Method and device for selecting carrier frequency for mobile station
A mobile station, carrier frequency technology, applied in synchronization devices, network traffic/resource management, electrical components, etc., can solve the problems of access failure, unclear channel quality, inability to compare channel quality, etc., to maintain load balance, improve The effect of utilization
Active Publication Date: 2013-03-27
ZTE CORP
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Problems solved by technology
This mechanism can play a role in load sharing to a certain extent, but it also has defects, because at this time the BS does not know the channel quality of each carrier frequency relative to the MS. If the channel quality of the newly assigned carrier frequency is very poor for the MS, Then only lower-order modulation and coding methods can be used, which will lead to low utilization of radio resources and even lead to MS access failure
[0005] To sum up, the MS access method in the prior art is blind and does not consider the load balance of the carrier frequencies; and the BS cannot compare the channel quality of each carrier frequency with that of the MS, so the selection of the carrier frequency is also very difficult. Large blindness, unable to effectively use wireless resources
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[0029] Before setting forth the technical scheme of the present invention in detail, at first introduce several concepts that the present invention will relate to:
[0030] Logical BS: According to the IEEE 802.16e standard, each carrier frequency is an independent logical BS, and the BSs involved in the present invention all refer to logical BSs;
[0031] Adjacent cell BS: two carrier frequencies under the same cell coverage appear to be mutually adjacent cell BSs, that is, based on a logical BS, other logical BSs under the same cell coverage are all neighbors of the logical BS District BS.
[0032] The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0033] Before the MS selects a carrier frequency, the logical BS first needs to add a field indicating the load status of itself and the neighboring cell BS in its own neighbor broadcast message (MBO_NBR-ADV). In this embodiment, the field indi...
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The invention discloses a method for selecting carrier frequency for a mobile station. The method comprises the following steps that: the mobile station realizes synchronization with a logic base station, and acquires channel quality of the logic base station; the mobile station receives neighboring area broadcast message sent by the synchronous logic base station, and acquires the load conditions of the logic base station and a neighboring area base station from the received neighboring area broadcast message; the mobile station acquires channel quality of the neighboring area base station according to the information of the neighboring area base station in the neighboring area broadcast message; and the mobile station selects a proper logic base station as initial access according to the load condition and channel quality of each logic base station. The invention also discloses a device for selecting the carrier frequency for the mobile station. The method and the device can keep load balance between the carrier frequencies and improve the utilization rate of wireless resources.
Description
technical field [0001] The invention relates to a carrier frequency selection technology in a wireless communication system, in particular to a method and a device for a mobile station (MS, Mobile Station) to select a carrier frequency. Background technique [0002] In a wireless communication system, when the load of a certain cell is too heavy to meet the demand by using one carrier frequency, it is necessary to use multiple carrier frequencies to cover the cell to provide greater data throughput to meet the actual demand. In this case, it is necessary to consider the load sharing between different carrier frequencies, so as to balance the use of resources of each carrier frequency, and prevent the situation that some carrier frequencies are overloaded while other carrier frequencies are lightly loaded. [0003] For the Worldwide Interoperability for Microwave Access (WIMAX, Worldwide Interoperability for Microwave Access) communication system, the IEEE 802.16e standard st...
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IPC IPC(8): H04W28/08H04W48/20H04W56/00H04W72/02
Inventor 江华俊
Owner ZTE CORP