Tổng quan công nghệ HSPA+

TF^ Cong nghe-Giai pliap<br /> <br /> <br /> <br /> Tdng q u a n cong nghe HSPA'*'<br /> ThS. N g u y i n Trong Tam<br /> <br /> <br /> <br /> <br /> Birdc tien dau tien cua cong nghe truy nhap v6 tuye'n WCDMA la dUa<br /> ra cong nghe truy nhap goi toe do cao dudng x u o n g HSDPA (High<br /> Speed Downlink Packet Access) trong phat hanh 5. HSDPA da mang<br /> lai nhung tien bo xa hdn trong viec cung cap cac djch vu diir lieu goi<br /> trong WCDMA, ca ve mat he thong lan hieu nang ngUdi dung. Viec<br /> lam tang dOr lieu goi dudng xud'ng cua HSDPA dude hoan chinh bdi<br /> nhung cai tien dudng len (Enhanced Uplink) dUdc gidi thieu trong<br /> phat hanh 6 cua 3GPP/WCDMA. HSDPA va Enhanced Uplink thudng<br /> dUdc goi la HSPA. HSPA+ la ten goi chung cho nhung cai tien cua<br /> HSPA trong 3GPP phat hanh 7. Bai viet se gidi thieu t o n g quan ve kha<br /> nang cung n h u cac uu nhudc diem cua cong nghe nay.<br /> <br /> <br /> <br /> <br /> 1. KHA N A N G C U A HSPA+ • HSPA"*" tang cUdng trai nghiem cho ngUdi<br /> dung dau cudi vdi tdc dp duf lieu dinh cao, tri<br /> HSPA+ la ten gpi mot tap nhifng cai tien cua<br /> thap, thie't lap cupc gpi nhanh, thdi gian cupc<br /> HSPA dupc difa ra trong 3GPP phat hanh 7<br /> (R7). Sau day la mdt so kha nang cua gpi dai hon. HSPA+ hd trp tdc dp dinh dudng<br /> xud'ng tdi 28 Mbit/s (42 Mbps trong phat<br /> HSPA+:<br /> hanh 8) va dudng len 11 Mbit/s. HSPA+ la<br /> • HSPA"*" nhan ddi dung lupng duf lieu so vdi<br /> mdt cai tien mang tinh kinh te nhat cua<br /> HSPA, do dd giam gia thanh cho cac dich vu<br /> HSPA, cho phep cac nha khai thac UMTS suf<br /> duf lieu ddng thdi nang cao nang lUc mang<br /> dung cd hieu qua nhat cd sd ha tang cua hp<br /> bang rong di ddng.<br /> cung nhu la dau tU vao mang, phd tan va thie't<br /> • HSPA+ cung cap dung IPdng thoai thdng<br /> bi. Gidng HSPA, HSPA+ cd the tUdng thich<br /> qua VoIP gap 3 lan so vdi thoai chuyen mach<br /> vdi ca cdng nghe trUdc va sau nd.<br /> kenh trong phat hanh 99 vdi cuing chat lu'png<br /> va ma hda. • HSPA"*" la mdt giai phap tdi Uu vdi sdng<br /> mang 5 MHz, nd cung cap dung lupng thoai<br /> • HSPA"*" VoIP giup tang dung lUdng duf lieu va dijf lieu xap xi LTE trong cuing dai tan 5<br /> trong md hinh hda trpn VoIP va duf lieu, dap MHz va cuing sd anten.<br /> ufng nhu cau ngay cang tang cua dich vu duf<br /> lieu.<br /> <br /> <br /> 38 s o 1/2010 THONG TIN KHKT & KINH TE BUU DIEN<br /> TR Cong nglie-Gial phap<br /> ^ ^<br /> 2 DAC TINH n'lA Hc;PA+ ^^' luong duf lieu trUc giao khi chung dUpc<br /> D' 1 J- ,_ -^ .-' j._ ^, 1 , •) ^' •> truyen tdi UE.