Chapter 4 Background and Standardization of WCDMA
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Transcript of Chapter 4 Background and Standardization of WCDMA
4.6 Creation of 3GPP4.7 How does 3GPP Operate?4.11 Beyond 3GPP Release ’99
The standardization organizations involved in the creation of the 3rd Generation Partnership Project (3GPP)◦ ARIB (Japan)◦ ETSI (Europe)◦ TTA (Korea)◦ TTC (Japan)◦ T1P1 (USA)
Figure 4.2: the manufacturers and operators that are members of 3GPP through the respective standardization organization
1999, CWTS (the China Wireless Telecommunication Standard Group)◦ joined 3GPP and contributed technology from TD-
SCDMA, a TDD-based CDMA 3G technology already submitted to ITU-R earlier
3GPP also includes market representation partners◦ GSM Association◦ UMTS Forum◦ Global Mobile Suppliers Association◦ IPv6 Forum◦ Universal Wireless Communications Consortium
(UWCC)
3GPP◦ the end of 1998
initiated formally◦ early 1999
detailed technical work was started◦ the end of 1999
the first version of the common specification, Release ’99
Within 3GPP, four different technical specification groups (TSGs) were set up◦ Radio Access Network TSG
the one most relevant to WCDMA technology◦ Core Network TSG◦ Service and System Aspects TSG◦ Terminals TSG
Radio Access Network TSG (RAN TSG) has been divided into four different working groups (WGs) (Figure 4.3)
During 2000◦ further work on GSM evolution was moved from
ETSI and other forums to 3GPP◦ including work on GPRS and EDGE◦ a new TSG, TSG GERAN was set up for this
purpose
In 3GPP the work is organized around work items◦ define the justification and objective for a new
feature For a smaller topic
◦ only a single work item in one working group if the impacts are limited to that group
For bigger items◦ such as HSDPA◦ there were work tasks done for each of the four
RAN working groups◦ these work tasks were under a common work
item, named HSDPA For a larger topic
◦ a feasibility study is needed before the decision of actually creating a work item
Feasibility study◦ simply focus on the pain vs. gain ratio of the new
feature◦ comparing the advantages and the resulting
impacts on the equipment and existing features (backwards compatibility)
For each work item a reporter is nominated◦ who has the responsibility of coordinating the
work and reporting the progress from WGs to TSG level
At TSG level◦ every meeting (called a plenary) monitors
progress every three months and makes any necessary synchronization between working groups and TSGs
If a work item is determined not to have reached the expected target◦ it may be altered or removed from the work
program
Once the work item is completed in all working groups◦ Change Requests (CRs) are brought to the
plenary for approval◦ CRs contain the changes needed in each
particular specification◦ once the plenary level approval is obtained, the
specification will be updated to a new version with the changes resulting from the new feature
The simplified illustration of the process from feasibility study to specification finalization is shown in Figure 4.4
Release 3 (Release ’99) March 2001
◦ Release 4 (Release 2000) contains only minor adjustments with respect to Release 1999
◦ Release 4 specifications contain robust IP header compression suitable for cellular transmission to enable an efficient Voice over IP (VoIP) service
March 2002◦ Release 5◦ bigger items included are High-Speed Downlink
Packet Access (HSDPA) and IP-based transport layer
Release 6◦ Multimedia Broadcast Multicast Service (MBMS)◦ HSDPA-related enhancements for uplink◦ radio resource management supporting
measurements for beamforming