KR20010000160A - The method of distributing timebase offsets between the beacon signals and between advertizement packets of adjacent cells, supporting the dynamic resource reservation for the guaranteed mobile computing service utilizing those timebase offsets - Google Patents

Abstract

PURPOSE: A method for distributing timebase of beacon signals and advertisement packets having timebase offsets between adjacent cells for reserving dynamic resources of guaranteed mobile computing service in cellular network environment is provided to perform prompt processing in a handoff area through distributed arrangement of timebase offsets between cells of the beacon signals, so that resources for the guaranteed mobile computing service can be efficiently reserved and utilized in real time. CONSTITUTION: In a guaranteed mobile computing service under a cellular network environment wherein beacon signals and advertisement signals are used, time offsets of the beacon signals and the advertisement signals between adjacent cells and adjacent domains are periodically supplied.

Description

METHODS OF DISTRIBUTING TIMEBASE OFFSETS BETWEEN THE BEACON SIGNALS AND BETWEEN ADVERTIZEMENT PACKETS OF ADJACENT CELLS, SUPPORTING THE DYNAMIC RESOURCE RESERVATION FOR THE GUARANTEED MOBILE COMPUTING SERVICE UTILIZING THOSE TIMEBASE OFFSETS}

The present invention provides beacon signals and advertisement packets with timebase offsets between neighboring cells for dynamic resource reservation of a guaranteed mobile computing service in a cellular network environment. The present invention relates to a timebase distributed arrangement method of (advertizement packets), and more particularly, to perform fast processing in a handoff region through distributed distribution of timebase offsets between beacon signals in a mobile computing environment through a cellular network. It is about a method.

Conventionally, there is a method in which beacon signals of neighboring base stations (BS) are generated at almost the same time or have a random distribution. In this case, there is no problem in applying a voice service, but resource reservation for existing mobile computing is performed. Since it is difficult to process in real time, an inefficient method such as reserving a resource in advance in all cells around the cell is used.

In the above situation, the multi-casting method is also used for neighboring cells at the same time.

Therefore, when the beacon signals of neighboring base stations occur at about the same time or have a random distribution, there is no problem in application in the case of voice service, but in terms of resource reservation for guaranteed mobile computing service when handoff occurs Difficult to guarantee the reservation of resources. Lack of efficient use of radio resources and methods of pre-reserving resources to all neighboring cells or multicasting to neighboring cells in advance for guaranteed service are wasteful in terms of efficient utilization of radio resources. overhead, too).

SUMMARY OF THE INVENTION The present invention has been made to solve the above shortcomings. The present invention provides a real-time and efficient resource for a guaranteed service by performing fast processing in a handoff region through inter-cell timebase offset distribution arrangement of beacon signals in a mobile computing environment through a cellular network. To provide a timebase distributed placement method of beacon signals and advertising packets with time offset between neighboring cells for dynamic resource reservation of guaranteed mobile computing services in a cellular network environment that supports the reservation and utilization of have.

In order to achieve the above object, the present invention provides a time between the beacon signal and the advertise signal between neighbor cells and neighboring domains in a guaranteed mobile computing service in a cellular network environment using a beacon signal and an advertise signal. It is characterized in that the offset is equally provided in a number of ways at a specific period.

1 is an exemplary cell structure used in a timebase distributed arrangement method of a beacon signal and an advertisement packet having a time offset between neighboring cells for dynamic resource reservation of a guaranteed mobile computing service in a cellular network environment according to the present invention;

2 is a beacon signal and an adverbe used in a method for distributed timebase deployment of advertise packets and beacon signals having time offsets between neighboring cells for dynamic resource reservation of guaranteed mobile computing services in a cellular network environment according to the present invention. Exemplary diagram showing a method of providing offset between transmission and reception of a tight packet,

3 is a diagram illustrating a beacon signal timing offset used in a method for distributing a beacon signal having a time offset between neighbor cells for dynamic resource reservation of a guaranteed mobile computing service and an advertisement packet in a cellular network environment according to the present invention. Example resource reservation operation applied,

4 is a diagram illustrating a beacon signal having a time offset between neighboring cells for dynamic resource reservation of a guaranteed mobile computing service in a cellular network environment according to the present invention, and a beacon signal timing offset in a timebase distributed arrangement method of advertising packets. Exemplary state transition of resource request procedure operation of a host.

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

In order to provide guaranteed mobile computing services in a cellular network, resources must be reserved in advance, and resources must be reserved in case of handoff due to movement of a host. In this case, the method of reserving the resource of the cell to be moved may consider a resource reservation in advance of all six neighboring cells or multicasting to the neighboring six cells when moving to an existing cell. In terms of laterality, a real-time reservation can only be considered when the movement is detected.

