上海贝尔EDGE技术交流新功能篇

1、edge技术交流 新功能篇 all rights reserved alcatel shanghai bell 2007, # 2 | presentation title | month 2006 1 b8&b9 nc2 all rights reserved alcatel shanghai bell 2007, # nc2 all rights reserved alcatel shanghai bell 2007, # nc2 all rights reserved alcatel shanghai bell 2007, # nc2 all rights reserved alcate

2、l shanghai bell 2007, # nc2 g m mg m m statestate i dl e st andby ready radioradio statestate i dl e m ode transf er m ode ready ti m er ready ti m er n c2n c2 n c0n c0n c0n c0 n c2n c2 all rights reserved alcatel shanghai bell 2007, # ms nc2 packet measurement report (1) packet measurement report (

3、3) packet measurement report (2) packet cell change order nc_reporting _period_t ms ptm ms pimnc0 activated packet measurement order nc2 activated cell reselection nc_reporting _period_t cell reselection condition fulfilled ! bss networl control order all rights reserved alcatel shanghai bell 2007,

4、# nc2 all rights reserved alcatel shanghai bell 2007, # nc2 all rights reserved alcatel shanghai bell 2007, # nc2 all rights reserved alcatel shanghai bell 2007, # nc2 pnc2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 reserved alcatel shanghai bell 2007, # nc2 无线接入无线接入 a b

5、 c d p 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 p 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传输阶段传输阶段 all rights reserved alcatel shanghai bell 2007, # 13 | presentation title | month 2006 2 enhanced transmission resource management (b9) all rights reserved alcatel shanghai bell 2007, # catalog

6、q m-egch statistical multiplexing q dynamic abis allocation all rights reserved alcatel shanghai bell 2007, # 15 | presentation title | month 2006 2.1 m-egch statistical multiplexing all rights reserved alcatel shanghai bell 2007, # m-egch statistical multiplexing an m-egch link (multiplexed enhance

7、d 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 ca

8、rry 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 reserved alcatel shanghai bell 2007, # m-egch statistical multiplexing b8: one egch per rts b9: one m-egch lin

9、k for the whole trx 01762345 egch 01762345 trx m-egch link 1 to 36 gchs composed of gch egch egch egch egch egch egch egch gch gch gch gch 1 to 5 gchs depending on the trx class gch composed of gch gch gch gch trx all rights reserved alcatel shanghai bell 2007, # m-egch statistical multiplexing rlc

10、header megch header (next segments) megch header (first segment) sync pattern + z bit indicator padding bits crc + tail bits megch header (/nhp and addr byte) dummy filling pdu legend 320 bits320 bits320 bits 320 bits 20 ms 20 ms20 ms gch1 gch2 gch3 gch4 rlc/mac pdu 1 for dbn=x 320 bits gch5 dummy f

11、illing pdu dummy filling dummy filling dummy filling rlc/mac pdu 2 for dbn=x dbn=x+1dbn=xdbn=x+2 megch layer segmentation sub-layer rlc/mac layer megch layer framing sub-layer all rights reserved alcatel shanghai bell 2007, # m-egch statistical multiplexing reduction of the abis and ater consumption

12、 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. 320 bits per gch 20 ms d bn md bn md bn md bn md bn m +

13、 1d bn m + 1 d bn m + 1d bn m + 1 d bn m + 2d bn m + 2d bn m + 2d bn m + 2 20 ms20 ms 320 bits per gch 20 ms d bn md bn md bn md bn md bn m + 1d bn m + 1 d bn m + 1d bn m + 1 d bn m + 2d bn m + 2d bn m + 2d bn m + 2 20 ms20 ms rb1rb1rb1 rb1rb1rb1rb2rb2rb2 rb2rb2rb2 rb2rb2rb3 rb3 rb3 m m - -eg ch lin

14、k com posed of 4 eg ch link com posed of 4 g ch sg ch sm m - -eg ch link com posed of 4 eg ch link com posed of 4 g ch sg ch s rb3 g ch 1g ch 1 g ch 2g ch 2 g ch 3g ch 3 g ch 4g ch 4 g ch 1g ch 1 g ch 2g ch 2 g ch 3g ch 3 g ch 4g ch 4 g ch 1g ch 1 g ch 2g ch 2 g ch 3g ch 3 g ch 4g ch 4 g ch 1g ch 1

15、g ch 2g ch 2 g ch 3g ch 3 g ch 4g ch 4 all rights reserved 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 m ) )c cs sr ra ad di i o on n b b g g c ch h t th hr ro ou ug gh hp pu ut tw w / /o o k kb b/ /s s s st ta at t m m u ux xd d l

