KR101066255B1 - Method and system for management radio resources of wireless communication network - Google Patents

Abstract

The present invention relates to a radio resource management method and system for a mobile communication network that efficiently manages the use of a traffic channel by delivering data that can be delivered to an SDB (Short Data Burst) through a signaling channel. Determining whether the data to be transmitted to the current packet control function (PCF) in the Packet Data Serving Node (PDSN) is data that can be transmitted to the Short Data Burst (SDB); And in the case of data that can be transferred to the SDB, indicating whether the SDB transferable data is present in a flag bit of a GRE header and transmitting the data to the PCF.

SDB, dormant, PDSN, radio resource, CDMA, EV-DO

Description

Wireless resource management method and system for mobile communication network {Method and system for management radio resources of wireless communication network}

1 is a system configuration diagram of a general CDMA 2000 network;

2 is a packet format diagram transmitted from a typical PDSN to a PCF;

3 is a format diagram of a conventional standard GRE header;

4 is a format diagram related to a GRE header for implementing the present invention;

5 is a flowchart illustrating a conventional user packet forwarding process;

6 is a flowchart illustrating a PPP echo request packet forwarding process using a conventional always-on;

7 is a flowchart illustrating a user packet forwarding process according to an embodiment of the present invention;

8 is a flowchart illustrating a PPP echo request packet forwarding process according to an embodiment of the present invention.

Description of the Related Art [0002]

10: MS 20: base station

30: BSC 31: PCF

40: PDSN

The present invention relates to a radio resource management technology of a CDMA 2000 1x or CDMA 2000 EV-DO network, and more particularly, by delivering data that can be delivered to a short data burst (SDB) to an always-on service subscriber through a signaling channel. The present invention relates to a radio resource management method and system for a mobile communication network that efficiently manages the use of traffic channels.

Before looking at the prior art, let's look at terms related to the related art.

CDMA 2000 1X: A further step in the IS-95A / B network previously used for data services. It provides data services at speeds of up to 153.6 kbps. This service enables not only voice calls but also WAP (Wireless Application Protocol). It will also improve quality of service and provide multimedia services, including audio / video on demand (AoD / VoD).

CDMA 2000 EV-DO (EVolution-Data Only): A network upgraded from the existing CDMA 2000 1X that transmits data such as VoD using a dedicated channel of up to 2.4Mbps without using a voice call network.

 PCF (Packet Control Function): Device for transmitting packets and managing call between BSC system and PDSN in CDMA 2000 1X / EV-DO network

PDSN (Packet Data Serving Node): A node located between PCF and gateway router in CDMA 2000 1X / EV-DO network, and receives packet from PCF and delivers it to Internet or external / internal network. Maintain same call information between PCFs

ALWAYS-ON: A service that transitions from a mobile terminal state to a dormant state (hereinafter referred to as 'idle') so as not to miss an assigned traffic channel.The mobile terminal transitions from an active state to an idle state or becomes active in an idle state. It is a service that can receive stable data service from the risk of signal loss, traffic channel allocation failure, call termination, etc. when transitioning to the terminal.It is periodically requested by PDSN to keep the mobile device active. Send the packet to the mobile terminal. It can be used as a value-added service of PDSN.

Base station controller (BSC): A device that manages a base station in a CDMA network. It plays a role in transmitting call processing signals in conjunction with MSC or PCF and delivering traffic between a mobile terminal and other nodes.

BTS (Base station Transceiver System): A comprehensive name of a base station system including antennas in a CDMA network. It is responsible for signaling and traffic transmission with BSC, air traffic resource management, and terminal location and status management.

Session Initiation Protocol (SIP): A protocol used to manage call sessions in VoIP mode.

Short Data Burst (SDB): When it is necessary to transfer short-term data between PDSN-PCFs, data is transmitted to the terminal using a signaling channel. Since the size of data transmitted through the signaling channel is limited, packets that can be delivered using the SDB are limited in length.                         

Point-to-Point Protocol (PPP): A protocol designed for use in point-to-point connections (RFC 1661/1662).

activation: The process by which a mobile station is assigned and activated a traffic channel to send data.

Hereinafter, the prior art will be described with reference to the drawings.

1 is a system configuration diagram of a general CDMA 2000 network.

