Processing of Forward Traffic Channel Handoff Messages

2.6.6.2.5.1 Processing of Forward Traffic Channel Handoff Messages

1. Pilot Measurement Request Order: The mobile station shall send, within T_56m seconds, a Pilot Strength Measurement Message if P_REV_IN_USE is less than seven or a Extended Pilot Strength Measurement Message if P_REV_IN_USE is equal to or greater than seven.

2. Analog Handoff Direction Message: The mobile station shall process the message as specified in 2.6.6.2.9.

3. Neighbor List Update Message: The mobile station shall process the message as specified in 2.6.6.2.6.3 and set SEARCH_PRIORITY_INCL_s, SRCH_WIN_NGHBR_INCL_s, and SRCH_OFFSET_INCL_s to ‘0’, and set TIMING_INCL for each of the neighboring base stations in the Neighbor List Update Message to ‘0’.

4. Extended Handoff Direction Message: The mobile station shall process the message as follows:

The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘00000110’ (capability not supported), if the mobile station does not support the band class specified in the Extended Handoff Direction Message.

When the message takes effect, the mobile station shall perform the following:

• Update the Active Set, Candidate Set, and Neighbor Set in accordance with the Extended Handoff Direction Message processing (see 2.6.6.2.6.1, 2.6.6.2.6.2, and 2.6.6.2.6.3).

• Discontinue use of all Forward Traffic Channels associated with pilots not listed in the Extended Handoff Direction Message.

• The mobile station shall update the Code Channel List, CODE_CHAN_LIST_s, as specified in 2.6.8.

• If the mobile station is currently processing Forward Supplemental Code Channels, then it shall continue processing the Forward Supplemental Code Channels using the updated Code Channel List, CODE_CHAN_LIST_s.

• If HARD_INCLUDED is equal to ‘1’, perform the following actions:

– If FRAME_OFFSET_r is not equal to FRAME_OFFSET_s, change the frame offset on all of the code channels of the Forward Traffic Channel and of the Reverse Traffic Channel.

– If RESET_L2_r is equal to ‘1’, Layer 3 shall send a L2-Supervision.Request primitive to Layer 2 to reset the acknowledgment procedures as specified in 2.2.1.1 and 2.2.2.1 of TIA/EIA/IS-2000-4. The acknowledgment procedures shall be reset immediately after the action time of the Extended Handoff Direction Message.

– If RESET_FPC_r is equal to ‘1’, initialize the Forward Traffic Channel power control counters as specified in 2.6.4.1.1.1.

– If SERV_NEG_TYPE_r is equal to ‘1’, set SERV_NEG_s to enabled; otherwise set SERV_NEG_s to disabled. For operation in Band Class 1, SERV_NEG_s is always equal to enabled.

– Use the long code mask specified by the PRIVATE_LCM_r (see 2.3.12.3) and indicate to the user the voice privacy mode status.

– Process the ENCRYPT_MODE field as specified in 2.3.12.2.

• Store the following parameters from the current configuration:

– Serving Frequency Assignment (SF_CDMACH_s = CDMACH_s)

– Serving Frequency band class (SF_BAND_CLASS_s = BAND_CLASS_s)

– Serving Frequency frame offset (SF_FRAME_OFFSET_s= FRAME_OFFSET_s)

• If HARD_INCLUDED is not equal to ‘1’, set NUM_PREAMBLE_s = ‘000’.

• Store the following parameters from the Extended Handoff Direction Message:

– Extended Handoff Direction Message sequence number (HDM_SEQ_s = HDM_SEQ_r)

– If SEARCH_INCLUDED is equal to ‘1’, then store the following:

+ Search window size for the Active Set and Candidate Set
(SRCH_WIN_A_s = SRCH_WIN_A_r )

+ Pilot detection threshold (T_ADD_s = T_ADD_r)

+ Pilot drop threshold (T_DROP_s = T_DROP_r)

+ Active Set versus Candidate Set comparison threshold


(T_COMP_s = T_COMP_r)

+ Drop timer value (T_TDROP_s = T_TDROP_r)