16、 lu u l l c cs s- -1 18 810 0, , 7 73 30 0, , 7 73 3 c cs s- -2 21211 11 1 c cs s- -3 314, 421 1, , 2 22 21 1, , 2 25 5 c cs s- -4 42021 1, , 6 61 1, , 6 64 4 m m c cs s- -1 18, 810 0, , 8 86 60 0, , 8 89 9 m m c cs s- -2 211, 211 11 1 m m c cs s- -3 314, 821 1, , 2 28 81 1, , 3 33 3 m m c cs s- -4

17、417, 621 1, , 4 47 71 1, , 5 5 m m c cs s- -5 522, 421 1, , 8 81 11 1, , 8 86 6 m m c cs s- -6 629, 632 2, , 3 31 12 2, , 3 36 6 m m c cs s- -7 744, 843 3, , 3 39 93 3, , 4 49 9 m m c cs s- -8 854, 454 44 4, , 1 14 4 m m c cs s- -9 959, 254 4, , 3 39 94 4, , 4 49 9 n n b b g g c ch h w w i i t th h

18、s st ta at t m m u ux x 01632486480 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 reserved 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 in

19、creased. the algorithms to dynamically decrease or increase the size of an m-egch link correspond to the dynamic abis allocation. all rights reserved 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

20、 gch expenditure：16 gch use statistical multiplexing 1 pdch = 3.49 gch total gch expenditure：14 gch saving12.5 all rights reserved alcatel shanghai bell 2007, # 23 | presentation title | month 2006 2.2 dynamic abis allocation all rights reserved alcatel shanghai bell 2007, # dynamic abis allocation

21、b8: static abis allocationb9: dynamic abis allocation 01762345 egch 01762345 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 basic composed of egch egch egch

22、 egch egch egch egch gch extra basic abis nibbles and extra abis nibbles are statically mapped to a rts. they can only be used in the egch of this rts. gch extra gch extra gch extra gch basic gch extra gch basic gch extra no more constraints in b9! gch basic trx all rights reserved alcatel shanghai

23、bell 2007, # dynamic abis allocation x x x x x x x x x x x x ext ra abi s ni bbl es (num ber of ni bbl es per rts = trx cl ass-1) x x x x basi c abi s ni bbl es b b s s m m m m p p p p t t t t trx conf i gurat i on on t he ai r i nt erf ace legend: b: bc c h , s: st at i c sd c c h , m : m pd c h ,

24、p: pd c h , t: tc h , x x : abi s ni bbl e “ wast ed” i n b8, : abi s ni bbl e used i n b8 in b8, the following abis nibbles were “wasted”: all rights reserved alcatel shanghai bell 2007, # dynamic abis allocation in b9, the following abis nibbles are usable for ps traffic: the basic abis nibbles ma

25、pped 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 p p p p m c c c c c c rtss i n a 2-trx cel l legend: - c c: rts current l y used for c s t raf f i c (c s cal l ) ,

26、- p p: rts current l y used f or ps t raf f i c ( tbf or m pd c h t raff i c) . rts avai l abl e f or ps t raf f i c rts reserved f or c s t raff i c the basi c abi s ni bbl es of t hose rts can be used t o est abl i sh som e g c h s all rights reserved alcatel shanghai bell 2007, # dynamic abis all

27、ocation 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

28、tss of a bts is provided by the bsc to the mfs. all rights reserved 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

29、 the bts. the “bonus” abis nibbles can be used in the m-egch link of any trx of the bts. all rights reserved 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 messa

30、ges 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 reserved alcat

31、el shanghai bell 2007, # 30 | presentation title | month 2006 3 extended uplink tbf mode（b9） all rights reserved 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: q to quickly restart data transmission in ul if higher

32、 layers in the ms deliver new data, without having to re-establish a new ul tbf, after the countdown procedure has started. q 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 ne

33、twork. it also improves the throughput in some cases. the feature applies only for r4 ms all rights reserved alcatel shanghai bell 2007, # b9 extended ul tbf introduce q 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) .

34、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 reserved alcatel shanghai bell 2007, # b9 extended ul tbf introduce q functi

35、onal description 1.enable or disable the extended uplink tbf mode through an o&m parameter, . and configure an inactivity period as duration of extended uplink tbf mode, . 2.indicate to ms that the network supports the extended uplink tbf mode. the ms is aware of the bss capability by the parameter.

