8.radio parameters

7/29/2019 8.Radio Parameters

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ZXG10Radio Parameters




Contents

• Network Identification Parameters CGI, BSIC )

• System Control Parameters RLT, CBA, CBQ,etc )

• Cell Selection Parameters ( C1, C2 )• Network Functional Parameters (INTAVE, LIMITn,

etc )




Network identification Parameters

• As a global cellular mobile communication system,the GSM strictly numbers each GSM network in each

country, or even numbers each location area, every

station or every cell in every network in order that

every cell around the globe has an solecorresponding number. This numbering mode aims to:




Roles of Network Identification Parameters

• Enable the MS to correctly identify the ID of thecurrent network so that it can correctly select the

network the user (or telecom operator) wants to

access to in any conditions.

• Enable the network to be real time informed of thecorrect geographical location of the MS so that the

network can normally connect various service

requests with the MS as the terminal.

• Enable the MS to report correctly the adjacent cellinformation during the conversation process so that

the network can hand-over the calls when necessary

to ensure the continuity of the conversation.




Cell Global Identity CGI

CILACMNC

LAI

CGI

MCC




Setting of CGI

• MCC resource is allocated and managed by ITU. TheMCC of China is 460（decimal).

• MNC is usually allocated by the relevant

telecommunication administration department of a

country.• The LAC encoding mode is specified correspondingly

by every country. Usually, the location area should be

as large as possible.

• Two or more cells in the same location area are notallowed to share the same CI.




BSIC(1)

• In GSM system, each BS is allocated with a localcolor code called base station identity code (BSIC). If,

in a physical location, one MS can receive the BCCH

TRX of two cells at the same time and their channel

numbers are the same, the MS will distinguish themby the BSIC.




BSIC(2)

BCC

BSIC

NCC

BSIC is composed of NCC(network color code) and

BCC(base station color code).

NCC ranges from 0～7. BCC ranges from 0～7.




NCC and BCC

In the connection mode (during conversation), the MS mustmeasure the signals in the adjacent cells and report the

result to the network. As each measurement report sent by

the MS can only contain the contents of six cells, so it is

necessary to control the MS so as to only report theinformation of cells factually related to the cell concerned.

The high 3 bits (i.e. NCC) in the BSIC serve this purpose.

The BCC is used to identify different BS using the same

BCCH in the same GSM PLMN.




BSIC Configuration Principle

CBA

FED

In general, it is required that Cells A, B, C, D, E and F use

different BSIC. When the BSIC resources are not enough,the cells close to each other may take the priority to usedifferent BSIC.




Roles of BSIC(1)

1. When MS receives the SCH, it is considered to havesynchronized with the cell. But in order to correctly

translate the information on the downlink common

signaling channel, the MS must be aware of the training

sequence code (TSC) used by the common signaling

channel. The TSC used by the common signalingchannel of each cell is determined by the BCC. So one

of the functions of the BSIC is to inform the MS the

TSC used by the common signaling channel of the cell.

2. As the BSIC takes part in the decoding process of therandom access channel (RACH), it can be used to

prevent the BS from mis-decoding the RACH, sent by

the MS to an adjacent cell, as the access channel of

this cell.




BSIC(2)

3. When the MS is in the connection mode (during

conversation), it must measure the BCCH level of

adjacent cells specified in adjacent cell tables

broadcasting by BCCH and report the results to the BS.

In the uplink measurement report, MS must show BSIC

of this carrier it has measured to every frequency point.In some special cases, i.e. two or more adjacent cells

in a cell use the same BCCH, the BS can distinguish

such cells by way of BSIC in order to avoid the wrong

handover or even the handover failure.




BA

When a MS is turned on, it will scan from the BA(Adjacent cell BCCH table) it remembered when turned

off last time. The MS will first search carriers from this

table and if none is found it will turns to find any of 30

carriers with highest levels, then try to decode BCCH

carriers one by one according to their level sequences.




Cell Selection

When the MS is turned on, it will try to contact a publicGSM PLMN, so the MS will select a proper cell and

extract from the cell the control channel parameters and

prerequisite system messages. This selection process is

called cell selection. The quality of radio channels is animportant factor in cell selection.

The GSM Specifications defines the path loss rule

C1.For the so-called proper cell, C1>0 must be ensured.