<br /> Bang 1 arte ra mpt so aac tinh chu yeu cua<br /> ''•-'''^" Mat khac, trong mdi trUdng nhin<br /> <br /> Dac tinh HSPA-" Loi ich<br /> Cong nghe MIMO 2x2 - Nhan doi tdc dp dii lieu dinh<br /> dudng xuong - Tang dung lupng dudng xuong<br /> DiSu che bac cao HOM - Tdc dp dii' lieu dudng xuong tang 50%<br /> 64QAM dudng xuong, 16 - Nhan doi tdc do dit lieu dudng len<br /> QAM dudng len - Tang dung lupng dudng len va xuong<br /> Ket ndi goi len tuc CPC - Cai thien dung lupng VoIP<br /> DTX/DRX-Hoat dong giam - Tang thdi gian dam thoai len 50%<br /> HS-SCCH<br /> Trang thai hoat dong - Thie't lap cupc gpi nhanh<br /> CELL_FACH nang cao<br /> MBFSN - Tang dung lupng quang ba<br /> <br /> <br /> Bang 1. Cdc ddc tinh chu yeu cua HSPA^<br /> <br /> <br /> thang LoS (Light of Sight), khd cd the bd trd<br /> MIMO cac ludng trUc giao, do dd ma dp ldi MIMO cd<br /> HSPA+ hd trd MIMO 2x2 dUdng gidi ban. MIMO mang lai ldi ich Idn nhat<br /> xud'ng, sd dung hai anten phat d Node B de trong mdi trUdng dd thi vi tan xa td't va kich<br /> truyen ludng duf lieu trufc giao tdi hai anten thu thudc d nhd. Cdn vdi mdi trUdng ndng thdn<br /> d phia thie't bi ngUdi suf dung UE (User vdi kich thudc d Idn va tan xa it, MIMO khdng<br /> Equipment). Suf dung hai anten cdng them xuf mang lai ldi ich to Idn.<br /> ly tin hieu so b ca hai phia thu phat, MIMO cd<br /> the tang dung iPdng cua he thd'ng va nhan ddi Dieu che bac cao HOM (High Order<br /> tdc dp dCf lieu ma khdng can tang cdng suat d Modulation)<br /> Node B hoac bang thdng. HSPA R6 ho trp dieu che 16 QAM<br /> tren dUdng xud'ng va QPSK tren dUdng len.<br /> Trong nhufng dieu kien nhat dinh, duf HSPA+ ap duing 64-QAM tren dUdng xud'ng,<br /> lieu trong he thd'ng MIMO 2x2 cd the dUdc lam tang tdc dp dtJf lieu len 50% cho UE ma<br /> phat tren hai luong trufc giao. De cd hieu qua ty so SNR van gitJ b miic cao. Tren dUdng len,<br /> nhat, MIMO can Ty sd tin hieu tren tap am dieu che 16- QAM nhan ddi tdc dp duf lieu<br /> SNR (Signal to Noise Ratio) cao b UE va mdi cho UE . Tin hieu dPdc phat di vdi dieu che<br /> trUdng tan xa ly tudng. SNR cao dam bao cho bac cao hdn thi nhay vdi nhieu hon va yeu cdu<br /> UE cd the giai ma thanh cdng tin hieu de'n SNR cao hon b phi'a thu de cd the giai dieu<br /> trong khi cdng suat dUdc phan deu tren hai che thanh cdng. HOM lam tang dang ke tdc<br /> anten. Mdi trUdng tan xa ly tudng dam bao dp duf lieu cho ngUdi diing trong nhuPg dieu<br /> <br /> <br /> THONG TIN KHKT & KINH TE BUU DIEN so 1/2010 39<br /> ^<br /> Cong nghe-Giai phap<br /> t^l^<br /> kien td't. Do do, lufu lupng cho nhifng ngUdi len cung rat quan trpng, bdi vi viec giam sat<br /> diing cd SNR cao ie dUdc phuc vu nhanh lien tuc kenh HS-SCCH lam tieu ton cdng<br /> hdn. Trong kich ban LOS, HOM se bii lai dp suat cua UE. Do dd, cac dac tinh cua CPC dUci<br /> Ipi ma MIMO bi gidi ban. ra de giam ca tieu de cho kenh dieu khien<br /> dudng len va dudng xud'ng.