3gpp tsg ran wg1 #61bis 會議...

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出國報告(出國類別:其他) 3GPP TSG RAN WG1 #61bis 會議 出國報告 出國人員:鄭延修、任宇智、李奇芳、 邱哲盛、廖晨吟 派赴國家:德國德勒斯登 出國期間:99 06 26 日至 99 07 04 報告日期:99 07 07

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出國報告(出國類別:其他)

3GPP TSG RAN WG1 #61bis會議

出國報告

出國人員:鄭延修、任宇智、李奇芳、

邱哲盛、廖晨吟

派赴國家:德國德勒斯登

出國期間:99年 06月 26日至

99年 07月 04日

報告日期:99年 07月 07日

2

摘 要

本次 3GPP RAN1 Meeting #61bis 標準會議於六月在德國德勒斯登舉行,由 Deutsche

Telekom主辦,會議時間由 2010年 6月 28日至 7月 2日共 5天。本研發團隊依規劃有 5

位成員出席參加 RAN1#61bis 會議,主要任務包括 LTE/LTE-A 技術議題追蹤討論、發表

技術貢獻、參與技術協商及立場表達、開發具研究潛力議題。

3GPP LTE-Advanced:

3GPP為配合 ITU-R IMT-Advanced標準評選時程,相對應地準備以 LTE-Advanced作為將

來提案至 ITU-R 的候選系統。經過先前幾次 RAN1 會議的討論,目前 LTE-Advanced 的

Rel-10系統規格要求已大致完成。3GPP RAN工作群組將針對 LTE-Advanced系統規格要

求,逐步展開相關技術討論與標準制定。本研發團隊為掌握目前 LTE-Advanced的各項進

度,為未來規畫參與 3GPP LTE-Advanced之標準制定預作準備,此次派出多位成員出席,

期能充份掌握會議期間,各個並行會議之最新發展狀況。

現階段 Rel-10 LTE-A最重要工作為 Carrier Aggregation (CA)、Enhanced Downlink Multiple

Antenna Transmission、UL Multiple Antenna Transmission等三項技術主題,此三大主題在

本次會議也有不少進展。此外,Energy Saving for UMTS研究項目(Study Item, SI)相關工

作中斷至今年 9月,而 Coordinated Multi-Point (CoMP) Operation for LTE研究項目相關工

作亦於今年 9月再展開。由於 CoMP會議 Rel-11 LTE-A重要功能特色,應思考相關技術

佈局方向及累積技術提案能量。

Rel-10 LTE-A 新興技術議題「 Enhanced ICIC for non-CA based deployments of

heterogeneous networks for LTE」相關候選技術將於下一次會議(RAN1#62)收斂,由於此次

會議 control channel ICIC已進行充分討論,下一次會議可以思考佈局 data channel ICIC及

cell association技術,並在這些項目提出具發展潛力的技術貢獻。

3GPP LTE:

現階段 LTE Rel-8/Rel-9標準已進入 Stage 3,PHY Layer部分已在細節、小部分修訂,此

部分工作以掌握現況為主;MAC、RLC、PDCP、RRC release 8和 release 9的部份,功能

大致上都已經完成,現在在做細部的修定,因此,參與同仁將配合目前實作系統之技術

3

發展,適時提出技術提案。

4

目 錄

摘 要........................................................................................................................2

一、會議名稱..........................................................................................................5

二、參加會議目的及效益......................................................................................5

三、會議時間..........................................................................................................5

四、會議地點..........................................................................................................5

五、會議過程(會議議程及會議紀要)...................................................................5

5

一、會議名稱

3GPP TSG RAN1 #61bis Meeting

二、參加會議目的及效益

參與 LTE-A、bandwidth extension、OCC Mapping等討論及尋找可研究的題目

參與 Carrier aggregation、MIMO以及 eICIC等議題在 LTE-Advanced系統的相

關討論

報告本研究團隊所發表的文章

與其他大廠接觸,討論 LTE-Advanced標準技術發展方向

三、會議時間

28 June- 2 July 2010

四、會議地點

MARITIM Hotel Dresden (RAN1 #61bis) , Dresden, Germany

五、會議過程(會議議程及會議紀要)

(一)會議議程

RAN1的會議議程如下 (28 June-2 July 2010):

