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Enhanced ECCLM & EGSRDM: SWG23 Status. Ragulan Sinnarajah Chair, SWG23 Qualcomm Incorporated [email protected] 1/11/05. Introduction. Various proposals received in SWG23 to enhance current ECCLM & EGSRM procedures

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enhanced ecclm egsrdm swg23 status

Enhanced ECCLM & EGSRDM:SWG23 Status

Ragulan Sinnarajah

Chair, SWG23

Qualcomm Incorporated

[email protected]

1/11/05

1

introduction
Introduction
  • Various proposals received in SWG23 to enhance current ECCLM & EGSRM procedures
    • Enhanced mechanisms to selectively distribute mobiles to different band/frequency, without performance degradation
    • See last slide for contribution list
  • Multi-band/band subclass deployments may become more common place
  • New mobiles support multiple bands/band subclasses

2

current mechanism
Current Mechanism
  • Paging channel assignment
    • Can be used to direct an MS to a paging channel on a different band/frequency
    • Limitations: Has to be done individually for each MS
  • Traffic channel assignment
    • Can be used to assign an MS to a traffic channel on a different band/frequency
    • Limitations: Has to be done individually for each MS
  • Extended CDMA Channel List Message (ECCLM)
    • Broadcast message used to distribute mobiles across different frequencies within same band based on limited set of MS capabilities
    • Limitations: only intra-band, limited controls, only uniform distribution
  • Extended Global Service Redirection Message (EGSRDM)
    • Broadcast message used to redirect mobiles to different frequency/band based on limited set of MS capabilities
    • Limitations: only single redirection, limited controls, must go through system determination (delay)

3

proposed enhancements to ecclm
Proposed Enhancements to ECCLM
  • Allow non-uniform distribution: Weight-based hashing
    • In ECCLM, optionally add a new parameter “frequency weight” for each frequency to indicate the weight associated with that frequency
    • These weights are taken into account when hashing: larger weight  higher probability of hashing to that frequency
  • Allow Inter-band hashing
    • In ECCLM, optionally add band class & band subclass parameter to each frequency listed
    • MS can hash to a frequency on different band subclass or bandclass
      • Allow MS to go directly to idle state
        • Reduces number of hops to idle in new band/frequency

4

proposed enhancements to ecclm1
Proposed Enhancements to ECCLM ..
  • Allow Inter-band hashing ..
    • Issue: MS may not support all bands or band subclass included in ECCLM. MS needs to skip over these to pick a frequency. How does BS know which ones MS skipped over?
      • In each registration, MS includes list of all bands/band subclasses support
        • same logic as QPCH/RC/TD support
      • BS signals in overhead which bands/band subclass deployed in that sector. In each registration, MS indicates which ones out the BS list the MS supports
      • Network queries the band/band subclass capability info rec via status request and MSC passes that info down to each BSC when sending a message to MS
      • Keep the current requirement that MS must register (power up registration) whenever it changes band or band subclass

5

proposed enhancements to egsrdm
Proposed Enhancements to EGSRDM
  • Allow multiple redirection records in EGSRDM
    • Multiple redirections can be performed in parallel
    • Need to define rule for MS action
      • Ex. Act upon the first applicable record
  • Allow MS to go directly to Idle State on redirected band/frequency
    • Same as in Enhanced ECCLM
  • Allow MS to remain in current freq if MS does not support any of the bands in EGSRDM
    • Based on a flag; otherwise, MS must leave and look for another system
    • Bug in current standard?
  • Allow MS to ignore EGSRDM for a specified duration if MS couldn’t acquire the band being re-directed

6

next steps
Next steps
  • Decide which enhancements group wants to make in Rev D Addendum
  • Assignment to companies to write stage 3 text for agreed upon enhancements

7

contribution list
Contribution List
  • C23-20040823-009 --- Enhancement to Inter-Band Registration Procedures, Lucent
  • C23-20041018-002 --- Inter-Band Load Balancing, Lucent/Nortel
  • C23-20041018-013 --- Clarification of Zone Based Registration fields in Mobile Station Registered Message, Lucent
  • C23-20041018-014 --- Service Redirection Loop in Multi-Band Network through Soft Redirection, Lucent
  • C23-20041018-014A --- Soft Service Redirection Techniques, Lucent
  • C23-20041018-015 --- Support for ALT_BAND_CLASS_SUP in RGM and RCNM, Lucent
  • C23-20041206-006 --- Responses to Questions on Inter-Band Hashing and Soft Redirection, Lucent
  • C23-20041206-007 --- Support for Band Class Bitmap in RGM and RCNM, Lucent
  • C23-20041206-008 --- “Service Redirection Bug Fix”, Motorola

8

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