Carrier Aggregation. (one) Key Enabler for LTE-Advanced. Andreas Roessler. Meik Kottkamp

Transcription

1 Carrier Aggregation (one) Key Enaber for LTE-Advanced Andreas Roesser Technoogy Manager Rohde & Schwarz America Meik Kottkamp Technoogy Manager Rohde & Schwarz Germany

2 LTE = status 4G? No! Q2/2012: 27.6 miion LTE subscriptions wordwide Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 2

3 Why LTE as of today is not 4G? IMT-Advanced Requirements IMT-Advanced LTE 3GPP Re.8 LTE-Advanced 3GPP Re.10 Transmission bandwidth (MHz) 40 / 100 MHz Peak data rate (DL/UL) (Mbps) 1000 (ow mobiity) 100 (high mobiity) 300/ /500 Peak spectra efficiency (bps/hz) Latency (ms) DL (4x4/8x8) 15/- 15/- 16/30 UL (2x2/4x4) /16.8 (FDD) 8.1/16.1 (TDD) User pane <10 <6 <6 Contro pane < Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 3

4 Carrier aggregation: types, motivation Two or more component carriers are aggregated in LTE-Advanced in order to support bandwidths up to 100 MHz. Support of contiguous and non-contiguous component carrier aggregation (intra-band) and inter-band carrier aggregation. Intra-band contiguous Different bandwidths per component carrier (CC) are possibe. Frequency band A Frequency band B Each CC imited to a max. of 110 RB using the 3GPP Re-8 numeroogy (max. 5 carriers, 20 MHz each). TDD: a CC have typicay same UL-DL configuration. Enabes higher peak data rates to meet IMT-Advanced requirements. NWOP: spectrum aggregation, enabing Heterogonous Networks. Component Carrier (CC) Frequency band A 2012 by Rohde&Schwarz Intra-band non-contiguous Frequency band A Inter-band Frequency band B Frequency band B Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 4

5 Specification work in 3GPP RAN4, cont d. Inter-band band combinations (RAN#55) Acronym Mode Work item Work item rapporteur Acronym Mode Work item Work item rapporteur LTE_CA_B3_B7 FDD RP TeiaSonera LTE_CA_B4_B17 FDD RP AT&T LTE_CA_B4_B13 FDD RP Ericsson (Verizon) LTE_CA_B4_B12 FDD RP Cox Communications LTE_CA_B7_B20 FDD RP Huawei (Orange) LTE_CA_B2_B17 FDD RP AT&T LTE_CA_B4_B5 FDD RP AT&T LTE_CA_B3_B5 FDD RP SK Teecom LTE_CA_B4_B7 FDD RP Rogers Wireess LTE_CA_B3_B20 FDD RP Vodafone LTE_CA_B8_B20 FDD RP Vodafone LTE_CA_B11_B18 FDD RP KDDI LTE_CA_B1_B19 FDD RP NTT DoCoMo LTE_CA_B1_B21 FDD RP NTT DoCoMo LTE_CA_B5_B12 FDD RP US Ceuar LTE_CA_B3_B5 with 2 upink FDD RP SK Teecom LTE_CA_B5_B17 FDD RP AT&T LTE_CA_B3_B8 FDD RP KT LTE_CA_B1_B7 FDD RP China Teecom Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 5

6 Primary, secondary component carrier (PCC, SCC) A device capabe of carrier aggregation has 1 DL primary component carrier and 1 associated primary UL component carrier. Basic inkage between DL and UL is signaed in SIB Type 2. Configuration of primary component carrier (PCC) is UE-specific. Downink: ce search / seection, system information, measurement and mobiity. Upink: access procedure on PCC, contro information (PUCCH) on PCC. Network may decide to switch PCC for a device handover procedure is used. Device may have one or severa secondary component carriers. Secondary Component Carriers (SCC) added in RRC_CONNECTED mode ony. Symmetric carrier aggregation. Asymmetric carrier aggregation (= most ikey initia depoyment scenario). Downink Upink SCC SCC SCC PCC SCC SCC SCC SCC PCC SCC PDSCH and PDCCH PDSCH, PDCCH is optiona 2012 by Rohde&Schwarz PUSCH ony PUSCH and PUCCH Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 6

7 Defaut EPS bearer setup (3GPP Re-8) UE EUTRAN Initia access and RRC connection estabishment attach request and PDN connectivity request Additiona information being submitted by a 3GPP Re-10 device Authentication NAS security UE capabiity procedure AS security RRC connection reconfiguration Attach accept and defaut EPS bearer context request Defaut EPS bearer context accept Source: 3GPP TS V10.0.0, section Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 7

8 Carrier Aggregation capabiities of the device What frequency bands, band combination (CA and MIMO capabiities, inter-band, intra-band contiguous and non-contiguous, bandwidth cass does the device support? 2012 by Rohde&Schwarz Carrier aggregation capabiities are signaed separatey for DL, UL. Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 8

9 Bandwidth casses Bandwidth casses = UE (device) capabiity. CA Bandwidth Cass Aggregated Transmission Bandwidth Configuration Maximum number of CC Nomina Guard Band BW GB A N RB,agg BW Channe(1) B N RB,agg FFS C 100 < N RB,agg max(bw Channe(1),BW Channe(2) ) D 200 < N RB,agg [300] FFS FFS E [300] < N RB,agg [400] FFS FFS F [400] < N RB,agg [500] FFS FFS BW Channe(1) and BW Channe(2) are channe bandwidths of two E-UTRA component carriers according to Tabe contiguous Intra-band CA non-contiguous Intra-band CA E-UTRA frequncy band number Inter-band CA CA_1C C CA_25A_25A A A CA_1A_5A1 A A Supported bandwidth cass Source: R Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 9

