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Base station, terminal, and wireless communication system

A wireless communication system and terminal technology, applied in the fields of wireless communication systems, terminals, and base stations

Pending Publication Date: 2021-11-26
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In contention-type random access, although the probability is low, it may happen that multiple mobile stations transmit preambles at the same timing and using the same RACH resource

Method used

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  • Base station, terminal, and wireless communication system
  • Base station, terminal, and wireless communication system
  • Base station, terminal, and wireless communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0086] Regarding Embodiment 1, an embodiment in which an unlicensed frequency band (hereinafter referred to as an unlicensed frequency band) is used as a frequency band for transmitting signals from a terminal to a base station in a random access procedure will be described. Specifically, when the terminal sends the signal related to the random access process through the unlicensed frequency band, the terminal sends the signal through the resources of the unlicensed frequency band corresponding to the configuration information. In addition, an unlicensed frequency band refers to a frequency commonly used in a plurality of wireless communication systems, for example, refers to a frequency that can be commonly used with Wi-Fi and base stations of other suppliers. In addition, the resource mentioned here is a resource determined by the frequency axis and the time axis.

[0087] figure 1 The radio communication system 1 of Embodiment 1 is shown. The wireless communication system...

Embodiment approach 2

[0112] In Embodiment 1, an example of controlling to change the transmission timing of the random access procedure signal transmitted from the terminal 200 based on the information on the transmission timing has been described. In Embodiment 2, an example showing a transmission timing of a specific message in a random access procedure of a plurality of terminals will be described.

[0113] Figure 5 A wireless communication system 2 according to Embodiment 2 is shown. The wireless communication system 2 has a base station 100 and a plurality of terminals 200A-200F. The base station 100 forms a cell C10. A plurality of terminals 200A-200F exist in cell C10. In addition, the same code|symbol is attached|subjected to the same function as Embodiment 1. As shown in FIG. In addition, the plurality of terminals 200A- 200F have the same configuration as the terminal 200 in Embodiment 1, respectively. In addition, when 200A-200F is not distinguished especially, it abbreviates as t...

Embodiment approach 3

[0158] In Embodiment 1, an example of controlling to change the transmission timing of the random access procedure signal transmitted from the terminal 200 based on the information on the transmission timing has been described.

[0159] In addition, in Embodiment 2, an example showing the transmission timing of the message 3 in the random access procedure has been described. In Embodiment 3, an example in which the terminal 200 continuously transmits the message 3 is further shown. In addition, in Embodiment 3, the radio communication system, base stations, and terminals are the same as those in Embodiment 2, and thus description thereof will be omitted.

[0160] The signal transmitted from the terminal 200 using an unlicensed frequency band can indicate repeated transmission through a control signal (or a control channel (PDCCH, Physical Downlink Control CHannel: Physical Downlink Control Channel)) transmitted from the base station 100 .

[0161] Therefore, regarding message...

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PUM

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Abstract

A terminal (200) comprises: a reception unit (212) that receives a signal of a random access procedure from a base station (100); a control unit (220) that controls a transmission timing of transmitting the signal of the random access procedure; and a transmission unit (211) that transmits the signal of the random access procedure to the base station (100) in an unlicensed band at the transmission timing controlled by the control unit (220). The base station comprises: a transmission unit that transmits the signal of the random access procedure; and a reception unit (112) that receives the signal of the random access procedure. The control unit (220) controls the transmission timing of the signal of the random access procedure that is transmitted from the transmission unit (211) in accordance with configuration information (T) related to the transmission timing.

Description

technical field [0001] The invention relates to a base station, a terminal and a wireless communication system. Background technique [0002] In recent years, in wireless communication systems such as mobile phone systems, in order to further increase the speed and capacity of wireless communication, the next-generation wireless communication technology is being discussed. For example, in the communication standard of the 5th generation mobile communication (5G or NR (New Radio: New Radio)), in addition to the standard technology described in the communication standard of the 4th generation mobile communication (4G) (for example, non-patent literature 1- In addition to 11), technologies for achieving further higher data rates, larger capacities, and lower delays are also required. In addition, regarding the 5th generation communication standards, technical research is ongoing in 3GPP working groups (eg, TSG-RAN WG1, TSG-RAN WG2, etc.), and the first version of the standard ...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W16/14H04W72/04
CPCH04W16/14H04W74/0808H04W74/004H04W74/006H04W72/044H04W74/0833
Inventor 太田好明下村刚史
Owner FUJITSU LTD
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