KR100308142B1 - Method of Dispersing the Load of Paging Channel in the Mobile Communication System - Google Patents

Abstract

The present invention relates to a load balancing method of a paging channel in a mobile communication system suitable for preventing overloading of a paging channel by using a paging auxiliary channel, wherein the terminal periodically wakes up one slot time earlier than its own slot and sleeps in the paging auxiliary channel. Determining whether there is information corresponding to the short message mode, the broadcast message mode, and switching to the normal page message mode, receiving the self message in the normal page message mode, and receiving the short message and broadcast type in the short message mode. Receiving a short message corresponding to the user through a text message dedicated channel; and receiving the short message corresponding to the user through a short message and a broadcast text message dedicated channel in the broadcast message mode. It characterized.

Description

Method of distributing the paging channel in mobile communication system {Method of Dispersing the Load of Paging Channel in the Mobile Communication System}

The present invention relates to a mobile communication system, and more particularly, to a load balancing method of a paging channel in a mobile communication system suitable for preventing overload of a paging channel using a paging auxiliary channel.

Hereinafter, a load balancing method of a paging channel using multiple paging channels in a conventional mobile communication system according to the prior art will be described with reference to the accompanying drawings.

1 is a diagram illustrating a paging channel slot configuration and a paging channel slot time to be monitored by a terminal in a load balancing method of a paging channel in a mobile communication system according to the prior art.

As shown in FIG. 1, Code Division Multiple Access (hereinafter referred to as CDMA) based on the IS-95 standard, which cannot separately have a Walsh code channel for a broadcast type short service, is referred to as CDMA. In the mobile communication system, multiple paging channels can be used.

When using a plurality of paging channels as described above, the base station broadcasts the number of paging channels to all terminals in the base station through a system parameter message (Overhead Information).

The terminal receiving this information determines the paging channel to be monitored by the terminal using the MIN of the corresponding terminal. The base station also delivers the slot and paging channel of the terminal using the MIN of the terminal when paging to the terminal.

In addition, the mobile communication system periodically wakes up at a unique slot time selected by the MIN periodically and decodes a page message or several additional messages provided by the system.

If the decoding results in a MIN corresponding to it, it takes its own and discards all messages if it does not. This process, which periodically performs this process, eventually requires battery consumption.

And, if there are several paging channels supported by the base station based on the information sent from the base station, the terminal determines the paging channel to be monitored by the terminal using the MIN unique to the terminal.

In addition, the UE determines the slot time of the slot time supported by the base station to determine the slot of the terminal using the MIN to search for the presence or absence of a message during the corresponding slot time every cycle.

The base station also transmits a paging message by selecting a slot and a paging channel of the terminal using the MIN of the terminal when paging to the terminal. Additional services are also delivered through this process.

That is, as shown in FIG. 1, a slot for paging channel information and a slot for broadcast type short transmission information, each of which has a period of N_paging paging channel slots (80 ms units), are displayed.

The slot for paging channel information is a slot for transmitting or broadcasting page message information and system information for each terminal (s) to which the corresponding paging channel slot is allocated, and the slot for broadcast type short transmission information has a period of general paging channel. Three slots of N_brdcast_sms paging channel slots than N_paging to specify the type and number of broadcast short transmission information included in the corresponding period of the information indexing slot, which is the first slot of each cycle, and subsequent slots. In the interval of three slots, the corresponding information is broadcasted in each slot.

In this state, each base station that receives a new type of information from the broadcast type short information service center every predetermined period searches for an unused paging channel slot to transmit the corresponding information. If there is an unused paging channel slot as a result of the search, the base station includes the information indexing slot in the first slot of the unused paging channel slot and broadcasts the corresponding information at the corresponding paging channel slot time.

In addition, when there is the paging channel information, the base station determines the paging channel slot number used by the terminal to receive the information and transmits the paging channel slot time.

In addition, when both the paging channel information and the information of the broadcast type short transmission information service are required to be transmitted at the same paging channel slot time, the base station gives priority to the information of the broadcast type short information service and provides After the information is transmitted first, the paging channel information is delayed by the corresponding period and transmitted in the corresponding paging channel slot time of the next period.