<br /> Ket noi goi lien tuc CPC (Continuous<br /> Packet Connectivity) Phdt khong lien tuc dudng len DTX<br /> CPC bao gom mot vai dac tinh vdi (Discontinuous Transmission)<br /> muc dich tdi ufu hda suf hd trp cho ngUdi diing<br /> DTX lam giam tieu de kenh dieu khien<br /> duf lieu gdi trong mang HSPA. Vdi viec gia<br /> dudng len. Nd cho phep UE ngifng phat tren<br /> tang cac dich vu duf lieu gdi, mdt so lufdng Idn<br /> kenh DPCCH dUdng len trong khi khdng cd<br /> ngUdi suf dung phai dUdc hd trd trong mot d.<br /> hoat ddng truyen dan tren kenh E-DCH va<br /> Hp phai dupc duy tri ke't nd'i trong mdt thdi<br /> HS-DPCCH. Do dd DTX tang dung lupng<br /> gian dai, mac dii cd the hp chi d trang thai<br /> dudng len bang each giam nhieu dUdng len d<br /> truyen duf lieu tich cUc trong mdt thdi gian nao<br /> Node B. Dong thdi DTX cd the tie't kiem<br /> dd. Do dd, cac ke't nd'i phai dupc duy tri, ddng<br /> cdng suat, vi the keo dai tudi tbp cho pin.<br /> thdi phai tranh bi ngat ke't nd'i va tai thie't lap<br /> ket ndi de ngUdi suf dung cam nhan dUdc tri<br /> la nhd nhat. Mac dii kenh DPCCH dudng len<br /> khdng dUdc phat lien tuc, nhufng nd viin dUdc<br /> phat trong mot vai thdi diem theo mau da biet<br /> Viec duy tri cac ke't nd'i vdi so lUdng<br /> trUdc. Hoat ddng nay muc dich de duy tri<br /> ngUdi diing trong mdt d Idn cd nghia la cac<br /> dong bd va dieu khien cdng suat. Trong<br /> kenh dieu khien b dudng xud'ng va dUdng len<br /> trudng hpp E-DCH va HS-DPCCH suf dung,<br /> can dupc bd trd. Cac kenh dieu khien dudng<br /> thi DPCCH dudng len se dUpc phat song<br /> len dac biet quan trpng de dam bao dong bd.<br /> Tuy nhien, chung lai gdp phan tang nhilu song.<br /> dPdng len bao gdm ca kenh dieu khien vat ly De linh boat hon, hai mau boat ddng<br /> rieng DPCCH (Dedicated Physical Control DPCCH dudng len dugc diia ra vdi mdi UE:<br /> <br /> <br /> Tdc do dir lieu dinh MIMO (2x2 DL MIMO) Khong MIMO<br /> HSPA*<br /> Dudng xudng 28Mbps(16-QAM) 14Mbps(16-QAM)<br /> 21 Mbps (64-QAM)<br /> Dudng len 5,76 Mbps (QPSK) 5,76 Mbps (QPSK)<br /> 11 Mbps(16-QAM) llMbps(16-QAM)<br /> Bang 2. Toe do du lieu HSPA+<br /> <br /> Channe) va kenh vat ly dieu khien rieng tdc dd<br /> • UE DTX chu ky 1<br /> cao HS-DPCCH (High Speed DPCCH). Vi<br /> • UE DTX chu ky 2<br /> vay, muc dich cua CPC la giam thdng tin tieu<br /> UE DTX chu ky 2 dUpc suf dung kbi khdng cd<br /> de cho kenh dieu khien dudng len cua ca<br /> boat ddng truyen duf lieu . UE DTX chu ky 1<br /> DPCCH va HS-DPCCH. Ngoai ra, viec giam<br /> dUdc sii dung tam thdi phu thudc vao khoang<br /> thdng tin tieu de cho kenh dieu khien dPdng<br /> <br /> <br /> 40 so 1/2010 THONG TIN KHKT & KINH TE BUU DIEN<br />  Cong nghe-Giai phap<br /> <br /> ^ ^<br /> thdi gian khdng boat ddng cua E-DCH. Sau<br /> Birdc I: Khdi tao tmydn dSn<br /> qua trinh truyen din dudng len cudi ciing tren<br /> kenh E-DCH, UE se chd trong mdt khoang Kh6ng!!S-SCai<br /> thdi gian, dupc gpi la "ngUdng khdng hoat<br /> ddng^ciia UE DTX chu ky 2", sau dd nd se Kh6itniyenfaitren!lS-DSCH ) fe'i<br /> chuyen sang DTX chu ky 1.