wcdma release roadmap

1 Nokia Siemens Networks Confidential

Nokia Siemens Networks WCDMA Release Roadmap


RU20


HSDPA 42 Mbps (Dual-Cell HSDPA + 64QAM)

RU20

Feature ID(s): RAN1906

HSDPA peak rates up to 42 Mbps User rate and capacity gains up to 100%

In Dual-Cell HSDPA one UE can be allocated HSDPA channels from two adjacent carriers

Dual-Cell HSDPA with 64QAM allows bit rates up to 42 Mbps

Compared to 21 Mbps HSDPA

Dual-Cell HSDPA user rate gain 100% in low load (double spectrum)

Dual-Cell HSDPA capacity gain 20% in full load (improved scheduling)

In real networks clearly above 20% capacity gain depending on the traffic profile

Gains are achieved also at cell edge

Scheduling gain comes from de-correlation of fading on both frequencies

Single Flexi RF Module Triple supports configuration of Dual-Cell HSDPA 2+2+2 (70W /sector)

Two parallel carriers for Dual-Cell

2 x 5 MHz 1 x 5 MHz

Uplink Downlink

I-HSPA Rel.3


HSDPA 21 Mbps (64QAM)

Higher HSDPA peak rates up to 21Mbps


64QAM improves throughput of UEs with good downlink channel

Minor gain in average rate and cell capacity *): 5%-10% in loaded network

~15% in low other cell interference (e.g. microcell)

Dual receiver UEs have better performance with 64QAM

*) Capacity gains assume 100% 64QAM UE penetration. Full buffer traffic model.

64QAM cell throughput gain in comparison to 15 codes 16QAM

0

2

4

6

8

10

12

14

PedA 3 km/h VehA 3 km/h Micro (6 dB isolation)

%

1-Rx Equalizer

2-Rx Equalizer

RU20 I-HSPA Rel.3


MIMO 28 Mbps RU20 I-HSPA Rel.4

MIMO increases user peak rates up to 28 Mbps


MIMO (Multiple Input - Multiple Output):

Multipath propagation is harnessed to send two parallel data streams

2x2 MIMO peak rate is 28Mbps with 16QAM

High rates require good radio conditions and multipath

Network level gains require significant MIMO terminal base

+

+

Coding, spreading

Coding, spreading

Base station UE

2 antennas & MIMO decoding capability

Transmitter with 2 branches per sector

Feedback weights from UE

28 Mbps

Demux

14 Mbps

14 Mbps


HSUPA 5.8Mbps

Feature ID(s): RAN981, RAN1470

HSUPA peak rate is increased up to 5.8Mbps/user 2ms TTI on the air interface and Iub

HSUPA 2 ms TTI decreases latency at least by 12 ms

Enables HSPA latency evolution to below 30 ms

Increased HSUPA peak rate and decreased latency

1 x SF4 0.71 Mbps

# of codes 10 ms

2 x SF4 1.45 Mbps

1

UE category

2

3

4

5

2 x SF4 1.45 Mbps

2 x SF2 2.0 Mbps

2 x SF2 2.0 Mbps

6 2 x SF2

+ 2 x SF4 2.0 Mbps

-

2 ms

-

1.45 Mbps

2.8 Mbps

-

5.8 Mbps

Max L1 data rate/user

RU20 I-HSPA Rel.3


Flexible RLC (DL)


0%

5%

10%

15%

20%

25%

30%

35%

40%

45%

50%

0 500 1000 1500

IP packet size

Release 6 RLC (40-B RLC packet)

Release 7 RLC (Flexible RLC)

Throughput gain Less packet processing

RLC overhead

RLC PDU size is determined based on the RLC SDU size, i.e. IP packet

No RLC layer padding needed

5-10% throughput gain expected from the reduced RLC overhead

Less RLC processing both in UE and network side for all HSDPA bit rates

RLC

MAC-hs

IP packet 1500B

Node B

RNC PDCP

RLC packet 40B

3GPP Rel-6

RLC

MAC-ehs

IP packet 1500B PDCP RLC packet size flexible up to 1500B

3GPP Rel-7

Transport block size depending on scheduling

Transport block size depending on scheduling

RU20 I-HSPA Rel.3


Continuous Packet Connectivity

Longer battery life, higher capacity and better user experience


Continuous Packet Connectivity (CPC) includes Uplink DPCCH gating: major gain in UL cell throughput with high user amounts, major

gain in UE battery life, CS over HSPA enabler

Downlink DRX : additional gain in UE battery life (F-DPCH required)

Lower mobile power consumption Higher capacity due to less interference transmitted Benefits both voice and data over HSPA

HSPA R6 data

HSPA R7 data with CPC

UL DPCCH

HS-DSCH

UL DPCCH

HS-DSCH

Web page download

Break in data transmission

UL DTX when data transfer stops

Voice over HSPA with CPC

WCDMA R99 CS voice DPCCH

DPDCH

20 ms

E-DPCH

DPCCH

UL DTX between speech frames

RU20 I-HSPA Rel.3


CS Voice over HSPA RU20


I-HSPA Rel.4

50% increase in UE talk time, 50% faster call set-ups, 50% more radio capacity Compared to CS voice over DCH

CS voice over HSPA impacts only RAN: HSPA transport channels carry CS voice Uplink gating and downlink DRX are used according to Release 7 Continuous

packet connectivity (CPC)

No changes to voice ecosystem: CS core, roaming, charging, etc. remain the same Smooth inter-working between 2G and 3G with existing CS inter-system handover

MSC

-S

MG

W

PSTN

RN

C

Today

RAN: CS voice over

HSPA

CS voice over

HSPA

CN: R99 or R4

CS solution

RAN: CS voice over

DCH

Iu-CS CN: R99 or R4

CS solution

No changes to core network. CS

core is not aware of RAN internal

transport channel mapping

CS voice is carried over

HSPA packet bearers in the

radio access network

No changes to

Iu-CS interface


Fractional DPCH


Fractional DPCH shares the DL dedicated code channel carrying L1 signaling (TPC bits) of HSDPA users

DL L1 signaling of up to 10 HSDPA users are multiplexed on the same code channel

HSDPA throughput can be increased Highest gains in case of high number of users (e.g. >60-80 voice on HSPA users)

Without F-DPCH, 15 codes available for HS-PDSCH only when 1 or 2 HSDPA users in the cell

Less control overhead in DL

Increased HSDPA throughput

Slot 0.667 ms = 2/3 ms

TPC

DPCCH

Pilot Data TPC

DPDCH DPDCH

Data

DPCCH DPCCH

TFCI DPCH Slot

F-DPCH Slot TX OFF TX OFF

RU20 I-HSPA Rel.3


Fast Dormancy (Rel8) RU20


Fast Dormancy is an optional feature in 3GPP Rel8 for UEs

UEs supporting this feature can be controlled by network and yet save batteries

New release cause for Signaling Connection Release Indication message can be used by UEs to indicate that active PS data transfer has concluded

Upon reception of this message the RNC triggers state transition to Cell_PCH instead of letting the UE to go to idle mode

URA_PCH state can be selected for fast moving UEs

Cell_PCH has a very low battery consumption, comparable to idle state

HSPA setup from Cell_PCH to Cell_DCH is faster and requires much less signaling compared to starting from idle state

Reduced signaling load and faster packet call setups


Thank you.

wcdma release roadmap

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