KR100363549B1 - Channel assignment method for mobile communications - Google Patents

Abstract

The present invention relates to a channel allocation method in a mobile communication system, and when a channel allocation request signal of a specific mobile station is received from an RNC, selecting a CHC having the least load among each CHC of a selected FA, and loading among each modem chip of the selected CHC. Selecting a modem chip having the lowest number, and assigning a channel of a specific mobile station to a channel element idle in the selected modem chip, and assigning a channel in consideration of FA, CHC, and modem chip loads when assigning a channel of the mobile station. The allocation ensures that the channel load remains even, preventing the degradation of the wireless environment and the degradation of call quality due to the channel load bias.

Description

CHCHANNEL ASSIGNMENT METHOD FOR MOBILE COMMUNICATIONS}

The present invention relates to a channel allocation method in a mobile communication system, and more particularly, to allocate a channel so that the load is maintained evenly in consideration of the frequency allocation (FA), the channel card (CHC), and the load for each modem chip in channel allocation of the mobile station. A channel allocation method of a mobile communication system.

As the development of the mobile communication system is advanced, various public and private mobile communication services such as vehicles, individuals, the public, data, and messaging using wireless access technologies such as cellular, cordless, and satellite are provided.

This is often categorized into generations: first generation is analog cellular, second generation is digital cellular, and third generation is Futuristic Public Land Mobile Telecommunication Systems (IMT-2000).

These mobile communication systems usually operate several FAs simultaneously. That is, a multi-FA environment in which n FAs are operated simultaneously from FA1 to FAn (where n is a natural number). Which FA each mobile station will use in a multiple FA environment is determined by a predetermined appointment.

A method of allocating channels to mobile stations in a base station is as follows.

When a base station allocates a channel to a mobile station, it allocates a channel by comprehensively utilizing the available FAs of the base station. In this case, if there is no traffic channel available for a particular FAi or if the traffic channel is used more than other FAs, the mobile station may allocate a traffic channel as FAn (n ≠ i).

Meanwhile, in a base station of a mobile communication system, a channel card unit (CHU) includes a plurality of CHCs, and one CHC usually includes eight modem chips, and channel elements are disposed in the modem chip.

In addition, the channel element allocation and management function in the CHC is performed by a base station main processor card (BMC) of a base station main processor unit (BMU).

In the case of channel allocation, a sequential method of assigning a channel to the next CHC is applied when the first CHC is saturated after first assigning to the first CHC. In the digital cellular system up to the second generation, since one channel element is disposed per modem chip, channel load does not occur even if the sequential channel allocation method is applied.

However, in the third generation mobile communication system, a plurality of channel elements are arranged per modem chip. In this case, if the sequential channel allocation scheme is applied as in the prior art, a bias of the channel load is induced for each CHC, and the wireless environment is deteriorated. There is a high risk of quality deterioration.

Therefore, in the third generation mobile communication system, the development of a new channel allocation method that can prevent the deterioration of the wireless environment and the deterioration of the call quality by properly distributing the channel load has emerged as an urgent requirement.

The present invention has been proposed to solve such a conventional problem, and provides a channel allocation method of a mobile communication system in which a channel is allocated so that the load is maintained evenly in consideration of the FA, CHC, and modem chip loads when the channel of the mobile station is allocated. Its purpose is to.

In the mobile communication system according to the present invention for realizing the above object, the channel allocation method comprises a plurality of RNSs connected to the core network; The RNS includes a plurality of Node Bs that manage one or more cells and an RNC that performs a connection / disconnection function upon handover between the Node Bs; The node B includes a plurality of CHCs incorporating a plurality of modem chips in which a plurality of channel elements are disposed, and a BMC for allocating and managing channel elements to the CHCs. 1. A method comprising: selecting a CHC having the least load among each CHC of a selected FA when a channel allocation request signal of a specific mobile station is received from the RNC; Selecting a modem chip having the least load among the modem chips of the selected CHC; Assigning a channel of the particular mobile station to a channel element that is idle in the selected modem chip.

1 is a schematic air interface of an IMT-2000 system;

FIG. 2 is a detailed block diagram of node B shown in FIG. 1;

3 is a flowchart for explaining a channel allocation method according to the present invention;

<Explanation of symbols for the main parts of the drawings>

1: core network 2: RNS

100: RNC 200: Node B

210: RFU 220: CHU

221: APC 222/1 to 222 / n: CHC

223: CPC 230: RIU

240: BSU 250: BMU

251: BMC

There may be a plurality of embodiments of the present invention, hereinafter with reference to the accompanying drawings will be described in detail a preferred embodiment. Through this embodiment, it is possible to better understand the objects, features and advantages of the present invention.

1 is a diagram illustrating a schematic air interface of an IMT-2000 system.

As shown therein, the IMT-2000 system is composed of several RNSs 2 connected to the core network 1 via the Iu interface.

The RNS 2 consists of an RNC 100 and one or more Node Bs 200, each Node B 200 managing one or more cells and connected to the RNC 100 via an Iub interface.