+ Frame offset (FRAME_OFFSET_s = FRAME_OFFSET_r)

+ Nominal power setting of the target cell (NOM_PWR_s = NOM_PWR_r)

+ Hard handoff traffic channel preamble count required before transmitting Handoff Completion Message or Extended Handoff Completion Message (NUM_PREAMBLE_s = NUM_PREAMBLE_r )

+ CDMA band class (CDMABAND_s = BAND_CLASS_r)

+ Frequency assignment (CDMACH_s = CDMA_FREQ_r)

+ Nominal power setting of the target cell (If CDMABAND_s = ‘00001’, then NOM_PWR_EXT_s = NOM_PWR_EXT_r; otherwise, NOM_PWR_EXT_s = ‘0’)

– If ADD_LENGTH is not equal to ‘000’, then store the following:

+ Protocol revision level (P_REV_s = P_REV_r)

+ Protocol revision level currently in use (P_REV_IN_USE_s = the minimum value of P_REV_s and MOB_P_REV_p of the current band class)

• Perform a soft or hard handoff depending on the following conditions:

– If any of the following conditions is true, the mobile station shall perform a hard handoff:

+ HARD_INCLUDED is set to ‘1’ and either BAND_CLASS_r is not equal to SF_CDMABAND_s, CDMA_FREQ_r is not equal to SF_CDMACH_s, or FRAME_OFFSET_r is not equal to SF_FRAME_OFFSET_s, or

+ The set of pilots specified by the message is disjoint from the Active Set prior to the action time of the message.

– If the mobile station performs a hard handoff, it shall do the following:

+ If a Periodic Serving Frequency Pilot Report Procedure is in progress, abort the procedure (see 2.6.6.2.12).

+ If a Candidate Frequency periodic search is in progress, abort the periodic search (see 2.6.6.2.8.3.4 and 2.6.6.2.10.4) and set PERIODIC_SEARCH_s to ‘0’.

+ Perform the actions specified in 2.6.6.2.8.1. If the message specifies more than one pilot, the mobile station shall also perform the actions specified in 2.6.6.2.7.1 and 2.6.6.2.7.2.

– Otherwise, the mobile station shall perform a soft handoff as specified in 2.6.6.2.7.

5. Candidate Frequency Search Request Message: The mobile station shall process the message as follows:

The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘00000110’ (capability not supported), if any of the following conditions is true:

• SEARCH_MODE_r is not equal to ‘0000’, and the mobile station does not support the capability specified by SEARCH_MODE_r, or

• P_REV_IN_USE_s is less than or equal to four, and the mobile station does not support mobile-assisted hard handoff.

If SEARCH_MODE_r is equal to ‘0000’, the mobile station shall process the Candidate Frequency Search Request Message as follows:

• The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘00001100’ (invalid Frequency Assignment), if the Frequency Assignment specified in the message is the same as the Serving Frequency (BAND_CLASS_r is equal to CDMABAND_s and CDMA_FREQ_r is equal to CDMACH_s).

• The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘00001010’ (search set not specified), if SEARCH_TYPE_r is equal to ‘01’ or ‘11’, and one of the following conditions is true:

 PILOT_UPDATE_r is equal to ‘1’ and the message specifies an empty search set.

• The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘0001101’ (search period too short), if SEARCH_TYPE_r is equal to ‘11’ and search_period is less than (max (fwd_time, rev_time ) + T_71m) seconds, where search_period, fwd_time and rev_time are defined below.

(In the following, if PILOT_UPDATE_r is equal to ‘1’, rec_search_set is the set of pilots specified in the Candidate Frequency Search Request Message with the corresponding SEARCH_SET field set to ‘1’; otherwise, rec_search_set is the Candidate Frequency Search Set before the action time of the Candidate Frequency Search Request Message.)



