KR100237285B1 - Variable transmitting rate in pcs system - Google Patents

Abstract

With the introduction of PCS technology to the existing CDMA system using only 8 kbps, the transmission rate of the service has been extended to 13 kbps. Therefore, the system needs to define a method for setting up calls with the two baud rates.

That is, in the case where the exchange option is designated by the switching center, the subscriber service differentiation process is used, which ignores the service option requested by the terminal and uses only the service option specified by the switching center; If the switching center does not specify the service option, the base station uses its algorithm to determine the service option with the terminal in consideration of the system resource situation. A call and a call of 13 kbps are set to be mixed.

Description

A method of mixing a call of 8 kbps and a call of 13 kbps in a PCS system.

The present invention relates to a method of mixing a call of 8 kbps and a call of 13 kbps in a personal communication service (PCS) system. In particular, in a voice service serving as a basic service, a call of 8 kbps and 13 kbps is used. To a method for mixed use of arcs.

The PCS and Code Division Multiple Access (hereinafter referred to as CDMA) system includes a large number of base stations, a base station manager system (BSM) that operates and manages multiple base stations, and an exchange system ( Mobile Switching Center (MSC) and location registration system.

The area served by each base station is called a cell, and the cell can be divided into several sectors. The cells are sequentially expanded to the base station area and the service area of the switching center.

In a mobile communication system, systems below the exchange system are commonly referred to as Base Station Subsystem (BSS). The base station sub-system consists of a base station management system (BSM) and a base station system in order.

Existing CDMA system used 8kbps transmission rate for voice service. Since only one speed is used, there is no need to consider the transmission speed in the system, and there is no part in the system that sets up a call with a different transmission speed.

However, with the introduction of the PCS technology, the transmission speed of the service has been extended to 13kbps, and accordingly, a communication system has required a need for a mixed operation for the two transmission speeds. Accordingly, a system for establishing 8kbps and 13kbps calls in the system is required. There is a need to define the method.

Therefore, the present invention to solve the above problems,

Based on the IS-634 protocol based on the IS-634 protocol, the base station and the switching center are based on the settings of the transmission speed of 8kbps and 13kbps for the same voice service. Its purpose is to provide a way to handle this in connected systems.

The present invention is to achieve the above object,

If the exchange specifies service options for each subscriber, it shall be processed according to the subscriber service differentiation process; If the exchange does not specify service options, the base station itself consists of a system capacity and call quality maximization process that determine the type of call service based on the system's resource status.

All user information subscribed to the communication system is managed through the HLR (Home Location Register) system.

The HLR system provides all subscriber information of the wireless communication system: electronic serial number, directory number, international mobile station identification, user profiles and flow location. Used to manage mobile subscribers by preserving (current location), etc.

The HLR system can be deployed together with or independently of an exchange that manages the exchange of mobile terminal stations in a wireless communication system, to serve several exchanges.

In the subscriber service differentiation process according to the present invention, the subscriber's information is recorded in the HLR system to distinguish the service by the transmission rate for each subscriber. In other words, the decision of the service option is made by the switching office for each subscriber.

The base station provides a service to the mobile terminal using only the service determined and determined by the switching center. The base station rejects all calls other than the method specified by the switching center through negotiation with the mobile terminal, so that the mobile station can service the mobile terminal only in a manner designated by the switching center.

If the mobile terminal does not accept the service specified by the system, the system handles and releases the corresponding call.

The process of maximizing the capacity and call quality of the system according to the present invention is used when the exchange does not specify the service. At this time, the base station determines the service with the terminal according to its own processing algorithm.

The choice of one of the two baud rates of 8kbps and 13kbps in the system is closely related to the capacity aspect of the system. That is, a 13kbps transmission rate consumes more system capacity than a 8kbps transmission rate because more bits are sent within a given time.

Therefore, the service using the transmission speed of 13kbps, the call quality is better than the 8kbps, but the capacity is reduced.

Therefore, the system designates the maximum allowable number of 13kbps service calls, and if the number of calls currently being serviced at 13kbps from the base station is less than the maximum threshold, the system continuously permits 13kbps calls that require a channel, otherwise it allows 13kbps calls. It negotiates with the terminal so that the call is set to 8kbps without doing so.

Referring to the operation of the present invention in detail as follows.

When the mobile terminal establishes a call, it transmits terminal information and initial service selection for the terminal to the base station system. The terminal delivers call information such as desired speed and type to the base station through the service selection.

The base station system transmits the terminal information and the service selection information received from the terminal to the switching center. The switching center then uses the terminal information received from the base station system and the service selection to determine the service of the terminal that sent the signal.

At this time, if the call setup method of the calling terminal is determined as a subscriber differentiation process, the exchange transmits the service selection for the transmission rate to the base station system through an assignment request message.

Alternatively, if it is determined as a service by maximizing the capacity of the system and the call quality, the switching center accepts transmission speeds of 8kbps and 13kbps at the same time without distinguishing the subscriber, and thus does not deliver the service selection field to the base station.

In the subscriber service differentiation process, since the exchange station designates the service option, the base station compares the service option requested at the time of transmission from the terminal and the service option specified by the exchange station.

If the two base stations compare the same value, the base station sets the granted mode to 2 and delivers it to the terminal. Then, the base station and the terminal establishes a call with the service option requested by the terminal without negotiation.