Referring to FIG. 1, in general, in case of a CDMA 2000 1X Simple IP service, a user presses an access key only when a data service is desired in a mobile station (MS) 10, and terminates a call after use. In the case of the CDMA 2000 EV-DO, the mobile terminal accesses the PDSN 40 immediately after the mobile terminal is turned on, and maintains session information with the PDSN 40 until the power is turned off. Therefore, in the case of CDMA 2000 EV-DO, the dormant timer is driven to save air traffic resources and use it efficiently. If there is no data transmission between the mobile terminal and the PDSN during this timer value, the occupied traffic channel is released. By maintaining the dormant state, the traffic channel is returned for use by other terminals.

At this time, the terminal 10 and the PDSN 40 maintain session information, respectively, but the mobile terminal stays in a "dormant" state in which the mobile station does not occupy the traffic channel of the base station (BTS) 20. Only when there is a traffic channel, the channel is required to be allocated again and then transmitted. However, since the mobile terminal staying in the dormant state releases the traffic channel and maintains communication with the BTS 20 using only the signaling channel, when the terminal enters the shadowed area or enters the boundary area of the BTS 20, the traffic channel is returned again. It is also possible that the procedure for receiving an assignment will fail.

In addition, when the mobile terminal in the dormant state needs to transmit data and requests allocation of the traffic channel back to the BTS 20, the allocation may fail if there is no channel resource currently available.

The service introduced to prevent such call disconnection is an "always-on" service. Basically, the dormant timer expires by exchanging a PPP echo message between the PDSN and the mobile station before the dormant timer expires. This prevents the terminal from remaining active and always occupying a busy traffic channel.

For the above always-on service, one resource channel must be allocated to each subscriber during the service. Therefore, channel resource management cannot be performed efficiently. In this case, the subscriber can use the always-on service in order to guarantee the quality of the data service used by the subscriber.In general, the subscriber must always allocate the traffic channel to the always-on subscriber for the period of use. -on service for a fee.

However, if the ratio of always-on subscribers increases, the efficiency of the traffic channel cannot be prevented from being rigid. If there is no response to the PDSN's PPP echo request according to the terminal state, multiple retries are performed. In this situation, there is a possibility that the state management of the terminal may be incorrect. In addition, in the case of the general subscriber, not the always-on subscriber, the process of becoming active by receiving the traffic channel again in the dormant state is low, and there is a problem in that the delay time is increased.

And, in case of a packet such as a SIP signaling message having a small packet length, although the length of data to be sent is small and short-lived, the traffic channel must be allocated again, which causes a lot of overhead in this process. .

Accordingly, the present invention has been made to solve the above problems, and a radio resource management method and system for a mobile communication network that can send a small packet to a terminal in a dormant state by using a signaling channel in SDB format. The purpose is to provide.

Radio resource management method of a mobile communication network according to the present invention for achieving this purpose is to determine whether the data to be delivered to the packet control function (PCF) from the PDSN (Packet Data Serving Node) is data that can be delivered to the Short Data Burst (SDB) step; And in the case of data that can be transferred to the SDB, indicating whether the SDB transferable data is present in the flag bit of the GRE header and transmitting the data to the PCF.

In addition, another method for radio resource management of a mobile communication network according to the present invention for achieving the above object is a GRE (Generic Routing Encapsulation) header when transmitting data from the PDSN (Packet Data Serving Node) to the PCF (Packet Control Function) Indicating whether or not SDB transferable data is displayed in a flag bit and transmitting the same to the PCF; Determining, by the PCF, whether the terminal is in a dormant state (idle); And when the terminal is in the dormant state, transmitting the packet to the corresponding terminal through a signaling channel.

The wireless resource management system of the mobile communication network according to the present invention for achieving the above object, if the data to be transmitted to the terminal is data that can be delivered to the Short Data Burst (SDB), the flag bit of the GRE (Generic Routing Encapsulation) header A Packet Data Serving Node (PDSN) for displaying and transmitting to the next stage; And if the GRE header flag bit of the packet received from the PDSN is displayed, a packet control function (PCF) for transmitting the packet to the terminal through a signaling channel when the final destination terminal of the packet is in the dormant state.

