#3gpp2

[darekas]

フラグメントを結合したり あるいはFFmpegで、auの携帯電話で作成した3GPP2ファイルを変換すると、（本来の再生時間はもっと長い筈なのに）最初の15秒しか変換されない場合があったりしますが、この現象もMP4Boxを使って解消できます。 この現象は3GPP2の特徴のひとつであるムービーフラグメントに因るものですが（ムービーフラグメントについては MP4/3GPP/3GPP2ファイルフォーマットの基礎知識の、moofボックスの説明をご覧ください）。フラグメントなファイルをMP4Boxで-addとかした出力は（明示的に指定しない限り）フラグメントが結合されるので、FFmpegでもきちんと変換できるようになります。

unoh.github.com by unoh

[darekas]

FFmpegで変換した3GPP動画をNTTドコモiモーションのストリーミング再生に対応させる (for Linux) Thu Nov 01 02:19:06 -0700 2007

> MP4Boxの使い途あれこれ > フラグメントを結合したり

[darekas]

MP4/3GPP/3GPP2ファイルフォーマットの基礎知識 Tue Sep 11 20:00:00 -0700 2007

[pedese-blog]

EV-DO technological gradual progress development analysis

A foreword

Release the data newly according to CDG, the present global CDMA number of users has already been up to 490 million, already there is Veriozon in the whole world, operators such as Sprint, KDDI, China Telecom, LG Telecom, Telus Mobility, Skytel,etc. have disposed 70 HRPD Rev.A business networks, 38 networks, in arrangement, HRPD number of users up to 120 million. With the development of data traffic of the multimedia, various new business forms are emerging constantly, user's requirements for system bandwidth are improving constantly too, in order to pursue the peak value speed of more high business, and with the contending of HSPA, some CDMA operators (such as KDDI, China Telecom) Having already made to the upgrading plan of HRPD Rev.B, and some operators plan to turn from HRPD Rev.A to LTE directly.

2 HRPD technological gradual progress

2.1 Standard gradual progress route

HRPD is the technology of 3GPP2 standard camp, its standard gradual progress route:

Fig. 1. Standard gradual progress route HRPD

In the street map, HRPD develops along the route gradual progress of Rev A, Rev B, Rev C from edition 0:

Speed of the previous, reverse crest value that Rev 0 supports is 2.4Mbps and 153.6kbps respectively. The proposition of this edition is for offering the high-speed data traffic, is mainly for Best Effort business, especially not download business development at a high speed for being symmetric.

Speed of the previous, reverse crest value that Rev A supports is 3.1Mbps and 1.8Mbps respectively, this edition has strengthened QoS controlling mechanism, have reduced time delay (low transmission delay, low and switched over time delay) ,Support VoIP, the videophone (VT) , real-time nature, low time delay business such as PTC.

Rev B standard was released in March of 06, this edition adopted multi-carrier technology, the speed achievable 73.5Mbps and 27Mbps of the previous, reverse crest value (truss up 15 carriers) . The characteristic of EV-DO Rev B is that the multi-carrier is trussed up, introduce the modulation modes (64QAM) of the higher steps in the forward direction And bigger Bao Chang (6144bits, 7168bits, 8192bits) ,The forward direction peak value speed of the single carrier can reach 4.9Mbps, the reverse peak value speed of the single carrier is constant, it is still 1.8Mbps. RevB technical adoption can improve users' business speed (wave number * of year Peak value speed of the single carrier) ,Help users to use the improvement that is experienced. There are two kinds of EV-DO REV A in ways of RevB gradual progress:

1) On the basis of the gradual progress of CSM6800

The original Rev.A system does not need hardware staging, only needs to carry on the upgrade of the software to BTS and BSC. This kind of staging way does not support 64QAM high-order modulating and DTX/DRX, the forward direction peak value speed of the single carrier is the same as DO RevA, it is 3.072Mbps.

2) On the basis of the gradual progress of CSM6850

The original RevA system needs to change BTS letter microchannel plate to believe the microchannel plate for CSM6850 chip, and carry on the upgrade of the software to BTS and BSC. This kind of staging way supports 64QAM high-order modulating and bigger Bao Chang (6144bits, 7168bits, 8192bits) , the forward direction peak value speed of single carrier is 4.9Mbps, the chip supports DTX/TRX, allows to terminally turn off PA, Tx/Rx periodic line while there is no data transmission, can lengthen the life time of the battery.

Rev C standard, 3GPP2 standard organization works in the relevant canonial formulation at the beginning of March of 09, adopts technology such as OFDM, MIMO, Closed-Loop MTD, the speed of downstream crest value supported is 18.74Mbps/1.25MHz, the speed of reverse crest value is 4.3Mbps/1.25MHz, plans to release in February of 2010.

UMB standard, 3GPP2 once carried on relevant canonial formulation, and released the air interface standard C.S0084 - 0 v1.0 of UMB formally in the second quarter of 2007, because another one and UMB even 3GPP standard LTE have obtained support of most operators, here on UMB or question to LTE gradual progress, every master CDMA runs the commercial city and is inclined to to LTE gradual progress. 3GPP2 standard organization gave up UMB standard formally at the end of last year.

In another standard camp - 3GPP, along HSDPA(R5) with HRPD even standard technology , HSUPA(R6) , HSPA + (R7, R8, R9) Route gradual progress,the a among them second stage one HSPA + standard (R8 standard) Distribute already, three-stage standard in formulation (R9 standard) . HRPD and HSPA master technical indicator comparison is as follows:

Table 1. HRPD and HSPA major indicator compared and analysed 2.2 HRPD network gradual progress developed

Though HRPD canonial development is to begin from Rel0, goes through Rev A, RevB, RevC forward gradual progress to develop, but the enhancement of HRPD Rel0 because of HRPD Rev.A, will stride HRPD Rel.0 and dispose HRPD Rev.A network directly in the operation commercial city that just began to dispose HRPD network after 2006, HRPD Rev.B mainly adopts the multi-carrier to truss up technology and further promote the speed of crest value on the basis of HRPD Rev.A, to the choice of Rev.B network, have different choices to each run the association of dealers in the staging, some operators do not consider planning to turn from HRPD Rev.A network to LTE directly to the staging of HRPD Rev.B, every master CDMA operator has not considered to HRPD Rev.C gradual progress at present. So, the gradual progress of HRPD network will be developed:

Fig. 2. Network gradual progress route HRPD