search_period = time period corresponding to SEARCH_PERIOD_r shown in
Table 2.6.6.2.8.3.2-1

fwd_time = the mobile station’s estimate of the total length of time, in seconds, for which the mobile station will need to suspend its current Forward Traffic Channel processing in order to tune to the Candidate Frequency, to search rec_search_set, and to re-tune to the Serving Frequency; if the mobile station searches rec_search_set in multiple visits, fwd_time is the total time for all visits to the Candidate Frequency in a search period (see 2.6.6.2.8.3.2)

rev_time = the mobile station’s estimate of the total length of time, in seconds, for which the mobile station will need to suspend its current Reverse Traffic Channel processing in order to tune to the Candidate Frequency, to search rec_search_set, and to re-tune to the Serving Frequency; if the mobile station searches rec_search_set in multiple visits, rev_time is the total time for all visits to the Candidate Frequency in a search period

• If the mobile station does not send a Mobile Station Reject Order in response to the Candidate Frequency Search Request Message, it shall perform the following:

• 
  The mobile station shall send a Candidate Frequency Search Response Message in assured mode, within T_56m seconds of receiving the Candidate Frequency Search Request Message. The mobile station shall set the fields of the Candidate Frequency Search Response Message as follows:
  

 The mobile station shall set MAX_OFF_TIME_FWD and MAX_OFF_TIME_REV to its estimate of the maximum number of frames or power control groups for which it will need to suspend its current Forward Traffic Channel processing and Reverse Traffic Channel processing, respectively, during any single visit to tune to the Candidate Frequency, to search a subset of rec_search_set, and to re-tune to the Serving Frequency.¹⁶

 The mobile station shall set PCG_OFF_TIMES to ‘1’ if TOTAL_OFF_TIME_FWD, MAX_OFF_TIME_FWD, TOTAL_OFF_TIME_-FWD and MAX_OFF_TIME_FWD are expressed in units of power control groups. If these time estimates are expressed in units of frames, the mobile station shall set PCG_OFF_TIMES to ‘0’. The mobile station shall not use power control groups as the unit of delay if P_REV_IN_USE_s is less than six.

 If ALIGN_TIMING_r is equal to ‘1’, the mobile station shall set ALIGN_TIMING_USED to ‘1’ to indicate if it will align its search as requested by the base station; otherwise, the mobile station shall set ALIGN_TIMING_USED to ‘0’. If ALIGN_TIMING_USED is set to ‘1’, the mobile station shall set NUM_VISITS to the number of visits per search period minus one and, if NUM_VISITS is not equal to 0, the mobile station shall set INTER_VISIT_TIME, in units of frames or power control groups, to its estimate of the time between subsequent visits within the same search period.

 When the message takes effect, the mobile station shall perform the following actions:

 If any periodic search is in progress, the mobile station shall abort it (see 2.6.6.2.8.3.4 and 2.6.6.2.10.4).

 If SEARCH_TYPE_r is equal to ‘00’, the mobile station may stop maintaining the average of the Serving Frequency received power that is used in the handoff and search procedures.

 If SEARCH_TYPE_r is equal to ‘01’ or ‘11’, and the mobile station uses received power measurements in the search procedure, it should start monitoring the received power on the Serving Frequency, if it is not already doing so. While it is tuned to the Serving Frequency, the mobile station should measure the received power once every frame (0.02 seconds), and should maintain an average of the received power over the last N_12m frames.

+ Store the following parameters from the Candidate Frequency Search Request Message:

 Candidate Frequency Search Request Message sequence number (CFSRM_SEQ_s = CFSRM_SEQ_r)

 Periodic search flag: If SEARCH_TYPE_r is equal to ‘11’, the mobile station shall set PERIODIC_SEARCH_s to ‘1’; otherwise, the mobile station shall set PERIODIC_SEARCH_s to ‘0’.

