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這個(gè)問題我來回答：
標(biāo)準(zhǔn)里是這樣說的 ：
2-461
• The mobile station shall cancel any remaining visits away from the Serving
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Frequency in the current search period and shall not send a Candidate Frequency
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Search Report Message for the current search period.
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• The mobile station shall disable the periodic search timer.
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• The mobile station may stop maintaining the average of the Serving Frequency
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received power that is used in the handoff and search procedures.
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2.6.6.2.11 Processing of Reverse Supplemental Code Channels and Reverse Supplemental
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Channels
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If USE_T_ADD_ABORTs is set to ‘1’, and the strength of a Neighbor Set or Remaining Set
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pilotisfoundtobeaboveT_ADDs,thenthemobilestationshallterminateanyactive
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transmission on Reverse Supplemental Code Channels or Reverse Supplemental Channels
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at the end of the current 20 ms frame.The mobile station shall do the following:
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• Any previously active Reverse Supplemental Code Channel or Reverse Supplemental
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Channel assignment shall be considered implicitly terminated.
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• If active transmission on Reverse Supplemental Code Channels is terminated, the
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mobile station shall set NUM_REV_CODESs to ‘000’ and shall set IGNORE_SCAMs
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to ‘1’.
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• If active transmission on Reverse Supplemental Channels is terminated, the mobile
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station shall set IGNORE_ESCAMs to ‘1’.
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• The mobile station shall set SCRM_SEQ_NUMs to (SCRM_SEQ_NUMs + 1) mod 16.
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• The mobile station shall transmit a Supplemental Channel Request Message with
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USE_SCRM_SEQ_NUM set to ‘1’, SCRM_SEQ_NUM set to SCRM_SEQ_NUMs, and
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SIZE_OF_REQ_BLOB set to ‘0000’.
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2.6.6.2.12 Periodic Serving Frequency Pilot Report Procedure
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WhilethemobilestationistunedtotheServingFrequency(specifiedbyCDMACHsand
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CDMABANDs),Tthemobilestationshallcontinuouslymeasurethetotalreceivedpower
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spectraldensity,inmW/1.23MHz,ontheServingFrequencyatleastonceevery20ms
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frame. (0.02 seconds) and The mobile station shall maintain the average value of the total
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receivedpowerspectraldensity,spec_density,overthelastN12mframes. Themobile
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station shall maintain the PPSMM timer as follows:
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• When the mobile station starts a Periodic Serving Frequency Pilot Report Procedure,
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it shall set the PPSMM timer to PPSMM_PERIODs × 0.08 seconds and shall enable
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the timer.
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• When the PPSMM timer expires, the mobile station shall send a Periodic Pilot
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Strength Measurement Message (2.6.6.2.5.2) to the base station, reset the PPSMM
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timer to PPSMM_PERIODs × 0.08 seconds and shall re-enable the timer.
C.S0005-A-1
2-462
• When the mobile station receives an Extended Handoff Direction Message , a General
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Handoff Direction Message or a Universal Handoff Direction Message directing the
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mobile station to perform a hard handoff (see 2.6.6.2.5.1), it shall abort the Periodic
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Serving Frequency Pilot Report Procedure and disable the PPSMM timer if it is
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enabled.
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• If MIN_PILOT_PWR_THRESHs is not equal to ‘11111’ and
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MIN_PILOT_EC_IO_THRESHs is equal to ‘11111’, the mobile station shall perform
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the following actions once per frame:
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– Disable the PPSMM timer if the received total energy per PN chip, Ec, of the
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pilots in the Active Set is not less than (-120 + 2 MIN_PILOT_PWR_THRESHs),
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where the value of Ec is computed as 10 × log10 (PS × spec_density) and PS is
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the total Ec/Io of the pilots in the Active Set measured as specified in 2.6.6.2.2.
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– Reset the expiration time of the PPSMM timer to PPSMM_PERIODs × 0.08
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seconds and re-enable the timer if the following conditions are true:
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οthe PPSMM timer is disabled, and
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οthe received total energy per PN chip, Ec, of the pilots in the Active Set is less
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than (-120 + 2 × MIN_PILOT_PWR_THRESHs).
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• If MIN_PILOT_PWR_THRESHs is equal to ‘11111’ and MIN_PILOT_EC_IO_THRESHs
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is not equal to ‘11111’, the mobile station shall perform the following actions once
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per frame:
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– Disable the PPSMM timer if the total pilot strength of the pilots in the Active Set,
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PS, satisfies the condition that (-20 × log10(PS)) is not greater than
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MIN_PILOT_EC_IO_THRESHs.
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– Reset the expiration time of the PPSMM timer to PPSMM_PERIODs × 0.08
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seconds and re-enable the timer if the following conditions are true:
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οthe PPSMM timer is disabled, and
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οthe total pilot strength of the pilots in the Active Set, PS, satisfies the
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condition that (-20 × log10(PS)) is greater than MIN_PILOT_EC_IO_THRESHs.
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• If MIN_PILOT_PWR_THRESHs is not equal to ‘11111’ and
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MIN_PILOT_EC_IO_THRESHs is not equal to ‘11111’, the mobile station shall
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perform the following actions once per frame:
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– Disable the PPSMM timer if the following conditions are true:
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οthe received total energy per PN chip, Ec, of the pilots in the Active Set is not
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less than (-120 + 2 × MIN_PILOT_PWR_THRESHs), and
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οthe total pilot strength of the pilots in the Active Set, PS, satisfies the
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condition that (-20 × log10(PS)) is not greater than
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MIN_PILOT_EC_IO_THRESHs.
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– Reset the expiration time of the PPSMM timer to PPSMM_PERIODs × 0.08
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seconds and re-enable the timer if the following conditions are true:
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C.S0005-A-1
2-463
οthe PPSMM timer is disabled, and
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οthe received total energy per PN chip, Ec, of the pilots in the Active Set is less
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than (-120 + 2 × MIN_PILOT_PWR_THRESHs), or the total pilot strength of
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the pilots in the Active Set, PS, satisfies the condition that (-20 × log10(PS)) is
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greater than MIN_PILOT_EC_IO_THRESHs.
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• If MIN_PILOT_PWR_THRESHs is equal to ‘11111’ and MIN_PILOT_EC_IO_THRESHs
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is equal to ‘11111’, the mobile station shall maintain the PPSMM timer independent
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of the received power and the total Ec/Io of the pilots.
不多說了我們大家可以這樣理解：一般現(xiàn)在廠家有些做跨頻切換時(shí)候或其他硬切換的時(shí)候會(huì)采用這條消息并且設(shè)置TIME=PPSMM_PERIODs × 0.08 seconds
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