name: NAK
full_form: Not Acknowledged
context: Figure 56 and Figure 57 show the FER versus Ior/Ioc for QPSK modulation in a 1-path Rayleigh with vehicle speed of 3kmph and 120kmph respectively. Figure 58 and Figure 59 show the FER versus Ior/Ioc for 16QAM modulation in a 1-path Rayleigh with vehicle speed of 3kmph and 120kmph respectively. Notice that with ideal channel estimation (ICE), the FER performance at higher vehicle speed is better than that at lower vehicle speed for both QPSK and 16QAM due to more un-correlated errors at higher speed. However, for the higher speed case, the channel estimation errors are generally large due to the time-variant behaviour of the channel. Such channel estimation errors may dramatically degrade the performance as shown in the figures. For higher modulation, such as 16QAM and 64QAM, the channel estimation accuracy is more important because of the close signal constellation and both phase and magnitude related soft input calculation. Figure 56. FER versus Ior/Ioc , R=1/2 QPSK, 3 kmph Figure 57
description: The Not Acknowledged (NAK) message is a single-bit signaling information sent from the User Equipment (UE) to the NodeB when an error is detected in the transport block set received on the associated HS-DSCH. This message is part of the ACK/NAK signaling mechanism used for error detection and correction in the HSDPA Shared Information Channel (HS-SICH).
explanation: The context describes NAK as a specific type of message transmitted between network entities (UE and NodeB) to indicate an error, aligning with the definition of a 'Message' in telecommunications.
section_title: HS-SICH
biotag_Context: O,O,O,O,O,O,O,B-Measurement,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Measurement,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Measurement,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Measurement,O,O,O,O,O,O,O,O,O
biotag_Description: O,B-Message,I-Message,O,O,O,O,O,O,O,O,O,O,B-Device,I-Device,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Connection,I-Connection,I-Connection,I-Connection,O