2section (Continued) 6 Layer 3 Processing

2.6.6.2.8.3 Search of Pilots on the CDMA Candidate Frequency

2.6.6.2.8.3.1 CDMA Candidate Frequency Single Search

The mobile station does a single search of the Candidate Frequency Search Set by performing the following actions at the action time of the Candidate Frequency Search Control Message or the Candidate Frequency Search Request Message that started the search:

• If ALIGN_TIMING_USED_s is set to ‘0’, the mobile station shall measure the strength of all pilots in the Candidate Frequency Search Set in one or more visits to the Candidate Frequency, as described in 2.6.6.2.8.3.3.

• If ALIGN_TIMING_USED_s is set to ‘1’, the mobile station shall measure the strength of all pilots in the Candidate Frequency Search Set in one or more scheduled visits (see below) to the Candidate Frequency, as described in 2.6.6.2.8.3.3.

The mobile station shall schedule visits to the Candidate Frequency only at ((0.00125  SEARCH_OFFSET_s) + k (SEARCH_TIME_RESOLUTION_s  inter_visit_time)) seconds after the action time of the Candidate Frequency Search Request Message or the Candidate Frequency Search Control Message that started the search, where

and

• The mobile station shall complete the measurements and send a Candidate Frequency Search Report Message within ((0.00125  SEARCH_OFFSET_s) + freshness_interval) seconds after the action time of the Candidate Frequency Search Control Message, or the Candidate Frequency Search Request Message, where freshness_interval is determined as follows:

– If the value of the TOTAL_OFF_TIME_FWD field or of the TOTAL_OFF_TIME_REV field of the last Candidate Frequency Search Response Message sent by the mobile station to the base station is greater than or equal to é(T_70m - T_71m)/ SEARCH_TIME_RESOLUTION_sù, then

freshness_interval = (max (fwd_time, rev_time) + T_71m) seconds,

where

and

– Otherwise,

The mobile station shall set the fields of the Candidate Frequency Search Report Message as follows:

– The mobile station shall report the two components of the Candidate Frequency in the CDMA_FREQ and BAND_CLASS fields.

– The mobile station shall report the received power on the Candidate Frequency and on the Serving Frequency in the CF_TOTAL_RX_PWR and SF_TOTAL_RX_PWR fields, respectively.

– For each pilot in the Candidate Frequency Search Set that measures above CF_T_ADD_s, the mobile station shall report its phase and strength in the fields PILOT_PN_PHASE and PILOT_STRENGTH, respectively.

2.6.6.2.8.3.2 Candidate Frequency Periodic Search

When the mobile station performs a periodic search, it periodically searches the Candidate Frequency Search Set and reports the results to the base station in the Candidate Frequency Search Report Message, as described in this section. The mobile station may measure all pilots in the Candidate Frequency Search Set in one visit to the Candidate Frequency, or it may visit the Candidate Frequency several times in a search period, each time measuring all or some of the pilots in the Candidate Frequency Search Set, as described in 2.6.6.2.8.3.3.

If SF_TOTAL_EC_THRESH_s is not equal to ‘11111’, while tuned to the Serving Frequency (specified by CDMACH_s and CDMABAND_s), the mobile station shall measure the total received power spectral density, in mW/1.23 MHz, on the Serving Frequency at least once every 20 ms frame. The mobile station shall maintain the average of the spectral density (spec_density) over the last N_12m frames.

(In the following, (E_c/I_o)_total is the total E_c/I_o of the pilots in the Active Set, measured as specified in 2.6.6.2.2, and total_ec is defined as ( log₁₀ ((E_c/I_o)_total spec_density)).)

The mobile station shall maintain a periodic search timer as follows:

• When the mobile station starts a periodic search, it shall set the periodic search timer to the value in Table 2.6.6.2.8.3.2-1 corresponding to SEARCH_PERIOD_s and shall enable the timer.

