C631 S0T3C7 S1T1C7 S1T5C7 S0OML0+RSL0,1,2




Star networking








Ring networking





Sim 12:1

Sim 10:1



Simulate Chain Networking

When is simulate chain logic needed?

Because GM42BIE1 board of BTS2X does not support 15:1 chain networking, simulate 10:1 chain logic must be used when necessary.

BIE must be enabled to simulate 12:1 chain logic when the following conditions are simultaneously satisfied :

BSC uses GM32/34BIE;

The BTS type is BTS2X;

GM42BIE is used as the interface board of BTS;

(Sim 10:1) one port of BIE needs to bear more than 6 and no more than 10 carriers;

(Sim 12:1) one port of BIE1 needs to bear 11 or 12 carrier.


Simulate Chain Networking

Supported trunk networking modes

Sim 10:1

Sim 12:1


BS1&Abis Timeslot Distribution for Simulate 10:1 Chain LogicE1 0,1 2,3 4,5 6,7

0 SYNC1 T0C0 T0C1 T0C2 T0C32 T0C4 T0C5 T0C6 T0C73 T1C0 T1C1 T1C2 T1C34 T1C4 T1C5 T1C6 T1C75 T2C0 T2C1 T2C2 T2C36 T2C4 T2C5 T2C6 T2C77 T3C0 T3C1 T3C2 T3C38 T3C4 T3C5 T3C6 T3C79 T4C0 T4C1 T4C2 T4C3

10 T4C4 T4C5 T4C6 T4C711 T5C0 T5C1 T5C2 T5C312 T5C4 T5C5 T5C6 T5C713 T6C0 T6C1 T6C2 T6C314 T6C4 T6C5 T6C6 T6C715 T7C0 T7C1 T7C2 T7C316 T7C4 T7C5 T7C6 T7C717 T8C0 T8C1 T8C2 T8C318 T8C4 T8C5 T8C6 T8C719 T9C0 T9C1 T9C2 T9C320 T9C4 T9C5 T9C6 T9C7212223 RSL7

24 RSL625 RSL5

26 RSL4

27 RSL3

2829 RSL130 RSL0

31 OML

HW NO.1 HWTS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7

0 S0T0C0 S0T4C0 S0T8C0 1 S0T0C1 S0T4C1 S0T8C1 2 S0T0C2 S0T4C2 S0T8C2 3 S0T0C3 S0T4C3 S0T8C3 4 S0T0C4 S0T4C4 S0T8C4 5 S0T0C5 S0T4C5 S0T8C5 RSL96 S0T0C6 S0T4C6 S0T8C6 RSL87 S0T0C7 S0T4C7 S0T8C7 RSL78 S0T1C0 S0T5C0 S0T9C0 RSL69 S0T1C1 S0T5C1 S0T9C1 RSL510 S0T1C2 S0T5C2 S0T9C2 RSL411 S0T1C3 S0T5C3 S0T9C3 RSL312 S0T1C4 S0T5C4 S0T9C4 RSL213 S0T1C5 S0T5C5 S0T9C5 RSL114 S0T1C6 S0T5C6 S0T9C6 RSL015 S0T1C7 S0T5C7 S0T9C7 OML16 S0T2C0 S0T6C0 17 S0T2C1 S0T6C1 18 S0T2C2 S0T6C2 19 S0T2C3 S0T6C3 20 S0T2C4 S0T6C4 21 S0T2C5 S0T6C5 22 S0T2C6 S0T6C6 23 S0T2C7 S0T6C7 24 S0T3C0 S0T7C0 25 S0T3C1 S0T7C1 26 S0T3C2 S0T7C2 27 S0T3C3 S0T7C3 28 S0T3C4 S0T7C4 29 S0T3C5 S0T7C5 30 S0T3C6 S0T7C6 31 S0T3C7 S0T7C7

NO.2 HW NO.3 HW NO.4 HW

RSL9RSL8

RSL2


BS1&Abis Timeslot Distribution for Simulate 12:1 Chain Logic0 1 2 3 4 5 6 7

0 SYNC

1 T0C0 T0C1 T0C2 T0C32 T0C4 T0C5 T0C6 T0C73 T1C0 T1C1 T1C2 T1C34 T1C4 T1C5 T1C6 T1C75 T2C0 T2C1 T2C2 T2C36 T2C4 T2C5 T2C6 T2C77 T3C0 T3C1 T3C2 T3C38 T3C4 T3C5 T3C6 T3C79 T4C0 T4C1 T4C2 T4C3