On the other hand, in the CDMA mobile communication system based on the IS-95 standard, a terminal monitors a paging channel only for one specified paging channel slot time of one specific paging channel allocated to itself in an idle state and receives information. Operate in mode.

In order to receive the broadcast short information service, the terminal first receives the information received at one paging channel slot time common to all terminals within the broadcast short information service cycle, and then requests the short message information. The desired information is obtained at the corresponding paging channel slot time by obtaining the paging channel slot number to which the information of P is transmitted.

While obtaining the broadcast type short transmission service information required by the above process, the original paging channel information is received and obtained at a paging channel slot time uniquely assigned to the original paging channel information period.

However, in the conventional mobile communication system as described above, there are the following problems in the load balancing method of a paging channel using multiple paging channels.

First, as the number of subscribers increases, the paging capacity is relatively increased. Therefore, as the number of subscribers requiring various information services increases by increasing up to seven paging channels, the base station must support various additional services accordingly.

Second, various additional services can be provided to the subscriber through the paging channel according to the request of various information. The short service or the broadcasting service causes the paging channel to significantly reduce the paging capacity of the paging channel.

Third, the terminal periodically wakes up for 80 ms and checks for the presence of a message. This process requires battery consumption.

The present invention has been made to solve the above problems by using a paging auxiliary channel (Hot Paging Channel) to prevent the overload of the paging channel and the terminal periodically wakes up from the dormant state to reduce the time to receive the information of the base station battery of the terminal It is an object of the present invention to provide a load balancing method of a paging channel in a mobile communication system to reduce consumption.

In the mobile communication system according to the present invention for achieving the above object, the load balancing method of the paging channel, the terminal periodically wakes up one slot time ahead of its own slot and the presence or absence of information corresponding to itself in the paging auxiliary channel Switching to the short message mode, the broadcast message mode, and the normal page message mode; receiving the self message in the normal page message mode; Receiving a short message corresponding to the, and in the broadcast message mode characterized in that it comprises the step of receiving a broadcast short message corresponding to itself through the short message and the broadcast type text message dedicated channel.

1 is a diagram illustrating a paging channel slot configuration and a paging channel slot time to be monitored by a terminal in a load balancing method of a paging channel in a mobile communication system according to the related art.

2 is a diagram illustrating a paging channel slot configuration and a paging channel slot time to be monitored by a terminal in a load balancing method of a paging channel in a mobile communication system according to the present invention.

Hereinafter, a load balancing method of a paging channel using a paging auxiliary channel in a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

Prior to describing the paging auxiliary channel, quick paging will be described.

Quick paging is a new paging technique that reduces the monitoring time of a terminal that periodically monitors a paging channel by knowing information coming to the paging channel in advance through a quick paging channel, which is an auxiliary channel of a paging channel.

In general, a CDMA system includes a forward channel and a reverse channel, and the forward channel includes one pilot channel, one sync channel, up to seven paging channels, and a plurality of traffic channels.

Here, the paging channel is a channel for providing information about the system to the terminal, for example, serves to inform that the call has been made to the terminal.

The terminal always monitors the paging channel of the base station. As a monitoring method, there are periodic methods and aperiodic methods. In the non-periodic method, since the terminal should continuously monitor the paging channel, it consumes more battery than the periodic method. There are many shortcomings, and they usually use a periodic method.

However, this periodic method also monitors periodically whether or not there is a message on the paging channel, so unnecessary power consumption occurs, and the technology emerged to solve such problems is quick paging, and quick paging is the next generation mobile communication (IMT-2000). This is a technology proposed in IS-95C, which is an early stage service.

2 is a diagram illustrating a paging channel slot configuration and a paging channel slot time to be monitored by a terminal in a load balancing method of a paging channel in a mobile communication system according to the present invention.

The configuration of the paging scheme using the paging auxiliary channel of the present invention can be broadly divided into a text message dedicated channel excluding a paging portion and a call (call) that complements the quick paging technique of the IS-95C.