10 LTE protoco stack entities impacted by carrier aggregation Non-Access Stratum (NAS): UE is connected to the PCe. PCe provides: Security keys at handover. Tracking area for Tracking Area Updates (TAUs). SCe(s) is ony considered as (an) additiona transmission resources. Carrier aggregation is transparent to higher ayers: Packet Data Convergence Protoco (PDCP). Radio Link Contro (RLC) ike Re-8, except higher data rate support. UEs are configured to hande SCes on RRC (3GPP TS ). SCes are (de-)activated by MAC contro eements (3GPP TS ). Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 10

11 RRCConnectionReconfiguration message SCeIndex-r10 = 1, 2,, 7 maximum 4 SCes DL: bandwidth, antennas, MBSFN subframe configuration, PHICH configuration, PDSCH configuration, TDD config (if TD-LTE SCe) UL: bandwidth, carrier frequency, additiona spectrum emission, P-Max, power contro info, upink channe configuration (PRACH, PUSCH) UE-specific information; DL: cross-carrier scheduing, CSI-RS configuration, PDSCH UL: PUSCH, upink power contro, CQI, SRS Source: 3GPP TS V Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 11

12 Activation / Deactivation of SCes Medium Access Contro (MAC) ayer, basic rues Activated SCe: If activation in subframe n, then from subframe n+8 on avaiabiity of: PDCCH (UL grants and DL assignments), SRS, CSI reports, CSI measurements ( n+8), power headroom reporting, SCe deactivation timer is started. Deactivated SCe: If deactivation in subframe n, then operation is stopped in subframe n+8. Activation / Deactivation MAC contro eement (8-bit bitmap) (de-)activates one or more SCes. Automatic deactivation by timer (if no data or PDCCH msg. are received for a certain period). In case of RRC reconfiguration: scedeactivationtimer-r10: 2 n radio frames with n = 1, 2,, 7, inf Incuding mobiity contro information (i.e. a handover) a SCes = deactivated. Without mobiity contro info added SCes = deactivated and remaining SCes = unchanged status. Mechanism for UE power saving. PCes can never be deactivated. Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 12

13 Cross-carrier scheduing Main motivation for cross carrier scheduing: Interference management for HetNet (eicic); oad baancing. Cross carrier scheduing is optiona to a UE. Activated by RRC signaing, if not activated no CIF is present. Component carriers are numbered, Primary Component Carrier (PCC) is aways ce index 0. Scheduing on a component carrier is ony possibe from ONE component, independent if cross-carrier scheduing is ON or OFF: Time Frequency PCFICH PDSCH PDCCH PDCCH Component Carrier #1 Component Carrier #2 not possibe, transmission can ony be schedued by one CC Component Carrier #5 If cross carrier-scheduing active, UE needs to be informed about PDSCH start on component carrier RRC signaing. PDCCH PDSCH start signaed by RRC Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 13

14 Outine: Carrier aggregation (one) Key Enaber for LTE-Advanced Part I Technoogica background. Part II Test&Measurement aspects, demonstrations. Part III Summary. Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 14

15 Outine: Carrier aggregation (one) Key Enaber for LTE-Advanced Part I Technoogica background. Part II Test&Measurement aspects, demonstrations. Part III Summary. Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 15

16 Summary, concusion & outook Carrier aggregation: to overcome spectrum crunch and to support higher data rates (IMT-Advanced requirements). Most demanded feature out of the LTE-Advanced feature set; chipset / handset design impication: Increased receiver compexity driven by # of carrier (and antennas). CA is transparent to higher ayers (PDCP, RLC). Parameterization on RRC, activation by MAC, MAC is mutipexing entity. One PHY ayer per component carrier impact on upink power contro, BSR, PHR, TADV; Impact due to cross-carrier scheduing. Chaenges on RF front-end: wideband PA s, tunabe antennas, fexibe switches. Outook: CA enhancements in 3GPP Re-11 and Re-12. Timing Advanced Groups (TAG) wi be introduced, aowing random access process aso on Secondary Component Carrier. TDD: different UL-DL configuration per carrier if in a different frequency band. Re-12: new carrier might be introduced, not backward compatibe. Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 16

17 Carrier Aggregation (one) Key Enaber for LTE-Advanced Thank you for your attention!

18 Specification work in 3GPP RAN4 Intra-band contiguous and non-contiguous band combination (RAN#55) Intra-band contiguous. Intra-band non-contiguous. Acronym Mode Work item Work item rapporteur Acronym Mode Work item Work item rapporteur LTE_CA-B7 FDD RP China Teecom LTE_CA_B25 FDD Sprint-Nexte LTE_CA_NC_B3 FDD RP SK Teecom LTE_CA_NC_B25 FDD RP Sprint-Nexte LTE_CA_B38 TDD CMCC LTE_CA_B38 TDD RP Huawei (CMCC) LTE_CA_B41 TDD RP Cearwire Carrier Aggregation Key Enaber for LTE-Advanced Nov 2012 Andreas Roesser, Meik Kottkamp 18