C1

C1 = RXLEV - RXLEV_ACCESS_MIN- Max(MS_TXPWR_MAX_CCH - P ,0)

where,RXLEV_ACCESS_MIN is the minimum received level the

MS is allowed to access the network MS_TXPWR_MAX_CCH is the maximum power level of

the control channel (when MS sending on RACH);

RXLEV is average received level;

P is the maximum TX power of MS;MAX（X, Y）＝X; if X Y.

MAX（X, Y）＝Y; if Y X.




Path loss Criterion

• All the candidate cells for MS must meet the pathloss criterion, i.e C1>0. MS will select the cell with the

maximal C1 to access and will camp on this cell

unless some key conditions has changed greatly.




RXLEV_ACCESS_MIN

In order to avoid providing unsatisfactory communicationquality and avoid the unnecessary waste of radio

resources if the MS accesses to the system (the

communication quality after the access often cannot

ensure the normal communication process) at the verylow received level, the GSM system regulates that, when

a MS is to access to a network, its receiving signal level

must be larger than a threshold level, i.e. the minimum

receiving level the MS is allowed to access to

（RXLEV_ACCESS_MIN).

Default value is 0 (-110dBm).




Cell Reselection

The necessity to make a cell reselection• Parameters regarding to cell reselection

PI

C2

Cell Selection Hysteresis

CRO TO and PT

CBA

CBQ




Definition

Cell reselection is a process MS change its

service cell in idle mode. When the MS selects acell and if there are not major changes in thevarious conditions, the MS will stay in theselected cell, and the MS will begin to measure

the signal levels of the BCCH TRX of its adjacentcells, record 6 adjacent cells whose signal levelsare the strongest and extract from them varioustypes of system messages and control messagesof each adjacent cell. When given conditions aremet, the MS will move from the current cell intoanother one. This process is called cellreselection.




C2 1

When PI indicates YES the MS will getparameters (CRO, TO and PT) , from BCCH, to beused to calculate C2(channel quality criterion),which serves as cell reselection norm. The

equation is as follows:

C2 C1 CRO H PT T TO, when PT 31

C2 C1 CRO , when PT 31

Where T is a timer. When a cell is recorded by MS as

one of the six strongest cells,timer starts counting,otherwise, T is reset to zero.




PI

• PI is used to notify the MS whether to use C2 as thecell reselect parameter and whether the parameters

calculating C2 exist.

• PI consists of 1 bit. “1”means the MS should extract

parameters from the system message broadcasting

in the cell to calculate the C2 value, and use the C2

value as the standard for cell reselect; “0” means the

MS should use parameter C1 as the standard for cellreselect (equivalent to C2＝C1）.




C2 2

• If the MS calculates that the C2 value of an adjacentcell (in the same location area with the current cell)

surpasses the C2 value of the cell where the MS

stays and maintains for 5s or longer, the MS will start

cell reselection and access to the adjacent cell. If the

MS detects a cell that is not in the same location areawith the current cell, the calculated C2 value

surpasses the sum of the C2 value of the current cell

and the cell selection hysteresis (CSH) parameter

and if it remains for 5s or longer, the MS will startthe cell reselection and access to the new cell. Note

that the cell reselection caused by the parameter C2

should be originated at least at the interval of 15s so

as to avoid the frequent cell reselection by MS.




CELL SELECTION HYSTERESIS(1)

When a MS reselects a cell, if the old cell and the

target cell are in different locations, then the MS must

initiate a location updating process after cell

reselection. Due to the fading features of the radio

channel, the C2 values of two adjacent cells measuredalong their borders will fluctuate greatly. As a result,

the MS will frequently conduct the cell reselection,

which will not only increase the network signaling flow

and lead to low efficiency use of radio resources, butreduces the access success rate of the system, as the

MS cannot respond to paging calls in the location

updating process.




CELL SELECTION HYSTERESIS(2)

• To minimize the influence of this issue, the GSM

specifications put forward a parameter called cellselection hysteresis (CSH), which requires that the

signal level of adjacent cell (in a different location area)

be larger than the local cell signal level, and their

difference be larger than the value specified by thecell selection hysteresis. In this case, the MS will start

the cell reselection.

• The cell selection hysteresis is represented in decimalnumerals, its unit is dB, its range is 0～14, its step

length is 2dB, and its default value is 4.




