HSUPA Presentation
description
Transcript of HSUPA Presentation
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LR15.2 feature 111583 – Dual Carrier HSUPA
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Agenda
Feature Overview
What Spec says ?
Feature Technical Description
Feature Implementation in ALU
Drawbacks and Recommendations
Customer Requirements
EPIC
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Feature Overview
Rel’8 feature co-existing with DC HSDPA in DL
2 E-DCH carriers 1) Primary and 2) Secondary carriers
UL data transmitted in 2 adjacent 5 MHz carriers – Dual cell operation
Data rate gets doubled as Bandwidth is doubled (10MHZ)
Always in dedicated mode for PS
Independent E-DCH scheduling
Rel’8 UE with one or two amplifiers accordingly
High data rates and capacity gain
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What Spec says ?
Physical layer configuration
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Physical layer configuration Cont…….
• Support of 2ms TTI
• DL and UL Power control performed on each carrier
• HS-DPCCH present only on Primary carrier
• For corresponding UL, there exists E-AGCH, E-RGCH, E-HICH and F-DPCH in DL
• Each E-DCH transport channel has its corresponding UL and DL signaling
• HS-SCCH orders are used to ACT/DACT Secondary in both UL and DL and are mutually exclusive
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MAC and RLC Layer configuration• Mac-i/is supported
• In UE, MUXing and TSN are common to both the carriers except HARQ
• Mac-I does HARQ, De-MUX in nodeB while Mac-is does Re-ordering
• Flexible RLC is supported in UL and DL
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Scheduling mechanism
Scheduled transmissions can be sent on both the UL carriers
Resources allocation is done on both the carriers through AG and RG
One primary E-RNTI and one Secondary E-RNTI per configured Freq
Happy bits are transmitted per ACT. UL Freq
TSIG and T_SING timers are used by UE during Periodic Scheduling
UE shall not hold the AG/RG once the secondary carrier is DACT
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RRC layer configuration
• Both carriers maintain an Independent E-DCH Active set and R99 Active set as well
• UE shall perform the Intra frequency measurements with events 1A,1B,1C, 1D etc
• Both the carriers should belong to the same nodeB
• RL failure and Physical channel failure are dealt as in Rel8 and secondary carrier is deactivated up on encountering this
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Feature Implementation in ALU
Baseband board: eCEM or eCEM-U with schedulers being hosted in the same board
Controller board: xCCM/E1 MDA or xCCM/GE MDA or eCCM
NIP Iub is the first priority, Hybrid Iub is the second priority, pure ATM interface is not required
RF : same as DC-HSDPA in 2100 MHz band
RNC : DCPS or eDCPS
Available on both MBA (3C-HSDPA) and SBA (Modem capable of supporting 2 carriers)
In MBA, DL can be either 3C or DC, but in UL there is a restriction for DC-HSUPA w.r.t UL Max Bitrates. If the usage is below the threshold, DC UL can’t be sued
Users are selected based on TC/ARP/THP
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Drawbacks and Recommendations
Drawbacks:
Doubles the Baseband consumption in terms of CE and E-DCH connections
Throughput degradation at Cell-Edge
Cell radio capacity decrease due to power overhead induced by secondary carrier
Higher control plane load induced at RNC and NodeB due to independent E-DCH active set on both carriers
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Drawbacks and Recommendations cont…….
Recommendations:
Limit the no. of secondary carriers per user (configurable N<=4)
Secondary activated only if the UE has higher UL activity and is not power limited
Serving NodeB initiates secondary cell activation or deactivation by making use of HS-SCCH orders which ensures 15 DC HSUPA calls can be configured with DC-HSUPA per eCEM with atmost 4 being given secondary carrier
RNC has no view of resource allocation till LR15. So RNC gets an error from NodeB if it tries to allocate resources for more than 15 DC HSUPA calls per modem
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Customer RequirementsRequirement ALU Response
Support of 15 DC-HSUPA calls with 4 secondary carriers per eCEM
Partially compliant
NodeB and RNC should support required configuration in 2100MHZ band Compliant
User regression TPUT and Cell radio capacity decrease should be prevented when the UE is power limited
Dynamic HS-SCCH ACT/DACT not done in PH1
Cell capacity optimization by ACT/DACT of Dual carrier Dynamic HS-SCCH ACT/DACT not done in PH1
2 E-DCH connections should be considered for UE configured with DC-HSUPA i.e., in MBA, one E-DCH resource taken from each modem
Compliant
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General Requirement ALU Response
Mobility procedures w.r.t iMCTA, Reconfigurations (DC <-> SC) during SHO
Compliant
User priority based on TC/ARP/THP and UL MBR Compliant
Soft Congestion interaction Dependency on the same
3C-HSDPA interaction Not considered in PH 1
Performance and capacity Requirement ALU Response
TPUT in case of Single user and multi users (to be completed) in good radio conditions
Compliant
TPUT in case of single user in Live Environment with no traffic load and at the cell centre
Compliant
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EPICPriority EPIC name
P0 DC-HSUPA support on both MBA and SBA
P1 Dynamic activation and de-activation of Dual carrier
P1 Access to DC-HSUPA according to user priority
P2 DC-HSU / Soft congestion interworking
P3 DC-HSU / 3C-HSDPA interworking
P4 Lower priority DC-HSUPA scenarios a)Hybrid IuB
b)DC-HSUPA specific iMCTA c)Incoming relocation in DC-HSUPA
d)RRE in DC-HSUPA