1 Enhanced ECCLM & EGSRDM: SWG23 Status Ragulan Sinnarajah Chair, SWG23 Qualcomm Incorporated 1/11/05

2 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

3 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)

4 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

5 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

6 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

7 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

8 Contribution List C Enhancement to Inter-Band Registration Procedures, Lucent C Inter-Band Load Balancing, Lucent/Nortel C Clarification of Zone Based Registration fields in Mobile Station Registered Message, Lucent C Service Redirection Loop in Multi-Band Network through Soft Redirection, Lucent C A --- Soft Service Redirection Techniques, Lucent C Support for ALT_BAND_CLASS_SUP in RGM and RCNM, Lucent C Responses to Questions on Inter-Band Hashing and Soft Redirection, Lucent C Support for Band Class Bitmap in RGM and RCNM, Lucent C “Service Redirection Bug Fix”, Motorola