KR100269864B1 - Method for maximizing the paging channel in cdma system - Google Patents

Abstract

PURPOSE: A method for maximizing a paging channel function of a CDMA(Code Division Multiple Access) is provided to transmit an overhead message, and to remove a delay generated in a software through an overhead state process. Therefore, a reliability relating to a BCP(Base Control Processor) is enhanced, and errors generated in a paging channel transmitting process are prevented. CONSTITUTION: A system distributes slots of paging channels into constant times, and loads an overhead message on a constant slot among the distributed slots, then transmits the constant slot. The system decides whether a present slot among transmitted paging channel signals is a next slot(S3). If so, the system initializes a message order regardless of the number of remaining messages(S4). The system decides whether the present slot is the slot loading the overhead message(S5). If so, the system loads the overhead message on the present slot and transmits the present slot.

Description

How to Maximize Paging Channel Performance for CDM

The present invention relates to a method of maximizing paging channel performance of CDA, and in particular, by transmitting an overhead message in a predetermined number of slots of a periodically broadcast CDMA paging channel, the terminal processes the input message without difficulty. The present invention relates to a method of maximizing paging channel performance of CDA, which can increase the reliability of a service of a base station and of course eliminate a paging channel transmission error due to an overload since the terminal encodes and processes an appropriate number of messages. .

Generally, the terminal encodes a paging channel periodically after receiving an overhead message of a paging channel broadcast from a base station at a predetermined time. At this time, the encoding time or interval corresponds to a paging slot. Only when the message is sent to the point in time can the terminal receive the message.

Therefore, when transmitting a message to the terminal through the paging channel, it is important to efficiently send a large number of messages, it should be implemented to increase the efficiency by sending the maximum message to a predetermined paging slot. In addition, when a message is sent using the paging channel, the message to be encoded should coincide with the timing (paging slot) at which the terminal monitors the paging channel.

However, the conventional mobile communication terminal as described above has a smaller size of a buffer for storing messages, so that the number of messages that can be processed is less than a request for a message to encode a paging channel received from a base station during actual system operation. In addition, when a message for a paging channel slot before encoding is not properly processed, the message is sorted into a message of a paging slot of a next cycle.

However, in the conventional method of processing a message of the mobile communication terminal, when the number of previous paging slot messages is large, it cannot be processed and sorted into the next slot. Therefore, the message transmitted through the paging channel from the base station is different from the paging slot of the terminal. There was a problem that the terminal does not properly receive the communication signal of the base station.

In addition, according to TIA / EIA / IS-95, an overhead message (a terminal receives this message and is used for initialization of a terminal) that the base station should send every 1.28 seconds is focused on the first two or three paging slots. In this case, if the base station has a large number of paging messages to be processed, the overhead message may not be emitted, and thus, the terminal in initialization may not be properly initialized.

Accordingly, the present invention has been made to solve the above-mentioned problems, and by sending an overhead message to a predetermined number of slots in a periodically broadcast CDMA paging channel, the terminal handles the input message without difficulty. It is an object of the present invention to provide a method of maximizing paging channel performance of a CD that can increase the reliability of the service of the base station.

Another object of the present invention is to provide a method of maximizing paging channel performance of a CD that can eliminate a paging channel transmission error due to overload, since the terminal encodes and processes an appropriate number of messages.

Another object of the present invention is to divide the message into 40msec in consideration of the transmission error of the message sent in one slot, and send six by 9600bps, three by 4800bps. 1 indicates that there is a message in the next slot, and when a message of the same paging slot is sent more than 1 slot, the slot with the mower pager 1 is fixed to 1 to ensure the processing of messages in other slots.

1 is a flowchart illustrating an entire process of ending a message to a paging channel.

2 is an operation flowchart for creating a message constituting a paging slot;

3 is an operation flowchart for determining whether a message is sorted through software overload checking in the present invention.

4 is a flowchart illustrating a paging slot for inserting an overhead message according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating an entire process of ending a message sent to a paging channel, FIG. 2 is a flowchart illustrating a message forming a paging slot, and FIG. 3 is a message through an overload check of software in the present invention. 4 is an operation flowchart for determining whether to sort, and FIG. 4 illustrates an operation flowchart when a paging slot to which an overhead message is to be put according to the present invention.

In the terminal of the present invention, the size of a buffer sufficient for processing a paging message from a base station (BCP) is as follows. The size of the buffer depends on the rate of the paging channel.

Buffer size = (maximum number of messages that can be sent in one paging slot + 1) X

(Maximum number of paging slots-number of slots to send overhead) + 10 In case of 9600bps, the maximum number of messages that can be sent in one paging slot is 12, and in case of 4800 bps, the maximum number of messages that can be sent in one paging slot is six.

