2. section (Continued) 6 Call Layer 3 Processing
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- 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’
- 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’
- 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’
- 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’
2.6.6.3 ExamplesThe 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_USEs is less than or equal to three or SOFT_SLOPEs 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_USEs is greater than three and SOFT_SLOPEs 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_USEs is less than or equal to three, or SOFT_SLOPEs 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_USEs is greater than three and SOFT_SLOPEs 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_USEs is Less Than or Equal to Three, or SOFT_SLOPEs 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.
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_USEs = 3 or SOFT_SLOPEs = ‘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_USEs > 3 and SOFT_SLOPEs is Not Equal to‘000000’ 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:
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