If the service option requested by the terminal is different from the service option specified by the exchange, the base station sets the value of the grant mode to 1 and delivers it to the terminal. Then, the base station negotiates with the service option initially requested by the terminal.

The permission mode is defined in the ANSI-J-STD-008 protocol. If the permission mode is 0, a service option negotiation with a terminal is performed in service option 1; 1, the terminal is negotiated with the service selection used in the initial origination / incoming; In case of 2, the call is set up with the service option requested by the terminal without the negotiation procedure of the service option between the base station and the terminal.

If the service option specified by the switching center differs from the service option requested by the terminal, the base station negotiates the service option with the terminal using the grant mode 1.

If the terminal does not accept the desired service option, the base station system handles an error for the call.

In the process of maximizing the system capacity and call quality, since the service option field is not transmitted from the switching center to the base station, the base station can freely determine the terminal and service option.

If the call setup method of the calling terminal is selected as the system capacity and call quality maximization process, since the switching center does not deliver the service selection, the base station sets the terminal and the service selection according to its own algorithm.

At this time, since the 13kbps call improves the quality of the call but decreases the system capacity, the maximum settable 13kbps call is combined with the total power factor of the system to determine whether to accept the 13kbps call.

The base station examines the state of the base station when the service option requested by the terminal is 13 kbps. That is, when the number of 13 kbps calls of the current system is less than the maximum number of lakes allowed by the base station, and the base station output power is less than the maximum total power allowed by the base station, the current base station system can afford to accept a new call.

Therefore, the base station sets the permission mode to 2, thereby accepting the service selection required by the terminal without negotiating the service selection.

However, if the number of 13 kbps calls is the maximum number allowed by the base station, or if the base station output power is greater than the base station maximum power, the permission mode is set to 1 to change to 8 kbps through the service selection negotiation with the terminal in the base station.

At this time, when the terminal does not accept the service option presented by the system, the exchange station accepts and processes the service option presented by the terminal, not the service option specified by the terminal.

Therefore, in the present invention, a mixed processing method for the newly added 13kbps rate service in the PCS system is shown in terms of system resource management, capacity management, and subscriber management.

In the present invention, by defining an effective negotiation procedure with the terminal in a system capable of processing all 8kbps / 13kbps call as described above, it is intended to operate the system efficiently.

That is, the present invention provides a method for allowing a switching center to use a service option designated for each subscriber by a subscriber differentiation process; The present invention provides a method for setting service selection with a terminal according to an algorithm in a base station by itself in a base station by maximizing a system capacity and call quality.

Whether to specify the service option, which is the initial field of the allocation request message used in the IS-634 protocol, is used as a factor in determining the service option in the base station system.

Accordingly, in all PCS systems that comply with the ANSI-J-STD-008 protocol used between the terminal and the base station, and the IS-634 protocol protocol used between the base station and the switching center, the base station or exchange determines the criteria for defining service options with the terminal. Can control each other in the country.

The present invention allows the service to be set only with the designated service option when the switching center first sets the service option; If the exchange does not make a decision on the service option, the base station can freely determine the terminal and the service option, thereby defining a method for call setup in a system using both 8kbps and 13kbps calls in the system, It is possible to mix calls of two transmission speeds.

Claims (9)

If the exchange preferentially designates a service option, processing according to the subscriber service differentiation process; A method of mixing a call with a transmission rate of 8 kbps and a call of 13 kbps in a PCS system, which is handled according to the process of maximizing the capacity of the system and the call quality if the exchange does not decide on the service option. The method of claim 1, wherein in the subscriber service differentiation process, In the PCS system, the base station and the terminal, using only the service options specified by the exchange, the call is a mixed method of the call of 8kbps and the call of 13kbps. The method according to claim 2, When the service option requested by the terminal and the service option specified by the switching center are the same, a call with a transmission rate of 8 kbps in the PCS system, characterized by using the service option requested by the terminal without negotiation procedure between the base station and the terminal. A method of mixing arcs of 13 kbps. The method according to claim 2, If the service option requested by the terminal and the service option specified by the switching center are different, a call rate of 8 kbps in the PCS system is characterized by using the service option specified by the switching center through negotiation with the base station and the terminal. And 13kbps. The method according to claim 4, If the terminal does not accept the service option specified by the switching center, the base station fails to handle the call, characterized in that the call rate of 8kbps and 13kbps call in the PCS system. The method according to claim 1, wherein in the process of maximizing capacity and call quality of the system, A method of mixing a call of 8 kbps and a call of 13 kbps in a PCS system, characterized in that the base station itself determines service options. The method according to claim 6, When the terminal requests a 13kbps call, in consideration of the maximum allowable 13kbps number of the current base station system and the maximum allowable power, the system may allow the terminal to accept the service option requested by the terminal without negotiation if there is a sufficient amount of system resources. A method of mixing a call of 8 kbps and a call of 13 kbps in a PCS system. The method according to claim 7, When a 13kbps call is requested by the terminal, when there is no room in the base station system resource, the method of mixing a call with a transmission rate of 8kbps and a call of 13kbps in a PCS system, characterized in that for changing to 8kbps mode through negotiation with the terminal. The method according to claim 8, In the PCS system, a call rate of 8kbps and a call of 13kbps are characterized in that the switching center accepts the service option presented by the terminal when the terminal does not accept the mode changed by the base station.