– If the periodic search is started by a Candidate Frequency Search Request Message or a Candidate Frequency Search Control Message, then the mobile station shall start the periodic search (0.00125  SEARCH_OFFSET_s) seconds after the action time of the Candidate Frequency Search Request Message or the Candidate Frequency Search Control Message that started the search.

• 
  If the periodic search is started following successful or unsuccessful handoff attempt, the mobile station shall start the periodic search:
  

+ Upon sending the Candidate Frequency Search Report Message, in the case that the handoff was unsuccessful.

• When the periodic search timer expires, the mobile station shall reset the periodic search timer to the value in Table 2.6.6.2.8.3.2-1 corresponding to SEARCH_PERIOD_s and shall re-enable the timer.

• If ALIGN_TIMING_USED_s is set to ‘0’, SF_TOTAL_EC_THRESH_s is not equal to ‘11111’ and SF_TOTAL_EC_IO_THRESH_s is equal to ‘11111’, the mobile station shall perform the following actions once per frame:

– Disable the periodic search timer if total_ec is not less than
(-120 + 2  SF_TOTAL_EC_THRESH_s).

• 
  Reset the expiration time of the periodic search timer to the value in Table 2.6.6.2.8.3.2-1 corresponding to SEARCH_PERIOD_s, and re-enable the timer if the following conditions are true:
  

 total_ec is less than (-120 + 2  SF_TOTAL_EC_THRESH_s).

• If ALIGN_TIMING_USED_s is set to ‘0’, SF_TOTAL_EC_THRESH_s is equal to ‘11111’ and SF_TOTAL_EC_IO_THRESH_s is not equal to ‘11111’, the mobile station shall perform the following actions once per frame:

– Disable the periodic search timer if (-20 log₁₀ (E_c/I_o)_total) is not greater than SF_TOTAL_EC_IO_THRESH_s.

• 
  Reset the expiration time of the periodic search timer to the value in Table 2.6.6.2.8.3.2-1 corresponding to SEARCH_PERIOD_s, and re-enable the timer if the following conditions are true:
  

 (-20 log₁₀ (E_c/I_o)_total) is greater than SF_TOTAL_EC_IO_THRESH_s.

• If ALIGN_TIMING_USED_s is set to ‘0’, SF_TOTAL_EC_THRESH_s is not equal to ‘11111’ and SF_TOTAL_EC_IO_THRESH_s is not equal to ‘11111’, the mobile station shall perform the following actions once per frame:

• 
  Disable the periodic search timer if the following conditions are true:
  

 (-20 log₁₀ (E_c/I_o)_total) is not greater than SF_TOTAL_EC_IO_THRESH_s.

• 
  Reset the expiration time of the periodic search timer to the value in Table 2.6.6.2.8.3.2-1 corresponding to SEARCH_PERIOD_s, and re-enable the timer if the following conditions are true:
  

 total_ec is less than (-120 + 2  SF_TOTAL_EC_THRESH_s), or (-20 log₁₀ (E_c/I_o)_total) is greater than SF_TOTAL_EC_IO_THRESH_s.

• The mobile station shall maintain the periodic search timer independent of the total E_c and the total E_c/I_o of the pilots in the Serving Frequency Active Set, if any of the following conditions is true:

• 
  ALIGN_TIMING_USED_s is set to ‘1, or
  
• 
  SF_TOTAL_EC_THRESH_s is equal to ‘11111’ and SF_TOTAL_EC_IO_THRESH_s is equal to ‘11111’.
  

SEARCH_PERIODs	Search Period (seconds)	SEARCH_PERIODs	Search Period (seconds)
0	0.48	8	30
1	0.96	9	40
2	2	10	50
3	2.96	11	60
4	4	12	80
5	4.96	13	100
6	10	14	150
7	20	15	200

If the periodic search timer is enabled, the mobile station shall perform the following actions before the timer expires:

• If ALIGN_TIMING_USED_s is set to ‘0’, the mobile station shall measure the strength of all pilots in the Candidate Frequency Search Set at least once in one or more visits to the Candidate Frequency, as described in 2.6.6.2.8.3.3.