First, the paging auxiliary channel scheme is a supplement to the existing quick paging scheme of the IS-95C. The conventional quick paging scheme is applied to the terminal for the slot time corresponding to the terminal when the terminal is operating in the idle mode. In the form of informing the presence or absence of the corresponding information in one bit, the paging auxiliary channel of the present invention allocates two bits to inform the status of the base station, that is, the update of system information, the presence or absence of a page message, and the presence of other problem messages. According to this form, it is classified into three modes.

And the length of the message related to the incoming / outgoing on the paging channel is sufficiently small compared to the length of the supplementary service message. Therefore, up to 60000 BHCA is enough, but additional services, such as short messages and broadcast messages, have their own lengths, which significantly reduces the paging capacity of the paging channel.

Such a short message or a broadcast message has a bursty characteristic, and thus the amount of the message is rapidly increased at a specific time. Therefore, a dedicated paging channel is independently allocated for messages with this characteristic and a long length, and the problem service is transmitted to the forward channel.

The present invention, as shown in Figure 2, first to have a dual operation mode for the terminal based on the existing IS-95A, J-STD 008 and the like.

First, in order to be compatible with existing systems, i.e., systems based on IS-95A, J-STD 008, etc., the base station selects 1 bit of the reserved field of the system parameter message of the paging channel. If it supports, set it to "1", otherwise set it to "0" to broadcast.

Subsequently, in the paging auxiliary channel operation mode, the existing paging channel is basically composed of at least one channel. When the paging auxiliary channel is operated, the paging auxiliary channel is composed of at least three channels.

The terminal should be implemented to support both of the above operation modes.

When the base station supports the paging auxiliary channel, the overall operation is performed through the following configuration. First, the channel is classified into three channels as follows.

First, the paging auxiliary channel is similar to the operation principle of the quick paging channel of the IS-95C, but sets two bits of paging information. The mode of the base station is divided into 2 bits. According to this mode, the base station informs the terminal of some information.

First, if the set 2 bits is "01", the base station has a message to be transmitted to the current terminal to the paging channel This mode is similar to the operation principle of the quick paging channel of the IS-95C.

Subsequently, if the set 2 bits are "10", the base station notifies the terminal that there is a short message. There is a separate text transmission message to inform the terminal that there will be a short message in the terminal on the channel.

If the set 2 bits are "11", the base station notifies that there is a broadcast message corresponding to the terminal during the broadcast message transmission period. The base station has a separate period to support broadcast or multicasting service to all terminals, and transmits the presence or absence of a message corresponding to the terminal.

The base station periodically transmits system information. In some cases, the information broadcasted by the base station is changed, and the base station forcibly updates the information of the base station currently stored by the terminal by forcibly setting the corresponding bit to "01" so that the terminal can see the base station information.

For example, every message has a configurator sequence, which is a message sequence, which is incremented when the content of the message is updated. Since this information is known to all terminals in the base station, all fields are set to " 01 " for broadcasting so that the terminal collects information of the system by forcibly looking at the corresponding slot and renews it.

On the other hand, in the characteristics of the paging auxiliary channel used in the present invention, the transmission speed of the paging auxiliary channel may operate at rate 1 (9600 bps), rate 1/2 (4800 bps), rate 1/4 (2400 bps) The transmission rate is defined in the paging channel and broadcasted. The following operation is the same as the quick paging technique of the IS-95C.

In addition, an additional service that significantly degrades the performance of a paging channel, that is, a text service channel, is separately used. If there is a text message, the mode of the paging auxiliary channel is set to 1X. If "10", there is a short message. If "11", the short message follows the normal paging cycle in order for the broadcast message and the short message to coexist. The cycle of the message is set to Cycle S * N (N> 2) which is larger than the cycle of the short message (Cycle S).

The overall operation, as in FIG. 2, generally indicates that the paging auxiliary channel has a page message. On the other hand, if there is a broadcast message, the collision can be avoided by making it larger than the normal page message transmission period.