 Search period on the Candidate Frequency
(SEARCH_PERIOD_s = SEARCH_PERIOD_r)

 Candidate Frequency search mode


(SEARCH_MODE_s = SEARCH_MODE_r)

 Band class for the Candidate Frequency


(CF_CDMABAND_s = BAND_CLASS_r)

 CDMA Channel number for the CDMA Candidate Frequency


(CF_CDMACH_s = CDMA_FREQ_r)

 Serving Frequency total pilot E_c threshold


(SF_TOTAL_EC_THRESH_s = SF_TOTAL_EC_THRESH_r)

 Serving Frequency total pilot E_c/I_o threshold


(SF_TOTAL_EC_IO_THRESH_s = SF_TOTAL_EC_IO_THRESH_r)

 Received power difference threshold


(DIFF_RX_PWR_THRESH_s = DIFF_RX_PWR_THRESH_r)

 Candidate Frequency Total pilot E_c/I_o threshold


(MIN_TOTAL_PILOT_EC_IO_s = MIN_TOTAL_PILOT_EC_IO_r)

 Pilot detection threshold on the CDMA Candidate Frequency


(CF_T_ADD_s = CF_T_ADD_r)

 Maximum time on the CDMA Candidate Target Frequency that the mobile station may wait to receive a period of (N_11m  20) ms with sufficient signal quality (e.g. good frames) on the physical channel corresponding to FPC_PRI_CHAN_s


(TF_WAIT_TIME_s = TF_WAIT_TIME_r)

 Pilot PN sequence offset increment on the CDMA Candidate


Frequency (CF_PILOT_INC_s = CF_PILOT_INC_r)

 Search window for pilots in the Neighbor Set on the CDMA Candidate Frequency (CF_SRCH_WIN_N_s = CF_SRCH_WIN_N_r)

 Search window for pilots in the Remaining Set on the CDMA Candidate Frequency (CF_SRCH_WIN_R_s = CF_SRCH_WIN_R_r)

 If PILOT_UPDATE is equal to ‘1’, the mobile station shall perform the following:

à Set CF_SEARCH_PRIORITY_INCL_s and CF_SRCH_WIN_NGHBR_INCL_s to the values corresponding to CF_NGHBR_SRCH_MODE shown in Table 2.6.6.2.5.1-1,

à Set CF_SRCH_OFFSET_INCL_s to CF_SRCH_OFFSET_INCL_r.

 If PILOT_UPDATE is equal to ‘1’, the mobile station shall replace the Candidate Frequency Neighbor Set with all neighbor pilots specified in the Candidate Frequency Search Request Message. Specifically, the mobile station shall store the following:

à Set the NGHBR_PN to NGHBR_PN_r.

à Set the ADD_PILOT_REC_INCL field to ADD_PILOT_INCL_r. If ADD_PILOT_REC_INCL_r is equal to ‘1’, the mobile station shall store the following:

– If NGHBR_PILOT_REC_TYPE_r equals ‘000’, the mobile station shall set the TD_POWER_LEVEL field of the Candidate Frequency Neighbor Set Pilot Record to TD_POWER_LEVEL_r and set the TD_MODE field of NGHBR_PILOT_REC to TD_MODE_r.

– If NGHBR_PILOT_REC_TYPE_r is equal to ‘001’, the mobile station shall

 Set the AUX_PILOT_QOF field of the Candidate Frequency Neighbor Set Pilot Record to QOF_r.

 Set the AUX_PILOT_WALSH_CODE field of the Candidate Frequency Neighbor Set Pilot Record to AUX_PILOT_WALSH_r with the Walsh Code length specified by WALSH_LENGTH_r.

– If NGHBR_PILOT_REC_TYPE_r is equal to ‘010’, the mobile station shall:

 Set the AUX_PILOT_TD_QOF field of the Candidate Frequency Neighbor Set Pilot Record to QOF_r.

 Set the AUX_PILOT_TD_WALSH_CODE field of the Candidate Frequency Neighbor Set Pilot Record to AUX_TD_WALSH_r with the Walsh Code length specified by WALSH_LENGTH_r.

 Set the AUX_TD_POWER_LEVEL field of the Candidate Frequency Neighbor Set Pilot Record to AUX_TD_POWER_LEVEL_r.

 Set the TD_MODE field of the Candidate Frequency Neighbor Set Pilot Record to TD_MODE_r.

 If PILOT_UPDATE is equal to ‘1’ and CF_SEARCH_PRIORITY_INCL_s is equal to ‘1’, the mobile station shall store the search priority (SEARCH_PRIORITY_s = SEARCH_PRIORITY_r) associated with each of the neighboring base stations contained in the Candidate Frequency Neighbor Set.