1 is a diagram illustrating a cell structure used in a timebase distributed arrangement method of a beacon signal and an advertisement packet having a time offset between neighboring cells for dynamic resource reservation of a guaranteed mobile computing service in a cellular network environment according to the present invention. .

In the figure, when the mobile host MH moves from the base station BS1 cell toward the base station BS2 cell, the mobile host MH enters an overlapping region of periodic beacon signals or an overlapping area of advertising packets, where various The requirements will be reviewed to determine the handoff. It is assumed that the period of the advertisement packet is generally longer than the period of the beacon signal, and mobile computing is based on mobile IP, and a periodic agent has a domain in which one foreign agent (FA) manages multiple cell base stations. It aims at a structure for broadcasting an agent advertizement packet. Handoffs between cells based on beacon signals occur more frequently than mobile IP handoffs between remote agent domains.In the case of cross-domain movements, advertise packets at domain boundaries can also be used as resource reservation triggers. It is based on the beacon signal between cells of short domain period. It is also assumed that all base stations know the identifier (ID) of neighboring base stations.

2 is a beacon signal and an adverbe used in a method for distributed timebase deployment of advertise packets and beacon signals having time offsets between neighboring cells for dynamic resource reservation of guaranteed mobile computing services in a cellular network environment according to the present invention. It is an exemplary diagram showing a method for providing offset between transmission and reception of a tight packet.

In the figure, the beacon signal timebases of all cells are divided into three, and the 0, 1, and 2 marks give an offset in transmission timing from standard global time when the base station of each adjacent cell generates a beacon signal. The degree is shown. That is, if the period is 3, one cell transmits a beacon signal at time points 0, 3, 6, 9, 12, ... and one cell adjacent thereto is 1, 4, 7, 10, 13, ... Transmits a beacon signal and transmits the other one adjacent cell at 2, 5, 8, 11, 14, ... time points.

The remote agent is a node corresponding to a home agent (HA) in the mobile IP and periodically sends an advertisement packet with its own identifier. It registers and manages a mobile host in its own domain. It has the basic function of receiving data from the agent and delivering it to the host. In the same manner as the beacon signal timebase offset of cells, three timing offsets between advertise packets are configured between domains of adjacent remote agents.

In this way, neighboring cells generate beacon signals at different timebases with uniform intervals, which makes it possible to detect the beacon signals of neighboring cells faster when the host moves into the overlap region. This is to ensure that the booking process can be started quickly. In order for each base station to generate a beacon signal with its own timebase, the base station must be able to know the offset given to it, which performs a modulo 3 operation on the identifier of the base station to offset the remainder. When assigning a base station identifier so that it can be used as 0, 1, 2), it is designed and assigned considering the neighboring cells and the entire network. In this case, when there are only two adjacent cells (linear cell arrangement structure), only two offsets are given so as to set intermediate time points of the opposite beacon periods as timebases.

In the case of remote agents, three timebase offsets are set when the three domains are adjacent to each other and two timebase offsets are provided when the two domains are adjacent to each other to reflect the relationship between each domain and the adjacent domain. In the offset setting procedure of the remote agent, the network operator transmits a configuration packet and configures it.

3 is a diagram illustrating a beacon signal timing offset used in a method for distributing a beacon signal having a time offset between neighbor cells for dynamic resource reservation of a guaranteed mobile computing service and an advertisement packet in a cellular network environment according to the present invention. An example of an applied resource reservation operation is shown.

In particular, Figure 3 illustrates the earlier part of the resource reservation operation scenario for the guaranteed mobile computing service to illustrate the application of the timebase offset method according to the present invention.

When the beacon signal period of adjacent cells is very short, detection of the beacon signal may be urgent to use as a trigger for resource reservation. Therefore, the resource reservation procedure is performed earlier than the beacon signal based on the signal attenuation or error rate at the edge of the cell. A case of starting may be considered, and when a signal period is relatively long, it may be assumed that a resource reservation procedure is started when an adjacent beacon signal is detected. When signal attenuation is used as a trigger, countermeasures against propagation loss outside the cell boundary should be supplemented.

In FIG. 3, when a signal attenuation event occurs, the resource reservation application of the mobile host sends a standby reservation request packet that does not include neighbor information. Upon receipt of this, the base station sends a standby reservation request packet to all six neighboring cells to reserve necessary resources from the base station to the neighboring base stations. If a beacon signal of a neighbor cell is detected later, the mobile host sends a standby reservation packet including neighbor information to its base station, which in turn transmits it to a remote agent and waits for standby reservations with other cells that are not in the neighbor information. Release it. The mobile host periodically transmits a standby reservation packet with neighbor information until the handoff is completed, and upon receipt of the mobile host, the mobile station starts to store data to the mobile host at the same time as the transmission and receives the next standby reservation packet. After discarding it, it starts to transfer and save data again. This process is repeated until the handoff is completed to support the guaranteed service.