10 T4C4 T4C5 T4C6 T4C711 T5C0 T5C1 T5C2 T5C312 T5C4 T5C5 T5C6 T5C713 T6C0 T6C1 T6C2 T6C314 T6C4 T6C5 T6C6 T6C715 T7C0 T7C1 T7C2 T7C316 T7C4 T7C5 T7C6 T7C717 T8C0 T8C1 T8C2 T8C318 T8C4 T8C5 T8C6 T8C719 T9C0 T9C1 T9C2 T9C320 T9C4 T9C5 T9C6 T9C721 T10C0 T10C1 T10C2 T10C322 T10C4 T10C5 T10C6 T10C723 T11C0 T11C1 T11C2 T11C324 T11C4 T11C5 T11C6 T11C725 RSL10+RSL1126 RSL8+RSL927 RSL6+RSL7

28 RSL4+RSL5293031 OML

RSL2+RSL3

RSL0+RSL1

E1HW No.1 HWTS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7

0 S0T0C0 S0T4C0 S0T8C0 1 S0T0C1 S0T4C1 S0T8C1 2 S0T0C2 S0T4C2 S0T8C2 3 S0T0C3 S0T4C3 S0T8C3 4 S0T0C4 S0T4C4 S0T8C4 5 S0T0C5 S0T4C5 S0T8C5 6 S0T0C6 S0T4C6 S0T8C6 7 S0T0C7 S0T4C7 S0T8C7 8 S0T1C0 S0T5C0 S0T9C0 9 S0T1C1 S0T5C1 S0T9C1 RSL10+RSL1110 S0T1C2 S0T5C2 S0T9C2 RSL8+RSL911 S0T1C3 S0T5C3 S0T9C3 RSL6+RSL712 S0T1C4 S0T5C4 S0T9C4 RSL4+RSL513 S0T1C5 S0T5C5 S0T9C5 RSL2+RSL314 S0T1C6 S0T5C6 S0T9C6 RSL0+RSL115 S0T1C7 S0T5C7 S0T9C7 OML16 S0T2C0 S0T6C0 S0T10C0 17 S0T2C1 S0T6C1 S0T10C1 18 S0T2C2 S0T6C2 S0T10C2 19 S0T2C3 S0T6C3 S0T10C3 20 S0T2C4 S0T6C4 S0T10C4 21 S0T2C5 S0T6C5 S0T10C5 22 S0T2C6 S0T6C6 S0T10C6 23 S0T2C7 S0T6C7 S0T10C7 24 S0T3C0 S0T7C0 S0T11C0 25 S0T3C1 S0T7C1 S0T11C1 26 S0T3C2 S0T7C2 S0T11C2 27 S0T3C3 S0T7C3 S0T11C3 28 S0T3C4 S0T7C4 S0T11C4 29 S0T3C5 S0T7C5 S0T11C5 30 S0T3C6 S0T7C6 S0T11C6 31 S0T3C7 S0T7C7 S0T11C7

No.2 HW No.3 HW No.4 HW



Star networking








Ring networking





Sim 12:1

Sim 10:1



16K LAPD Signaling Link Functions and applications

In the case of 16K LAPD signaling links, signaling channels are also 16K. Therefore, TCHs and signaling channels can be multiplexed freely to save Abis timeslots, especially in satellite transmission mode.

Except of the satellite transmission, 16K LAPD signaling links are not recommended otherwise.

Hardware and software configuration

Software

− BSC host software

− LAPD board software

− BTS software (BTS3X, BTS3001C, BTS3002C)

− OMC software

Hardware

− BIE: 34BIE


16K LAPD Signaling Link Supported trunk networking modes

6 E1 ports supporting 16K signaling links

4 E1 ports supporting 16K signaling links

Constraints

Incapable of time division multiplex mode of OML and RSL in a same 16K link.

Incapable of 16k links under 15:1 multiplexing or ring networking.

For data configuration, the OML of the BTS connecting with the BSC must be configured in the last 16k sub-timeslot of timeslot 31 of the Abis interface.

16k signaling links are forbidden in a half rate cell.


Comparison between 64K and 16K LAPD Signaling Links

1 TRX configured to 1BCCH+1SDCCH+6TRX

Timeslot Number

0 1 2 3 4 5 6 7

0 SYNC

1 TCH1 TCH2 TCH3 TCH4

2 TCH5 TCH6

…31 OML+RSL

Timeslot Number

0 1 2 3 4 5 6 7

0 SYNC

1 TCH1 TCH2 TCH3 TCH4

2

…31 TCH5 TCH6 RSL OML

64K LASD signaling link 16K LASD signaling link


Satellite Transmission Functions Satellite transmission means the communication through satellite to realize link

transmission between different entities.

