Radio communication system, base station and mobile station

A communication system and mobile station technology, applied in the field of wireless communication systems, can solve the problems of increased total overhead and decreased uplink throughput, and achieve the effects of preventing the increase of total overhead, improving utilization efficiency, and high-precision scheduling

Inactive Publication Date: 2010-12-08
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overhead caused by sending feedback information from the mobile station to the base station may lead to a decrease in uplink throughput
[0007] In particular, in order to perform high-precision scheduling for the purpose of improving downlink throughput, it is desirable to obtain more feedback information with higher accuracy; but once the amount of feedback information is increased, the uplink control information from the mobile station to the base station It may lead to an increase in the total overhead and a decrease in the throughput of the uplink

Method used

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  • Radio communication system, base station and mobile station
  • Radio communication system, base station and mobile station
  • Radio communication system, base station and mobile station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] use Figure 12 A first example of the above-mentioned embodiment will be described. In the first embodiment, feedback information is described by taking subband CQI and wideband CQI as examples. If the subband CQI is better than the wideband CQI to a certain extent, the base station 101 makes the mobile station 102 periodically feed back the subband CQI; otherwise, it does not make the mobile station 102 periodically feed back the subband CQI.

[0069] Figure 12 This is a flowchart showing an example of a procedure for determining whether the CQI periodically fed back by the mobile station should be set as the wideband CQI or the subband CQI in the base station 101 based on the difference between the subband CQI and the wideband CQI. exist Figure 12 , the base station 101 obtains the subband CQI and the wideband CQI from the mobile station (1210). The base station 101 compares the obtained subband CQI and wideband CQI (1220). If the advantage of the subband CQI c...

Embodiment 2

[0072] use Figure 13 A second example of this embodiment will be described. In the second embodiment, when the difference between multiple sub-band CQIs reaches a certain level, the base station 101 makes the mobile station 102 periodically feed back the sub-band CQI; otherwise, the base station 101 instructs the mobile station 102 to stop The subband CQI is fed back periodically.

[0073] Figure 13 It is a flowchart showing an example of a procedure for determining whether the CQI periodically fed back by the mobile station 102 should be set as a wideband CQI or a subband CQI in the base station 101 based on differences between a plurality of subband CQIs. exist Figure 13 , the base station acquires a plurality of subband CQIs from the mobile station respectively (1310). The base station calculates the difference between the acquired multiple subband CQIs (1320). If the advantage of a subband CQI compared with other subband CQIs is greater than or equal to a preset co...

Embodiment 3

[0076] use Figure 14 A third example of this embodiment will be described. In the third embodiment, when the base station 101 does not cause the mobile station 102 to periodically feed back the subband CQI, it causes the mobile station 102 to aperiodically feed back the subband CQI.

[0077] Figure 14 It is a flowchart showing an example of a procedure for determining subband CQI acquisition from a mobile station using an aperiodic feedback method when the base station 101 does not periodically feed back the subband CQI. exist Figure 14 Among them, the base station 101 first determines whether to obtain the subband CQI in a periodic feedback manner (1410). This determination can be performed by, for example, the method described in the first embodiment or the second embodiment. Then, the base station 101 judges whether it has decided to obtain the subband CQI in the periodic feedback method (1420). If it has been determined not to acquire the subband CQI using the peri...

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Abstract

In a radio-communication system, when wanting to perform high-accuracy scheduling in a base station, a large number of information items, such as channel quality information, desired precoding matrix information and so on, are fed back from a mobile station with a high degree of accuracy. The base station monitors the feedback information and, upon acquisition of it, transmits to the mobile station a certain kind of feedback information which is judged to contribute to scheduling accuracy improvement while preventing the other kinds of feedback information from being sent to the mobile station.

Description

technical field [0001] The present invention relates to a wireless communication system, a base station and a mobile station related to the implementation of cellular communication. Background technique [0002] Scheduling performed in cellular communication is used to select time slots, frequency slots, modulation schemes, coding rates, etc. used in communication with mobile stations. If scheduling is performed by the base station, the base station performs scheduling using information such as the quality of wireless transmission lines of each mobile station. For example, when scheduling data transmission in the downlink from the base station to the mobile station, the radio transmission line quality of the downlink used for scheduling may be measured by the mobile station, for example, and then fed back to the base station. In this way, the base station performs scheduling based on the feedback information acquired from the mobile station. [0003] The standardization o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/16H04W28/04
CPCH04B7/0645H04W8/245H04L5/0007H04W24/00H04W88/08H04L5/0091H04L1/0029H04W72/1226H04L1/0027H04W72/54
Inventor 片山伦太郎玉木谕山本知史石井裕丈
Owner HITACHI LTD
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