6

7

(二)會議紀要

重點摘錄

本次會議由 Deutsche Telekom主辦,共約有 330人參加,與會公司/機構共

約有 70~80家,其中電信營運商有 15家。

台灣與會公司/機構有中華電信研究所、工研院、宏達電、資策會、聯發科、

華碩科技與恆通高科等 7家。

本次會議 UTRA (WCDMA/HSPA)相關技術議題共有 4個議程,分別為:

Agenda Item 5.2: 4-carrier HSDPA

Agenda Item 5.3: LCR TDD MC-HSUPA

Agenda Item 5.4: MU-MIMO FOR 1.28MCPS TDD

Agenda Item 5.5: Study on Improvements for Distributed Antennas for

1.28Mcps TDD

本次會議 E-UTRA (LTE/LTE-A)相關技術議題共有 7個議程,分別為:

Agenda Item 6.2: Carrier Aggregation

Agenda Item 6.3: Enhanced Downlink Multiple Antenna Transmission

Agenda Item 6.4: UL Multiple Antenna Transmission

Agenda Item 6.5: UL RS Issues Relevant to LTE-A Work Items

Agenda Item 6.6: Relaying

Agenda Item 6.7: Network-Based Positioning Support for LTE

Agenda Item 6.8: Enhanced ICIC for Non-CA Based Deployments of

Heterogeneous Network for LTE

會議主席Matthew Baker在會議一開始即表示Rel-10 LTE-A標準制訂以滿足

ITU-R IMT-A/4G提案時程需求為主要目標,因此現階段 Rel-10 LTE-A最重

要工作為 Carrier Aggregation (CA)、Enhanced Downlink Multiple Antenna

8

Transmission、UL Multiple Antenna Transmission等三項技術主題。也因如

此,Energy Saving for UMTS研究項目(Study Item, SI)相關工作中斷至今年 9

月,而 Coordinated Multi-Point (CoMP) Operation for LTE研究項目相關工作

亦於今年 9月再展開。

會議期間,屬於 Technical University of Dresden (TU-Dresden)的 Vodafone

Chair 所參與執行的 Easy-C 計畫,利用 Vodafone 與 T-Mobile 的站台進行

CoMP技術 Demo,分析測試結果重要發現如下:

Uplink CoMP

(a) Practical measurements confirm that uplink joint detection offers large

throughput gains, in particular at the cell-edge

(b) Decentralized schemes have shown to be low-backhaul alternatives in

asymmetric interference scenarios, but these provide less gain

(c) Comparing theory to practice, the gain from successive interference

cancellation (SIC) appears rather weak in practice. This is probably

due to sub-optimally implemented receiver strategies pointing this

particular implementation, but requires further studies.

Downlink CoMP

(a) DL CoMP is possible in practice.

(b) DL CoMP requires CSI feedback overhead (in FDD systems), where

the performance / overhead trade-off still needs further research and

practical assessment.

(c) DL CoMP requires a very low CSI feedback delay, and is very

sensitive to moving terminals or the environment around terminals. It

hence appears beneficial only for fairly static users.

(d) DL CoMP requires a synchronization of base stations in time and

frequency, since the effects are very similar to those of the uplink.

9

關於 Carrier Aggregation技術主題,本次會議已有初步決議之議題如下:

PHICH resources sharing

關於 PDCCH中之 search space設計

關於 PDCCH中之 ambiguity issues and Configuration / reconfiguration of

CIF

關於 PUCCH中之(DL) A/N multiplexing回報機制

應用於 CA之週期性 CQI回報機制

關於 PUSCH之 UCI載送方法

關於 Enhanced Downlink Multiple Antenna Transmission技術主題,本次會議

已有初步決議之議題如下:

應用於 extended CP之 DM RS Pattern

關於 intra-cell之 CSI RS設計

應用於 DL MU-MIMO技術之 DM RS ports / scrambling sequences

關於 UL Multiple Antenna Transmission技術主題,本次會議已有初步決議之

議題如下:

在 UL SU-MIMO技術下關於 PUSCH之 UCI multiplexing方法

應用於 UL SU-MIMO之 PHICH mapping

投入研究 LTE/LTE-A重要標準技術發展

相關標準技術重要的進展整理如下:

「Feedback design and codebooks」相關發展摘要如下:

本次會議 AT&T提出一篇技術貢獻 R1-104184,以電信營運商觀點探討

適用於 MU-MIMO之 4-tx天線架構,並提出 Closely Spaced Cross-pol

及Widely Spaced Cross-pol兩種天線架構下 SU-MIMO及MU-MIMO模

擬結果 (如圖二所示 )。結果顯示在 Widely Spaced Cross-pol 架構

10

MU-MIMO亦能有約 5.43%的容量增益,AT&T建議在未來設計 LTE-A

MU-MIMO技術時能加入 Widely Spaced Cross-pol 之 4-tx天線架構模

擬。經過討論,AT&T的建議獲得大會採納,結論如下所示:

“4-tx widely-spaced cross-polarized antenna configuration is added to the

set of configurations to be taken into account for the MU-MIMO feedback

enhancement evaluation.”

圖二、Spectral Efficiency for SU-MIMO and MU-MIMO

針對「General development of feedback framework」討論項目,會議主

席將所有相關的技術貢獻(共 11 篇)逐一討論,相關結論如下所示,其

中最值得注意的是雖然 LTE-A支援 8-tx多天線架構,但技術發展重點

仍落於 4-tx多天線架構。

(a) It is noted that the cosigning companies of R1-104169 have agreed that

there are significant gains for enhanced feedback schemes that are

based on the cited WFs.

(b) It is noted that the cited WFs are already agreed including the case of 4

tx and the focus will be on making the way forward more concrete for

4 tx.

11

(c) It is noted that 4 tx is the priority.

針對「Uplink control signalling」討論項目,會議主席將所有相關的技

術貢獻 (共 14 篇 )逐一討論,最後有兩件較具關鍵性的 WF

(way-forward) – R1-104234及 R1-104244,但由於兩方陣營勢力相當且

各有堅持,因此目前尚無相關結論。其實觀察 2篇WF可以發現,癥結

點在於“subband PMI”回報是否要在 PUCCH 上支援,這也牽扯到目前

LTE-A是否要跳脫 R8 LTE的設計。

針對「Uplink control signalling」討論項目,本團隊在本會期亦提出技

術貢獻 R1-104062,我們表明以下看法:

(a) PMI2 is reported with wideband CQI and the subband PMI2 is set to

the system bandwidth

(b) CQI/PMI2, PMI1/RI can be sent on PUCCH in different sub-frames,

where PMI1/RI can be sent in different or the same subframes.

(c) Some new parameter can be added to specify the location of PMI1

(d) PMI1 should be robustly encoded to prevent from the long period of

error propagation

(e) A new reporting mode for PUCCH is required which can be extended

from mode 1-1/2-1 in Rel-8

「Enhanced ICIC for non-CA based deployments of heterogeneous networks for

LTE」相關發展摘要如下:

本會期總共有近 90篇關於此議題的技術貢獻,數量增加快速。由於是

新的WI,對於與會廠商而言,是一個可以發揮的新領域。

此議題需在下次 RAN1#62會議(Aug., 2010)後完成研究評估,並定義出

解決方案及標準制訂方向,以目前進度推測,此議題必是下次會議重

點,尤其是 data channel及 cell association解決方案。

本會期此議題之技術討論著重於 control channel解決方案,由於時間有

12

限,這次會期僅討論到 14篇技術貢獻。

針對此議題本會期主要有兩項進展:

(a) 同意在 macro-pico佈建環境且無 range extension機制時,以 reuse

Rel-8/9 ICIC及 power control為工作方向

(b) 在 macro-femto 佈建環境下之 control channel 干擾避免機制將以

power control 及 time shifting 為基本方法,但是未排除 frequency

domain方法。

針對本議題之 cell association 技術,本團隊在本會期亦提出技術貢獻

R1-104063,根據我們的模擬結果,我們提出以下看法:

(a) Biased RSRP can effectively increase the pico UEs to offload the bad

geometry users from marco cell.

(b) Both 5% tile and median cell spectral efficiency could be improved

with the appropriate bias value (e.g. 5 dB).

(c) In order to effectively improve the whole performance, frequency

allocation methods might be adopted with biased RSRP selection

scheme.