• If ALIGN_TIMING_USED_s is set to ‘1’, the mobile station shall measure the strength of all pilots in the Candidate Frequency Search Set in one or more scheduled visits (see below) to the Candidate Frequency, as described in 2.6.6.2.8.3.3.

The mobile station shall schedule visits to the Candidate Frequency only at ((0.00125  SEARCH_OFFSET_s) + k (SEARCH_TIME_RESOLUTION_s  inter_visit_time)) seconds after the action time of the Candidate Frequency Search Request Message or the Candidate Frequency Search Control Message that started the search, where

k = an integer between 0 and max_num_visits, inclusive, where max_num_visits is the value of MAX_NUM_VISITS field of the last Candidate Frequency Search Response Message sent by the mobile station,

and

– The mobile station shall abort a scheduled visit to the Candidate Frequency if at the scheduled time, one or both of the following conditions hold:

+ SF_TOTAL_EC_THRESH_s is not equal to ‘11111’ and total_ec is not less than
(-120 + 2  SF_TOTAL_EC_THRESH_s), or

+ SF_TOTAL_EC_IO_THRESH_s is not equal to ‘11111’ and (-20 log₁₀ (E_c/I_o)_total) is not greater than SF_TOTAL_EC_IO_THRESH_s.

– If the mobile station aborts a scheduled visit during a search period, it may abort all remaining scheduled visits in that search period.

• The mobile station shall send a Candidate Frequency Search Report Message if MIN_TOTAL_PILOT_EC_IO_s is equal to ‘00000’ or if (- 20  log₁₀ (E_c/I_o)_total) is less than or equal to MIN_TOTAL_PILOT_EC_IO_s, where (E_c/I_o)_total is the sum of E_c/I_o for all those pilots that measure above CF_T_ADD_s in the current search period.

The mobile station shall report the contents of the Candidate Frequency Search Report Message as follows:

– The mobile station shall report the two components of the Candidate Frequency in the CDMA_FREQ and BAND_CLASS fields.

– The mobile station shall report the received power on the Candidate Frequency and on the Serving Frequency in the CF_TOTAL_RX_PWR and SF_TOTAL_RX_PWR fields, respectively.

– For each pilot in the Candidate Frequency Search Set that measures above CF_T_ADD_s, the mobile station shall report its phase and strength in the fields PILOT_PN_PHASE and PILOT_STRENGTH, respectively.

• The mobile station shall ensure that the strength measurement for all pilots in the Candidate Frequency Search Set were obtained within freshness_interval before the Candidate Frequency Search Report Message is sent, where freshness_interval is determined as follows:

– If the value of the TOTAL_OFF_TIME_FWD field or of the TOTAL_OFF_TIME_REV field of the last Candidate Frequency Search Response Message sent by the mobile station to the base station is greater than or equal to

where

and

– Otherwise,

2.6.6.2.8.3.3 Candidate Frequency Pilot Measurements

The mobile station measures the strength of all pilots in the Candidate Frequency Search Set in one or more visits to the Candidate Frequency. The mobile station shall perform the following actions each time it visits the Candidate Frequency to measure pilot strengths:

• If the mobile station is processing the Forward Fundamental Channel, the mobile station shall stop processing the Forward Fundamental Channel. If the mobile station is transmitting on the Reverse Fundamental Channel, the mobile station shall stop transmitting on the Reverse Fundamental Channel.

• If the mobile station is processing the Forward Dedicated Control Channel, the mobile station shall stop processing the Forward Dedicated Control Channel. If the mobile station is transmitting on the Reverse Dedicated Control Channel, the mobile station shall stop transmitting on the Reverse Dedicated Control Channel.

• The mobile station shall stop processing the Forward Supplemental Code Channels and Forward Supplemental Channels (if any). The mobile station shall stop transmitting on the Reverse Supplemental Code Channels and Reverse Supplemental Channels (if any).

