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SIMCom DSDS Solution Introduction The global leading provider of M2M wireless module

SIMCom DSDS Solution Introduction The global leading provider of M2M wireless module. September, 2012. DSDS Overview. DSDS = Dual SIM Dual Standby Single modem (1BB / 1RF ) managing 2 SIMs Idle Services on both SIM in parallel (paging reception, reselection..)

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SIMCom DSDS Solution Introduction The global leading provider of M2M wireless module

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  1. SIMCom DSDS Solution Introduction The global leading provider of M2M wireless module September, 2012

  2. DSDS Overview • DSDS = Dual SIM Dual Standby • Single modem (1BB / 1RF ) managing 2 SIMs • Idle Services on both SIM in parallel (paging reception, reselection..) • Cell selection/reselection on the 2 SIMs • Paging monitoring on 2 SIMs • Ability of doing CS/PS call on any of the 2 SIMs • BUT only 1 connection (CS/PS) at a time AND no activity on other SIM possible (neither idle nor connected) • When 1 SIM enters CS/PS call => no activity on other SIMs • MT call on second SIM not possible • MO call on second SIM not possible (ie double call feature not possible) • To sum up => Dual SIM, Dual Standby but Single Call

  3. Hardware Overview • Only 2 SIM connectors are required

  4. Software Architecture Overview

  5. Software Architecture Overview • Single L1 managing services for both HL stack • protocol stack duplicated • New module creation for Hw SIM swap management —DSCV • Suspend-Resume mechanism in case of concurrent procedure —DSUAL

  6. AT Interface • AT*PSSDS (Select default SIM) • Set SIM_x into Default SIM • Clarification: If there are 2 SIMs, then the SIM1 is identified by value 1 and SIM2 is identified by value 2. If there is one SIM then default SIM is the only SIM present

  7. Use Cases • Outgoing call on Default SIM: No Change • By default, usual AT commands are routed to default SIM

  8. Use Cases • Outgoing call on Non Default SIM • Non Default SIM selection is needed before each command

  9. Use Cases • Incoming call on Non-Default SIM

  10. Usage Summary • No extra Hardware Circuit • Simple AT command to change default SIM card • SIM URCs on the non-default SIM are appended with “DS” to indicate TE that this URC is from the non-default SIM • Incoming call notification from Default SIM: RING • Incoming call notification from Non Default SIM: RINGDS

  11. Thank you!

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