Satellite communication is a kind of communicate between two or more earth stations via microwave signals, using the earth satellite as a relay station. Satellite transmission is a special form of microwave transmission.

Widely applied in remote mountainous areas and scarcely populated plains

Advantages: break through the limitation of landforms and distances; enable wide coverage, long transmission, low line cost, and flexible link transfer.

Weaknesses: long delay, jitter and bit error are the major problems need to be solved for entities of satellite transmission.

− The one-way delay of satellite transmission is about 270ms, and the two-way delay (one jump) is about 540ms. This delay mainly comes from the time taken for transmission of microwave signals in space.


Features of Huawei BSS Satellite Transmission Huawei BSS uses specialized satellite transmission equipment to address the c

haracteristics of satellite transmission and solves the problem related to satellite transmission.

Huawei BSS supports satellite transmission simultaneously at multiple ports, including A interface, Asub interface, Abis interface and Pb interface. Among them, Abis satellite transmission is widely applied, which usually adopts star networking.

All Huawei BSS software version can supports satellite transmission, but need license.

Application examples

Early in 2000, Abis satellite transmission was realized in Inner Mongolia. Now, Huawei BTS that adopts satellite transmission at the Abis interface is applied worldwide.

At the end of 2003, India operator-EXCELCOM opened PCU in the city of Menado which proved that Huawei PCU supported satellite transmission at the Gb interface.


Satellite Transmission Technologies A satellite transmission system usually consists of communication satellite

s and earth stations. Communication satellites are usually geosynchronous satellites. A satellite is composed of

the control system, pass system (antennas and relays), remote detection system, power supply system, and temperature control system.

An earth station is made up of the antenna system, transmitter, receiver, channel terminal equipment (modem), communication controller and power supply system.

− The earth station of normal satellite communication is a large international or European standard communication station, which features high transmission rate, large antenna aperture, and high equipment cost. User data are sent to the earth station over the ground communication network.

− VSAT (Very Small Aperture Terminal) users form a private network and communicate by way of the satellite. VSAT features low equipment cost, small antenna aperture, and ease of use. The Abis interface of a GSM system requires 2Mbps bandwidth, and therefore GSM satellite transmission usually adopts small-aperture VSAT.


Typical Satellite Transmission Networking

Satellite

Satellite earth station

Ground receiving station

Ground receiving station

SDH/PDH/Microwave/electrical cables


Notes for Abis Satellite Transmission

Configure more SDCCHs for BTS.

Consider allocating independent location areas for a BTS of satellite transmission.

BTS works in the internal clock mode.

Enable immediate provisioning optimization for BSC (please refer to the next page).

Increase the maximum number of retransmissions of MS.

Increase timeslots for extended transmission.

Save Abis interface resources.

Voice quality.


Signaling Flow for Immediate Provisioning Optimization


Notes for GPRS Cell of Abis Satellite Transmission

One more sattrans tables need to be configured at the PCU side for the satel

lite transmission in GPRS cell.

Routing areas should be allocated independently at the PCU side.

Because GPRS also has the pressure of downlink paging traffic, when lo

cation areas for satellite transmission cells are allocated independently a

t the BSC side and the MSC side, independent routing area allocation sh

ould also be carried out at the PCU side.


Notes for Satellite Transmission over Asub Interface The Asub interface must not be connected to the satellite modem via a data compression device.

It must be connected directly to the satellite modem. As such, a port normally uses 32x64k=2M bandwidth.

In practice, due to the constraint of bandwidth, it may not be possible to transmit all timeslots of the Asub interface. Usually, only part of timeslots are selected for transmission. When the required number of CICs and the number of configured FTC boards are determined, the number of timeslots needed for transmission can be calculated as follows:

number of transmission TSs = number of CICs/number of configured FTC boards For example: 32 CICs are available. If 1 FTC board is configured, all 32 TSs need be conne

cted to the satellite.If 2 FTC boards are configured, then 16 TSs. If 4 FTC boards are configured, only 8 TSs

Like the A interface, the timeslot configured with SS7 signaling must be transmitted. Timeslot 31 of the last FTC board in each TCSM unit used as maintenance link must also be transmitted.

Note: In practice, Asub satellite transmission is not recommended. Circuits corresponding to the ti

meslots used to non-satellite transmission must be manually blocked at the BSC side. Otherwise, because the normal E1 connection between FTC board in BSC and the DTM board in MSC, the MSC will think that all circuits corresponding to the CICs are idle. If such a circuit is provisioned, a call will be connected without any voice.


