上海贝尔EDGE技术交流新功能篇

EDGE技术交流 新功能篇 All Rights Reser ved Alcatel Shanghai Bell 2007, # 2 | Pr esentation Title | Month 2006 1 B8&B9 NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 G M MS t a t eI d l eS t a n d b yR e a d yR a d i oS t a t eI d l e m o d eT r a n s f e r m o d eR e a d yT i m e rR e a d yT i m e rN C 2 N C 0N C 0 N C 2All Rights Reser ved Alcatel Shanghai Bell 2007, # MSNC2 PACKET MEASUREMENT REPORT (1) PACKET MEASUREMENT REPORT (3) PACKET MEASUREMENT REPORT (2) PACKET CELL CHANGE ORDER NC_Reporting _Period_T MS PTM MS PIM NC0 Activated PACKET MEASUREMENT ORDER NC2 Activated CELL RESELECTION NC_Reporting _Period_T Cell reselection condition fulfilled ! BSS Networl control order All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 NC2相关参数 NC2重选参数类似于通话切换设定 通过调整相应控制小区重选条件的参数的门限值， NC2可减少不必要的小区重选次数 All Rights Reser ved Alcatel Shanghai Bell 2007, # NC2 无线接入 A B C D NC2模式 只有 1个小区重选 给手机用户提供了更好的 GPRS吞吐量 NC0模式 在分组传输模式下，有 3个小区重选 B8目标 : 有效减少小区重选次数（通过 NC2的引入） GPRS传输阶段 All Rights Reser ved Alcatel Shanghai Bell 2007, # 13 | Pr esentation Title | Month 2006 2 Enhanced Transmission Resource Management (B9) All Rights Reser ved Alcatel Shanghai Bell 2007, # Catalog M-EGCH Statistical Multiplexing Dynamic Abis Allocation All Rights Reser ved Alcatel Shanghai Bell 2007, # 15 | Pr esentation Title | Month 2006 2.1 M-EGCH Statistical Multiplexing All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing An M-EGCH link (Multiplexed Enhanced GPRS CHannel) is a bi-directional link established between the MFS and the BTS. An M-EGCH link is a set of 16k GCH channels. An M-EGCH link is defined per TRX. The M-EGCH link of a TRX is necessary: To carry TBF traffic and PACCH signalling when TBFs are established on some PDCHs of the TRX, To carry signalling messages when MPDCHs are defined on the TRX, To carry UL signalling messages after one-UL-block allocation (UL two-phase access), To carry some BTS-MFS signalling. All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing B8: one EGCH per RTS B9: one M-EGCH link for the whole TRX 0 1 7 6 2 3 4 5 EGCH0 1 7 6 2 3 4 5 TRX M-EGCH link 1 to 36 GCHs composed of GCH EGCHEGCHEGCHEGCHEGCHEGCHEGCHGCH GCH GCH GCH 1 to 5 GCHs depending on the TRX class GCH composed of GCH GCH GCH GCH TRX All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing R L C h e a d e rM E G C H h e a d e r ( n e x t s e g m e n t s )M E G C H h e a d e r ( f i r s t s e g m e n t )S Y N C p a t t e r n + Z b i t i n d i c a t o rP a d d i n g b i t sC R C + T a i l b i t s M E G C H h e a d e r ( / N H P and a d d r b y t e )D u m m y F i l l i n g P D UL E G E N D3 2 0 b i t s 3 2 0 b i t s 3 2 0 b i t s3 2 0 b i t s2 0 m s2 0 m s 2 0 m sG C H 1G C H 2G C H 3G C H 4R L C / M A C P D U 1 f o r D B N = x3 2 0 b i t sG C H 5D u m m y F i l l i n g P D UD u m m y F i l l i n gD u m m y F i l l i n gD u m m y F i l l i n gR L C / M A C P D U 2 f o r D B N = xD B N = x + 1D B N = x D B N = x + 2M E G C H l a y e r s e g m e n t a t i o n s u b - l a y e rR L C / M A C l a y e rM E G C H l a y e rf r a m i n g s u b - l a y e rAll Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing Reduction of the Abis and Ater consumption Resources are used in a more efficient way: Instantaneous reaction to radio variations (MCS variations). Example: No more TBF maximum MCS reduction is needed. The resources not used by delayed DL TBFs, extended UL TBFs, are used by other TBFs. 3 2 0 b i t s p e r G C H2 0 m sD B N mD B N m D B N m + 1D B N m + 1 D B N m + 2D B N m + 22 0 m s 2 0 m sRB 1 RB 1 RB 1RB 1 RB 1 RB 1RB 2 RB 2 RB 2RB 2 RB 2 RB 2RB 2 RB 2RB 3 RB 3 RB 3M - E G C H l i n k c o m p o s e d o f 4 G C H sM - E G C H l i n k c o m p o s e d o f 4 G C H sRB 3G C H 1G C H 2G C H 3G C H 4G C H 1G C H 2G C H 3G C H 4All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing 统计复用下， GCH的数量不再是取整的 header EDGE data GPRS data ( M ) C S R a d i o N b G C H t h r o u g h p u t w / ok b / s S t a t M u x DL ULC S - 1 8 1 0 , 7 3 0 , 7 3C S - 2 12 1 1 1C S - 3 1 4 , 4 2 1 , 2 2 1 , 2 5C S - 4 20 2 1 , 6 1 , 6 4M C S - 1 8 , 8 1 0 , 