「UE Categories for Rel.10」相關發展摘要如下:

本會期僅有 5篇技術貢獻討論 Release 10的 LTE-A UE Categories,目前

並於相關結論,但由於 UE Categories的定義關連到WG4的工作項目,

因此應該近期會有相關結論。

考量 UE Categories的定義將影響日後 Rel-10 LTE-A終端功能及設計,

甚至是整體系統效能,因此需要格外注意。

由 Vodafone 及 Orange 兩家重量級電信營運商所提出的技術貢獻

R1-104193,表明未來 Rel-10 LTE-A於終端之營運需求。他們希望另增

加一個新 UE category (即)以支援 UL SU-MIMO,如下表所示。

13

與會實錄

Downlink Reference Signal

Downlink Reference Signal 在星期三討論,依序討論以下各議題:Intra-cell CSI-RS,

Muting,DMRS EX-CP,DM RS OCC mapping。星期五下午的時候,並針對 Intra-cell

CSI-RS與 DM RS OCC mapping有結論。

Intra-cell CSI-RS

在星期三的討論中,可以有下列這些觀察結果。對傳統 UE的效能的效能影響,CDM-T

並跟天線埠 5的 1RE有重疊與 CDM-F且不予天線埠 5沒有重疊效能類似,當 CSI-RS

插入的時候。

因此關於對天線埠 5的討討論有兩個題選項。

選項一:至多有一個 CSI-RS樣態不與天線埠 5重疊,支持的公司有 Huawei, CATT,

Intel , Motorola, Qualcomm, Alcatel Lucent, Alcatel Lucent Shanghai Bell, HTC, CMCC,

Potevio, ZTE。

選項二:至少有一個 CSI-RS樣態跟天線埠 5的樣態有至多 1RE的重疊,支持的公司

Pantech, Nokia, Nokia Siemens Networks, NTT DOCOMO, LG, ZTE, Ericsson,

ST-Ericsson, NEC, Mitsubishi, TI, Sharp, MediaTek, Fujitsu, Samsung, Panasonic,

LG-Nortel, ETRI, ITRI。

星期三針對 DM RS的貢獻有下列的結論:

o 基本樣態:

14

CSI-RS的基本樣態只有一種時間、頻域跟碼的結構

o 針對 N個 CSI RS ports只有單一的樣態:

此單一樣態由 N Res所組成,並允許頻域跟時域的平移

此單一樣態再多個細胞內允許被時域或頻域的平移

o 多樣態:

至少兩個單一樣態

星期五的討論由 CMCC主導提出 contribution R1-104263,並由 LG Electronics, NTT

DoCoMo, CMCC, Qualcomm Inc., Ericsson, ST-Ericsson, Texas Instruments, Nokia,

Nokia Siemens Networks, Motorola, Alcatel-Lucent, Alcatel-Lucent Shanghai Bell, CATR,

CATT, CHTTL, Huawei, HTC, HT mMobile, MediaTek, Potevio, III, ITRI, ZTE, Sharp,

NEC, Mitsubishi, Hitachi等公司支持。對 CSI-RS做成最後結論。

CSI-RS Pattern for Normal CP for {2,4,8} APs

‧ Following CDM-T, OCC length=2 CSI-RS patterns are supported for 8 APs

– The 5 CSI-RS patterns in 圖表 3 for Normal CP supported for FS1 and

FS2

– The 3 CSI-RS patterns in 圖表 1 supported for FS2

‧ Nested corresponding patterns for 4, 2 APs

CSI-RS Pattern for Extended CP for {2,4,8} APs

‧ Following CDM-T, OCC length=2 CSI-RS patterns are proposed for 8 APs

‧ The 4 CSI-RS patterns in 圖表 4 for Extended CP supported for FS1 and

FS2

‧ The 3 additional CSI-RS patterns in 圖表 2: supported for FS2

‧ Nested corresponding patterns for 4, 2 APs

15

圖表 1: CSI-RS for Normal CP

圖表 2: CSI-RS for Extended CP

16

圖表 3: CSI-RS for Normal CP.

0 1 2 3 4 5 6 7 8 9 10 110 1

0 10 1 0 12 3

2 32 3 2 30 1

0 10 1 0 12 3

2 32 3 2 3

0 1 2 3 4 5 6 7 8 9 10 110 1

0 10 1 0 10 1

0 10 1 0 10 1

0 10 1 0 10 1

0 10 1 0 1

Extended CP w/o port5,

0 1 2 3 4 5 6 7 8 9 10 11

0 10 1

0 1 0 12 3

2 32 3 2 34 5

4 54 5 4 56 7

6 76 7 6 7

圖表 4: CSI-RS for Extended CP

針對 CSI-RS的細胞間干擾消除技術Muting,進而衍伸出雜訊估測的議題。針對這個

議題,所得到的結論如下:

- Current RAN1 simulation assumption for interference estimation is to use CRS

- Further study is needed to verify the need of introducing new standard support for

interference estimation.

