Radio access network apparatus and method

A wireless access network and wireless access technology, applied in the field of mobile communications, can solve problems such as low user frequency utilization, unclear cell boundaries, and inability to fully suppress interference, so as to improve frequency utilization and suppress other cells interference effect

Inactive Publication Date: 2009-06-03
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the utilization rate of the frequency allocated to the user at the edge of the cell is not high
Depending on the situation, there may be a problem that interference cannot be sufficiently suppressed in a communication environment where the cell boundary is not clear and it is difficult to clearly determine in advance the frequency to be used at the cell edge

Method used

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  • Radio access network apparatus and method
  • Radio access network apparatus and method
  • Radio access network apparatus and method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] FIG. 2 shows a mobile station UE and a base station or Node B (NodeB) according to an embodiment of the present invention. The mobile station has a reception quality measurement unit 21 and a reception quality notification unit 22 . The reception quality measurement unit 21 measures the quality of a signal (for example, a downlink pilot channel) received from a base station. The quality can be represented by various quantities, and can also be represented by interference power, geometric shape and other appropriate certain channel state information channel quality indicator (CQI: Channel quality indicator). The reception quality notification unit 22 transmits the measured value to the base station.

[0040] The base station includes a grouping control unit 24 for each UE, a determination unit 25 for transmission power and the number of allocated resource blocks (number of RBs) for each group, a transmission power determination unit 26 for each RB, a frequency schedulin...

Embodiment 2

[0049] FIG. 5 shows a mobile station UE and a base station (Node B) according to an embodiment of the present invention. As in the example shown in FIG. 2 , the mobile station includes a reception quality measurement unit 21 and a reception quality notification unit 22 , and redundant descriptions are omitted. In addition, the base station includes a grouping control unit 24 for each UE, a transmission power determination unit 25' for each group, a frequency scheduling unit 27, and a transmission power correction unit 28, as in the example shown in FIG. 2 .

[0050] The grouping control unit 24 of each UE classifies the UEs into one or more groups based on the reception quality reported from each UE.

[0051] The transmission power determining unit 25' for each group determines the transmission power for each group based on the grouping discrimination result in the grouping control unit 24. Generally, UEs belonging to a group with high interference power require high transmis...

Embodiment 3

[0058] FIG. 7 shows a mobile station UE and a base station (Node B) according to an embodiment of the present invention. As in the example shown in FIG. 2 , the mobile station includes a reception quality measurement unit 21 and a reception quality notification unit 22 , and redundant descriptions are omitted. In this embodiment, unlike the first and second embodiments, assignment of radio resources and transmission power is performed by an upper layer station of a base station such as a radio network controller (RNC). The base station transmits the reception quality reported from the mobile station using the reception quality notification unit 23, the measurement value measured by the own cell, and the like to the upper station.

[0059] Incidentally, although allocation of radio resources and transmission power is done in the radio access network device (RAN) in all the embodiments, the main processing is performed by the base station in the first and second embodiments, whi...

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Abstract

A radio access network apparatus comprises a means for judging whether or not a mobile station belongs to the area of a cell end and a means for allocating the frequency of the cell end to the mobile station of the cell end and allocating the frequency of a non-cell end different from the frequency of the cell end to a user in an area other than the cell end. The frequency of the cell end includes a first band different for each cell. The frequency of the non-cell end includes a second band common to a plurality of cells including its own cell and a third band equal to the frequency of the adjacent cell end.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a wireless access network device and method. Background technique [0002] In a conventional time division multiple access (TDMA) mobile communication system, different frequencies are used between adjacent cells. A certain group of frequencies is used for multiple cell groups, and different geographically separated cell groups use the same group of frequencies. Such a method is good from the viewpoint of reducing interference from other cells, but it cannot be said that the frequency utilization efficiency is high. [0003] In contrast, in W-CDMA schemes such as IMT-2000, "single-cell frequency reuse" is realized by using the same frequency for all cells by distinguishing users with spreading codes. As a result, frequency utilization and system capacity are greatly increased. However, since the same frequency is used between adjacent cells, there is a con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/02H04B7/26
CPCH04W16/02H04W16/30H04W52/241H04W72/04H04W72/0453
Inventor 森本彰人川合裕之樋口健一佐和桥卫
Owner NTT DOCOMO INC
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