8 6 0 , 8 9M C S - 2 1 1 , 2 1 1 1M C S - 3 1 4 , 8 2 1 , 2 8 1 , 3 3M C S - 4 1 7 , 6 2 1 , 4 7 1 , 5M C S - 5 2 2 , 4 2 1 , 8 1 1 , 8 6M C S - 6 2 9 , 6 3 2 , 3 1 2 , 3 6M C S - 7 4 4 , 8 4 3 , 3 9 3 , 4 9M C S - 8 5 4 , 4 5 4 4 , 1 4M C S - 9 5 9 , 2 5 4 , 3 9 4 , 4 9N b G C H w i t h S t a t M u x0 16 32 48 64 80 throughput (kb/s) CS-1 CS-2 CS-3 CS-4 MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9 All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing In B9: The size of an M-EGCH link (associated to a TRX) can be dynamically decreased or increased. The algorithms to dynamically decrease or increase the size of an M-EGCH link correspond to the Dynamic Abis allocation. All Rights Reser ved Alcatel Shanghai Bell 2007, # M-EGCH Statistical Multiplexing Example: One TBF： 4 PDCH used MCS-7 Not use Statistical Multiplexing 1 PDCH = 4 GCH Total GCH expenditure： 16 GCH Use Statistical Multiplexing 1 PDCH = 3.49 GCH Total GCH expenditure： 14 GCH All Rights Reser ved Alcatel Shanghai Bell 2007, # 23 | Pr esentation Title | Month 2006 2.2 Dynamic Abis Allocation All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation B8: static Abis allocation B9: dynamic Abis allocation 0 1 7 6 2 3 4 5 EGCH0 1 7 6 2 3 4 5 TRX M-EGCH link 1 to 36 GCHs (mixture of GCHs using basic, extra and bonus Abis nibbles) composed of 1 to 5 GCHs depending on the TRX class (and only one GCH can use a basic Abis nibble) GCH Basiccomposed of EGCHEGCHEGCHEGCHEGCHEGCHEGCHGCH ExtraBasic Abis nibbles and Extra Abis nibbles are statically mapped to a RTS. They can only be used in the EGCH of this RTS. GCH ExtraGCH ExtraGCH ExtraGCH BasicGCH ExtraGCH BasicGCH ExtraNo more constraints in B9! GCH BasicTRX All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation X X X X X X E x t r a A b i s n i b b l e s ( n u m b e r o f n i b b l e s p e r R T S = T R X c l a s s - 1) X X B a s i c A b i s n i b b l e s B S M M P P T T T R X c o n f i g u r a t i o n o n t h e a i r i n t e r f a c e L e g e n d : B : B C C H , S : s t a t i c S D C C H , M : M P D C H , P : P D C H , T : T C H , X : A b i s n i b b l e “ w a s t e d ” i n B 8 , : A b i s n i b b l e u s e d i n B 8 In B8, the following Abis nibbles were “wasted”: All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation In B9, the following Abis nibbles are usable for PS traffic: The basic Abis nibbles mapped to a RTS currently available for PS traffic (see “Autonomous Packet Resource Allocation feature to know the list of those RTSs) or mapped to a RTS used as MPDCH. Example: P P P P M C C C R T S s i n a 2 - T R X c e l l L e g e n d : - C : R T S c u r r e n t l y u s e d f o r C S t r a f f i c ( C S c a l l ) , - P : R T S c u r r e n t l y u s e d f o r P S t r a f f i c ( T B F o r M P D C H t r a f f i c ) . R T S a v a i l a b l e f o r P S t r a f f i c R T S r e s e r v e d f o r C S t r a f f i c T h e b a s i c A b i s n i b b l e s o f t h o s e RT S c a n b e u s e d t o e s t a b l i s h s o m e G C H s All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation The “bonus” basic Abis nibbles currently used for BCCH or static SDCCH channels: The list of “bonus” Abis nibbles depends on the cell configuration. All the extra Abis nibbles of the BTS: A number of 64k extra Abis TSs is defined for each BTS by O&M (N_EXTRA_ABIS_TS). The list of extra Abis TSs of a BTS is provided by the BSC to the MFS. All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation The basic Abis nibbles mapped on a RTS allocated to MFS can be used in the M-EGCH link of any TRX of the CELL. The extra Abis nibbles can be used in the M-EGCH link of any TRX of the BTS. The “bonus” Abis nibbles can be used in the M-EGCH link of any TRX of the BTS. All Rights Reser ved Alcatel Shanghai Bell 2007, # Dynamic Abis Allocation Due to Dynamic Abis allocation, new messages have to be sent to the BTS to notify each TRE which Abis nibbles are associated. Those messages are sent via GSL and RSL interfaces. The following scenarios are therefore modified: GCH establishment. GCH release. New scenario appear to