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Wireless communication system and base station

A wireless communication system and wireless signal technology, applied in wireless communication, electrical components, sustainable buildings, etc., can solve problems such as throughput reduction and communication disconnection, and achieve the goal of suppressing communication, reducing uplink interference, and stabilizing wireless communication. Effect

Inactive Publication Date: 2013-03-27
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large uplink interference power, the uplink communication of the terminal connected to the small base station brings adverse effects such as throughput reduction and communication disconnection.

Method used

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  • Wireless communication system and base station
  • Wireless communication system and base station
  • Wireless communication system and base station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] figure 1 An example of the system configuration of this embodiment is shown. As the base station device of the wireless communication system, there are a large base station (first base station) 1 with relatively high transmission power and a small base station (second base station) 2 with low transmission power. For example, a terminal 3-1 establishes a connection with the large base station 1, The terminal 3 - 2 establishes a connection with the small base station 2 and is in a state where data communication can be performed ( 4 - 1 , 4 - 2 ). The data communication 4 - 1 between the terminal 3 - 1 and the macro base station 1 becomes an interference signal 5 for the small base station 2 . In addition, in this embodiment, the larger the transmission power difference between the base station devices, the more obvious the problem to be solved in this embodiment. Therefore, the large base station 1 and the small base station 2 are distinguished by transmission power, but...

Embodiment 2

[0204] In the above-mentioned first embodiment, the method of multicasting the interference rule information from the small base station to nearby base stations was described, but in this embodiment, the method of multicasting to nearby base stations only when large interference occurs is described. .

[0205] exist Figure 5 In the flow chart of the small base station shown, in the interference rule extraction process performed in S1005, it is not estimated Figure 8A or Figure 8B The parameters shown in 404 to 407 are only used to judge whether interference with a large received power is detected during the interference measurement period, and if interference is detected, a multicast message is sent to nearby base stations. In addition, a multicast message may be communicated when a predetermined number of times of interference with a large reception power is detected within the interference measurement time. When the multicast message arrives, the nearby base stations k...

Embodiment 3

[0210] In the first embodiment, Figure 14 and Figure 16 Small base stations and large base stations are described separately, but each base station may also have Figure 14 and Figure 16 The function of both sides of the base station. That is, there may be a small base station that collectively has the function of a macro base station, and a macro base station that collectively has the function of a small base station. The purpose is that even if all base stations have the same downlink transmission power, as long as there are base stations that have both functions, the effects of this embodiment will be obtained. Those skilled in the art can easily design a base station having both functions. In addition, by adopting the same design for all base stations, development costs can be reduced, and as a result, cost reduction effects for base stations can be obtained.

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PUM

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Abstract

To reduce an uplink interference in a network with a first base station of a large output and a second base station of a small output. Detecting the interference, the second base station urges the first base station to hand over a terminal causing it to the second base station. Multiple base stations and one or more terminals exist in this system, each terminal connects with one base station, and a serving base station is changed according to a communication state of each terminal. If the different second base station other than the first base station to which the terminal connects detects a large interference, the second base station will multicast transmit information for urging handover to the base stations except itself. The base station having received the information specifies a terminal giving the interference to the second base station, and makes it to be handed over thereto.

Description

technical field [0001] The present invention relates to a wireless communication system and a base station, and in particular to a wireless communication system for facilitating handover processing of a mobile terminal of interference source in a heterogeneous network (Heterogeneous Network) in which a base station with a large output and a base station with a small output coexist. and base stations. Background technique [0002] As the background technology of this technical field, there is LTE (Long Term Evolution: long-term evolution), and the service launch has already ushered in some countries. [0003] In the cellular system in recent years, not only the large-scale and high-output macro base stations that have been the mainstream in the past, but also smaller and small-output pico base stations (pico base stations) and femto base stations (femto base stations) have also increased, filling the space of macro base stations. Coverage holes are placed in areas where dat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/08H04W88/08
CPCH04W36/08H04W36/20Y02B60/50
Inventor 藤岛坚三郎玉木刚片山伦太郎石田仁志
Owner HITACHI LTD
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