CRO,TO and PT 1

• The cell reselection initiated by the radio channel

quality regards C2 as the standard. C2 is aparameter based on C1 plus some artificial offset

parameters. The artificial influence is to encourage

the MS to take the priority in accessing to some cells

or prevent it from accessing to others. Thesemethods are often used to balance the traffic in the

network.

• In addition to C1, there are three other factorsinfluencing C2, namely: CELL_RESELECT_OFFSET

(CRO), TEMPORARY_OFFSET (TO) and

PENALTY_TIME (PT).




CRO,TO and PT 2

The adjustments of above 3 parameters are as

followed:

1. In general, it’s not expected that MS access thecells where the traffic is very heavy or thechannel quality is very low. In this case , the PTmay be set 31, making TO invalid, so C2=C1-CRO.Because the C2 is lowered deliberately, thepossibility that the cell will be reselected by MS is

lowered greatly. The greater the CRO, the lesspossibility that the cell will be reselected, andvice versa.




CRO,TO and PT 3

2. On the other hand, it’s expected that MS stay

as much as possible in cells where the systemutilization are very low and the traffic load is light.In this case, it’s recommended that CRO beranged from 0 to 20dB. The greater the CRO, the

more possible the cells will be reselected ,andvice versa. It’s also suggested that TO is equal ora litter higher than CRO. PT, whose main role is toavoid frequent cell reselection by MS, is generally

recommended to be set at 20 seconds or 40seconds.




3. For cells where the traffic is moderate, therecommended value for CRO is zero and PT 620seconds, thus causing C2=C1, i. e. no artificialimpact will be imposed.




CBA

In the system message broadcasting in each cell, there is

a bit information indicating whether to allow the MS toaccess to it, which is called cell bar access (CBA). The

parameter CBA is to indicate whether the cell bar access

is set in a cell.

The parameter is represented in character string. Its valuerange is:

YES: Set the CBA; NO: Do not set the CBA.

The CBA bit is a parameter for the network operator toset. Usually all the cells are allowed to be accessed by

MS , so the bit is set NO. However, in special cases, the

telecom operator may want to assign a certain cells for

handover service only, then the bit can be set YES.




Application of CBA(1)

Area A

BTS A

BTS B

BTS C





• Suppose Area A (shaded part) in the figure is the

busy area (e.g. commercial area in a large city), we

usually adopt the micro cellular mode to increase the

access rate of the area via the limited frequency

resources. We often use the double layer network

concept, i.e. to set up BTS A (its capacity can besmaller) to cover the whole Area A, in order to reduce

the handoff times while the MS is moving rapidly.

•





• In general situations, the MS works in the micro

cellular (you can set the priority of the cell and proper

reselect parameter to achieve this purpose). When

the MS is moving at a fast speed during a

conversation, the network will force the MS to be

handed over to BTS A.





• If the MS is just near BTS A and at the edge of a micro

cellular after the conversation, the MS will not start thecell reselect process according to the GSM

specifications because the signal quality of BTS A is far

better than that of the micro cellular BTS . As a result,

the MS cannot return to the micro cellular cell. As thecapacity of BTS A is usually smaller, the above

situation will lead to the congestion of BTS A. To solve

this problem, you can set the CBA of BTS A as 1, that

is to forbid the MS from directly accessing to BTS A,

and permit only the handover service to access to the

coverage of BTS A.




CBQ

In areas where the cells overlay with each other and differ in

capacity, traffic and functions, the telecom operator often

hopes that the MS can have priority in selecting some cells,

that is, the setting of cell priority. This function is set by way of

the parameter "Cell Bar Qualify" (CBQ).

CBQ CBA Cell selection priority Cell reselection state

• NO NO Normal Normal

• NO YES Barred Barred

• YES NO Low Normal• YES YES Low Normal




Example of CBQ Setting

For some reasons, the traffic of Cells A and B is apparently higher

than that of other adjacent cells. To balance the traffic in the whole

area, you can set the priority of Cells A and B as low, and set the

priority of the rest cells as normal so that the traffic in the shade area

will be absorbed by adjacent cells. It must be noted that the result of

this setting is that the actual coverage of Cell A and Cell B is narrowed.

However, this is dissimilar to reducing the transmitting power of Cell A

and Cell B, the latter may cause blind areas of the network coverage

and the reduction of communication quality.。




Random Access

Random access is the process that messages beingtransmitted on RACH when a MS turns from “idle” to

“specialized” mode.