distribute GCH resources : Intra-cell GCH pre-emption : between TRXs of a cell Inter-cell GCH pre-emption : between cells of a BTS All Rights Reser ved Alcatel Shanghai Bell 2007, # 30 | Pr esentation Title | Month 2006 3 Extended Uplink TBF Mode（ B9） All Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce The aim of this feature is to extend the duration of the UL TBF in order: To quickly restart data transmission in UL if higher layers in the MS deliver new data, without having to re-establish a new UL TBF, after the countdown procedure has started. To maintain the UL TBF established, some time after the last block (CV=0) has been acknowledged by the network. This feature allows improving access time to the GPRS/EGPRS network. It also improves the throughput in some cases. The feature applies only for R4 MS All Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce MS and BSS capability The MS is aware of the BSS capability by the NW_EXT_UTBF parameter that is broadcast on either BCCH(SI13) . A MS indication indicating support of GERAN Feature Package 1 in the Mobile Station Classmark 3 IE, the MS Radio Access Capability IE and the MS Radio Access Capability 2 IE supports the extended uplink TBF mode. All Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce Functional description 1. Enable or disable the Extended uplink TBF mode through an O&M parameter, EN_EXTENDED_UL_TBF. And configure an inactivity period as duration of extended uplink TBF mode, T_MAX_EXTENDED_UL. 2. Indicate to MS that the network supports the extended uplink TBF mode. The MS is aware of the BSS capability by the NW_EXT_UTBF parameter. So the MS is always aware of the BSS capability before establishing an Uplink TBF. On the contrary the BSS does not always know the MS capability when the first Uplink TBF is established at the beginning of a session. 3. Detect whether or not a given MS supports the Extended Uplink TBF Mode. The MS radio access capability is received at downlink TBF establishment in the first downlink PDU received on Gb interface. 4. In case of cell reselection for an uplink transfer, some time TBF may elapse before a Downlink PDU is received. “Radio Access Capability Update” procedure is used to obtain the information. Apply the Normal release mode if the MS does not support the Extended Uplink TBF Mode or if the BSS does not know MS capability. 5. Switch to Extended Uplink TBF Mode when a MS is detected to support the feature, when the Radio Access Capabilities are received during the UL transfer. Maintain to USF scheduling an uplink TBF during the inactivity period, while the MS has no data to transmit, and maintain the reception of uplink RLC data block as long as the uplink TBF is in extended phase. 6. Release the uplink TBF upon timer T_max_extended_UL expiry All Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce .If MS support Extended UL TBF mode is known. Entering the Extended uplink phase When the MS begins to run out of LLC data, it begins the countdown normally. When the BSS receives the last RLC block (CV =0), and if all the previous blocks have been correctly received, the BSS sends a Packet Uplink Ack/Nack with FAI set to 0, with the SSN incremented like for an active TBF (SSN = last received BSN +1). All RLC numbering variables are kept as TBF was still active. The uplink TBF is now extended and will not be released by the mobile. The BSS starts the timer T_max_extended_UL to monitor the maximum duration of the extended phase. R L C b l o ck , B S N =n , C V = 0MS BSSP U A N , SS N = n + 1 ,F A I = 0 E n t e r T B F e x t e n d e d p h a s e .S t a r t T _ m a x _ e x t e n d e d _ U LAll Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce BSS behavior during the Extended uplink phase The BSS continues to schedule USF, so that the MS is able to resume an uplink transfer when required. While the UL TBF is in extended phase, the reception of an uplink dummy block from the MS, shall not cause the N3101 counter to be incremented in the BSS. Only invalid block reception increments N3101. While the UL TBF is in extended