針對Muting所造成對傳統系統 PDSCH的影響如下:

- When PDSCH muting is applied in other subframes than the ones transmitting

CSI-RS of the serving cell, performance degradation of Rel-8/9 UE becomes more

significant.

17

- Thus, in terms of legacy impact, it is preferable that PDSCH muting (if supported)

is limited to the same subframe as the ones transmitting CSI-RS on the condition

that sufficient reuse factor providing the muting gain can be obtained.

針對第一階段的評估的結果有如下的發現

- MSE performance improvement is achieved by CSI-RS with PDSCH muting

compared with CSI-RS without muting and CRS in channel estimation of

neighboring cells.

- Throughput performance should be evaluated to further clarify the benefit of

muting

針對現有的結果有如下的發現

- Throughput performance of CoMP UE is improved by CSI RS with PDSCH muting

compared with CSI-RS without muting and CRS.

- PDSCH muting is beneficial for CoMP schemes that require inter-cell channel

measurements in future release.

- It is noted that introduction of PDSCH muting in future release (>Rel-10) would cause

negative impact to Rel-10 UE

針對 Rel-10可能會造成的標準影響如下

- Rate matching around muted RE

- Following signaling support (implicit or explicit) to UE:

Enabling/disabling of muting

Muted RE location (offsets and duty cycle), where more study will be needed on

- Signaling formats

18

- Reduction of muting patterns

- Power usage of muted RE

在下個會期的WF如下

- Each company is suggested to study further if PDSCH muting can be supported in

Rel-10. If yes, how to support muting should be proposed considering the specification

impacts.

本會期已經將 DMRS再 EX-CP下的的設計做個決定。Rank 1-2的設計如圖表 5,在

normal subframe使用延遲的架構,再 DwPTS將一部分給去除。Rank 3-8在 R-10不

被支援,但在後續的標準,可以被引入。

圖表 5:EX-CP DMRS樣態

針對 OCC Mapping 目前有兩個提案在競爭,一個是 R1-104254 的設計,如

19

圖表 6 所示,由 CATT, Ericsson, ST-Ericsson, I2R, Mitsubishi, NEC, Nokia, Nokia

Siemens Networks, NTT DOCOMO, Panasonic, Potevio, Qualcomm, Sharp, Sony,

Vodafone, Deutsche Telekom等公司所支持,另外一個是 R1-104255的設計如圖表 7

所示,由 AT&T, Broadcom, CHTTL, ETRI, HTC, HT mMobile, III, LG Electronics,

MediaTek, Pantech, Research In Motion, Samsung所支持。且將於 RAN#62會期下決定。

20

圖表 6:OCC Mapping

d

c

b

a

b

a

d

c

d

c

b

a

b

a

d

c

d

c

b

a

b

a

d

c

d

c

b

a

b

a

d

c

d

c

b

a

b

a

d

c

d

c

b

a

b

a

d

c

1 x 1 x 1 x 1 x 1 x 1 x

1 x -1 x 1 x -1 x 1 x -1 x

1 x -1 x? x ?2 x ?-2 x ?-1 x

2

313 ie

j

AP7/9

AP8/10

AP11/12

AP13/14

[a b c d]AP7/9 [1 1 1 1]

AP8/10 [ 1 -1 1 -1]AP11/12 [a1 b1 c1 d1]AP13/14 [a2 b2 c2 d2]