The maximum number of paging slots is divided into 32 paging channel slots with a slot cycle index of one.

If the processing time point is an overload state, the previous slot message is discarded without performing a sort to remove the processing delay due to the message overload.

Even when there is no overload, an appropriate number of sorts is determined, and if more than this number, a proper number of message processing is executed by discarding without sorting.

In this case, the overload time refers to a state in which a range of the number of messages that can be processed in a predetermined slot is exceeded when the sort is performed. In this case, when the sort is performed on more than 128 messages, the experiment has been found.

Therefore, when more than 128 messages are processed for the entire buffer, the terminal of the present invention reduces overload due to message processing by discarding the messages without performing the sorting.

In addition, the number of sorts for the same paging slot message is determined as follows based on the maximum number of paging slots that can be sent in one paging slot at a rate of 9600 bps.

Maximum number of sorts in one paging slot = (1 paging slot maximum number of paging messages + 1) × 2

This value is the maximum performance obtained by experiment.

The base station should send four overhead messages every 1.28 seconds, where the overhead message is a message with information of the base station and information that the terminal should operate.

The terminal receiving the overhead message enters an idle state and periodically monitors the paging slot of the paging channel.

According to TIA / EIA / IS-95, a base station should transmit at least one overhead message in 1.28 seconds. According to the paging channel software, because overhead messages have lower priority than other message processing, the overhead message may not be processed when an overload occurs on the paging channel. It can satisfy the requirements of TIA / EIA / IS-95.

In order to send one overhead message per one paging slot, and to avoid overlapping four overhead messages in 16 paging slots, make an array of 16 × 16 as shown in Table 1 below. By allowing the head message to always go out, the terminal can always receive the overhead message.

Table 1

1,0,0,0,2,0,0,0,3,0,0,0,4,0,0,0

0,1,0,0,0,2,0,0,0,3,0,0,0,4,0,0

0,0,1,0,0,0,2,0,0,0,3,0,0,0,4,0

0,0,0,1,0,0,0,2,0,0,0,3,0,0,0,4

4,0,0,0,1,0,0,0,2,0,0,0,3,0,0,0

0,4,0,0,0,1,0,0,0,2,0,0,0,3,0,0

0,0,4,0,0,0,1,0,0,0,2,0,0,0,3,0

0,0,0,4,0,0,0,1,0,0,0,2,0,0,0,3

3,0,0,0,4,0,0,0,1,0,0,0,2,0,0,0

0,3,0,0,0,4,0,0,0,1,0,0,0,2,0,0

0,0,3,0,0,0,4,0,0,0,1,0,0,0,2,0

0,0,0,3,0,0,0,4,0,0,0,1,0,0,0,2

2,0,0,0,3,0,0,0,4,0,0,0,1,0,0,0

0,2,0,0,0,3,0,0,0,4,0,0,0,1,0,0

0,0,2,0,0,0,3,0,0,0,4,0,0,0,1,0

0,0,0,2,0,0,0,3,0,0,0,4,0,0,0,1

Here, 1 is a system parameter message, 2 is an access parameter message, 3 is a neighbor list message, 4 is a CDMA channel list message, and 0 is a message other than an overhead message.

In addition, the paging message corresponding to the paging slot for sending the overhead message can be received by the terminal by performing a sort to the corresponding paging slot of the next cycle.

In this case, the number of sorts is (number of paging messages sent at maximum at 9600 bps rate + 1) x 2 to obtain the maximum performance improvement.

For example, the paging channel performance of pre-modification software is 405000 messages / hour at 9600bps when the slot cycle index is 1, and 202500 messages / hour at 4800bps.

1 shows a process of checking whether a corresponding paging slot is a slot for sending an overhead message in order to make a message of one slot. Save to the buffer. After the received message storing step S1, the process proceeds to the paging message constructing step S2 and establishes and transmits a paging message in which a slot of a message to be transmitted is processed at 20 msec. After the paging message constructing step S2, the process proceeds to the next slot determining step S3 to determine whether the slot currently being processed is the next slot.

On the other hand, if it is determined during the next slot determination step (S3) that the current slot is the next slot proceeds to the initialization execution step (S4) to initialize the message order. However, as a result of the determination in the next slot determination step (S3), if the currently processed slot is not the next slot, the process returns to the previous step (S2) and repeats the loop.

In addition, after the initialization execution step (S3), the process proceeds to the overhead message slot determination step (S5) to determine whether the current slot is a slot to carry the overhead message. If it is determined during the overhead message slot determination step (S5) that the current slot is not a slot to carry the overhead message, the process proceeds to the overhead flag fall step (S6) and the current slot to the overhead flag fall (FALSE). Set it. However, if it is determined during the overhead message slot determination step (S5) that the current slot is a slot to which the overhead message should be carried out, proceed to the flag setting step (S7) to replace the current slot with an overhead flag = true (TRUE). Set it.