• The mobile station shall disable the fade timer (see 2.6.4.1.8) and the handoff drop timers corresponding to its current Active Set and Candidate Set (see 2.6.6.2.3), and shall suspend incrementing TOT_FRAMES_s, BAD_FRAMES_s, DCCH_TOT_FRAMES_s, DCCH_BAD_FRAMES_s, SCH_TOT_FRAMES_s, and SCH_BAD_FRAMES_s if applicable (see 2.6.4.1.1).

• The mobile station shall lock the accumulation of valid level changes in the closed loop mean output power and shall ignore received power control bits related to the period that the transmitter is disabled (see [2]).

• The mobile station shall store the following parameters from its current configuration:

– CDMA band class (SF_CDMABAND_s = CDMABAND_s)

– Frequency Assignment (SF_CDMACH_s = CDMACH_s)

– Pilot detection threshold (SF_T_ADD_s = T_ADD_s)

• The mobile station shall set the following parameters:

– CDMABAND_s = CF_CDMABAND_s

– CDMACH_s = CF_CDMACH_s

– T_ADD_s = CF_T_ADD_s

The mobile station shall tune to the Candidate Frequency.

• The mobile station shall not change its time reference (see [2]) until it resumes using the Serving Frequency Active Set, as described below.

• The mobile station shall measure the mean input power on the Candidate Frequency (cand_freq_pwr, in dBm / 1.23 MHz), and may use cand_freq_pwr along with the measurement of the mean input power on the Serving Frequency (avg_serving_freq_pwr, in dBm / 1.23 MHz) in the search procedure as follows:

– If DIFF_RX_PWR_THRESH_s is not equal to ‘00000’, and (cand_freq_pwr - avg_serving_freq_pwr) is less than (-30 + 2 ´ DIFF_RX_PWR_THRESH_s) dB, the mobile station may terminate the search for pilots in the current visit to the Candidate Frequency.

– If DIFF_RX_PWR_THRESH_s is equal to ‘00000’, the mobile station does not use the power measurements in the search procedure, or (cand_freq_pwr - avg_serving_freq_pwr) is not less than (-30 + 2 ´ DIFF_RX_PWR_THRESH_s) dB, the mobile station shall measure E_c/I_o for all or some of the pilots in its Candidate Frequency Search Set, using the search procedures specified in 2.6.6.2.2.

• The mobile station shall restore the following parameters:

– Pilot detection threshold (T_ADD_s = SF_T_ADD_s)

– CDMA band class (CDMABAND_s = SF_CDMABAND_s)

– Frequency assignment (CDMACH_s = SF_CDMACH_s)

• The mobile station shall tune to the Serving Frequency and shall resume using the Serving Frequency Active Set as follows:

– If the mobile station was processing the Forward Fundamental Channel prior to tuning to the Candidate Frequency, the mobile station shall resume processing the Forward Fundamental Channel. If the mobile station was transmitting on the Reverse Fundamental Channel prior to tuning to the Candidate Frequency, the mobile station shall resume transmitting on the Reverse Fundamental Channel.

– If the mobile station was processing the Forward Dedicated Control Channel prior to tuning to the Candidate Frequency, the mobile station shall resume processing the Forward Dedicated Control Channel. If the mobile station was transmitting on the Reverse Dedicated Control Channel prior to tuning to the Candidate Frequency, the mobile station shall resume transmitting on the Reverse Dedicated Control Channel.

– If the Forward Supplemental Code Channels and Forward Supplemental Channels assignment has not expired, the mobile station shall resume processing the Forward Supplemental Code Channels and Forward Supplemental Channels (if any). If the Reverse Supplemental Code Channel and Reverse Supplemental Channels assignment has not expired, the mobile station may resume transmitting on the Reverse Supplemental Code Channels and Reverse Supplemental Channels (if any).

– When the mobile station resumes transmission on the Reverse Traffic Channel, it shall use the following rules to re-enable its transmitter:

+ If the interval between the time that the mobile station disables its transmitter and the time that it resumes using the Serving Frequency Active Set is equal to or greater than (N_2m 20) ms, then the mobile station shall wait to receive a period of (N_3m  20) ms with sufficient signal quality on the physical channel corresponding to FPC_PRI_CHAN_s before it re-enables its transmitter.

