Mobile communication system, method, mobile terminals and base stations

Abstract

In a mobile communication system for carrying out packet transmission / reception between a mobile terminal (13) having a power saving mode to reduce a power consumption and a radio base station (14), a packet type of a packet is judged, and a sleep timer value indicating a time duration since a last packet is transmitted / received until the power saving mode starts is set according to a judgement result. Then, at least one sleep timer (32a, 32b) for measuring an elapsed time since the packet is transmitted / received is activated, and the mobile terminal is controlled to execute the power saving mode at a timing at which the elapsed time measured by the at least one sleep timer exceeded the sleep timer value.

Description

technical field [0001] The invention relates to an energy-saving method in a mobile communication system, in particular to a technology for converting an energy-saving mode on a mobile terminal in radio data packet communication. Background technique [0002] Generally, a mobile communication system such as PHS or HIPERLAN Type 2 (High Performance Radio Local Area Network) has a power saving mode function to reduce consumption of a battery of a mobile terminal. [0003] For example, a cellular system such as PHS is a circuit switching type communication system in which the end of the communication process is clear, so after the end of the communication, the mobile terminal switches to the power saving mode to intermittently receive data from the radio base station. signal of. There is only a period of intermittent reception in this power saving mode, which is called a super-frame period (see ARIB RCD STD-28 Standard Specification for Second Generation Cordless Telephone Sys...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional technology, during the power saving mode, the mobile terminal intermittently receives signals from radio base stations or APs and restores the communication state when receiving the signals, because the signal from the radio base station (AP) is not restored until the communication state is restored. , so there is a delay at most as large as during intermittent reception in case of transition to communication state

For this reason, when the switching of the power saving mode is performed during real-time communication, a paging delay occurs and packet reception cannot be performed normally, so there is a possibility of performance degradation due to packet loss

[0006] In particular, in the above-mentioned cellular system, only one intermittent reception period is established during the power saving mode, so the intermittent reception period must be reduced according to real-time communication when there are both real-time and non-real-time packets, but the paging delay The reduction requires a corresponding reduction in the intermittent reception period, so there is a problem that a sufficient effect cannot be obtained from the viewpoint of energy saving

[0007] On the other hand, in the above-mentioned HIPERLAN type 2, there are a plurality of intermittent reception periods during the energy-saving mode, but the value selected at a certain point in the process of transitioning to the energy-saving mode is continuously used as the intermittent reception period of the mobile terminal, It is therefore impossible to cope with changes in the communication state and there is a problem that a sufficient energy saving effect cannot be achieved

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