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DC-HSDPA與HSDPA區(qū)別

提問者: pengwc 提問時間: 2012-08-27

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問題答案 ( 6 )

http://gg1fic3.cn/bbs/thread-264251-1-1.html

回答者： qwerrazxs 回答時間：2012-08-28 00:19

1、
HSDPA（High Speed Downlink Packet Access)高速下行分組接入，是一種移動通信協(xié)議，亦稱為3.5G(3½G)。該協(xié)議在WCDMA下行鏈路中提供分組數(shù)據(jù)業(yè)務(wù)，在一個5MHz載波上的傳輸速率可達8-10 Mbit/s（如采用MIMO技術(shù)，則可達20 Mbit/s）。在具體實現(xiàn)中，采用了自適應(yīng)調(diào)制和編碼（AMC）、多輸入多輸出（MIMO）、混合自動重傳請求（HARQ）、快速調(diào)度、快速小區(qū)選擇等技術(shù)。
2、 Dual-Cell HSDPA (also known as: Dual-Carrier HSPA or Dual-Cell HSPA) is a wireless broadband standard based on HSPA that is defined in 3GPP UMTS release 8.
Dual Cell (DC-)HSDPA is the natural evolution of HSPA by means of carrier aggregation in the downlink^[1]. UMTS licenses are often issued as 10 or 15 MHz paired spectrum allocations. The basic idea of the multicarrier feature is to achieve better resource utilization and spectrum efficiency by means of joint resource allocation and load balancing across the downlink carriers.
An advanced HSPA network can theoretically support up to 28 Mbit/s and 42 Mbit/s with a single 5 MHz carrier for Rel7 (MIMO with 16QAM) and Rel8 (64-QAM + MIMO), in good channel condition with low correlation between transmit antennas. An alternative method to double the data rates is to double the bandwidth, i.e. 10 MHz by using DC-HSDPA. Additionally, some diversity and joint scheduling gains can also be expected ^[2] with improved QoS for end users in poor environment conditions where existing techniques such as MIMO spatial multiplexing cannot be used to increase data rates. In 3GPP a study item was completed in June 2008. The outcome can be found in a technical report ^[3]. New HSDPA UE categories 21-24 have been introduced that support DC-HSDPA. DC-HSDPA can support up to 42Mbit/s, but unlike HSPA, it does not need to rely on MIMO transmission.
From Release 9 onwards it will be possible to use DC-HSDPA in combination with MIMO used on both carrier^[4]. The support of MIMO in combination with DC-HSDPA will allow operators deploying Release 7 MIMO to benefit from the DC-HSDPA functionality as defined in Release 8. While in Release 8 DC-HSPDA can only operate on adjacent carriers, Release 9 allow that the paired cells can operate on two different frequency bands.
【中文介紹http://gg1fic3.cn/bbs/thread-264251-1-1.html】

qwerrazxs 2012-08-28 00:21

HSDPA就是普通的R5/R6版本的數(shù)據(jù)業(yè)務(wù)。用單載波的HS-DSCH信道承載數(shù)據(jù)業(yè)務(wù)。
DC-HSDPA就是用2個載波的HS-DSCH信道承載數(shù)據(jù)，要求是這兩個載波的帶寬間隔是相鄰的，也就是5Mhz，配置主輔載波，一般低載頻的配為住載頻，高載頻的配為輔載頻。福載波只有業(yè)務(wù)信道沒有公共信道。一般速率能提高1倍，最高能達到43Mbps。

回答者： Richer 回答時間：2012-08-28 00:51

目前有哪些設(shè)備廠家支持該技術(shù)？