<br /> <br /> Thu khong lien tuc dudng xuong DRX ACK hoyc DTX<br /> <br /> Trong HSPA phat hanh 5, UE phai Birijc 2: Truyen lai lan 1<br /> duy tri kenh HS-SCCH lien tuc de theo ddi dtf HS-SCCH loai 2<br /> lieu dudng xud'ng. Trong HSPA+, mang cd<br /> Khtii Iraycn tiii tren HS-DSCH<br /> the gidi ban phan khung ma d dd UE giam sat<br /> kenh HS-SCCH de lam giam cdng suat tieu<br /> ton cua UE. Hoat ddng DRX dupc dieu khien ACK hoac NACK.<br /> bc^ tham sd chu ky UE_DRX, vdi cac gia tri cd<br /> the cd la 4, 5, 8, 10, 16, hoac 20 phan<br /> khung. Vi du, ne'u chu ky UE_DRX la 5 phan Budc 3; Truy6i lai iin 2<br /> khung, thi cuf sau 5 phan khung UE phai duy ILS-SCCM loai 2<br /> tri kenh HS-SCCH. Khoi truy6n tai tren HS-DSCH ) Ph<br /> <br /> DRX cung tac ddng de'n viec duy tri<br /> kenh dieu khien dudng xud'ng E-RGCH va E- ACK hoftc NACK<br /> AGCH. Nhin chung, khi viec truyen duf lieu<br /> dudng len dang tie'p diln hoac viia mdi ke't Hinh 3: Hoat ddng giam HS-SCCH<br /> thuc, UE se phai giam sat cac kenh nay. Ne'u<br /> khdrig cd dCf lieu dudng len va qua trinh Identifier) tren kenh HS-SCCH. Ngay khi UE<br /> truyen din cudi ciing vach ra mdt ngUdng thdi nhan biet cac thdng tin dieu khien lien quan<br /> gian, thi UE cd the ddng viec giam sat cac tren HS-SCCH, nd se chuyen tdi tai nguyen<br /> kenh nay. HS-PDSCH va nhan duf lieu gdi. So do nay<br /> ve CO ban se thay dd'i trong che dp boat ddng<br /> Chu y la DRX dudng xud'ng chi cd the giam HS-SCCH. Hoat ddng nay dufpc tdi ufu<br /> thuc hien dUpc khi DTX boat ddng. Hoat hda cho cac dich vu gdi nhd nhu VoIP. Tram<br /> ddng nay giup tiet kiem cdng suat cho pin. gdc se quyet dinh cho tifng gdi b che do gi^m<br /> HS-SCCH hay khdng, cd nghia la che dp<br /> Che do hoat dong giam HS-SCCH thudng vin dUdc thufc hien. Nguyen ly cua<br /> boat ddng nay dUpc mieu ta trong hinh 1.<br /> Che do boat ddng giam HS-SCCH la<br /> mot che dp dac biet, nd lam giam tieu de HS- Trang thdi CELL_FACH ndng cao<br /> SCCH va ban che suf tieu to'n cdng suat cho LUu lUdng duf lieu dinh thUdng bung<br /> UE. Nd thay dd'i cau true thdng thudng cua nd trong nhung thdi diem dac biet. Ve phia<br /> viec nhan dif lieu HSDPA. Thdng thUdng, UE hieu nang ngUdi dung, dieu nay thuan loi<br /> se dpc lien tuc tren kenh HS-SCCH. UE dupc trong viec cau hinh HS-DSCH va E-DCH mdt<br /> danh dia chi thdng qua nhan dang UE (16 bit each nhanh chdng de cd the phat di duf lieu<br /> H-RNTI /HSDPA Radio Network Temporary ngudi dung. Ve phia mang, se khdng the<br /> <br /> THONG TIN KHKT & KINH TE BUU DIEN SO 1 / 2 0 1 0 41<br /> TR Cong nghe-Giai phap<br /> c^i^<br /> tranh difpc nhilu trong dudng len tif DPCCH vdi tdc dp cao, dong thdi nd lai tieu ton cdng<br /> tham chi khi khdng cd diJf lieu truyen di. Ve suat UE Idn nhat. Bao hieu RRC dUdc suf dung<br /> phia UE, viec tieu tan cdng suat la van de de chuyen UE sang cac trang thai khac nhau.