KR100834671B1 - Data service method for mobile communication system - Google Patents

Abstract

According to the present invention, there is provided a method for providing a data service in a mobile communication system having a supplemental channel (SCH) and a supplemental code channel (SCCH), wherein the number of calls for which the data service is requested is a first reference value. And checking whether the number of the calls is greater than or equal to the second reference value, and when the number of the calls is greater than or equal to the first reference value and less than the second reference value, provides a service through the additional channel. Calls include providing an MDR service through the additional code channel.

1x System, Muiti_SCH, MDR, Throughput

Description

Data service method of mobile communication system {DATA SERVICE METHOD FOR MOBILE COMMUNICATION SYSTEM}             

1 illustrates the channel structure of a forward link of a 1x system (= 1.2888 Mcps) according to the present invention.

2 is a diagram illustrating a procedure for processing a service request from a terminal in a 1x system according to an embodiment of the present invention.

3 shows a graph for showing a simulation result to prove the effect of the present invention.

The present invention relates to a mobile communication system, and more particularly, to a method for increasing data throughput in a high speed packet transmission mobile communication system.

Typical mobile communication systems only support voice services. However, as technology advances along with user demands, mobile communication systems are developing in the form of supporting data services. For example, mobile communication systems such as High Data Rate (HDR) and 1xEVDO are systems for supporting only high-speed data services, and 1xEVDV is a system for supporting both high-speed data services and voice services.

In the case of the 1x system, the maximum data throughput is 144 kbps, but when providing data service for a plurality of calls, the data yield is lowered to 30 kbps or less according to the number of the plurality of calls.

In detail, the results of the experiment (environment: Samsung 1x System) showed that the maximum data yield was about 144kbps when providing data service for one call, but the data yield was about 46.7kbps when four calls were attempted. It also dropped to 24 kbps when 8 calls were attempted. This test result is obtained when the Black Box is not used. That is, when looking at the results of the above experiment, if the data service is provided for a plurality of calls, there is a problem that the data yield is lowered can cause user complaints. In other words, when providing a data service for a large number of calls (call) there is a problem that the user is not satisfied with the data yield.

Accordingly, an object of the present invention is to provide a method for providing a high speed data service even if a plurality of subscribers are provided with a data service in a mobile communication system supporting a high speed data service.

Another object of the present invention is to provide a method for providing a data service through a MDR (Medium Data Rate) for a predetermined number of calls in a 1x system.

In order to achieve the above objects, a method for providing data service in a mobile communication system having a supplemental channel (SCH) and a supplemental code channel (SCCH) is provided. Checking whether the first reference value is greater than or equal to the second reference value and the number of calls is greater than or equal to the first reference value and less than the second reference value. The remaining calls may include providing an MDR service through the additional code channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention supports 1x data service (Multi_SCH) and MDR (IS-95B) service in a base station system (BSS), and supports MDR service based on a predetermined criterion when a terminal requests data service. I will explain the solution. Here, since the RF scheduler (scheduler) uses the same algorithm as the conventional one, a detailed description thereof will be omitted. In the 1x system, when using the MDR service of the IS-95B according to the present invention, data throughput can be increased. This is demonstrated by the graph of FIG. 3 attached.

1 shows the channel structure of a forward link of a 1x system (= 1.2888 Mcps) according to the present invention. 1 is a structure disclosed in TIA / EIA / IS-2000.

As shown, the channel of the forward link includes Common Assignments Channels, Common Poer Control Channels, Pilot Channels, Common Control Channels. It consists of a Sync Channel, Traffic Channels, Broadcasting Channels, Paging Channels, and Quick Paging Channels. Here, the pilot channels are a forward pilot channel, a transmit diversity pilot channel, auxiliary pilot channels, auxiliary transmit diversity pilot channels, and auxiliary transmit diversity pilot channels. ). In addition, the traffic channels according to the present invention include a dedicated control channel, a fundamental channel, a power control subchannel, supplemental code channels, and additional channels. (Supplemental Channels).

In the above structure, it is assumed that the present invention uses 64 Walsh codes. 40 Walsh codes are allocated for the Multi_SCH service and 20 Walsh codes are allocated for the MDR service. That is, 40 Walsh codes are allocated to the additional channel and 20 Walsh codes are assigned to the additional code channel. Here, since five Walsh codes are used per MDR call, the number of calls to which the MDR service can be allocated is limited to five. The reason for doing this is to leave a few Walsh codes for the voice service. Meanwhile, when most of Walsh codes are used for the Multi_SCH and the MDR, when a request for a voice service is received, the Walsh code used in the MDR is first assigned to the voice service. Make the Walsh code available to the MDR service again.

Although the present invention has been described with an example of 64 Walsh codes that can be provided by the system, it is obvious that the present invention can be applied even if a different number of Walsh codes are used. In addition, in the following description, specific reference values (number of arcs) are numerical values determined through simulation based on 64 Walsh codes, and it is obvious in the art that the numbers vary when different numbers of Walsh codes are used. Thus, the present invention is not limited by specific reference values.