Notes for Satellite Transmission over A interface

According to the protocol, the A interface is the E1 interface between FTC board at the BSC side to DTM board at the MSC side. It complies with the principle that voice can be compressed and signaling cannot be compressed.

In view of the limitation of satellite resources, for A interface, voice signals are transmitted to the satellite modem after being compressed.

The engineer dealing with data compression must be told clearly which timeslots are for signaling, because signaling must be transmitted transparently without compression.

Satellite modem also adopts synchronization in timeslot 0 .

For example: the A interface of Huawei equipment, one TCSM unit includes 4 FTC boards, each providing one E1 to MSC. Timeslot 0 and the timeslot for SS7 signaling do not allow compression. Timeslot 31 of the E1 of the 4th FTC carries maintenance signaling and does not allow compression either.


Notes for Satellite Transmission over Gb Interface

Check whether a data compression device is present.

Unlike the voice channel in A interface, only data packets allowing no e

rror bits are transmitted via Gb interface. To avoid error bits resulting fr

om compression, so Gb interface does not allow data compression.

When satellite transmission is applied for the Gb interface, while ground tr

ansmission for the Abis interface, a sattrans table need not be configured

at the PCU side. The data configuration of Gb interface for satellite transm

ission is the same as that for ground transmission.


Initial Data Configuration for Abis Satellite Transmission

Step 1. Add basic data like new BTSs and cells.

Step 2. Select the corresponding site, select BTS Property and modify Transmission Mode and Clock Mode.



Step 3. Click TRX Property > Channel Property, and configure more SDCCHs than usual. This is because, in satellite transmission, the MS will normally resend channel requests.



Step 4. Click Default Data > Call Control. The system enables Immediate Provisioning Optimization by default.

Step 5. Click System Information and set MS MAX Retrans and TX-integer.


Dynamic Data Configuration for Abis Satellite Transmission

Procedure to add a new BTS supporting satellite transmission

Select Set Site Dynamically > Add a BTS, and the modification to related data will be completed.

Procedure to change a normal BTS to a BTS supporting satellite transmission

Step 1. Modify Clock Mode and Transmission Mode by selecting Set Site Dynamically > Modify Site Properties.

Step 2. Modify Channel Properties by selecting Set Site Dynamically > Modify Channel Type.

Step 3. Modify immediate provisioning optimization by selecting Set Site Dynamically > Modify Cell Call Processing Parameters.

Step 4. Modify MS Maximum Retransmissions and Extended Transmission Timeslots by selecting Set Site Dynamically > Modify Cell System Information.


Initial Data Configuration for A-interface Satellite Transmission

Click Module[0] in object list, select double click E3M board in Hardware tab, and double click the digital number, for example 4, corresponding to Signaling Link, to open the Signaling Link Property dialog box. Select Satellite Circuit Identification.

Double click


Initial Data Configuration for Pb-interface Satellite Transmission Select E3M under Hardware and Double click the blank area corresponding to the

Signaling Link to open the SET E3M Board PB Circuit Property dialog box. Modify Transmission Mode to Satellite Transmission.

Double click


Dynamic Data Configuration for A/Pb interface Satellite Transmission

Dynamic Data Configuration for A interface Satellite Transmission

Select BSC > Configure SS7 Property.

Dynamic Data Configuration for Pb interface Satellite Transmission

Select BSC > Modify Pb Interface Property.







Star networking









Ring networking





Sim 12:1

Sim 10:1



BTS BTS BTS

BTS BTS BTS BTSBSC

Ring Networking

BTS

Ring networking adds a reverse OML based on chain networking. When the forward OML breaks, one ring automatically changes to two chains. The system reliability is largely enhanced.


Various Ring Connections In Figure a, sites 0, 1 and 2 form a r

ing and they are all ring BTSs. Site 3 and 4 form a chain network.

In Figure b, sites 0, 1 and 2 form a ring and they are all ring BTSs. Site 3, 4 and ring form a double chain, and site 3,4 are regarded as bypass BTSs.

Figure c is similar to Figure b. The difference is that the double chain crosses two BIEs.

In Figure d, sites 0, 1, 2 and 3 form a ring. Sites 0, 1 and 2 are ring BTSs, and site 3 is bypass BTS.


Basic Concepts of Ring Networking By the transmission direction of a BTS in a chain, links are divided into forward link

and reverse link.

Forward ring link

The forward link begins from the forward port of BSC BIE. In normal condition (all BTSs establish link in the forward link), all the BTSs run in the forward link.

Reverse link

The reverse link begins from the reverse port of BSC BIE. In normal condition, there is no BTS in the reverse link. The reverse link serves as only a transmission link.

