KR19990038143A - How to maximize CDM's paging channel performance - Google Patents

Abstract

According to the present invention, in the paging channel, one of the forward channels of the CDMA, the overhead message is always transmitted to increase the reliability of the service of the base station, remove the delay occurring in the software through the processing of the overload condition, and remove the delays in 40 ms. The present invention relates to a method of maximizing paging channel performance of a CDM that can cope with an error occurring during a paging channel transmission by using a message ending of the TIA / EIA / IS-95 specification. Is achieved by sending four overhead messages within 1.28 seconds so that the terminal can always receive the overhead messages, and checks the overload status of the paging channel software and adjusts the number of sorts according to the overload status. Is achieved by the method.

Description

How to maximize CDM's paging channel performance

The present invention is the Digital Communication Service (DCS) and Personal Communicat (PCS)

ion service, particularly in a paging channel, which is one of the forward channels of a code division multiple access (CDMA), and always transmits an overhead message to the service of the base station. CDMA improves reliability, eliminates delays in software through handling of overload conditions, and copes with errors that occur during paging channel transmission by using 40ms of message encoding. The present invention relates to a method of maximizing paging channel performance.

In general, the terminal periodically monitors the paging channel after receiving the overhead message of the paging channel, and the terminal cannot receive the message only when the terminal transmits the message to a time point that matches the paging slot. .

When sending a message to a terminal through a paging channel, it is important to efficiently send a large amount of messages, it is desirable to implement to increase the efficiency by sending the maximum message to a predetermined paging slot.

When sending a message using a paging channel, the message that is ended must coincide with the point in time at which the terminal monitors the paging channel (paging slot).

This paging slot is repeated periodically according to the value provided by the system. In conventional software, the buffer size for storing messages is small, so that the number of messages that can be processed by the paging channel should be smaller than the message requests that the paging channel should end during actual system operation. I wrote it down.

As the processing of the message to the paging channel slot before the processing time of the software, the message is sorted into the paging slot of the next cycle.

However, if the number of previous paging slot messages is large, the message that is actually sent through the paging channel may be different from the paging slot of the terminal due to the software delay due to a certain number of sorts. do.

In addition, according to TIA / EIA / IS-95, an overhead message (the terminal receives this message and uses it for initialization of the terminal) that the base station should always send every 1.28 seconds appears in the first two to three paging slots.

Therefore, if there are many paging messages to be processed, this overhead message may not be emitted, and thus the terminal in initialization may not be properly initialized.

The present invention has been made to solve such a conventional problem, an object of the present invention is to increase the size of the buffer for the message to be processed to allow sufficient acceptance of the message, in the process of processing the paging message In order to eliminate the software delay that occurs, the degree of software overload at the time of processing is checked and the processing is changed according to this overload.

In addition, another object of the present invention is to designate four paging channel slots of the 16 slots as the overhead slot in order to prevent the overhead message from going out in case of an overload state by sending only the overhead message to the paging slot It is to facilitate the initialization of the terminal.

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 flow chart for determining whether to sort the message through the software overload check in the present invention

4 is a flowchart illustrating a case of 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 to a paging channel, FIG. 2 is a flowchart illustrating a message forming a paging slot, and FIG. 4 is a flowchart illustrating a sorting operation, and FIG. 4 illustrates a flowchart illustrating a paging slot for inserting an overhead message according to the present invention.

In the present invention, the size of a buffer sufficient to process the paging message coming from the BCP is as follows, and 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 point is overloaded, the previous slot message is discarded without performing a sort to reduce software overload.

In addition, even if there is no overload, the appropriate number of sorts is determined, and if more than this number, the software overload can be reduced by discarding without sorting.

In this case, the overload time is when the paging slot is pushed by the software delay when the sort is performed, and this case occurs when the sort is performed for more than 128 messages by experiment.

Thus, if you are using more than 128 messages for the entire buffer, you can overload the software by discarding the messages without performing a sort.

In case of not overloading, the number of sorts for the same paging slot message is determined as follows based on the maximum number of transmissions in one paging slot at 9600bps rate.

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 to make a message of one slot. First, if there is a message from outside, it is stored in a corresponding buffer (step S1), and a 20 msec processing signal is applied. After the paging message is established (step S2), it is determined whether it is the next slot (step S3). If it is the next slot, the message sequence is initialized (step S4). The head flag = FALSE is set (step S6), and if it is correct, the head flag = true (TRUE) is set (step S7).

FIG. 2 is an operation flow for creating a message constituting one paging slot. When creating a paging order, priority is given to a message to be sent to a paging slot monitored by the terminal.

That is, if a paging message is established (step S10), and if there is no message to be ended, it is determined whether there is a slot assign message, and an assignment is established (steps S11 and S12).

If there is no slot assign message in the above, it is determined whether there is a slot order message, and an order is established (steps S13 and S14).

If there is no slot order message in the above, 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 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 through software overload checking. In this case, a state in which an overload buffer is used is 128 or more.

First, after establishing a page, setting a message according to TIA / EIA / IS-95, and determining whether the slot is an overhead slot, if it is correct, perform step A as shown in FIG. 4, and if it is wrong, It is determined whether or not the same (steps S31-S36).

If the current slot is the same as the ending message (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 the above 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 is <26, or if it is put back in the correct position, and if it is correct, the next message is taken and it is determined whether there is a message and terminates when there is no message (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)

In a method for configuring one cycle of a paging channel, the CD message is characterized in that the overhead messages are equally distributed to the slots based on the minimum slot period of the paging channel. How to maximize paging channel performance in CDMA. 2. The method of claim 1, wherein the minimum slot period is 16 paging channel slots. 3. The method of claim 1, wherein four overhead messages are transmitted within 1.28 seconds according to TIA / EIA / IS-95.