In addition, the terminal for radio resource management of the mobile communication network according to the present invention for achieving the above object, when the terminal receives the SDB data through a signaling channel from the PCF (Packet Control Function), the data received through the general traffic channel and If there is a message to be processed and responded in the same way, it is characterized in that it is transmitted as a message of the SDB type through the signaling channel.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.                     

Since the configuration of the present invention is the same as the conventional one, the description thereof will be omitted.

However, it should be noted that the PCF 31 shown to be provided inside the BSC 30 may be built in the BSC 30 or configured separately.

First of all, the conventional problem is that a packet causing unnecessary traffic channel occupancy in a CDMA 2000 EV-DO network has a small length such as a PPP echo request or a SIP signaling message with an always-on function. It has a feature of datagram (UDP) rather than (TCP).

In the case of the PPP echo request, the purpose is to continuously check the status of the mobile terminal in the system. However, since the packet length is short and does not include special information other than keep alive, it is difficult to see meaningful traffic from the system.

 When the PPP echo request or the SIP signaling message is delivered to the PCF, the packet type cannot be determined by the PCF since the GRE encapsulation is transmitted as shown in FIG. 2 like the other packets. Therefore, it is difficult for PCF to deliver these messages to the mobile terminal using SDB.

This is because the IP header of the packet, which can determine the type of packet, is located inside the GRE header that can be decoded in the PCF, and thus the decoding is impossible in the PCF.

In the present invention, before such messages are delivered to the PCF, a special mark is placed on the GRE header visible to the PCF so that the corresponding packets can be delivered to the mobile terminal through the signaling channel.                     

That is, a short data burst (SDB) is sent to a mobile terminal currently in a dormant state by using a signaling channel in an SDB format.

Hereinafter, the structure of the GRE header according to the prior art and the present invention will be described with reference to FIGS. 3 and 4.

3 is a format diagram of a conventional standard GRE header, and FIG. 4 is a format diagram of a GRE header for implementing the present invention.

As shown in FIG. 3, the flag field of the conventional GRE header is reserved and not used for a specific purpose. In the present invention, the PCF utilizes the last bit of the flag bit as shown in FIG. It is possible to indicate whether or not to send SDB.

Here, the last bit of the flag field, which informs the transmission of the SDB, is called an 'SDB indicator'.

Therefore, when a PDSN sends a single message such as a PPP echo request or a SIP signaling message to the PCF, the PDSN marks (marks 1) the SDB indicator among the flag bits of the GRE header, and the PCF receives the packet to determine the state of the current mobile terminal. After determining whether it is a dormant, the packet length is examined to determine whether it can be sent using a signaling channel.

If the state of the mobile terminal is active, since the terminal already occupies the traffic channel, there is no need to deliver the packet using the signaling channel, and it can be delivered directly through the traffic channel.                     

Next, the length of the packet needs to be examined. This means that the size of the packet that can be delivered to the mobile terminal through the signaling channel is limited to about 64 bytes. Therefore, the size of the packet must be checked for successful delivery.

If the packet size is larger than the maximum size that can be delivered to the SDB, the BSC should activate the mobile station to occupy the traffic channel as usual, and then forward the packet.

Subsequently, the PCF sends the SRE out of the GRE packets received from the PDSN to the UE using the signaling channel without going through the process of allocating the traffic channel even when the state of the UE is dormant.

When the PDSN receives a packet that needs to be delivered to a mobile terminal on an interface connected to the Internet, the PDSN determines whether the packet is from a specific server (for example, an external SIP server, etc.) and is within the range of a specific data size. Determine by looking at the length field.

This is to determine whether or not to exceed the maximum packet size that can be transmitted to the terminal using the signaling channel as described above. If the packet is included in this data size range, this packet can be delivered to the mobile terminal, which is a dormant, by using the SDB. Therefore, the PDSN indicates the SDB in the GRE header to the PCF.

In anticipation of the future evolution of the network, the packet size that can be delivered to the SDB may be larger, so the PDSN adds the packet size compared to the SDB as a changeable configuration parameter and configures it to be changeable.                     