+ Otherwise, the mobile station shall re-enable its transmitter no later than N_3m ´ 20 ms after the mobile station tunes to the Serving Frequency. The mobile station should re-enable its transmitter earlier. After the mobile station re-enables its transmitter, the mean output power shall be as specified in 2.1.2.4.1 for a step change in input power. If the mobile station re-enables its transmitter earlier than N_3m ´ 20 ms after it tunes to the Serving Frequency, the initial mean output power shall be as specified in [2], where the initial mean input power estimate is either:

• 
  within 6 dB of the actual mean input power, or
  
• 
  equal to the mean input power before the mobile station tuned to the Target Frequency.
  

2.6.6.2.8.3.4 Aborting CDMA Candidate Frequency Periodic Search

When the mobile station aborts a periodic search, it shall perform the following:

• The mobile station shall cancel any remaining visits to the Candidate Frequency in the current search period, and shall not send a Candidate Frequency Search Report Message for the current search period.

• The mobile station shall disable the periodic search timer.

2.6.6.2.9 Reserved

2.6.6.2.10 Reserved

2.6.6.2.11 Processing of Reverse Supplemental Code Channels and Reverse Supplemental Channels

If USE_T_ADD_ABORT_s is set to ‘1’, and the strength of a Neighbor Set or Remaining Set pilot is found to be above T_ADD_s, then the mobile station shall terminate any active transmission on Reverse Supplemental Code Channels or Reverse Supplemental Channels at the end of the current 20 ms frame. The mobile station shall perform the following:

• Any previously active Reverse Supplemental Code Channel or Reverse Supplemental Channel assignment shall be considered implicitly terminated.

• If active transmission on Reverse Supplemental Code Channels is terminated, the mobile station shall set NUM_REV_CODES_s to ‘000’ and shall set IGNORE_SCAM_s to ‘1’.

• If active transmission on Reverse Supplemental Channels is terminated, the mobile station shall set IGNORE_ESCAM_s to ‘1’.

• The mobile station shall set SCRM_SEQ_NUM_s to (SCRM_SEQ_NUM_s + 1) mod 16.

• The mobile station shall transmit a Supplemental Channel Request Message with USE_SCRM_SEQ_NUM set to ‘1’, SCRM_SEQ_NUM set to SCRM_SEQ_NUM_s, and SIZE_OF_REQ_BLOB set to ‘0000’.

2.6.6.2.12 Periodic Serving Frequency Pilot Report Procedure

• When the mobile station starts a Periodic Serving Frequency Pilot Report Procedure, it shall set the PPSMM timer to PPSMM_PERIOD_s  0.08 seconds and shall enable the timer.

• When the PPSMM timer expires, the mobile station shall send a Periodic Pilot Strength Measurement Message (2.6.6.2.5.2) to the base station, reset the PPSMM timer to PPSMM_PERIOD_s  0.08 seconds and shall re-enable the timer.

• When the mobile station receives an Extended Handoff Direction Message, a General Handoff Direction Message or a Universal Handoff Direction Message directing the mobile station to perform a hard handoff (see 2.6.6.2.5.1), it shall abort the Periodic Serving Frequency Pilot Report Procedure and disable the PPSMM timer if it is enabled.

• If MIN_PILOT_PWR_THRESH_s is not equal to ‘11111’ and MIN_PILOT_EC_IO_THRESH_s is equal to ‘11111’, the mobile station shall perform the following actions once per frame:

– Disable the PPSMM timer if the received total energy per PN chip, E_c, of the pilots in the Active Set is not less than (-120 + 2  MIN_PILOT_PWR_THRESH_s), where the value of E_c is computed as 10  log₁₀ (PS spec_density) and PS is the total E_c/I_o of the pilots in the Active Set measured as specified in 2.6.6.2.2.

– Reset the expiration time of the PPSMM timer to PPSMM_PERIOD_s  0.08 seconds and re-enable the timer if the following conditions are true:

 the PPSMM timer is disabled, and

 the received total energy per PN chip, E_c, of the pilots in the Active Set is less than (-120 + 2  MIN_PILOT_PWR_THRESH_s).