The RNC 100 performs a connection / separation function during handover between the Node Bs 200, and the RNC 100 also performs a connection / separation function in the case of an inter-cell handover within the same Node B 200.

The connection between the RNC 100 is made through Iur, where Iur and Iu are interfaces that logically connect each system.

FIG. 2 is a detailed block diagram of the node B shown in FIG. 1.

As shown in the drawing, the Node B includes an RFU (Radio Frequency Unit) 210, an APC (Analog Processing Card) 221, a plurality of CHCs (222/1 to 222 / n), and a CPC A Channel Card Unit (CHU) 220 consisting of a Channel Card Peripheral Processor Card (223), an RNC Interface Unit (RIU) 230 performing an interface with a Radio Network Controller (RNC) and a routing function in a Node B, and a Node B unit. Base station main processor unit with built-in BS Synchronization Unit (BSU) and Base Station Main Processor Card (BMC) 251 to generate system clocks and provide a reference clock for synchronizing the clocks used in each unit 250).

The APC 221 converts an analog signal into a digital signal when transmitting and converts a digital signal into an analog signal when receiving.

CHCs 222/1 to 222 / n include a plurality of modem chips (not shown), and a plurality of channel elements (not shown) are disposed on each modem chip.

The CPC 223 performs a function of controlling the CHCs 222/1 to 222 / n.

The BMC 251 performs a function of allocating and managing channel elements to the CHCs 222/1 to 222 / n through the CPC 223.

A process of allocating a channel to CHC according to the channel allocation request of the RNC in the Node B of the configured IMT-2000 system will be described with reference to the flowchart of FIG. 3.

First, a threshold value T1 for load distribution for each FA in the initialization state of the BMC 251 is set, and a difference threshold value T2 with respect to the total success rate average for the channel allocation success rate is set. Preferably, T1 is set to 80% and T2 is set to 10% (301 to 303).

Subsequently, when the RNC 100 outputs a channel allocation request signal specifying FA and sector for allocating a channel to a specific mobile station, the channel allocation request signal is transmitted to the BMC 251 of the Node B 200 through the Iub interface. 304.

Upon receiving the channel allocation request signal, the BMC 251 compares the designated FA load of the designated sector by the RNC 100 with a threshold value T1 for load distribution for each FA. If T1) is exceeded, FAs having the least FA load in the designated sector are selected (305 to 306).

Next, the CHC having the least load among each CHC (222/1 to 222 / n) of the FA designated in step 304 or the FA selected in step 306 is selected, and among the modem chips of the selected CHC, the modem chip having the least load is selected. In operation 307 to 309, the channel element in the idle state is selected in the finally selected modem chip.

Herein, in order to more stable channel allocation, the total channel allocation success rate average (A) and the allocation success rate (R) of the selected channel are calculated, and then the difference (A-R) between the two values is calculated (310).

Then, it is determined whether the difference value A-R between the total channel allocation success rate average A and the allocation success rate R of the selected channel is higher than the threshold value T2 set in step 303 (311).

If the difference value A-R calculated in step 310 is higher than the threshold value T2 set in step 303, it is determined that the channel allocation is successful, and information about the channel that has been successfully allocated is reported to the RNC 100. Otherwise, the blocking process is performed on the channel selected in step 309 and the corresponding information is reported to the RNC 100, and the subsequent steps are performed again from step 309.

As described above, the present invention allocates channels in consideration of FA, CHC, and modem chip loads when assigning channels of the mobile station, so that the channel loads are maintained uniformly, thereby preventing deterioration of the wireless environment and deterioration of call quality due to the channel load. do.

In addition, since the channel allocation success rate of each channel element is managed based on a specific threshold value for the average channel allocation success rate of all channel elements, the call quality is improved.

Claims (3)

Consists of several RNSs connected to the core network; The RNS includes a plurality of Node Bs that manage one or more cells and an RNC that performs a connection / disconnection function upon handover between the Node Bs; The node B includes a plurality of CHCs incorporating a plurality of modem chips in which a plurality of channel elements are disposed, and a BMC for allocating and managing channel elements to the CHCs. In the way: Selecting a CHC having the least load among each CHC of the selected FA when the channel allocation request signal of a specific mobile station is received from the RNC; Selecting a modem chip having the least load among the modem chips of the selected CHC; And allocating a channel of the specific mobile station to a channel element in an idle state in the selected modem chip. The method of claim 1, Setting a threshold value T1 for load distribution per FA; And comparing the threshold value T1 with the designated FA load of the designated sector by the channel allocation request signal of the RNC; And optionally performing the first step by selecting the FA having the least FA load in the designated sector according to the channel assignment request signal, according to the comparison result of the five step. The method of claim 1, Setting a difference threshold value T2 from a total success rate average for the channel allocation success rate; A seventh step of calculating a total channel allocation success rate average A and an allocation success rate R of the channel selected in step 3 and then calculating a difference A-R; Further comprising: comparing the threshold value T2 with the difference value A-R; And selectively performing the blocking process on the channel selected in the third step and performing the third step again according to the comparison result of the eighth step.