The main parameters includes:

•MAX RETRANS

•AC

•RE




MAX RETRANS(1)

• When starting the immediate assignment process(e.g, when MS needs location updating, originating

calls or responding to paging calls), the MS will

transmit the "channel request" message over the

RACH to the network. As the RACH is an ALOHA

channel, in order to enhance the MS access successrate, the network allows the MS to transmit multiple

channel request messages before receiving the

immediate assignment message. The numbers of

maximum retransmission (MAX RETRANS) aredetermined by the network.




MAX RETRANS(2)

The MAX RETRANS is often set in the following ways:• For areas (suburbs or rural areas) where the cell radius is

more than 3km and the traffic is smaller, the MAX

RETRANS can be set 11(i.e. the MAX RETRANS is 7).

• For areas (not bustling city blocks) where the cell radius isless than 3km and the traffic is moderate, the MAX

RETRANS can be set 10（i.e. the MAX RETRANS is 4）.

• For micro-cellular, it’s recommend that the MAX

RETRANS be set 01（

i.e. the MAX RETRANS is 2）

.• For microcellular areas with very high traffic and cells with

apparent congestion, it’s recommend that the MAX

RETRANS be set 00（i.e. the MAX RETRANS is 1).




Access Control (AC)(1)

In some special conditions, the telecom operator wants to

bar all or part of MS from sending out the access request or

paging response request in some special areas. For

example, in case some areas are in emergency state or in

case a GSM PLMN encounters a serious fault. For this

reason, GSM Specification（02.11）stipulates that eachGSM subscriber (ordinary subscriber) is allocated with an

access level. The access level ranges from 0 to 9 and is

stored in the SIM card of the subscriber. The GSM

Specifications reserves 5 special access levels for somespecial subscribers, which range from 11 to 15. These levels

usually have higher access priority. Special subscribers can

have one or more access levels (11~15), and their access

levels are also stored in the SIM cards.




AC(2)

The access levels are distributed as follows:

• C 0～C9: ordinary subscribers;

• C11: used for PLMN management;

• C12: used by the security department;

• C13: public utilities（e.g. water, gas）;

• C14: emergency service;

• C15: PLMN staff.




Setting of AC

• In the BS installation and commissioning process or

in the process of maintaining or testing some cells,the operator can set C0～C9 as 0 to forcedly forbid

the access of ordinary subscribers so as to reduce

the unnecessary effects on the installation or

maintenance work.• In some cells with very high traffic, the congestion will

occur in busy hours. For example, the RACH conflict

happens frequently, the AGCH is overloaded and the

Abis interface flow is overloaded. The networkoperator can set proper access control parameters

（C0～C15）to control the traffic of some cells.




Reestablishment Enable RE

• For the drop calls caused by the radio link fault due to the

burst interference or blind areas owing to the high risebuildings, the MS can start the call reestablishment process to

resume the conversation, but the network is entitled to

determine whether the call reestablishment is allowed or not.

“0”=Yes, “1”=No.

• In some special circumstances, the drop call may occur when

the MS goes through a blind area during the conversation. If

the call reestablishment is allowed, the mean drop call rate

will be reduced. However, the call reestablishment process

will occupy a longer period of time, most of the subscribershave hung up before the reestablishment process is over, as

a result, the call reestablishment failed to achieve its purpose

and wasted many radio resources. We recommend that the

call reestablishment be not allowed in the network except for

some individual cells.




LIMITn(1)

According to GSM Specification 05.08, the BTS mustmeasure the interference levels of the upward links of all

the free channels for the purpose of providing basis for

managing and allocating radio resources. Moreover, the

BTS should analyze its measured results, divide the

interference levels into 5 grades and report them to the

BSC. The division of the 5 interference grades (i.e. the so-

called interference bands) is set by the operator through the

man-machine interface. The parameter "Interference band

border(LIMITn)” determines the borders of the 5interference bands.




Setting of LIMITn

0 <-110dBm

1 -110dBm－ -109dBm2 -109dBm－ -108dBm

… …

61 -50dBm－ -49dBm

62 -49dBm－ -48dBm

Default: LIMIT1 4 LIMIT2 8 LIMIT3 15 LIMIT4 25

The division of the interference bands should be favorable in describing

the interference in the system. Generally the default values are

recommended. In the ordinary situations, the free channel interferencelevel is smaller, so the LIMIT1～4 value should be smaller. Whenapparently large interference appears in the system, you can properly

increase the LIMIT1~4 values in order to know the exact interference.