The procedure for providing a data service in a 1x system having a channel structure of a forward link as shown in FIG. 1 is as follows. 2 illustrates a procedure for processing a data service request from a terminal in a 1x system according to an embodiment of the present invention. The following procedure is performed in a base station system (BSS).

Referring to FIG. 2, first, an upper controller (not shown) checks whether a data service request is received in step 201. If a data service request is received, the controller proceeds to step 203, otherwise waits for a service request to be received. After receiving the data service request, the controller checks the number of calls to provide a service in step 203. Here, the number of calls includes a call requesting the service. In step 205, the controller checks whether the number of calls is less than 3 calls. If the number of calls is less than 3calls, the controller proceeds to step 213 to provide a packet data service using Multi_SCH for calls to be provided. That is, packet data service is provided through an additional channel for all calls.

On the other hand, if the number of calls to provide the service is 3calls or more, the controller proceeds to step 207 to check whether the number of calls is more than 4calls and less than 7calls. If the number of calls is greater than or equal to 4 calls and less than 7 calls, the controller proceeds to step 215 to provide data services using Multi_SCH for 3 calls among the services to be provided and to provide data services using MDR for the remaining calls. do. That is, 3call provides a service through an additional channel, and the remaining calls provide a service through an additional code channel.

On the other hand, if it is determined that the number of calls to provide the service is not less than 7 calls, the controller proceeds to step 209 to check whether the number of calls is 8 calls or more. If the call to provide the service is 8calls or more, the controller proceeds to step 211 to provide the data service using MDR for the 4calls, and provides the data service through the Multi_SCH for the remaining calls. That is, 4call provides a service through an additional code channel and the remaining calls provide a service through an additional channel.                     

That is, as described above, the present invention is characterized in that in a 1x system using 64 Walsh codes, the number of calls provides MDR service for 4 calls to 8 calls.

Looking at the simulation results according to the present invention.

<1 ~ 3Call Packet Data Service Request>

Support packet data service using Multi_SCH.

Result: Average Througput: Over 73kbps (when not using BlackBox)

<4 ~ 7Call Packet Data Service Request>

Scheme 1) 3Call supports packet data service using Multi_SCH, and provides MDR service to the remaining 4 terminals.

Result: Througput of terminal using Multi_SCH → 70kbps or more.

       Througput of terminal using MDR → 50kbps or more.

In this case, the MDR service is provided to four terminals, but a parameter is provided to be variably adjusted.

<Packet data service request over 8 Call>

Scheme 1): 4Call provides an MDR service, and provides a packet data service using Multi_SCH for the remaining UEs. When Walsh or RF power is additionally allocated for a voice call, a supplemental code channel (SCCH) in MDR service is assumed to be a voice call, and when the voice call ends, the SCCH is allocated to the MDR SCCH.                     

Result: Througput → 20kbps ~ 70kbps of “terminal = (7 + α) -4 using Multi_SCH”. (Α> 0).

     (7 + α = Packet Data Request Terminals, 4 = MDR Service Switching Terminals)

       Througput 4 terminals using MDR → 50kbps or more.

That is, if the area using the data service is about 8 Call or more, the demand for voice call is also very high, so the Multi_SCH is used for "(7 + α) -4" terminals. That is, do not allocate MDR more than 4 Calls. If MDR is allocated more than 5 calls and overlaps voice calls, even MDR service has poor data throughput. That is, when most of Walsh codes are used using Multi_SCH and MDR, when a voice service request is received, the Walsh codes used in the MDR are first assigned to the voice codes. To make it available.

3 is a graph showing a simulation result to prove the effect of the present invention.

In FIG. 3, reference numeral 301 indicates a change in data throughput according to the number of calls when only 1x data service is used, and reference numeral 302 indicates data according to the number of calls when only MDR service is used. Yield (Throughput) is shown, and reference numeral 303 denotes the change in data throughput according to the number of calls when using the algorithm according to the present invention.

As shown, when only 1x data service is used, the data throughput is significantly lowered from 3calls or more. In addition, when only the MDR service is used, the data throughput is always constant regardless of the number of calls. Meanwhile, when using the 1x data service and the MDR service according to the present invention, it can be seen that satisfactory data throughput appears even when supporting a plurality of services.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention has an advantage of improving data throughput that is lowered as the number of data service calls increases by providing an MDR service together in a 1x system.

Claims (4)

A method for providing a data service in a mobile communication system having an additional channel (SCH) and an additional code channel (SCCH), Checking whether the number of calls for the data service is greater than or equal to a first reference value and less than a second reference value; When the number of calls is greater than or equal to the first reference value and less than the second reference value, the number of calls that are one less than the first reference value provides a service through the additional channel, and the remaining calls are provided through the additional code channel. Data Rate (MDR) data service providing method comprising the process of providing a service. The method of claim 1, If the number of calls is greater than or equal to the second reference value, then providing a service through the additional channel for service request calls. The method of claim 1, If the mobile communication system uses 64 Walsh codes, the first reference value is four calls, and the second reference value is seven calls. The method of claim 3, A data service providing method of allocating five Walsh codes per call for the MDR service.

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