FIG. 2 is an operation flow for creating a message constituting one paging slot, and prioritizes a message to be sent to a paging slot monitored by a terminal when creating a paging order.

That is, the terminal establishes a paging message by establishing a paging message in an initial state (S10). If there is no message to be encoded after the paging message establishing step (S10), the process proceeds to the slot assign message determining step (S11) to determine whether there is an assign message. As a result of the determination in the assigning message determining step S11, if there is an assigning message, the process proceeds to the message establishing step S12 to establish the assigning message.

However, if there is no slot assign message in the above, it is determined whether there is a slot order message to establish an order (steps S13 and S14).

If there is no slot order message, if it is determined whether there is a slot burst message, a burst is established (steps S15 and S16).

If there is no slot burst message, it is determined whether there is a slot page message, and if a page is established (steps S17 and S18).

If there is no slot page message, it is determined whether there is an assign message, and an assign is established (steps S19 and S20).

If there is no assignment message in the above, it is determined whether there is an order message, and an order is established (steps S21 and S22).

If there is no order message in the above, it is determined whether there is a burst message, and if a burst is established (steps S23 and S24).

If there is no burst message, it is determined whether there is a page message, and if a page is established (steps S25 and S26).

If there is no page message in the above, it is determined whether there is a repeat page message, and a repeat is established (steps S27 and S28).

If there is no repeat page message, if it is determined whether there is an insert overhead flag, if no overhead is established, the process returns to the assignable message determination step (steps S29 and S30).

3 is a flowchart illustrating a method of determining whether a message is sorted by checking an overload of a message. In this case, a state in which an overload buffer is 128 or more is regarded as an overload state of software.

First, after establishing a page and setting a message according to TIA / EIA / IS-95, it is determined whether the slot is to be loaded with an overhead message. Perform step A. However, if it is determined during the slot determination step, it is determined whether the current slot is the same as the current slot while there is a message in the buffer if the current slot is not a slot to carry the overhead (steps S31 to S36).

If it is the same as the current slot, an encoding message is generated (step S37). If it is different from the current slot, the ONCE sort count is set to 0 (step S38).

Next, it is determined whether the message should be sent before, or it is determined whether it is larger than the current slot, and when it is large, it is sorted to the next paging slot (S39-S41).

However, if the above message is to be sent before, determine whether there are more than 128 buffers in use, increase the Wans sort count when not, and determine if there are more than 26 messages sorted in the next cycle, and then clear the message when it is abnormal. After importing the message, it is determined whether there is a message, but if there is an encoding message, the process returns to step S39 (steps S42 to S48).

FIG. 4 relates to the operation following step A of FIG. 3 and sets the count to 0 when it is determined whether there is a message (steps S51 and S52).

Next, it is determined whether or not it is the same as the current slot. If it is different, it is terminated.

If it is determined that the count <26, or if it is put back in the correct position, if the next message is taken after it is determined whether there is a message is terminated when there is no message (steps S55-S58).

As described above, according to the present invention, by sending an overhead message according to a predetermined overhead slot, it is possible to prevent the terminal in the initialization process from remaining in the initialization state because it does not receive the overhead message of the paging channel.

In addition, when a paging channel is used, when a message comes in at 40 msec, a paging slot is pushed. However, in the present invention, the slot may be processed even when the message is entered in 10 msec without being pushed.

In addition, compared with the performance of the conventional paging channel, the performance is improved by four times or more, and thus, there is an effect that it can be sufficiently operated without increasing the number of paging channels.

Claims (3)

A method of configuring a paging channel of a periodically broadcast mobile communication system, comprising: dividing a slot of a paging channel into a predetermined time and establishing a paging message of transmitting the overhead message only to a predetermined slot among the divided slots; The next slot determination system that determines whether the slot currently being processed is the next slot among the paging channel signals transmitted after the paging message establishment step, and the number of messages remaining when the slot currently processed is the next slot as judged during this next slot determination step. An initialization execution step of initializing the message sequence without a message; and determining whether the current slot is a slot to carry an overhead message after the initialization execution step, and if the slot is to be loaded with an overhead message, carrying an overhead message in the current slot. Characterized in that it comprises an overhead message processing step How to maximize the paging channel performance of CDA (CDMA). 2. The method of claim 1, wherein the paging channel slots are comprised of 16 slots. 2. The method of claim 1, wherein the overhead messages are transmitted in four 1.28 seconds according to TIA / EIA / IS-95.

Images