CDMA-P&O_I_04_200904 CDMA Optimization of Newly-added Base Station-8-ok

8/7/2019 CDMA-P&O_I_04_200904 CDMA Optimization of Newly-added Base Station-8-ok

1/6

CDMA Optimization of Newly-added Base Station


2/6

Contents

1 Optimization of Newly-added Base Station................................................................................................1

1.1 Confirming the Radio Parameters ...........................................................................................................1

1.2 Checking the Single Station ....................................................................................................................2

1.3 Optimizing the Network...........................................................................................................................3

i


3/6

1 Optimization of Newly-added BaseStation

Keypoints

Optimization of Newly-added Base Station

To an existing wireless network, a newly-added base station will bring certaininfluence to the whole system. In order to minimize such effect, it is necessary to

regulate the operating procedures of new sites building.

With respect of the lauch and optimization process of newly-added base station, it can

be divided into three stages: radio parameters confirming, single station checking

(changing the frequency and activating the station before the checking), and network

optimizing.

1.1 Confirming the Radio Parameters

Before the base station is launched, it needs to confirm part of radio parameters, to

avoid the network troubles caused by inreasonable initial parameter configuration;

meanwhile, check whether the parameters on the OMC background has been set in

accordance with the initial design;

Parameters needed to be checked mainly include: PN, neighbor list, critical cell and

preferred neighbor cell, bordering cell and candidate frequency (double carriers),

search window and cell radius, RFS ID and CI, and so on. The check is performed on

the OMC background; with the premise that the OMC has finished the data

configuration of newly-added base station and data adjustment of surrounding base

stations (mainly refer to the neighbor base stations; but no real implementation in

practice after adjusting). The detailed steps are as follows:

(1) PN checking: check whether the PN design satisfies the requirement of

avoiding PN confusion; note whether there exist problems in Pilot_Inc and pilot

multiplex. To a base station with far distance coverage, the PN of its neighbor

station can not be set continuously after its PN, the difference between their

1


4/6


PNs should be larger than 1.

(2) Configurng of neighbor list, critical cell, preferred neighbor cell, bordering celland candidate frequencies: on the basis of the network topology, check whether

the neighbor cell configuration of the newly-added station is reasonable;

whether the neighbor cells match each other; whether the configuration of the

critical cell is proper on the boundary from double-carrier cell to single-carrier

cell; whether the preferred neighbor cell configuration of the critical cell is

proper; whether the bordering cell and candidate frenquency configuration of

the double-carrier cell is reasonable.

(3) According to the new base stations coverage radius and whether it has a repeat,check whether the search window and the site radius is reasonable:

The search window size can be set on the basis of estimated transimission path.

The size of search window can normarlly not larger than 13. The site radius is

generally set to 128 or 256. In terms of the island site, the site radius can be set

to 384 or 472.

The urban site SRCH-WIN-A/SRCH-WIN-N/SRCH-WIN-R is often set to

6/8/8, and the site radius is generally set to 128.

In terms of the sites of wide coverage, which are located in urban or suburb

areas, their search windows can be properly enlarged.

In terms of the repeaters donor station, the three parameters of its search

window are required to be set largerly; for the base station adjoining the

repeater, SCR-WIN-N must be set to the values as similar as the ones of the

repeaters donor station.

(4) Setting of other parameters: for example, in case of single-carrier, it should be

set to 2/3/4, while in terms of double-carrier, it is set to 2/5, 3/6, or 4/7. If the

setting is wrong, it will produce problems like those due to wrong feeder

connection. The setting of parameters including CI, REG_ZONE, LAC, etc.,

must be correct.

1.2 Checking the Single Station

To guarantee the base station working properly, it needs to debug it before its running.

In terms of the island site, set the frequency to the value which is to be adopted

formally and then perform the debugging. In terms of non-island site, particularly the

2


5/6

Chapter 1 Optimization of Newly-added Base Station

newly-added station in the urban area, it needs to select another frequency before

debugging, and when the station can work normally change the frequency to the valule

which is adopted during work. The station enters the network formally.

The debugging of the base station can only be conducted in the condition that the

station has been activated. That is, the station constructing has finished, the power and

transmission has been ready, the antennas height, orientation angle and downtilt has

been set up in accordance with the designed values and the normal call can be made.

After the base station has been activated, the staff that is in charge of the activation

conduct the single station checking and sees whether it runs in a normal working state.

1.3 Optimizing the Network

For the island station, after finishing the debugging and single station checking, the

engineer who is in charge of the base station activation judges according to the real

situation whether the drive test should be performed on the base station. If there appear

any problems during drive test, slove these problems first, then the new base station

can be brought into the network.

In terms of the non-island station, after finishing the debugging of the base station,

change the frequency back to the systems normal working frequency, and the base

station can be allowed to enter the network, which should be done during the period

when the traffic is very small. The detailed steps for a non-island station before

entering the network is as follows:

(1) For a new station located in the urban area, drive test must be done after the

station is activated. For a new station in the suburb or other areas, whether

drive test is to be done or not depends on the actual network situation and

practical requirements. Make a detailed plan about the drive testing, with the

tested new station and its surrounding stations being included in the driving

route.

(2) When activating the newly-added base station, make its parameters and the

parameters of its surrounding stations (mainly those of its adjointing staions) to

accord with those which have been corrected on the OMC background.

(3) For the new station which needs drive testing, make the drive test immediately

after it is activated, confirming whether the call origination, call termination,

call release, soft handoff and softer handoff is normanl. According to the

3


6/6


handoff situation, notice the OMC background to adjust the neighbor list. In

terms of the case without drive testing, observe and make sure whether the

items mentioned above such as call origination, call termination, etc., are

normal through calling.

(4) Perform the drive test and observe on the OMC background to learn the status

of the call. If there exist any severe problems, close the new station and restore

the parameters of its surrounding stations. Reopen the new station after the

problems have been sloved.

(5) If the drive test data shows that the newly-added station has a relatively large

influence on the current network performance (for example, it affects the callcompletion, data rate, and so on), adjust the parameters (such as antenna

orientation, downtilt) of the new station and its surrounding stations.

(6) After conducting the adjustment of the new station and its surrounding stations

in engineering, repeat the test, until the problems have been resolved.

(7) During the week after the new station is activated, the OMC engineer must pay

a close attention to the handoff status of the new station, and adjust the

neighbor list according to the real situation when necessary.

(8) After one week, the OMC engineer submits the Report of New Stations

activating and Network-joining, presenting the running information of the base

station and its surrounding stations during the past week. As per planned

purposes and practical testing data, judge whether the new station can satisfy

the anticipation or not.

4

Documents

CDMA-P&O_I_04_200904 CDMA Optimization of Newly-added Base Station-8-ok