phase, the reception of an uplink dummy block from the MS shall not cause the N_UL_dummy counter to be incremented. All Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce MS BSST _ m a x _ e x t e n d e d_ U L e x p i r yU S FD u m m yb l o c kP U A N , FA I = 1 , S /P = 1P C AT B F i s r e l e a s eN o m i n a l c a s e T_max_extended_UL expiry The network ends the TBF permanently by sending a Packet Uplink Ack/Nack with FAI = 1 and polling. When receiving PUAN with FAI=1 and polling, the MS sends the Packet Control Ack in response to polling, and then aborts the uplink TBF. When the timer T_max_extended_UL expires, the BSS shall wait for all the radio blocks corresponding to already transmitted USF, before transmitting FAI =1. If the radio blocks corresponding to the last scheduled USF carry RLC data block, not the Dummy block, then the BSS shall restart the uplink TBF. MS BSST _ m a x _ e x t e n d e d_ U L e x p i r yU S FR a d i o bl o c k , B SN = n + 1U S FR a d i o bl o c k , B SN = n + 2 , e t c T B F i s a c t i v e a g a i nT r a n s f e r r e s u m p t i o n a f t e r t i m e r e x p i r yAll Rights Reser ved Alcatel Shanghai Bell 2007, # B9 Extended UL TBF Introduce Principle to design USF scheduling USF for extended mode are scheduled only on the PDCH, which carries PACCH. IF the PDCH supports uplink TBF, which all are in extended mode, Then, if flag EN_FAST_USF_UL_EXTENDED = enable then the throughput in radio blocks is equally shared between MS (round robin of one RLC block per MS). So USF are scheduled as follows: One MS in extended mode on PACCH: USF scheduled every 20ms Two MS in extended mode on PACCH: USF scheduled every 40ms n MS in extended mode on PACCH: USF scheduled every n x 20m ELSE (if the flag EN_FAST_USF_UL_EXTENDED is disabled or if the PDCH supports at least one MS which is in UL transfer) A polling period T_extended_UL_TBF_POL, is used for all MS in extended phase. A default value is 200ms. The remaining bandwidth is used for MS in transfer. All Rights Reser ved Alcatel Shanghai Bell 2007, # OMC-R Parameters HMI name Definition Sub-system Instance OMC-R access Type Def value Range Unit EN_EXTENDED_UL_TBF Flag to disable/enable the extended TBF mode feature on the uplink MFS cell Changeable Flag 0 0,1 None T_MAX_EXTENDED_UL Maximum duration of the extended uplink TBF phase MFS cell Changeable Timer 2000 100,4000 ms EN_FAST_USF_UL_EXTENDED Flag to disable/enable the transmission of USF every 20ms in extended mode MFS BSS Changeable Flag 1 0,1 None T_EXTENDED_UL_TBF_POL To control the USF scheduling on the uplink when a TBF is in extended TBF mode MFS MFS None (DLS) Timer 200 120,500 ms All Rights Reser ved Alcatel Shanghai Bell 2007, # Example for WAP Access The WAP access time is estimated with and without Extended UL TBF, for an MS which is already GPRS attached. The time is estimated as follows: for an uplink message: MS response time + UL transmission time on the radio interface + UL TBF establishment for a downlink message: Network response time + DL transmission time on the radio interface + DL TBF establishment MS type is GPRS with 3 PDCH downlink and 1 PDCH uplink Invoke Ack is not counted for access time, because the user can see the page as soon as the invoke reply is received All Rights Reser ved Alcatel Shanghai Bell 2007, # Example for WAP Access All Rights Reser ved Alcatel Shanghai Bell 2007, # Example for WAP Access All Rights Reser ved Alcatel Shanghai Bell 2007, # 42 | Pr esentation Title | Month 2006 4 Enhanced Packet Cell Reselection(B9) All Rights Reser ved Alcatel Shanghai Bell 2007, # Introduction 减小 packet cell reselection 过程服务损耗 (支持NC0和 NC2) Network Assisted Cell Change Procedures (NACC) : 手机能在服务小区中获得目标小区的 (P)SI消息 Only for R4 MS. Packet (P)SI Status procedure : 允许手机在没有读取完整新小区的 (P)SI 消息前，就能接入新小区， Mainly for R4 MS. All Rights Reser ved Alcatel Shanghai Bell 2007, # Network Assisted Cell Change NACC NC2 NACC NC0 Packet (P)SI Status Packet PSI Status Packet SI Status Content All Rights Reser ved Alcatel Shanghai Bell 2007, # Network Assisted Cell Change (NACC) 服务小区 的