Method for selection and determination of modulation coding modes, corresponding terminal device and base station device
A modulation and coding method and terminal equipment technology, applied in the direction of channel coding adjustment, transmission rate adjustment, transmission path separation device, etc., can solve problems such as reducing link reliability, increasing blind detection complexity, and large demodulation delay , to reduce complexity, avoid blind detection, and achieve simple results
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Embodiment 1
[0063] When selecting the modulation and coding scheme and the number of resource blocks, factors such as transmission power, data packet size, channel state information, multiple access resource information, and / or interference intensity information of each resource block need to be considered. The operation process proposed in this embodiment is as follows: figure 2 Shown:
[0064] In the first step, the terminal device determines the power control mode according to the configuration of the high-layer signaling from the base station device. Power control methods include the following three methods:
[0065] The first way is open-loop power control based on fully compensated path loss. In this way, the base station allocates the same power reference to the terminal through high-level signaling, and informs the terminal to compensate for all path losses, that is, sets the path loss compensation coefficient α=1. In this way, the calculation method of the transmit power of t...
Embodiment 2
[0099] image 3 Schematic diagram of the basic flow for obtaining interference strength information for a terminal, including:
[0100] Step 1: The base station performs interference measurement on the time-frequency resources used in the scheduling-free system. The interference described in this embodiment mainly comes from edge terminal devices of adjacent cells, such as Figure 4 Interference between terminal 4 and base station 1. It should be noted that in this embodiment, the two adjacent cells may be cells controlled by different base stations, or may be cells controlled by the same base station. In either case, the specific resource assignments are handled in the same way. Specifically, there are two measurement methods:
[0101] The first method: This method is suitable for reference signal and data transmission in the frequency band of the scheduling-free system, specifically as Figure 5 The case where there are reference signals and data in the subframe is show...
Embodiment 3
[0131] In the scheduling-free system, when the terminal has data to transmit, the modulation and coding scheme and the number of resource blocks are selected through the methods of Embodiment 1 and Embodiment 2. At this time, since the base station does not know the modulation and coding scheme used by the terminal and the number of resource blocks, the existing solution is to perform blind detection on the possible modulation and coding schemes used. However, in the new multiple access system, due to the superposition of massive user data, and the modulation and coding methods used by each user's data may be different, the complexity of blind detection is very high, and when different modulation and coding methods When the data are superimposed together, it will affect the performance of joint detection. Therefore, this embodiment introduces a modulation and coding method and a mapping method of resource blocks, so that data of different modulation and coding methods are orth...
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