• If MIN_PILOT_PWR_THRESH_s is equal to ‘11111’ and MIN_PILOT_EC_IO_THRESH_s is not equal to ‘11111’, the mobile station shall perform the following actions once per frame:

– Disable the PPSMM timer if the total pilot strength of the pilots in the Active Set, PS, satisfies the condition that (-20  log₁₀(PS)) is not greater than MIN_PILOT_EC_IO_THRESH_s.

– Reset the expiration time of the PPSMM timer to PPSMM_PERIOD_s  0.08 seconds and re-enable the timer if the following conditions are true:

 the PPSMM timer is disabled, and

 the total pilot strength of the pilots in the Active Set, PS, satisfies the condition that (-20  log₁₀(PS)) is greater than MIN_PILOT_EC_IO_THRESH_s.

• If MIN_PILOT_PWR_THRESH_s is not equal to ‘11111’ and MIN_PILOT_EC_IO_THRESH_s is not equal to ‘11111’, the mobile station shall perform the following actions once per frame:

– Disable the PPSMM timer if the following conditions are true:

 the received total energy per PN chip, E_c, of the pilots in the Active Set is not less than (-120 + 2  MIN_PILOT_PWR_THRESH_s), and

 the total pilot strength of the pilots in the Active Set, PS, satisfies the condition that (-20  log₁₀(PS)) is not greater than MIN_PILOT_EC_IO_THRESH_s.

– Reset the expiration time of the PPSMM timer to PPSMM_PERIOD_s  0.08 seconds and re-enable the timer if the following conditions are true:

 the PPSMM timer is disabled, and

 the received total energy per PN chip, E_c, of the pilots in the Active Set is less than (-120 + 2  MIN_PILOT_PWR_THRESH_s), or the total pilot strength of the pilots in the Active Set, PS, satisfies the condition that (-20  log₁₀(PS)) is greater than MIN_PILOT_EC_IO_THRESH_s.

• If MIN_PILOT_PWR_THRESH_s is equal to ‘11111’ and MIN_PILOT_EC_IO_THRESH_s is equal to ‘11111’, the mobile station shall maintain the PPSMM timer independent of the received power and the total E_c/I_o of the pilots.

2.6.6.2.13 Call Rescue Soft Handoff

This section presents an overview and mobile station requirements for the support of call rescue soft handoff while the mobile station is in the Mobile Station Control on the Traffic Channel State.

2.6.6.2.13.1 Overview

Support for the call rescue feature is mandatory for the mobile station. The mobile station initiates call rescue soft handoff after disabling its transmitter due to:

• insufficient signal quality on the Forward Traffic Channel (see 2.6.4.1.8)

• an acknowledgment failure.

In order for a pilot to be autonomously added to the Active Set, it must be a valid soft handoff candidate on the mobile station’s neighbor list, and must also support a Rescue Channel. A Rescue Channel is a Fundamental Channel that is used for call rescue soft handoff, and has a pre-allocated Walsh Code that is provided to the mobile station as part of the General Neighbor List Message, Universal Neighbor List Message, and Extended Neighbor List Update Message.

If the mobile station is eligible to attempt call rescue soft handoff, then it re-enables its transmitter and monitors the Rescue Channel (as well as the other Traffic Channels in the Active Set) for good frames. Once good frames are received, then the call continues normally.

Three timers are used as part of call rescue soft handoff: the rescue delay timer, the rescue allowed timer, and the rescue attempt timer.

2.6.6.2.13.2 Requirements

If the rescue delay timer expires and the interval specified by RESQ_MIN_PERIOD_s has elapsed since the last successful call rescue, then the mobile station shall enable the rescue allowed timer with an initial value of (RESQ_ALLOWED_TIME_s  80) ms.

