Wireless communication terminal device and wireless communication method

A technology of wireless communication terminal and control information, applied in wireless communication, multiplexing communication, location diversity and other directions, can solve the problem of high possibility of adaptive control utilization

Active Publication Date: 2018-04-10
SUN PATENT TRUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the utilization possibility of downlink adaptive control using SRS is also high.

Method used

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  • Wireless communication terminal device and wireless communication method
  • Wireless communication terminal device and wireless communication method
  • Wireless communication terminal device and wireless communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] [Structure of network system]

[0059] The network system of Embodiment 1 of the present invention is HetNet or HetNet CoMP, such as figure 1 As shown, it consists of a macro node 100 , a pico node 200 and a terminal (UE) 300 . In each macro cell, one macro node 100 and one or more pico nodes 200 are provided. Wherein, the pico node 200 may be a pico base station forming a separate pico cell, or may be a node such as RRH (Remote radio head, remote radio head) that communicates with a terminal as a part of a distributed transceiver antenna of a macro cell . The macro node 100 and each pico node 200 are connected by a low-latency, high-capacity interface such as an optical fiber. The macro node 100 and each pico node 200 in the cell share the transmission parameters of the SRS allocated to each terminal 300 existing in the cell, and receive the SRS to measure CSI. Each terminal 300 performs wireless communication with one or more nodes 100 and 200 selected by the macr...

Deformed example 1

[0097] In Embodiment 1, a case where closed-loop TPC of A-SRS is performed using DCI format 3 / 3A is described. However, according to the instruction of the macro node 100, the DCI format 3 / 3A may be used to perform closed-loop TPC only for a specific A-SRS. The specific A-SRS refers to any one of the five types of A-SRS that has parameter sets set separately according to the type of DCI and the value of the transmission request bit as described above.

[0098] Among DCIs including transmission request bits, DCI formats 0 / 4 are DCIs indicating uplink data allocation information, and DCI formats 1A / 2B / 2C are DCIs indicating downlink data allocation. In most cases, the traffic of packet data is bursty, so there is a high possibility that the allocation of PDSCH and PUSCH will be concentrated in time. In other words, there is a high possibility that DCI format 0 / 4 and PUSCH transmission or reception, or DCI format 1A / 2B / 2C, PDSCH, and PUCCH transmission or reception are performed...

Deformed example 2

[0101] It is possible to send DCI format 3 / 3A in all downlink subframes, but it can also be set to send TPCs containing A-SRS only in subframes or PRBs (Physical Resource Blocks) at specific times and time intervals Command DCI format 3 / 3A. As a result, terminal 300 does not need to attempt decoding of DCI format 3 / 3A in all subframes, so that the processing load can be reduced. Furthermore, the base station nodes 100 and 200 only need to transmit the DCI format 3 / 3A of the A-SRS in subframes at specific times or time intervals, and thus can reduce the overhead caused by the transmission of TPC commands.

[0102] In addition, in the case where the DCI format 3 / 3A of the TPC command including the A-SRS is transmitted or received only in subframes or PRBs at a specific time and time interval, the transmission opportunity of the TPC command of the DCI format 3 / 3A is reduced . However, the A-SRS for closed-loop TPC using DCI format 3 / 3A is likely to be an SRS intended to be rece...

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Abstract

Disclosed is a radio terminal capable of providing flexible transmission power control of SRS without being restricted by transmission power control of PUSCH in order to realize utilization of SRS for various purposes in a HetNet CoMP environment. The wireless terminal receives a control signal including a transmission power control command (TPC command) applicable to an aperiodic sounding reference signal (A-SRS) through the physical downlink control channel (PDCCH), and uses the TPC command to update the A-SRS transmit the power value, and transmit the A-SRS with the updated transmit power value according to the transmission request contained in the control signal notifying the allocation of the physical downlink data channel (PDSCH) or the allocation of the physical uplink data channel (PUSCH).

Description

technical field [0001] The present invention relates to a wireless communication terminal device, a wireless communication base station device, and a wireless communication method. Background technique [0002] In the uplink of LTE (Long Term Evolution, Long Term Evolution) and its improved LTE-A (LTE-Advanced, Advanced LTE) formulated in 3GPP (3rd Generation Partnership Project, Third Generation Partnership Project), adopt SC-FDMA (Single-Carrier Frequency-Division Multiple Access, Single-Carrier Frequency-Division Multiple Access) with small PAPR (Peak-to-Average Power Ratio, average peak power ratio) and high terminal power utilization efficiency (for example, refer to non-patent literature 1~4). In addition, in the uplink of LTE and LTE-A, scheduling to allocate time resources and frequency resources according to the channel environment of the terminal, and adaptive control to control the coding rate or modulation scheme are performed. In order to achieve high throughp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/32H04W28/16H04W52/08H04W52/32H04W52/54
CPCH04W52/54H04W52/325H04W88/02H04W52/146H04W52/16H04W52/46H04W16/32H04W52/08H04W52/32H04W72/23H04L5/0053H04J11/00H04L5/005H04W52/04H04W52/143H04W88/12H04B7/024H04L5/0048
Inventor 武田一树西尾昭彦
Owner SUN PATENT TRUST
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