When the PCF receives the GRE packet indicated by the SDB from the PDSN, the PCF finally determines whether the mobile terminal is in the dormant state, and determines whether the packet can be delivered through the SDB in the dormant state. If the packet can be delivered through the SDB, the packet is delivered through the SDB without making the terminal active. The PCF shall consult the flag of the GRE indicated by the PDSN to determine the packet to forward to the SDB.

 If the packet size is out of the range that can be delivered to the SDB, the PCF goes through the procedure of activating and allocating a traffic channel as usual for the dormant mobile terminal.

  Checking the packet size that the PDSN checked first before the PCF finally transmits is to prepare for data inconsistency between nodes such as configuration change during system operation.

Hereinafter, an embodiment of the present invention will be directly compared with reference to the accompanying drawings.

5 is a flowchart illustrating a conventional user packet forwarding process.

First, when the PDSN receives a packet from an Internet Service Provider (ISP) (S11), it is compared whether the received packet is larger than the currently set Maximum Transmission Unit (MTU) (S12).

If the packet is larger than the MTU, the PDSN performs a fragment (packet split) to adjust the size of the packet frame (S13).

If the packet is not larger than the MTU, or after fragment execution, the packet is added to the PPP header (S14), and the GRE encapsulation is performed to add the GRE header to deliver to the PCF of the BSC (S15).

When a packet is received by the PCF (S16), the PCF checks the state of the mobile terminal MS currently receiving this packet (S17). If it is determined that the mobile terminal is in the dormant (idle) state, the terminal is activated (S18) and then a packet is transmitted to the mobile terminal (S19). The packet is transmitted (S19).

Meanwhile, a process of transmitting a PPP echo request packet to a mobile terminal according to whether to subscribe to an always-on service will be described with reference to FIG. 6.

When the PSN idle timer expires (S21), the PDSN determines whether the subscriber station is registered with the always-on service in order to determine the occupancy / return of the traffic channel (S22).

If it is determined in S22 that the subscriber station is not registered in the always-on service, when the mobile station needs to transmit a packet by transitioning to the idle state, it is activated to receive a session reset and traffic channel assignment.

If it is determined in S22 that the subscriber station is registered in the always-on service, the PDSN transmits the PPP echo request message to the PCF (S23), and performs GRE encapsulation (S24) and receives the GRE packet from the PCF (S25). .

When a packet is received by the PCF (S25), the PCF checks the state of the mobile terminal MS currently receiving the packet (S26). If it is determined that the mobile terminal is in the dormant (idle) state, the terminal is activated (S27) and then a packet is transmitted to the mobile terminal (S28). The packet is transmitted (S28).

Referring to FIG. 5, the flow of a user packet forwarding process according to an embodiment of the present invention will be described with reference to FIG. 5.

First, when the PDSN receives a packet from an Internet Service Provider (ISP) (S111), it is compared whether the received packet is larger than the currently set Maximum Transmission Unit (MTU) (S112).

If the packet is larger than the MTU, the PDSN performs a fragment (packet splitting) for adjusting the size of the packet frame (S113).

If the packet is not larger than the MTU or after the fragment is performed, the packet is added with the PPP header (S114), and the GRE encapsulation is performed to add the GRE header to deliver to the PCF of the BSC (S115).

At this time, while performing GRE encapsulation, it is compared whether the packet is a SIP signaling packet or a size that can be delivered to the SDB (S121). If it is determined that the packet is a SIP signaling packet and can be delivered to the SDB, an SDB indicator is displayed among flag bits of the GRE header. (Denoted 1) (S122).

When the GRE header is displayed, the final GRE packet is transmitted to the PCF (S131).

When a packet is received by the PCF (S131), the PCF checks the state of the mobile terminal MS currently receiving the packet (S141). If it is determined that the mobile terminal is in the dormant (idle) state, it is compared once whether a packet to be transmitted currently may be transmitted to the signaling channel in order to check for an error (S151).

If it is determined in step S151 that the packet cannot be delivered to the signaling channel, the terminal is activated (S161) and then transmitted to the mobile terminal (S162). If it is determined in S151 that the packet can be delivered to the signaling channel, The packet is transmitted to the mobile terminal (S162).

Referring to FIG. 6, a flow related to a PPP echo request packet forwarding process according to an embodiment of the present invention will be described with reference to FIG. 8.