When the remote agent receives the standby reservation packet with the neighbor information, the remote agent determines whether the base station included in the neighbor information is in its domain, and if it is the internal domain, accepts and notifies or notifies the standby reservation set by the corresponding base station. The reservation is optimized or determined based on internal criteria. If it is not the internal domain, it extends the standby reservation from the self via the remote agent of the neighboring domain to the destination base station and informs the base station of this.

When the handoff between cells or domains is completed, the standby reservation is converted into an active reservation and becomes a transmission path of service data.

4 is a diagram illustrating a beacon signal having a time offset between neighboring cells for dynamic resource reservation of a guaranteed mobile computing service in a cellular network environment according to the present invention, and a beacon signal timing offset in a timebase distributed arrangement method of advertising packets. State transition example of the resource request procedure operation of the host.

In particular, FIG. 4 illustrates a process of initiating and processing a resource reservation by a mobile host initiating the real-time resource reservation procedure of FIG. 3 in a state state diagram (FSM).

In FIG. 4, 1) in the environment where real-time resource reservation is possible only by detecting a beacon signal having a timing offset, the detection process starts from the following 3) when detecting a beacon signal. If a condition such as signal attenuation or packet error increase exceeds a certain threshold before detection of the signal, an event driving mechanism that is driven is used to notify the resource reservation processing module of the event. In the latter case, the signal recovery is eliminated for the occurrence of signal events in areas other than the cell edge region.

2) When a signal event occurs, the resource reservation module transmits a standby reservation request without information about the neighbor to its base station, and the base station which has received this sets up the standby reservation with all neighboring cells.

3) When the beacon signal of the neighboring cell is detected, the mobile host sends a standby reservation request with destination information (base station identifier of the neighboring beacon signal) to its base station.

4) The base station sends a standby reservation request with neighbor information to the remote agent and releases all other standby reservations other than the destination base station. If the standby reservation is not made in 2), the standby reservation is set up with the destination base station.

5) The remote agent establishes a standby reservation with the destination base station and informs the existing base station. In this case, the reservation in the internal domain is set by extending or optimizing the route, and the reservation in the external domain is reserved for the extended route through neighboring remote agents in the external domain.

6) If the existing base station does not go through the optimized reservation route, it sets and releases the remaining standby reservation.

7) In case of reservation to external domain, mobile IP routing update should be done after handoff, when new remote agent negotiates new reservation route with home agent.

8) Once clause 7 is established, the packet is forwarded from the home agent on the new reservation route.

According to this aspect of the present invention, if the period of a known beacon signal is T, to generate a beacon signal having a timing offset and an advertise packet of a mobile IP with three timebases of equal intervals between neighbors. Then, after receiving the beacon signal of the belonging cell in the overlapping region, the beacon signal of the neighboring cell can be received in only 1 / 3T or 2 / 3T. In the case of the advertisement packet, three timing offsets are provided between adjacent domains. It is a new part of the present invention to make early use of this offset information of timing information.

The size of the cellular network that can be applied to the present invention is difficult to apply when the cell size is too small and the minimum time required to pass through the overlap region is within 0.1 second. In addition, the cell size is so large that the minimum boundary transit time is more than 5 seconds, while the benefit of applying too short a beacon period is reduced. Therefore, in general, the application of the present invention is advantageous in situations other than the above two cases.

The present invention belongs to the field of guaranteed mobile computing services in a cellular network environment, and can make real-time reservation and efficient utilization of resources for guaranteed mobile computing services.

As described above, the present invention provides fast processing in the handoff region through the inter-cell timebase offset distribution arrangement of beacon signals in a mobile computing environment through a cellular network, thereby realizing and utilizing real-time and efficient resources for guaranteed services. To support them. Therefore, the utilization of radio band resources in a mobile computing environment is high. The overhead of state information management for executing and managing resource reservations is less than when setting and managing resource reservations with all neighboring cells in advance.

Claims (2)

In a guaranteed mobile computing service using a beacon signal and an advertising signal in a cellular network environment, a plurality of time offsets of the beacon signal and the advertising signal between neighboring cells and neighboring domains are equally provided in a plurality of periods. A timebase distributed placement method of beacon signals and advertising packets having time offsets between neighboring cells for dynamic resource reservation of guaranteed mobile computing services in a cellular network environment. The method of claim 1, The method of claim 1, wherein the plurality of branching distribution methods of beacon signals and advertisement packets with time offsets between neighboring cells for dynamic resource reservation of guaranteed mobile computing services in a cellular network environment are three.