【正文】 4 QAM for HSDPA,‖ 3GPP R1063335, Nov. 2021. [5] H. Holma and A. Toskala, Eds., WCDMA for UMTS: HSPA Evolution and LTE, 4th ed., Wiley, 2021. [6] J. Kurjenniemi et al., ―Performance of WCDMA HSDPA Network with Different Advanced Receiver Perations,‖ Wireless Personal Multimedia Commun., Aalb, Denmark, Sept. 17–22, 2021. [7] 3GPP, ―Further Discussion on Delay Enhancements i Rel7,‖ 3GPP R2061189, Aug. 2021. [8] 3GPP, ―High Speed Downlink Packet Access (HSDPA)。外文資料原 HighSpeed Packet Access Evolution in 3GPP Release 7 ABSTRACT Highspeed packet access (HSPA) was included in Third Generation Partnership Project(3GPP) releases 5 and 6 for downlink and for uplink. The 3GPP release 7 offers a number of HSPA enhancements, providing major improvements to the enduser performance and to work efficiency. The release 7 features are introduced in this paper. Release 7 also is known as HSPA evolution or HSPA+. The HSPA+ downlink peak bit rate can be increased to Mbps with a multiple input multiple output (MIMO) antenna solution, and the uplink rate can be increased to Mbps with higher order modulation in release 7. The higher peak rates are facilitated by the layer 2 optimization in downlink. In addition, the terminal power consumption can be reduced considerably for packet applications. The downlink cell capacity will be enhanced with new types of terminal requirements for a twoantenna equalizer and with MIMO. Altogether, release 7 features nearly double the cell capacity pared to release 6 with emphasis on the capacity of voiceoverIP (VoIP) service. 3GPP release 7 enables the simplification of the work architecture. The number of work elements for the user plane can be reduced from four in release 6 to two in release 7. The HSPA flat architecture in release 7 is similar to the architecture agreed upon for 3GPP long term evolution (LTE), thus enabling the later ,smooth evolution from HSPA to LTE. LTE will be specified as part of release 8 and further push the radio capabilities higher with larger bandwidth and lower latency. The LTE performance target is to provide twotofour times the performance of the HSPA release 6 reference case [1]. 3GPP release 7 and 8 solutions for the HSPA evolution will be worked in parallel together with the LTE development, and some aspects of the LTE work are expected to reflect on the HSPA evolution as well. 3GPP release 7 was pleted in June 2021 ,with some work remaining on the performance requirements. Commercial deployment and devices are expected by 2021. INTRODUCTION The Third Generation Partnership Program(3GPP) specifications included major improvements in downlink data rates and capacity in release 5 with the introduction of highspeed downlink packet access (HSDPA) in 2021. Similar technical solutions were applied to the uplink direction as part of the release 6 with highspeed uplink packet access (HSUPA) at the end of 2021. HSDPA and HSUPA technologies are described in [2]. 3GPP release 7 in June 2021 pleted a number of additional and substantial enhancements to the enduser performance, to the cell throughput, and to the work architecture. The detailed 3GPP release 7 solutions and their performance benefits are summarized in this paper. CONSUMPTION REDUCTION WITH CONTINUOUS PACKET CONNECTIVITY The technology evolution, in general, helps to decrease the mobile terminal power consumption. Also, the fast and accurate power control in wideband code division multiple access(WCDMA) helps to minimize the transmitted power levels. The challenge in 3GPP fromrelease 99 to release 6 is still the continuous reception and transmission when the mobile terminal is using HSDPA/HSUPA. 3GPP release 7 introduces a few improvements to HSDPA/HSUPA that help to reduce the power consumption for packet services like browsing and voiceoverIP (VoIP). 3GPP release 6 mobile terminal keeps transmitting the physical control channel even if there is no data channel transmission. Release 7 mobile terminal cuts off the control channel transmission when there is no data channel transmission, allowing it to shut down the transmitter pletely. This solution is called discontinuous uplink transmission, and it brings clear savings in transmitter power consumption. A similar concept also is introduced in the downlink, where the terminal must wake up only occasionally to check if the downlink data transmission is starting again. The terminal can use the powersaving mode during other parts of the frame if there was no data to be received. This solution is called downlink discontinuous reception. The discontinuous transmission concept is illustrated in Fig. 1 for Web browsing. As soon as the Web page is downloaded, the connection enters discontinuous transmission and reception. The estimated savings in mobile terminal power consumption are shown in [3]. The power consumption of the radio modem ideally can be reduced by more than 50 percent when the user is reading the Web page. The difference in the actual operation times will be smaller because there are other ponents — such as display and application processor — taking some power, but there will still be major benefits in the mobile terminal operation times. PEAK DATA RATE INCREASE WITH MIMO AND HIGHER ORDER MODULATION The downlink peak data rate with release 6 HSDPA is Mbps, with 3/4 coding and Mbps, without any channel coding. In theory, there are a number of ways to push the peak data rate higher: larger bandwidth, higher order modulation, or multiantenna transmission with multiple input multiple output (MIMO). MIMO and higher order modulation are included into HSPA evolution in release 7. 3GPP long term evolution (LTE) also enables larger bandwidth, up to 20 MHz. The 3GPP MIMO concept, for HSDPA operation in release 7, e