tailieunhanh - Wcdma for umts radio access for third genergation mobile communacations phần 3

WIMS W-CDMA là không dựa trên công việc bắt nguồn từ một công nghệ thế hệ thứ hai hiện tại, nhưng được đề nghị một công nghệ thế hệ thứ ba không có liên kết trực tiếp với bất kỳ tiêu chuẩn thế hệ thứ hai. | Background and Standardisation of WCDMA 67 The cdma2000 multicarrier option is covered in more detail in Chapter 14 as standardised by 3GPP2. The WIMS W-CDMA was not based on work derived from an existing second generation technology but was a new third generation technology proposal with no direct link to any second generation standardisation. It was based on the constant processing gain principle with a high number of multicodes in use thus showing some fundamental differences but also a level of commonality with WCDMA technology in other forums. WP-CDMA WP-CDMA Wideband Packet CDMA resulted from the convergence between W-CDMA N A of T1P1 and WIMS W-CDMA of in the US. The main features of the WIMS W-CDMA proposal were merged with the principles of W-CDMA N A. The merged proposal was submitted to the ITU-R IMT-2000 process towards the end of 1998 and to the 3GPP process at the beginning of 1999. Its most characteristic feature compared with the other WCDMA-based proposals was a common packet mode channel operation for the uplink direction but there were also a few smaller differences. Creation of 3GPP As similar technologies were being standardised in several regions around the world it became evident that achieving identical specifications to ensure equipment compatibility globally would be very difficult with work going on in parallel. Also having to discuss similar issues in several places was naturally a waste of resources for the participating companies. Therefore initiatives were made to create a single forum for WCDMA standardisation for a common WCDMA specification. The standardisation organisations involved in the creation of the 3rd Generation Partnership Project 3GPP 9 were ARIB Japan ETSI Europe TTA Korea TTC Japan and T1P1 USA . The partners agreed on joint efforts for the standardisation of UTRA now standing for Universal Terrestrial Radio Access as distinct from UTRA UMTS Terrestrial Radio Access from ETSI also .

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