In the ring networking mode, the E1 connecting to BIE port 0 is the forward link. The E1 connecting to BIE port 1 is the reverse link. The E1 connecting to BIE port 2 and port 3 are Bypass links.


Basic Concepts of Ring Networking

BSC treats the bypass sites and the sites in the ring network equally. The link setup of bypass sites is as follows:

When site1 sets up link in the forward link, site1 sets up forward link transparent transmission relationship for site3 after site1 is initiated. Then, site3 sets up link in the forward link through site1.

When site1 sets up link in the reverse link, site1 sets up reverse link transparent transmission relationship for site3 after site1 is initiated. Then, site3 sets up link in the reverse link through site1.

The Bypass BTS

It is the BTS that is not in the ring network but is cascaded connected to a BTS in the ring network, as shown in right Figure: Site3 is a Bypass BTS.


Ring Networking

Software and hardware version

Software

− All the software version supports both BSC and BTS3X.

− BTS22C, BTS3002C and BTS3001C do not support ring networking .

Hardware

− 34BIE board


Connection Method of Ring Networking Mode

Procedure of physical connection:

Connect multiple BTSs in a chain according to the chain networking mode.

Connect the last BTS in the chain to the BSC BIE to form a ring.

Comparison between ring networking and chain networking:

The ring networking mode has two links. The BTSs can decide to use which one by the actual situation.

In ring networking, a BIE can provide 6 E1 ports, so one BIE can support 3 rings. while in15:1 chain networking, one BIE can only provide 2 E1 ports, two single chains or one double chain.


Functional Overview of Ring Networking Under the ring networking mode, the BTSs can establish link in the forward

link or in the reverse link. The E1 timeslots that the BTSs occupy in the forward link are different from that in the reverse link. Therefore, BSC reestablishes the switching relationship between E1 timeslot and HW timeslot when the BTSs establish link. .

BSC configures two sets of data for each BTS on the ring.

One set is for the forward link. Another is for the reverse link.

The two sets specify the timeslot switching relationship between various links of BTS and the traffic channel.

The auto configuration console calculates the data configuration for the reverse link. This data is not total new but is modified from the data for the forward link. The auto configuration console adds the data related to the reverse link on the basis of the original data for the forward link.


Mapping between HWs and E1 Timeslots for Ring Networking

Port 0 and port 1 of the BIE form a full rate ring network and connect five BTSs, namely sites 0 to site 4.

Each BTS has two TRXs.

Channel 0 of TRX 0 is the BCCH and channel 1 is SDCCH8.

Other channels of TRX 0 and all channels of TRX 1 are set to “TCH full rate”.

Site 3 is a Bypass site and the other sites are ring sites. The forward ring port is port 0 of BIE and reverse ring port is port 1 of BIE. The upper level port of site 3 is port 2.

0

1

Site0 Site1

Site3

Site2

Site4


Mapping between HWs and E1 Timeslots for Ring Networking

E1 0,1 2,3 4,5 6,70 SYNC1 S0T0C2 S0T0C3 S0T0C4 S0T0C52 S0T0C6 S0T0C7 S0T1C0 S0T1C13 S0T1C2 S0T1C3 S0T1C4 S0T1C54 S0T1C6 S0T1C75 S1T0C2 S1T0C3 S1T0C4 S1T0C56 S1T0C6 S1T0C7 S1T1C0 S1T1C17 S1T1C2 S1T1C3 S1T1C4 S1T1C58 S1T1C6 S1T1C79 S2T0C2 S2T0C3 S2T0C4 S2T0C5

10 S2T0C6 S2T0C7 S2T1C0 S2T1C111 S2T1C2 S2T1C3 S2T1C4 S2T1C512 S2T1C6 S2T1C713 S3T0C2 S3T0C3 S3T0C4 S3T0C514 S3T0C6 S3T0C7 S3T1C0 S3T1C115 S3T1C2 S3T1C3 S3T1C4 S3T1C516 S3T1C6 S3T1C717 S4T0C2 S4T0C3 S4T0C4 S4T0C518 S4T0C6 S4T0C7 S4T1C0 S4T1C119 S4T1C2 S4T1C3 S4T1C4 S4T1C520 S4T1C6 S4T1C7212223 S3RSL0/RSL1

