5.2 Uplink Carrier Aggregation Principle
The Release 8 uplink maximum bandwidth is 20 MHz and then a UE is transmitting that as contiguous resource block allocation with n times 180 kHz as discussed in Chapter 3. In Release 10 the uplink carrier aggregation principle is to enable the UE to transmit on multiple uplink carriers simultaneously, as shown in the Figure 5.1 for the FDD two uplink carriers case with a single downlink carrier. Depending on the spectrum allocation the uplink carrier aggregation use can be divided to three categories as follows:
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