First, referring to the conventional method of FIG. 1, a short message, a broadcast message, a page message, etc. are transmitted through one paging channel. If the terminal wakes up at its own slot time and has a message corresponding to itself in the corresponding slot time, In response, otherwise, the device will operate in the sleep mode until the next cycle.

Short messages also work in this fashion.

The broadcast message operates with a period sufficiently larger than the existing paging period. In general, all terminals wake up to this slot because they have a unique slot called a reference slot.

At this time, all the terminals wake up to determine whether there is a broadcast type short message corresponding to them, and if there is information corresponding to them, they receive the broadcast type message.

In the paging auxiliary channel structure, in order to prevent the bottleneck between the page message and the supplementary service serving the text service, the bottleneck is prevented by setting the dedicated page message channel and the dedicated supplementary service channel. In addition, by providing a paging auxiliary channel additionally proceeds in the form of notifying the terminal that the information.

The overall operation of FIG. 2 is as follows.

First, all terminals periodically wake up one slot time earlier than their own slots to determine whether there is information corresponding to a paging auxiliary channel.

Subsequently, when the two bits corresponding to the self are in the "01" mode, the current page message is found in its own slot and receives the own message in its own slot. In this case, since the paging auxiliary channel and the paging channel are different Walsh channels, the paging auxiliary channel and the paging channel are set to the Walsh channel switching time by allowing about 10 ms for the Walsh channel change time.

And if the two bits corresponding to the "10" mode, the base station indicates that there is a text message to the terminal receives a short message corresponding to itself through the short message and the broadcast-type text message dedicated channel.

At this time, since the paging auxiliary channel, the short message and the broadcast type text message dedicated channel are different Walsh channels, the Walsh channel switching time is set to about 10 ms required for the Walsh channel change time.

Subsequently, when two bits corresponding to the self mode are "11", the base station indicates that the terminal has a broadcast type text message, and thus receives the broadcast type short message corresponding to the user through the short message and the broadcast type text message dedicated channel. .

At this time, the paging auxiliary channel and the short message and broadcast text message dedicated channel are different Walsh channels, so the 10 ms required for the Walsh channel change time is set to the Walsh channel switching time. A longer enough period is used to avoid collisions between broadcast messages with short messages.

Therefore, the terminal receives the short message, the broadcast message, the page message, etc. through one paging channel, wakes up the received information in its own slot at regular intervals, and checks whether the corresponding information exists in the corresponding slot. In this case, the terminal responds to this and if there is no information, it operates in a sleep mode until the next period. In the case of a broadcast message, the terminal wakes up with a sufficiently large period. Since the terminal wakes up and operates only when there is information corresponding to the broadcast message and the short message in advance, it is possible to operate only when necessary, thereby reducing power consumption of the terminal.

As described above, in the method of load balancing the paging channel in the mobile communication system according to the present invention, the existing fast paging of the IS-95C is partially modified and a dedicated channel for text transmission is made to minimize the power consumption of the terminal and additional services of the base station. It can prevent the overloading of the paging channel due to delay, and can provide fast incoming / outgoing service by separating the text service channel and the page message channel.

In addition, the present invention is to reduce the power consumption of the terminal, to reduce the load of the base station paging channel, to expand the support of more efficient additional services, to speed up the incoming / outgoing response due to the quick response when the subscribers / outgoing, the separate character transmission channel As a result, it is possible to eliminate the speed of the text additional service and to eliminate bottlenecks between the page message and the additional service.

Claims (3)

The terminal periodically wakes up one slot time ahead of its own slot to determine whether there is information corresponding to itself in the paging auxiliary channel, and sets the short message mode, the broadcast message mode, and the normal page message mode; Receiving a self message in a unique slot in the normal page message mode; Receiving the short message corresponding to the user through the short message and the broadcast type text message dedicated channel in the short message mode; And in the broadcast message mode, receiving a broadcast short message corresponding to itself through a short message and a broadcast type text message dedicated channel. The method of claim 1, wherein the paging auxiliary channel indicates whether or not and the type of information corresponding to the terminal is 2 bits. The method of claim 1, wherein in the mode setting step, the time required for changing the channel is set to about 10 msec.