24 S2RSL0/RSL1

25 S1RSL0/RSL1

26 SORSL0/RSL1

27 FOML4

2829 FOML2

30 FOML1

31 FOML0

S4RSL0/RSL1

FOML3

HW NO.1 HWTS 0 1 2 ～ 7 0 1 2 ～ 7 0 1 2 ～ 7 0 ～ 7 0 S0T0C2 S2T0C6 S4T1C2 1 S0T0C3 S2T0C7 S4T1C3 2 S0T0C4 S2T1C0 S4T1C4 3 S0T0C5 S2T1C1 S4T1C5 4 S0T0C6 S2T1C2 S4T1C6 5 S0T0C7 S2T1C3 S4T1C7 6 S0T1C0 S2T1C4 7 S0T1C1 S2T1C5 8 S0T1C2 S2T1C6 9 S0T1C3 S2T1C7 10 S0T1C4 S3T0C2 11 S0T1C5 S3T0C3 12 S0T1C6 S3T0C4 13 S0T1C7 S3T0C5 14 S1T0C2 S3T0C6 15 S1T0C3 S3T0C7 16 S1T0C4 S3T1C0 17 S1T0C5 S3T1C1 18 S1T0C6 S3T1C2 19 S1T0C7 S3T1C3 20 S1T1C0 S3T1C4 21 S1T1C1 S3T1C5 22 S1T1C2 S3T1C6 23 S1T1C3 S3T1C7 24 S1T1C4 S4T0C2 25 S1T1C5 S4T0C3 26 S1T1C6 S4T0C4 27 S1T1C7 S4T0C5 28 S2T0C2 S4T0C6 29 S2T0C3 S4T0C7 30 S2T0C4 S4T1C0 31 S2T0C5 S4T1C1

NO.2 HW NO.3 HW NO.4 HW

S0RSL0/RSL1

BOML4

FOML4

BOML3

FOML3

BOML2

FOML2

BOML1

FOML1

BOML0

FOML0

S1RSL0/RSL1

S2RSL0/RSL1

S3RSL0/RSL1

S4RSL0/RSL1

E1 0,1 2,3 4,5 6,70 SYNC1 S0T0C2 S0T0C3 S0T0C4 S0T0C52 S0T0C6 S0T0C7 S0T1C0 S0T1C13 S0T1C2 S0T1C3 S0T1C4 S0T1C54 S0T1C6 S0T1C75 S1T0C2 S1T0C3 S1T0C4 S1T0C56 S1T0C6 S1T0C7 S1T1C0 S1T1C17 S1T1C2 S1T1C3 S1T1C4 S1T1C58 S1T1C6 S1T1C79 S2T0C2 S2T0C3 S2T0C4 S2T0C5

10 S2T0C6 S2T0C7 S2T1C0 S2T1C111 S2T1C2 S2T1C3 S2T1C4 S2T1C512 S2T1C6 S2T1C713 S3T0C2 S3T0C3 S3T0C4 S3T0C514 S3T0C6 S3T0C7 S3T1C0 S3T1C115 S3T1C2 S3T1C3 S3T1C4 S3T1C516 S3T1C6 S3T1C717 S4T0C2 S4T0C3 S4T0C4 S4T0C518 S4T0C6 S4T0C7 S4T1C0 S4T1C119 S4T1C2 S4T1C3 S4T1C4 S4T1C520 S4T1C6 S4T1C7212223 S3RSL0/RSL1

24 S2RSL0/RSL1

25 S1RSL0/RSL1

26 SORSL0/RSL1

27 BOML3

2829 BOML1

30 BOML2

31 BOML4

S4RSL0/RSL1

BOML0


Ring Networking

Supported trunk networking modes

Full rate ring topology

Half rate ring topology

Differences between the two modes:

In a full rate ring, the multiplexing ratio of RSL signaling is 4:1, while in a half rate ring, this ratio is 2:1.

Half rate ring networking needs to reserve some HW timeslots.


Data Configuration for Ring Networking

Step 1. In Set BIE Property, select Full Rate Ring Topology or Half Rate Ring Topology.

Step 2. Add N sites in the same way as adding a site in normal chain networking. To add a tributary BTS to site 1, select Site 1, click the button Configure Site and select to add a new BTS in the popup dialog box.


Data Configuration for Ring Networking

Step 3. Set the ring identifiers. Select Site 2 and click the button Add Topology Mark.

Step 4. Add a cell and allocate carriers, configure frequencies and configure the cell for each site.


Data Configuration for Ring Networking Step 5. Set the ring network

parameters of each site in the ring. For example, to set the ring network parameters of site 1, select Site 1 in page Site Device and click Site Equipment Properties. In the popup dialog box, select the Ring Topology Property tab.

To judge whether transmission is interrupted before link establishment

Indicate whether the BTS is a allowed to do automatic switchover when

transmission is interrupted.