While the rescue allowed timer is enabled, if the mobile station is able to promote any new pilots to the Active Set (see 2.6.6.2.6.1), then the mobile station shall perform the following:

• disable the rescue allowed timer,

• update the service configuration as specified in 2.6.6.2.13.3.

• cancel any current and pending Forward or Reverse Supplemental Channel assignments.

• re-enable its transmitter at the last closed-loop power level plus RESQ_POWER_DELTA_s,

• enable the rescue attempt timer with an initial value of (RESQ_ATTEMPT_TIME_s  40) ms.

• transmit the Traffic Channel preamble followed by a Extended Pilot Strength Measurement Message, where the length of the Traffic Channel preamble is determined as follows:

• 
  If operating in Radio Configuration 1 or 2, the length of the Traffic Channel preamble is given by RESQ_NUM_PREAMBLE_RC1_RC2_s 20ms.
  
• 
  If operating in Radio Configuration greater than 2, the length of the Traffic Channel preamble is given by the duration corresponding to RESQ_NUM_PREAMBLE_s as specified by the Table 3.7.3.3.2.17-1.
  

If the rescue allowed timer expires, then the mobile station shall not autonomously promote any new pilots to the Active Set.

While the rescue attempt timer is enabled, the mobile station shall not perform the Forward or Reverse Traffic Channel power control procedures specified in 2.6.4.1.1 and 2.6.6.2.7.2, respectively.

If the rescue attempt timer expires, then the mobile station shall disable its transmitter.

2.6.6.2.13.3 Service Configuration Update Due to Call Rescue

The mobile station shall set CH_IND_s to ‘01’.

The mobile station shall replace the current Logical-to-Physical Mapping with the default Logical-to-Physical Mapping as specified in Table 2.6.4.2-1, where:

• requirement 1 is as follows: The SR_ID field shall be set to the SR_ID corresponding to the services mapped to the Fundamental Channel, and

• requirements 2 and 3 are as follows: the PHYSICAL_RESOURCE field shall be set to ‘0000’.

The mobile station shall replace the current Service Configuration information record with a new Service Configuration information record created as follows:

• The mobile station shall delete all Service Option Connection Records corresponding to an SR_ID that is not listed in the Call Rescue Logical-to-Physical Mapping created above and the Layer 3 shall terminate the corresponding call control instance (currently existing or pending instantiation).

• The mobile station shall identify the Call Control instance corresponding to the first service option connection listed in this newly created Service Configuration information record by the NULL identifier.

The mobile station shall set SYNC_ID_s to NULL.

2.6.6.3 Typical Message Exchanges During Handoffs

The following examples illustrate typical message exchanges between the mobile station and the base station during handoff. Refer to Annex B for examples of call processing during handoff.

Figure 2.6.6.3-1 shows an example of the messages exchanged between the mobile station and the base station during a typical handoff process if P_REV_IN_USE_s is less than or equal to three or SOFT_SLOPE_s is equal to ‘000000’.

Figure 2.6.6.3-2 shows an example of the messages exchanged between the mobile station and the base station during a typical handoff process if P_REV_IN_USE_s is greater than three and SOFT_SLOPE_s is not equal to ‘000000’.

Figure 2.6.6.3-3 illustrates the messaging triggered by a pilot of the Candidate Set as its strength gradually rises above the strength of each pilot of the Active Set if P_REV_IN_USE_s is less than or equal to three, or SOFT_SLOPE_s is equal to ‘000000’. Note that the mobile station reports that a Candidate Set pilot is stronger than an Active Set pilot only if the difference between their respective strengths is at least T_COMP  0.5 dB.

Figure 2.6.6.3-4 illustrates the messaging triggered by a pilot of the Candidate Set as its strength gradually rises above the strength of each pilot of the Active Set if P_REV_IN_USE_s is greater than three and SOFT_SLOPE_s is not equal to ‘000000’. Note that the mobile station reports that a Candidate Set pilot is stronger than an Active Set pilot only if the difference between their respective strengths is at least T_COMP  0.5 dB and Pilot P₀ strength exceeds [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁ + PS₂) + ADD_INTERCEPT/2].