subcarriers

OF

DM

sym

bol

s

even numbered RB odd numbered RB

CDM group 1

CDM group 21 x ?2 x 1 x ?2 x?-2 x ?-2 x

圖表 7:OCC Mapping

21

Carrier Aggregation

PCFICH Design

此次討論主要著重於根據前幾次會議討論的結果,在 cross-carrier schedule時,

cross-carrier scheduled component carrier 上面使用的 CFI值,應該如何取得或是

PDSCH的起始位置如何決定(過去在 self-carrier scheduled component carrier通常藉

由 PCFICH得到的)。

上次會議決議,當 cross-carrier scheduling時,UE應該透由「新標準化的方法」

來得到被 cross-carrier scheduled的 component carrier上 PDSCH的開始符號位置。另

外也決議使用RRC signaling for CFI作為基本原則。但是,是否使用多個RRC signaling

values來指示不同 set of subframes (e.g. normal subframe or MBSFN subframes)各自的

CFI值需要進一步討論。至於是否需要其它的方法(e.g. dynamic signaling)還需要進一

步的討論與研究。

本次會議討論的結果,還是無法達成共識是否需要新的方法。另外對於是否使

用多個 RRC signaling values來指示不同 set of subframes (e.g. normal subframe or

MBSFN subframes)各自的 CFI值仍然無法決定。基本決議如下:

Send LS to RAN2:

- RAN1 has determined that for UEs that may be cross-carrier scheduled using CIF,

a single value of the PDSCH starting position on the CC carrying the PDSCH

should be indicated to the UE by RRC.

- RAN1 was not able to agree on whether signalling of a second PDSCH starting

position for a certain set of subframes could also be useful.

Need for PHICH collision handling

本次會議再次 confirm只需要單一 set of PHICH resource給 Rel-8 to Rel-10的 UE使

用。且無法在是否需要新的方法來解決 PHICH collision的問題上達成共識。

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Blind Decoding and Search Spaces

繼上次會議之後,本次會議只有針對 search spaces設計的細節來做簡短的討論,基本

決議如下:

Same hashing function (offset between search spaces for different CCs is not a

function of the subframe number)

o CC-specific offset

Offset is a function of (at least) CIF

到下次會議結束前繼續討論

No additional RRC signalled parameters

可能的額外 refinements需要進一步研究

Configuration/reconfiguration of CIF

RAN1於本次會議中達成共識,認為普遍考慮的現存 implementation-based的方法就

足夠解決 ambiguities related to CIF (re-)configuration可能的問題,不需要提供任何額

外的新方法。最後決議如下:

If a PDCCH candidate of CSS-DCI format without CIF and a PDCCH candidate of

USS-DCI format with CIF 都有相同的 payload size, scrambling by C-RNTI and the

same starting CCE, the UE 將假設 only the PDCCH candidate of CSS-DCI format

may be transmitted, 以及 the PDCCH candidate of USS-DCI format will not be

transmitted。

ACK/NACK multiplexing on PUCCH

這個議題已經討論過很多次會期,但是從來沒有辦法達成基本的共識。在會議前的

email討論中,大家對模擬的假設與參數有基本的共識。在會議中,各種可能的方法

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也再次被慎重的討論。基本的觀察如下:

- 各公司間的 simulation results有基本上好的 alignment。

- For large payload sizes, DFT-S-OFDM 基本上看起來有最好的 performance

o 如何在 DFT-S-OFDM and Format 2 之間做出選擇基本上是依據

performance與 possible specification effort間的考量。

- For small payload sizes, channel selection基本上看起來有最好的 performance

(儘管 performance的差距是相對的小)

o Choice is between maintaining a single format (same as with large payload

sizes) and performance / similarity with Rel-8 for simple implementation。

- Discuss further offline to reach way forward - revisit on Thursday.

o Keep overhead in mind。

最後會議中終於有初步的共識如下:

- For Rel-10 UEs that support up to 4 A/N bits: PUCCH Format 1b with channel

selection

- For Rel-10 UEs that support more than 4 A/N bits: DFT-S-OFDM

大部分的議題還是得繼續討論到下次會期看看會不會有進展。

UCI on PUSCH

本次會議關於 carrier aggregation的所有議題中,本議題有最大的進展。會議基本決

議如下:

PUCCH + PUSCH on same and different CCs supported as part of CA WI

o Single UE capability assumed (inter and intra CC) and single configuration

from network side unless concerns are raised by RAN4

Control piggy-backing on PUSCH (UCI on PUSCH) supported for CA and non-CA

operation

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The choice of PUSCH in the following cases are FFS:

o aperiodic CSI

o SPS

o non-adaptive retransmissions

o small PUSCH payloads

In all other cases, if the UE has a PUSCH transmission on PCC, then any UCI on

PUSCH is carried on PCC.