After a switchover, the BTS will attempt to build the link at port 0 or port 1 continuously. If the attempt does succceed after the set Switchover Attempt Time ellapses, the BTS will change to attempt building a link

at another port.


Query Ring network parameters Select the intended site at the maintenance console of the BTS, doubl

e click on Ring Topology Parameters Query and the query result is displayed.

The query result shows that the site currently builds its link in the forward ring. If you want to continue the query, you can click Query.


Manual Switchover for a Ring Network In a ring network, the link direction ca

n be change through Third Level Reset. For Fourth Level Reset, Reset Port is unavailable.

In the popup Site Reset Hierarchically window, select Third Level Reset. Port 0: building link in the forwar

d ring.

Port 1: building link in the reverse ring.

Not Select: The BTS will attempt to build a link at the port of the previous link in preference.


Tree Networking Tree networking is an extension of chain

networking BTSBTS

BTSBTS

BTS

BTS

BTS BTSBSC

BTS


Tree Networking

Tree networking connects more than two lower level sites under an upper level site. It is an extension of chain networking.

Another form of tree networking is star cascading. Two BIE trunk networking modes support star cascading:





Star networking









Ring networking





Sim 12:1

Sim 10:1



Overview of Half Rate

The half rate voice service uses a new voice coding algorithm to reduce the voice coding rate to half that of full rate voice service. Thus, one physical channel that can only support one call under the full rate can support two calls under half rate.

If the half rate service is used, the voice capacity expands twice without adding TRXs. By adopting half rate service, the operator can fully use the current network to expand the system capacity. This saves the cost and eases the spectrum use.


Half Rate Configuration The half rate service function is authorized by license.

BSC software

Half rate enabled BSC host version, and LAPD version

Hardware Boards

BIE: GM34BIE

FTC: (refer to the table)

BTS software

BTS3X 、 BTS3002C 、 BTS3001C

NameBoard software version

queried at the maintenance console

Supported service type

13FTC0 FTC 3.0 1999.09.28 FR/EFR

13FTC1 FTC 3.2 2002.11.18 HR/FR

13FTC2 FTC 3.2 2003.09.02 HR/FR

13FTC3 FTC 3.2 2003.11.12 HR/FR

14FTC0 FTC 4.0 2003.11.21 FR/EFR/HR

14FTC0 FTC 4.2 2005.04.30 FR/EFR/HR/AMR


Allocation of Half Rate Related Resources Allocation of HW Resources

One OML and one RSL share one HW timeslot. Or, Two RSL share one HW timeslot. (The OML and RSL of different sites cannot be multiplexed. The RSLs of different sites cannot be multiplexed. )

A traffic channel occupies two HW timeslots.

The signaling channel such as BCCH and SDCCH are not assigned with any HW timeslot.

Allocation of E1 Resources

when multiplexed, one OML and one RSL share one E1 timeslot or two RSLs share one E1 timeslot.

One half rate traffic channel uses 1/8 E1 timeslot.

The signaling channels such as BCCH and SDCCH do not occupy any E1 timeslot.


Half Rate Capability of One BIE Suppose the number of TRXs that a BIE support is n, and then n must meet th

e following requirement: 2568221

cbnnaa: The number of OMLs ;b: The number of BCCHs or combined BCCHs ;

c: The number of SDCCH/8 or SDCCH+CBCH of all the cells configured to the BIE 8 x n: Each TRX includes 8 channels. When the half rate is used, it is recommended to configure one SDCCH to one TRX. 2 x (8 x n – b – c): The number of HW timeslots used by all TCHs configured on this BIE group (each TCH uses two HW timeslots.)256: The maximum number of HW timeslots a BIE group can offer (for a BIE providing only 4 HWs, this figure is 128.)

Suppose a BIE is configured with three BTSs (three cells) and each TRX is configured with one SDCCH, and then a = 1; b = 3; c = n.Put the value of a, b, c into above formula, you can get that n = 18 (one E1 cannot support 18 TRXs, you shall use two E1s).


Half Rate Capability of One E1 Method to calculate the number of TRXs an E1 supports

132841

21

cbnnaa: The number of OMLs;b: The number of BCCHs or combined BCCHs; c: The number of SDCCHs of all cells configured on this E1; ½ (a+n): The number of HW timeslot occupied by OML and RSL (round up);8 x n: Each TRX has 8 channels. n number of TRXs has 8 x n channels;¼(8xn-b-c): The number of E1 timeslot occupied by all the traffic channels configured to the E1 (round up). 32-1: The maximum number of E1 timeslot that an E1 has. The timeslot 0 of each E1 is used as synchronization timeslot fixedly.