IMSI Attach/Detach(ATT) 1

The IMSI detach process is that: the MS notifies the network that itis moving from the working state to the non-working state, or the

process of the SIM card being taken from the MS. When receiving

the notification from the MS, the network will indicate the IMSI

subscriber to be in the non-working state, so the connection

request ending the subscriber as the called party will be rejected.The corresponding IMSI attach process is that the MS notifies the

network that it has been in the working state , or the SIM card is re-

inserted into the MS. When the MS re-enters the working state, it

will detect whether the current LAI is the same as the LAI finally

recorded in the MS. If they are the same, the MS will start the IMSIattach process, otherwise the MS will start the location updating

process (instead of the IMSI attach process). When receiving the

location updating or IMSI attach process, the network will indicate

the IMSI subscriber being in the working state.




IMSI Attach/Detach(ATT) 2

An ATT mark should be set as YES so that the network will no longer

process the connection process using the MS as the called after theMS shuts down, thus saving the processing time of the network

entities and saving lots of network resources.

Please note that the ATT in different cells but in the same location

area should be set the same. Because the shutdown of the MS in

cells where the ATT is YES will start the IMSI detach process, and thenetwork will record the fact that the MS is in the non-working state and

reject all the connection requests when using MS as the called. When

the MS restarts and is in the same location area (so the location

update process is not started) as when it shuts down but is in a

different cell and the ATT of the cells is set as NO, so the MS will notstart the IMSI attach process, either. In this case, the MS cannot

become the called party until it starts the location updating process.




CCCH_CONF

The CCCH can be one or more physical channels. The

CCCH and SDCCH can share the same physical channel.The combination mode of the common control channel in a

cell is determined by the CCCH_CONF.

CCCH_CONF Coding Meanings CCCH message blocks in one

BCCH000 CCCH use one basic physical channel, not shared with SDCCH 9

001 CCCH use one basic physical channel, shares with SDCCH 3

010 CCCH use two basic physical channels, not shared with SDCCH 18

100 CCCH use three basic physical channels, not shared with SDCCH 27

110 CCCH use 4 basic physical channels, not shared with SDCCH 36

Others Reserved




Setting and Impact of CCCH_CONF

The CCCH_CONF is determined by the telecomoperation department according to the traffic model of a

cell. It is often decided in the system design period.

According to the ordinary experience, if a cell has 1 or 2

TRX, we recommend that the CCCH uses one basic

physical channel and shares it with the SDCCH; if a cellhas 3 or 4 TRX, we recommend that the CCCH uses one

basic physical channel but does not share it with the

SDCCH.




AGBLK

Since the CCCH consists of the access grant channel

(AGCH) and paging channel (PCH), it is necessary toset how many blocks of the CCCH information blocks

are reserved and dedicated to the AGCH. To let the MS

know about the configuration information, the system

message of every cell contains a configurationparameter, that is, the access grant reserve blocks

(AGBLK).

AGBLK is represented in decimal numerals, and its

value range is:• CCCH is not combined with SDCCH: 0～7.

• CCCH is combined with SDCCH: 0～2.




Setting and Impact of AGBLK

The AGBLK setting principle is: given that the AGCH is

not overloaded, try to reduce the parameter as much aspossible to shorten the time when the MS responds to the

paging and improve the quality of service of the system.

The recommended value of AGBLK is usually 1 (when the

CCCH is combined with the SDCCH), 2 or 3 (when the

CCCH is not combined with the SDCCH).




BS-PA-MFRMS

According to the GSM specifications, every mobile

subscriber belongs to a paging group. In every cell, everypaging group corresponds to a paging subchannel, the MScalculates the paging group to which it belongs by basingon its own IMSI, then calculates the location of the pagingsubchannel belonging to the paging group. In an actual

network, the MS only "receives“ the contents in the pagingsubchannel to which it belongs but ignores the contents inother paging subchannels, or even turn off the powersupply of some hardware equipment of the MS for otherpaging subchannels to save the MS power overhead (i.e.DRX source). The BS-PA-MFRMS refers to how many multi-frames are used as a cycle of a paging subchannel. Thisparameter in fact determines how many paging sub-channels are to be divided from the paging channels of a

cell.




