Setting Enhanced Access Parameters

Last updated: December 20, 2004

This section is only applicable to the lab application and to a test application with the required feature license.

When the test set is configured to support Enhanced Access Channels (R-EACH) (see Control Channels Configuration ), the test set monitors the R-EACH used by the mobile station to initiate communication with the test set or to respond to a mobile station directed messages.

The test set only supports a single R-EACH channel in Basic Access Mode (see Fixed IS-2000 Enhanced Access Parameters ).

Enhanced Access Channel Structure

The R-EACH transmission consists of one or more sequences of one or more enhanced access probes. Each enhanced access probe in basic access mode consists of an R-EACH preamble followed by enhanced access data. The enhanced access data is transmitted with a R-Pilot channel as shown below.

IS-2000 Enhanced Access Parameters

The test set allows you to specify the following enhanced access parameters which are included in the Enhanced Access Parameters Message ( Enhanced Access Parameters Message Settable Fields ) sent to the mobile station on the Primary Broadcast Control Channel (F-BCCH).

Maximum Request Sequence (MAX_REQ_SEQ): This parameter specifies the maximum number of access probe sequences a mobile station is to transmit for an enhanced access channel request.
GPIB Command: CALL[:CELL]:APARameter:SEQuence:REQuest[:MAXimum] ).
Maximum Response Sequence (MAX_RSP_SEQ): This parameter specifies the maximum number of access probe sequences a mobile station is to transmit in response to a paging request.
GPIB Command: CALL[:CELL]:APARameter:SEQuence:RESPonse[:MAXimum] ).
RL Gain Common to Pilot (RLGAIN_COMMON_PILOT): This parameter specifies the gain adjustment of the R-EACH relative to the reverse pilot channel. It is used by the mobile station to determine what initial level to set the R-EACH. The RLGAIN_COMMON_PILOT multiplied by 0.125 is converted to dB value. See Equation B for details on how this parameter is used.
GPIB Command: CALL[:CELL]:PARameter:EACCess:RLGain:CTPilot .
Interference Correction Threshold (IC_THRESH): This setting specifies the threshold level (in units of 1 dB) at which the interference correction begins to be applied for the mobile station output power. The negative value of this setting is used by the mobile station to calculate the open loop power and by the test set to calculate the expected mobile power. See Base Equation for details on how this parameter is used.
GPIB Command: CALL[:CELL]:PARameter:EACCess:ICORrection:THReshold .
Interference Correction Maximum (IC_MAX): This setting specifies the maximum interference correction that can be applied for the R-EACH when calculating the mobile station output power. The IC_MAX is in units of 1 dB. See Base Equation for details on how this parameter is used.
GPIB Command: CALL[:CELL]:PARameter:EACCess:ICORrection[:MAXimum] .
EACH Nominal Power (EACH_NOM_PWR): This parameter specifies the nominal transmit power offset for the R-EACH, in units of 1 dB. It is the correction factor to be used by a mobile station in the open loop power estimate (see Base Equation for details).
GPIB Command: CALL[:CELL]:PARameter:EACCess:POWer:NOMinal .
EACH Initial Power (EACH_INIT_PWR): This parameter specifies the initial power offset for the R-EACH, in units of 1 dB. It is the correction factor to be used by a mobile station in the open loop power estimate for the initial transmission on R-EACH (see Base Equation for details).
GPIB Command: CALL[:CELL]:PARameter:EACCess:POWer:INITial
EACH Power Step (EACH_PWR_STEP): This parameter specifies the power increment (in units of 1 dB) that a mobile station is to transmit between successive enhanced access probes in an access probe sequence for the R-EACH.
GPIB Command: CALL[:CELL]:PARameter:EACCess:POWer:STEP[:LEVel] .
EACH Number of Steps (EACH_NUM_STEP): This parameter specifies the number of enhanced access probes that a mobile station is to transmit in a single access probe sequence.
GPIB Command: CALL[:CELL]:PARameter:EACCess:POWer:STEP:COUNt .

EACH Rate Supported (EACH_BA_RATES_SUPPORTED): This setting is used to specify the data rates that the mobile station can send on the R-EACH. The test set directs the mobile station to use the indicated data rate for the R-EACH (see R-EACH Rate Supported ). This setting also affects the expected mobile power ranging when the R-EACH is enabled (see Expected Power ).
GPIB Command: CALL[:CELL]:PARameter:EACCess:DRATe[:SUPPorted]

R-EACH Rate Supported
R-EACH Rate Supported Setting	Data Rate	Frame Length	Comments
9.6 kbps, 20 ms	9.6 kbps	20 ms	When a single data rate is selected, the test set directs the mobile station to use the indicated data rate on the R-EACH.
19.2 kbps, 20 ms	19.2 kbps	20 ms
All Rates, 20 ms	9.6 kbps and 19.2 kbps	20 ms	When more than one rate is allowed, multiple bits of the EACH_BA_RATES_SUPPORTED field are set and the mobile station will determine the data rate to be used according to the standards. In this case the test set can not know which rate will be used at any given time.

Fixed IS-2000 Enhanced Access Parameters

The following parameters (included in the Enhanced Access Parameters Message ) are fixed by the test set.

Fixed Settings for R-EACH
Settings	Fixed Value	Description
ACCESS_MODE	000	Indicates the test set only supports Basic Access mode (`000') and forces the mobile station to use Basic Access mode for the R-EACH.
NUM_EACH_BA	0	Indicates the test set only supports one R-EACH in Basic Access Mode.
EACH_PREAMBLE_ENABLED	1	Indicates the test set will include EACH preambles related information in the Enhanced Access Parameters message.
EACH_PREAMBLE_NUM_FRAC	0	Indicates the test set forces the mobile station to send one fractional preamble prior to the R-EACH access data.
EACH_PREAMBLE_FRAC_DURATION	15 (20 ms)	Indicates the duration of a fractional preamble (in units of 1.25 ms) sent by the mobile station is 20 ms (determined by this value plus one times 1.25 ms).
EACH_PREAMBLE_OFF_DURATION	0 (0 ms)	Indicates the fractional preamble gated-off duration (in units of 1.25 ms) on an R-EACH. The test set forces the mobile station to generate fractional preamble without gating.
EACH_PREAMBLE_ADD_DURATION	0 (0 ms)	Indicates the additional preamble duration (in units of 1.25 ms) on an R-EACH. The test set forces the mobile station not to generate additional preamble.

Setting Enhanced Access Parameters

Enhanced Access Channel Structure

IS-2000 Enhanced Access Parameters

Fixed IS-2000 Enhanced Access Parameters

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