Example:Suppose an E1 is configured with three BTSs (three cells) and each TRX is configured with one SDCCH, and then a = 1; b = 3; c = n. Put the value of a, b, c into above formula, you can get that n = 13.


Half Rate Capability of BM

The number of TRXs that a BM supports

When all channels of all the TRXs of a BM are configured as half rate channel, if one TRX is configured with one SDCCH, one BM can support 75 TRXs at most.

The number of the TRXs in a BM mainly depend on the bandwidth of the optical fiber between the BM and AM/CM.If one timeslot of a TRX is configured as SDCCH and other seven timeslots are configured as half rate TCH, then the number of the TRXs are 1024/(2*7)=73.1. Actually, one cell needs one BCCH, suppose that one cell is configured with five TRXs, then, the number of the TRXs in a BM can be 75.


Typical Examples of Site Configuration of Half Rate Networking S6/6/6 site configuration

Analysis

The total number of RSL and OML is 19. They occupy 10 HW time slots if using 2:1 multiplexing. The number of the rest HW time slots of BIE is 256–10=246. The number of SDCCH is 18, and of the number of BCCH is 3, so the number of HW slots needed by the traffic channel is 2× (8×18-3-18) =246, which equals to the number of the rest HW slots,

Conclusion

The site configurations above can use one BIE, but need two E1s to connect to the site (one E1 cannot support so many TRXs). As for how to choose the two E1s, any two of the six E1 of the BIE are ok.


Typical Examples of Site Configuration of Half Rate Networking S2/2/2+S4/4/4 site configuration

Analysis The total number of RSL and OML of S2/2/2 site configuration is 7. They

occupy four HW time slots if using 2:1 multiplexing. The total number of RSL and OML of S4/4/4 site configuration is 13. They occupy seven HW time slots if using 2:1 multiplexing. The number of the rest HW time slots of BIE is 256–11=245.

The number of SDCCH is 18, and the number of BCCH is 3+3=6, so the number of HW time slots required by the traffic channel is 2× (8×18–6–18) =240 which equals to the number of the rest HW time slots. These rest HW time slots can meet the requirements.

Conclusion The site configurations above can use one BIE. As for how to choose the two

E1s, any two of the six E1 of the BIE are ok.


Initial Data Configuration for Half Rate Networking

Step 1. Configure the half rate network of BIE and add cells.



Step 2. Enable half rate for the cell.



Step 3. Configure the half rate circuit pool.

13 FTCs

− To enable half rate service and set the circuit pool to 3.

− If half rate support need not be enabled, set the circuit pool to 1.

For 14 FTCs, to enable EFR and half rate service, set the circuit pool to 7.


Mapping between Circuit Pool Numbers and Voice Versions

Coding Circuit PoolSupported channels and speech coding

algorithmsNormal Status

0000 0001 Circuit pool number 1 FR speech version 1 FR data (12, 6, 3.6 kbit/s)

0000 0010 Circuit pool number 2 HR speech version 1 HR data (6, 3.6 kbit/s)

0000 0011 Circuit pool number 3FR speech version 1 FR data (12, 6, 3.6 kbit/s)HR speech version 1 HR data (6, 3.6 kbit/s)

0000 0100 Circuit pool number 4 FR speech version 2(EFR) FR data (12, 6, 3.6 kbit/s)

0000 0101 Circuit pool number 5FR speech version 1FR speech version 2(EFR) FR data (12, 6, 3.6 kbit/s)

0000 0110 Circuit pool number 6FR speech version 2(EFR) FR data (12, 6, 3.6 kbit/s)HR speech version 1 HR data (6, 3.6 kbit/s)

0000 0111 Circuit pool number 7

FR speech version 1FR speech version 2(EFR) FR data (12, 6, 3.6 kbit/s)HR speech version 1 HR data (6, 3.6 kbit/s)



Step 4. Set cell channel management related parameters.


Dynamic Data Configuration for Half Rate Networking

Step 1. To enable half rate for a cell

select Cell > Modify Cell System Information.

Step 2. To set a trunk circuit pool No

select BSC > Dynamic Configuration without Command Word > Trunk Circuit.

Step 3. To set cell channel management parameters

select Cell > Modify Cell Channel Management Parameter Step 4. To set channel type

select Cell > Modify Channel Type.


Query Half Rate Channels State


The principle and data configuration about

Star Topology

Chain Topology/ Tree Topology

Ring Topology

Half Rate Topology

SummarySummary

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OMD000410 Abis Interface Networking Topologies ISSUE 1.0.ppt

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