BS-PA-MFRMS is represented in decimal numerals

and its value range is 2 9, its unit is multiframe51 frames , its default value is 2

BS-PA-MFRMS Multiframes of the same paginggroup that cycle on the pagingchannel

2 2

3 3

4 4

5 5

6 6

7 7

8 8

9 9




Periodic Updating Timer (T3212

The reasons for the location update in the GSM system are

of two types: one is that the MS finds its location area

changed (with a different LAC), the other one is that the

network requires the MS to periodically update its location.

The frequency of periodic location update is controlled viathe network and the period length is determined by the

parameter T3212.

In general, in areas with larger traffic and signaling flow,

you should select the larger T3212（e.g. 16 hours, 20

hours or even 25 hours）, but in areas with smaller trafficand lower signaling flow, you can set the smallerT3212 (3

hours or 6 hours, etc.). In areas where traffic is far beyond

the system capacity, we recommend that you set T3212 as

0.




NCCPERM(1)

In the connection mode (during the conversation), the

MS will report the measured signals of the adjacent

cells to the BS, but each report may contain at most 6

adjacent cells, Therefore, let the MS only report the

information of the cells that may become the hand-over

target cells, do not let the MS report the informationmerely according to the signal level without selection

(usually do not let the MS report other GSMPLMN cells).

The above functions can be fulfilled by limiting the MS

to merely measure the cells whose NCC have beenspecified. The NCCPERM lists the NCCs of cells to be

measured by the MS.




NCCPERM(2)

• In general, each area is allocated with one (or several)

NCC. The NCCPERM of each cell in the area shouldcontain the NCC of the area, otherwise a large

number of cross-cell drop calls will occur and the cell

reselection will fail. To ensure the normal roaming

between different areas, the border cells of an areashould contain the NCC of its adjacent areas.




RLT

• During the MS conversation-, when the downward

voice (or data) quality is degraded to be unacceptableand cannot be improved through the RF power control

or handover (i.e. the so-called radio link fault), the MS

will either start the call re-connection or forcedly

disconnect the link. As the forced disconnection

actually means a "drop call" process, the MS will

regard it as a downward radio link fault when the

communication quality is unacceptable (usually the

user has to hang up). In this case, it is provided in the

GSM specifications that the MS needs a counter S toassign an initial value--"downward radio link timeout"--.

When S is counted to 0, the MS will report the

downward radio link fault.




MBCR 1

In the single band GSM system, when the MS reports

the adjacent cell measurement result to the network, it

only needs to report the contents of the 6 adjacent cells

with the strongest signals in a band. When multiple

bands form a network, the telecom operator often,

according to the actual situation of the network, wantsthe MS to access to a frequency band with priority

during the handover, so the operator hopes that the MS

will report the measurement result on the basis of not

only signal strength but signal band as well. Theparameter "multiband indication (MBCR)" is used to

notify the MS that it should report the multiband

adjacent cell contents.

The value is 0-3




MBCR 2

• 0: Based on the signal strength of adjacent cells, the

MS reports the measurement results of 6 adjacent

cells whose signals are the strongest, whose NCC

are known and allowed no matter in which band the

adjacent cells lie.

The default value is “0”




MBCR 3

• 1: The MS should report the measurement result of anadjacent cell in each band (not including the band usedby the current service area) in the adjacent table, whosesignal is the strongest and whose NCC is alreadyknown and allowed. It should also report in the restposition the adjacent cells in the band used by thecurrent service area. If there are still rest positions, it willreport the information of the rest adjacent cells nomatter in which band these adjacent cells lie.




MBCR 4

• 2: The MS should report the measurement results of two adjacent cells in each band (not including the bandused by the current service area) in the adjacent table,whose signals are the strongest and whose NCC arealready known and allowed. It should also report in the

rest position the adjacent cells in the band used by thecurrent service area. If there are still rest positions, itwill report the information of the rest adjacent cells nomatter in which band these adjacent cells lie.




MBCR 5

• 3: The MS should report the measurement results of three adjacent cells in each band (not including the

band used by the current service area) in the adjacent

table, whose signals are the strongest and whose

NCC are already known and allowed.

8.radio parameters

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