When the PSN idle timer expires (S221), the PDSN determines whether the subscriber station is registered with the always-on service in order to determine the occupancy / return of the traffic channel (S212).

If it is determined in S212 that the subscriber station is not registered in the always-on service, when the mobile station needs to transmit a packet by transitioning to the idle state, it is activated to receive a session reset and traffic channel assignment.

If it is determined in S212 that the subscriber station is registered in the always-on service, the PDSN transmits the PPP echo request message to the PCF (S213), and performs GRE encapsulation (S221) and receives the GRE packet from the PCF (S222). .

When a packet is received by the PCF (S222), the PCF checks the state of the mobile terminal MS currently receiving the packet (S231). If it is determined that the mobile terminal is in the dormant (idle) state, it is compared once whether the packet to be transmitted currently may be transmitted to the signaling channel in order to check for an error (S232).

If it is determined in S232 that the packet can be delivered to the signaling channel, the packet is transmitted to the mobile terminal through the signaling channel (S233).

If it is determined in S232 that the packet cannot be delivered to the signaling channel, the terminal is activated (S241) and then the packet is transmitted to the mobile terminal (S242).

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that the present invention may be modified without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

As described above, according to the present invention, existing radio resources are distributed evenly by preventing radio resources from being consumed by non-critical one-time traffic generation due to the existing always-on service, and making them available only for actually useful user traffic. Improve the quality of your data service.

In addition, it can manage the always-on subscribers at low cost while avoiding the risks of processing delays and traffic channel allocation failures that occur during activation.

Claims (14)

In the radio resource management method of a mobile communication network, Determining whether data to be transmitted from a packet data serving node (PDSN) to a packet control function (PCF) is data that can be transferred to a short data burst (SDB) based on a packet length and a previously created transmittable data list; And If the data can be delivered to the SDB, radio resource management method of a mobile communication network comprising the step of indicating whether the SDB transferable data in the flag bit of the Generic Routing Encapsulation (GRE) header to the PCF. delete In the radio resource management method of a mobile communication network, Whether the data to be transmitted from the Packet Data Serving Node (PDSN) to the Packet Control Function (PCF) is the data that can be delivered to the Short Data Burst (SDB) is determined by the packet length and the previously created transmittable data list, and the result is transmitted to the SDB. If possible data, indicating whether or not the SDB transferable data is displayed in a flag bit of a Generic Routing Encapsulation (GRE) header and transmitting the data to the PCF; Determining, by the PCF, whether the terminal is in a dormant state (idle); And If the terminal is in the dormant state, transmitting a packet to the terminal through a signaling channel. 4. The method of claim 3, wherein the last bit of the flag bits of the GRE header is utilized. The terminal of claim 3, wherein the terminal is not in a dormant state. And activating (activating) the terminal to deliver a packet through a traffic channel. 4. The radio resource of claim 3, wherein when the terminal is in the dormant state, the PCF transmits data to the terminal after checking whether a packet can be delivered to the SDB by viewing flag bits of a GRE header. How to manage. 4. The method of claim 3, wherein when the terminal is in the dormant state, the PCF determines whether the data can be delivered to the SDB based on the packet length and the previously created transmittable data list. 4. The method of claim 3, wherein the data transmitted from the PDSN to the PCF is a PPP echo request message. 4. The method of claim 3, wherein the data transmitted from the PDSN to the PCF is a Session Initiation Protocol (SIP) signaling packet. Whether the data to be delivered to the terminal is data that can be delivered to the Short Data Burst (SDB) is determined based on the packet length and the previously created transmittable data list. A Packet Data Serving Node (PDSN) for indicating whether or not SDB transferable data is transmitted in a flag bit of the apparatus and transmitting to the next stage; And If the GRE header flag bit of the packet received from the PDSN is indicated, the radio resource of the mobile communication network including a packet control function (PCF) for transmitting the packet to the terminal through a signaling channel when the terminal terminal of the packet is in the dormant state. Management system. The method of claim 10, wherein the PDSN is A radio resource management system of a mobile communication network, characterized by using a variable that can change a packet size setting parameter that can be delivered to an SDB. The method of claim 10, wherein the PCF is Wireless resource management system of a mobile communication network, characterized in that built in the base station transceiver system (BSC). delete delete

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