(1) Pilot strength exceeds T_ADD. Mobile station sends a Pilot Strength Measurement Message and transfers pilot to the Candidate Set.

(2) Base station sends an Extended Handoff Direction Message, a General Handoff Direction Message or a Universal Handoff Direction Message.

(3) Mobile station transfers pilot to the Active Set and sends a Handoff Completion Message.

(4) Pilot strength drops below T_DROP. Mobile station starts the handoff drop timer.

(5) Handoff drop timer expires. Mobile station sends a Pilot Strength Measurement Message.

(6) Base station sends an Extended Handoff Direction Message, a General Handoff Direction Message or a Universal Handoff Direction Message.

(7) Mobile station moves pilot from the Active Set to the Neighbor Set and sends a Handoff Completion Message.

Figure 2.6.6.3-1. Handoff Threshold Example if P_REV_IN_USE_s is Less Than or Equal to Three, or SOFT_SLOPE_s is Equal to ‘000000’

(1) Pilot P₂ strength exceeds T_ADD. Mobile station transfers the pilot to the Candidate Set.

(2) Pilot P₂ strength exceeds [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁) + ADD_INTERCEPT/2]. Mobile station sends a Pilot Strength Measurement Message.

(3) Mobile station receives an Extended Handoff Direction Message, a General Handoff Direction Message or a Universal Handoff Direction Message, transfers the pilot P₂ to the Active Set, and sends a Handoff Completion Message.

(4) Pilot P₁ strength drops below [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₂) + DROP_INTERCEPT/2]. Mobile station starts the handoff drop timer.

(5) Handoff drop timer expires. Mobile station sends a Pilot Strength Measurement Message.

(6) Mobile station receives an Extended Handoff Direction Message, a General Handoff Direction Message or a Universal Handoff Direction Message, transfers the pilot P₁ to the Candidate Set and sends a Handoff Completion Message.

(7) Pilot P₁ strength drops below T_DROP. Mobile station starts the handoff drop timer.

(8) Handoff drop timer expires. Mobile station moves the pilot P₁ from the Candidate Set to the Neighbor Set.

Figure 2.6.6.3-2. Handoff Threshold Example if P_REV_IN_USE_s is Greater Than Three, and SOFT_SLOPE_s is Not Equal to ‘000000’

Candidate Set: Pilot P₀

Active Set: Pilots P₁, P₂

t₀ – Pilot Strength Measurement Message sent, P₀ > T_ADD

t₁ – Pilot Strength Measurement Message sent, P₀ > P₁ + T_COMP  0.5 dB

t₂ – Pilot Strength Measurement Message sent, P₀ > P₂ + T_COMP  0.5 dB

Figure 2.6.6.3-3. Pilot Strength Measurements Triggered by a Candidate Pilot if P_REV_IN_USE_s = 3 or SOFT_SLOPE_s = ‘000000’

Candidate Set: Pilot P₀

Active Set: Pilots P₁, P₂

t₀ – Pilot Strength Measurement Message not sent because

[10 ´ log₁₀(PS₀)] < [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁ + PS₂) + ADD_INTERCEPT/2]

t₁ – Pilot Strength Measurement Message not sent because

P₀ > [P₁ + T_COMP  0.5 dB] but
[10 ´ log₁₀(PS₀)] < [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁ + PS₂) + ADD_INTERCEPT/2]

t₁’ – Pilot Strength Measurement Message sent because

[10 ´ log₁₀(PS₀)] > [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁ + PS₂) + ADD_INTERCEPT/2]

t₂ – Pilot Strength Measurement Message sent because

P₀ > [P₂ + T_COMP  0.5 dB] and
[10 ´ log₁₀(PS₀)] > [(SOFT_SLOPE/8) ´ 10 ´ log₁₀(PS₁ + PS₂) + ADD_INTERCEPT/2]

Figure 2.6.6.3-4. Pilot Strength Measurements Triggered by a Candidate Pilot if P_REV_IN_USE_s > 3 and SOFT_SLOPE_s is Not Equal to‘000000’

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