36、 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

37、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 inf

38、ormation. apply the if the ms does not support the extended uplink tbf mode or if the bss does not know ms capability. 5.switch to 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

39、 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 expiry all rights reserved alcatel shanghai bell 2007, # b9 extended ul tbf introduce .if ms support exte

40、nded ul tbf mode is known. q 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

41、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 t

42、he extended phase. rlc block, bsn=n, cv=0 msbss puan, ssn=n+1, fai=0 enter tbf extended phase. start t_max_extended_ul all rights reserved alcatel shanghai bell 2007, # b9 extended ul tbf introduce q bss behavior during the extended uplink phase the bss continues to schedule usf, so that the ms is a

43、ble 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 recepti

44、on of an uplink dummy block from the ms shall not cause the n_ul_dummy counter to be incremented. all rights reserved alcatel shanghai bell 2007, # b9 extended ul tbf introduce msbss t_max_extended _ul expiry usf dummy block puan, fai=1, s/p=1 pca tbf is release nominal case q t_max_extended_ul expi

45、ry 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 f

46、or 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. msbss t_max_extended _ul expiry usf radio block, bsn=n+1 usf

47、 radio block, bsn=n+2, etc tbf is active again transfer resumption after timer expiry all rights reserved 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. the pdch supports uplink

48、tbf, which all are in extended mode, , 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: in extended mode on pacch: usf scheduled in extended mode on pacch: usf scheduled i

49、n extended mode on pacch: usf scheduled 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 , is used for all ms in extended phase. a default value is 200ms. the remaining bandwidth is used for ms in transfer. all ri

50、ghts reserved alcatel shanghai bell 2007, # omc-r parameters hmi namedefinitionsub- system insta nce omc-r access typedef value rangeunit en_extended_u l_tbf flag to disable/enable the extended tbf mode feature on the uplink mfscellchangeableflag00,1none t_max_extend ed_ul maximum duration of the ex

51、tended uplink tbf phase mfscellchangeabletimer2000100,4 000 ms en_fast_usf_ul _extended flag to disable/enable the transmission of usf every 20ms in extended mode mfsbsschangeableflag10,1none t_extended_ul _tbf_pol to control the usf scheduling on the uplink when a tbf is in extended tbf mode mfsmfs

52、none (dls)timer200120,5 00 ms all rights reserved 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: l for an uplink message: ms response time + ul transmi

53、ssion time on the radio interface + ul tbf establishment l 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

54、 page as soon as the invoke reply is received all rights reserved alcatel shanghai bell 2007, # example for wap access all rights reserved alcatel shanghai bell 2007, # example for wap access all rights reserved alcatel shanghai bell 2007, # 42 | presentation title | month 2006 4 enhanced packet cel

55、l reselection(b9) all rights reserved alcatel shanghai bell 2007, # introduction q 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 m

56、s. all rights reserved alcatel shanghai bell 2007, # nacc nc2 nacc nc0 packet (p)si status packet psi status packet si status content all rights reserved alcatel shanghai bell 2007, # network assisted cell change (nacc) 服务小区的nacc过程包含两个步骤： ccn mode procedure (cell change notification) 当数据传输模式下发生小区重选时

57、，手机将通知网络侧，延缓小区选择过 程，让bsc决定是否进行小区系统消息发送过程(cell system information distribution ) cell system information distribution 该过程是使在数据传输模式下（ptm）手机得到目标小区的系统消息，使 小区重选完成后能进行initial packet access过程。这些信息是在小区重选完成 前，通过原服务小区发送给手机的。 cell acell acell acell bcell bcell b partial sys info. of cell b all rights reserved

58、alcatel shanghai bell 2007, # network assisted cell change - nc0 (1/2) 当en_nacc =enable，nacc功能对小区下所有支持geran feature package 1 的r4手机开启 (1)t3206监视发送 packet cell change notification 消息. (2)当收到packet cell change notification消息后，mfs 会检查是否这个目标小区 是属于同一个bss，如果 发现源小区和目标小区不 是同一个bss，侧网络将 直接下发packet cell change

59、 contiune消息，并 不发送任何邻小区的系统 消息。 cell bmscell a ongoing data transfer target cell choice (1) t3206 rlc data block polling packet cell change notification (2) packet neighbor cell data (psi14) packet neighbor cell data (psi1) packet neighbor cell data (psi2-first instances) packet neighbor cell data (ps

60、i2-intermediate instances) packet neighbor cell data (psi2-last instances) packet cell change continue (4) t3210 t3208 t3208n retrieval psi instances of the chosen cell (3) the figure above covers the case where there is a pbcch in the target cell. when there is no pbcch channel in the target cell,