<br /> quan tam chinh. Tham chi khi khdng nhan duf<br /> lieu thi UE vin can phat DPCCH va giam sat >. KET LUAN<br /> HS-SCCH. Cac ufu diem cua cdng nghe HSPA+ la<br /> De giam bdt cdng suat tieu tan cho kha rd rang, song khi ap dung can can nhac<br /> UE, WCDMA cuing nhu cac he thd'ng te bao de'n cac md hinh mang thufc te de phat huy tdi<br /> khac, cd mdt so trang thai: URA_PCH, da cac ufu diem nay. Hien nay so IPdng mang<br /> CELL_PCH, 'CELL_FACH va CELL_DCH. GSM vin chiem chu dao, nen rd rang cac<br /> Cdng suat tieu tan se tha'p nhat khi UE thudc cdng nghe tUdng lai nhU HSPA-i- se la mdi<br /> mot trong hai trang thai dac biet, CELL_PCH quan tam Idn cua cac nha mang tren toan<br /> va UF^_PCH. Trong nhufng trang thai nay, cau.<br /> UE "ngu" va chi "thufc day" khi kiem tra ban<br /> tin. De trao ddi duf lieu, UE can chuyen sang ^/-.i UEU THAM KHAC<br /> trang thai CELL_FACH hoac CELL_DCH.<br /> [1]. Ari Hotimen, Olav Tirkkonen, Risto<br /> Trong CELL_FACH, UE can phat di Wichman, Multi Antenna Transceiver for<br /> mdt khdi dCf lieu nhU mdt phan trong thu tuc 30 and Beyond, John Wiley &Son,2003.<br /> truy nhap nglu nhien. UE cung giam sat cac [2]. Harri Holma, Antti Toskala, WCDMA for<br /> kenh dudng xud'ng chung va bao hieu RRC. UMTS- HSPA evolution and LTE, Wiley,<br /> Trang thai boat ddng truyen dan cao dUdc gpi 2007.<br /> la CELL_DCH. Trong trang thai nay, UE cd [3]. 3 G P P T S 2 5 . 2 1 1 , Physica/channels and<br /> the suf dung HS-DSCH va E_DCH de trao ddi Mapping of Transport channels onto physi-<br /> duf lieu vdi mang. Trang thai nay cho phep cal channels (FDD), Release 7.<br /> truyen mdt khdi iPdng Idn duf lieu ngUdi dung<br /> <br /> <br /> <br /> <br /> Vinaphone 0au tir 70 trieu USD mor rong vung phu song 2G<br /> Vinaphone viia ky ket ban hdp dong tri gia 70 trieu USD vdi Motorola nham tiep tuc<br /> md rong viing phii sdng 2G. Nhu vay, ben canh vi^c md rong cung cap cac dich vu 3G,<br /> Vinaphone khdng ngdng nang cao chat lufdng mang 2G<br /> Theo do, trong 2 nam tdi, Motorola giup VinaPhone trien khai th^m hdn 3.000<br /> tram thu phat sdng 2G cho cac tinh mien Bac va mien Nam, dac biet la tai cac thanh phd<br /> ddng dan nhu Ha Ndi va TP. Ho Chi Minh.<br /> Ban hdp dong nay se giup mb rong dien phii sdng va tang cUdng kha nang cua<br /> mang GSM cua VinaPhone, dap ling dufdc nhu cau ngay cang tang cua khach hang.<br /> Trong nhieu nam qua, Motorola da cd nhieu boat ddng hdp tac, hd trp Vinaphone<br /> trien khai mang 2G va 3G. Gan day nhat la vao nam 2008, Vinaphone va Motorola cuing<br /> da ky hdp dong md rong he thd'ng mang tri gia 28 tri$u USD.<br /> Theo: Vinaphone<br /> <br /> <br /> <br /> 42 SO 1 / 2 0 1 0 THONG TIN KHKT & KINH TE BUU BIEN<br />