In case of transmissions on one or multiple PUSCHs and no PUSCH transmission on

PCC:

o Then any UCI on PUSCH is carried on one PUSCH on SCC

If simultaneous PUCCH + PUSCH is not configured and there is at least one PUSCH

transmission, all UCI shall be piggybacked on a PUSCH

If simultaneous PUCCH+PUSCH is configured and there is at least one PUSCH

transmission

o UCI can be transmitted on either PUCCH or PUSCH with a dependency on

the situation that needs to be further discussed

o All UCI mapped onto PUSCH in a given subframe gets mapped onto a

single CC irrespective of the number of PUSCH CCs

Whether part of UCI gets mapped onto PUCCH and part of UCI gets

mapped on to PUSCH in same or different CCs needs to be

discussed

請注意上述決議並不暗示 anything about which DL CC(s) an aperiodic CSI report relates

to。另外請注意 the number of possible triggers for aperiodic CSI and the DL CC(s) 的相

關問題需要進一步研究。另外對於傳送在 PUSCH上的 UCI的 coding議題決議如下:

- For up to 2 bits A/N (at least for single DL CC), reuse Rel-8 coding scheme

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- For 3-11 (if needed) bits RI and A/N, reuse Rel-8 RM PUSCH UCI block code

o If it is decided to be necessary to transmit more than 11 bits RI, code and

number of bits at which the code switches is FFS

o Note: exact max number of RI bits to be supported is FFS.

DL MIMO

DM-RS pattern

經過前幾次會期的討論,截至本會議前,僅剩下 DM-RS pattern for extended CP需要

討論。基本原則決議如下:

• 以下 DM-RS patterns 將被採用來 for rank 1-2

‒ Staggered structure is used in normal subframe

‒ Punctured version is used in DwPTS

• Rank 3-8 transmission not supported in Rel-10 for both normal subframe and

DwPTS

‒ It is not precluded in later release

Feedback design and Codebooks

關於 feedback以及 codebook的議題已經討論過相當多會期,仍未能達成顯著的進展。

有鑑於年底的期限,公司間先對 simulation assumption達成了協議,並且 4-tx

widely-spaced cross-polarized antenna configuration is added to the set of configurations

to be taken into account for the MU-MIMO feedback enhancement evaluation。剩下的議

題,例如 codebook generation and design,feedback的細部方法與內容,將在下次會議

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結束前繼續討論(關於 4天線的做法是目前優先需要完成的重點)。

UL MIMO

PHICH mapping for SU-MIMO

這是一個相對簡單的議題,很快就有基本假設上的共識如下:

CSI: the IE in the UL grant

CS: cyclic shift used for UL DMRS, defined for each layer

CS for all layers will be implicitly determined from the same CSI value

根據各公司間的提案,最後要在兩個主要的 alternatives間做出選擇:

o Alt1: The CSI value associated with the PUSCH transmission

o The first PHICH is determined by CSI (as in Rel-8), the second is

determined by replacing CSI with (CSI+ 1) in the same Rel-8 equation

o Alt2: The first PHICH is determined by Rel-8 equation, the second is determined

by replacing (lowest PRB index) with (lowest PRB index+1) in the same Rel-8

equation

最後會議決議採用 Alt2當作基本原則。

eICIC

Macro-Pico deployment

針對這個議題,在會前的 email discussion中已經有 excessive的討論。也由於 Pico cell

相對是基於基地台的掌控之下,很快做出基本決議如下:

Macro-Pico deployment- without any range expansion schemes

– DL

o No Problem for control channel

o Reuse R8/9 ICIC for data channel

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– UL

o Reuse R8/9 ICIC for data channel

o Reuse R8/9 power control mechanism for both control and data

channel

其它的 enhancements需要進一步研究。

Macro-Femto deployment

會議中,基於各公司提出的 control channel solution與 time domain approach做出討

論,最後做出基本決議如下:

Consider power control and time domain solution as baseline solutions

Frequency domain solution is not precluded.

More concrete proposal of each solution should be provided (To be revisited on Friday,

shown below)

Ensure backwards compatibility to Rel8/9 UE

Strive for at least one common TDD and FDD solution whenever possible

Feedback from other WGs should be consolidated to make decision

Applicability of macro-pico scenario is FFS

對於 time domain approach雖然相對 frequency domain approach是一個相對不好的方

法,但是基於目前的狀況以及對 specification effort的考量,將繼續在下次會議前討

論出細部的方法。