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LTE-cdma2K 1x/eHRPD Idle Reselection Solutions

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LTE-cdma2K 1x/eHRPD Idle Reselection Solutions. Load balancing between eHRPD and E-UTRAN. Background Requirement from China Telecom at Nanjing meeting, refer to [C22-20120206-020 CT-Requirement for loading balance between eHRPD and E-UTRAN]. 2. Proposal.

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load balancing between ehrpd and e utran
Load balancing between eHRPD and E-UTRAN
  • Background
    • Requirement from China Telecom at Nanjing meeting, refer to [C22-20120206-020 CT-Requirement for loading balance between eHRPD and E-UTRAN].

2

proposal
Proposal
  • A new attribute UEClass is proposed.
    • UEClass is created from subscription data or operator/vendor-based policy.
    • UEClass is sent to UE by AN via UEClass attribute during eHRPD session negotiation
  • eAN obtains each UE’s UEClass in following ways
    • Through Inter-User Priority parameter from 3GPP2 AAA
    • Or from other parameters sent from 3GPP MME
  • When network detects its loading problem:
    • eNB broadcasts inter-RAT reselection rules using UEClass bitmap to the UEs through overhead signaling

3

proposal cont
Proposal (cont’)
  • If UEClass bitmap is provided by eAN, AT will perform the followings:
    • If AT finds its assigned UEClass is directed to stay in eHRPD by eAN, then the AT puts eHRPD ServingPrioirty as highest and overrides LTE priority and follows existing reselection procedure
    • If AT finds its assigned UEClass is directed go to LTE by eAN, then the AT ignores eHRPDServingPriority and follows existing reselection procedure
    • Otherwise, if UEClass bitmap is not provided, then AT follows existing reselection procedure with the parameters defined in OtherRATNeighborList message

4

ueclass bitmap format
UEClass Bitmap Format

Bit 2

Bit 1

Bit 3

Bit 5

Bit 4

Bit 6

Bit 13

UEClass 8 indicator

… …

UEClass1 indicator

Random Reselection indicator for UATI%10=0,1

Random Reselection indicator for UATI%10=2,3

Random Reselection indicator for UATI%10=4,5

Random Reselection indicator for UATI%10=6,7

Random Reselection indicator for UATI%10=8,9

  • Assume the total UEClass number is 8, bits 13~6 are part 1 (YELLOW): UEClass reselection indicator
    • Bit 13=0 means eAN directs ATs of UEClass8 stay in eHRPD
    • Bit 13=1 means eAN directs ATs of UEClass8 go to EUTRAN
    • Bits 12~6 follow the same way for UEClass7~1
  • Bits 5~1 are part 2 (BLUE): Random reselection indicators.
    • Together with part1 bits, part 2 bits are used to further specify which types of IMSIs are selected (associated bits set to ‘1’) for the UEClass randomization.
  • UEs without assigned UEClass or assigned UEClass but corresponding random reselection indicators w/ ‘0’ will follow existing reselection procedure
ueclass format examples
UEClass Format Examples

LSB

MSB

Bit 4

Bit 4

Bit 1

Bit 1

Bit 3

Bit 3

Bit 5

Bit 2

Bit 5

Bit 2

Bit 6

Bit 6

Bit 13

Bit 13

UEClass8

1

UEClass8

1

….

UEClass1

0

1

0,1

1

2,3

0

4,5

1

6,7

1

0

8,9

UEClass1

0

1

1

1

1

  • Example 1: All UEs in UEClass 8 go to EUTRAN, UEs in UEClass 1 stay in eHRPD, w/o randomization
  • Example 2: UEs in UEClass8 will go to EUTRAN with randomization, UEs in UEClass1 will stay in eHRPD with randomization. UEs with UATI%10=0,1,2,3,6,7 are selected; UEs with UATI%10=4,5,8,9 will follow existing reselection procedure
inter rat reselection when ueclass bitmap is provided call flow
Inter-RAT reselection when UEClass Bitmap is provided(Call Flow)

AT1

AT2

E-UTRAN

eHRPD

eHRPD Session Negotiation with AT1(UEClass=k)

eHRPD Session Negotiation with AT2 (UEClass=m)

AT1 is in eHRPD idle state

AT2 is in eHRPD idle state

Broadcast InterRATLoad infor

(UEClassBitmap exists, UEClassk=0, UEClassm=1)

AT1 stays in eHRPD

AT2 goes to E-UTRAN

inter rat reselection when ueclass bitmap is not provided call flow
Inter-RAT reselection when UEClass Bitmap is not provided(Call Flow)

AT1

AT2

E-UTRAN

eHRPD

eHRPD session Negotiation b/w eAN and AT1(UEClass=k)

eHRPD Session Negotiation b/w eAN and AT2 (UEClass=m)

AT1 is in eHRPD idle state

AT2 is in eHRPD idle state

Broadcast InterRATLoadinfor (No UEClass Bitmap)

AT1 and AT2 follow existing reselection procedure and may stay in eHRPD

AT1 and AT2 follow existing reselection procedure and may switch to E-UTRAN

summary
Summary
  • Load balancing between LTE and eHRPD can be achieved through the approach defined in this proposal.
  • The negotiation for UEClassbetween AT and AN provides a flexible way to deliver AT’s Inter-RAT load class.
  • UEClass can be obtained either from Inter-user Priority from AAA, or from MME
  • UEClass bitmap can be provided to activate the usage of UEClass when necessary
    • Provides flexible control from the network,
    • Keeps backward compatible with the existing reselection procedures.