 If PILOT_UPDATE is equal to ‘1’ and CF_SRCH_WIN_NGHBR_INCL_s is equal to ‘1’, the mobile station shall perform the following:

à Store the neighbor pilot channel search window size (SRCH_WIN_NGHBR_s = SRCH_WIN_NGHBR_r) associated with each of the neighboring base stations contained in the Candidate Frequency Neighbor Set,

à If CF_SRCH_OFFSET_INCL_r equals to ‘1’, store the neighbor pilot channel search window offset (SRCH_OFFSET_NGHBR_s = SRCH_OFFSET_NGHBR_r) associated with each of the neighboring base stations contained in the Candidate Frequency Neighbor Set.

 If PILOT_UPDATE is equal to ‘1’, the mobile station shall replace the Candidate Frequency Search Set with all flagged pilots (those with the corresponding SEARCH_SET field set to ‘1’) specified in the Candidate Frequency Search Request Message.

 Search offset time (SEARCH_OFFSET_s = SEARCH_OFFSET_r)

+ If ALIGN_TIMING_r is equal to ‘1’ and the mobile station will align its search as requested by the base station, the mobile station shall set ALIGN_TIMING_USED_s to ‘1’; otherwise, the mobile station shall set ALIGN_TIMING_USED_s to ‘0’.

+ If the mobile station uses power control groups as the unit of delay, it shall set SEARCH_TIME_RESOLUTION_s to 0.00125; otherwise, it shall set SEARCH_TIME_RESOLUTION_s to 0.02.

+ 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)

+ If SEARCH_TYPE_r is equal to ‘01’, the mobile station shall perform a single search of the Candidate Frequency Search Set, as described in 2.6.6.2.8.3.1. If SEARCH_TYPE_r is equal to ‘11’, the mobile station shall perform the periodic search procedures, as described in 2.6.6.2.8.3.2.

NGHBR_SRCH_-MODE CF_NGHBR_-SRCH_MODE	SEARCH_-PRIORITY_INCL CF_SEARCH_-PRIORITY_INCL	SRCH_WIN_-NGHBR_INCL CF_SRCH_-WIN_NGHBR_INCL
00	0	0
01	1	0
10	0	1
11	1	1

If SEARCH_MODE_r is equal to ‘0001’, and if the mobile station supports analog searching, the mobile station shall process the Candidate Frequency Search Request Message as follows:

• The mobile station shall send a Mobile Station Reject Order with the ORDQ field set to ‘0001101’ (search period too short), if SEARCH_TYPE_r is equal to ‘11’ and search_period is less than (max (fwd_time, rev_time ) + T_71m) seconds where search_period, fwd_time and rev_time are defined below.

(In the following, rec_search_set is the set of analog frequencies specified in the Candidate Frequency Search Request Message.)



search_period = time period corresponding to SEARCH_PERIOD_r shown in
Table 2.6.6.2.8.3.2-1

fwd_time = the mobile station’s estimate of the total length of time, in seconds, for which the mobile station will need to suspend its current Forward Traffic Channel processing in order to tune to each analog frequency in rec_search_set and measure its strength, and to re-tune to the Serving Frequency; if the mobile station searches rec_search_set in multiple visits, fwd_time is the total time for all visits away from the Serving Frequency in a search period (see 2.6.6.2.10.2)

rev_time = the mobile station’s estimate of the total length of time, in seconds, for which the mobile station will need to suspend its current Reverse Traffic Channel processing in order to tune to each analog frequency in rec_search_set and measure its strength, and to re-tune to the Serving Frequency; if the mobile station searches rec_search_set in multiple visits, rev_time is the total time for all visits away from the Serving Frequency in a search period


Directory: TSGC -> Working
Working -> 2section (Continued) 6 Layer 3 Processing
Working -> 3gpp2 tsg-c wg 2 swg 3 meeting #40 Meeting Summary
Working -> C14-20050516-007 3gpp2 swg 4 title
Working -> Radiocommunication Study Groups



Download 1.98 Mb.

Share with your friends: