KR100273136B1 - A method on signaling channel assignment using packet transmission scheme in mobile communication - Google Patents

Abstract

PURPOSE: A signal channel assignment method using a packet transmission method in a mobile communication system is provided to decrease a signal channel hardware by building up signal channel between a terminal and a base station through a time division multiplexing using packet transmission method. CONSTITUTION: If a requested resource is more than an enable signal channel resource, a resource scheduling is performed(61). At this time, the resource scheduling assigns the signal channel according to the order of priority, and the assignment of the resource is performed according to a first in-first out way(64). If a process of a location registration is not requested strictly, the lower order of priority is assigned. If a release of the signal channel resource is requested, a signal channel managing device recovers a pertinent resource(63).

Description

A method on signaling channel assignment using packet transmission scheme in mobile communication}

The present invention relates to a method for allocating a signal channel using a packet transmission method in a mobile communication system. In particular, the present invention relates to an effective signal channel use and a signal at a base station in an IMT-2000 using a code division multiple access (CDMA) method. The present invention relates to a signal channel allocation method using a packet transmission method in a mobile communication system capable of reducing channel hardware requirements.

In a general mobile communication system, since call setup or location registration is performed for each terminal, a signal channel is allocated for each terminal. When the signal traffic is large, the signal channel mainly uses out-of-band signaling that is separate from the traffic channel. The base station requires a hardware device (signal channel card) for modulating and demodulating each signal channel. Therefore, in case of frequent location registration or visibility, if a signal channel hardware device (signal channel card) between the terminal and the base station is provided in one-to-one, the base station should have a large amount of hardware devices. In particular, the code division multiple access demodulator is complicated and its cost and hardware size are small. Further, when the signal channel is not effectively used, the processing capacity of communication traffic for voice / data / video or the like decreases as the amount of signal traffic increases.

Signal traffic does not always exist, and there is a discontinuous characteristic that occurs only when the terminal performs call setup or location registration. Therefore, the signal channel is required only when necessary, and multiple terminals can share one common signal channel in a time-division manner to send signal information. Can give Thus, the hardware device (high-speed processing capacity) for modulation and demodulation of the signal channel information can be greatly reduced by the number multiplexed.

This procedure is a two step process (see Figure 4). Step 1 is a procedure in which a terminal is assigned a signal channel slot, and step 2 is a procedure of exchanging signal information using an assigned signal channel slot. In step 1, the terminal repeatedly transmits a signal channel slot request until the base station acquires it. When the base station catches this request, it sends a response to the signal channel slot request to the terminal and simultaneously allocates signal channel resources. Signal channel resource allocation is performed in units of signal channel slots using a packet transmission scheme. Therefore, the base station processes the common signal channel in which the plurality of signal channels are time-division multiplexed in time order.

Conventional digital cellular methods (e.g., IS-95) use an in-band signaling method that transmits a mixture of signal information and traffic information without using a separate signal channel. This method has no problem for voice-oriented services. In case of pursuing a complex multimedia service such as mobile communication in the future, there is a limit of the transmission signal capacity.

In the case of the European mobile communication system (GSM), the circuit transmission method is provided, which provides a separate dedicated signal channel for each terminal. There is a problem that can not expect the effect of reducing the hardware requirements.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a signal channel allocation method using a packet transmission method in a mobile communication system which reduces the effective signal channel allocation and the size of the signal channel hardware at a base station.

The present invention for achieving the above object is a first step to determine whether the channel resource setting or release request in the current load state of the signal channel resource manager of the control station, and if the resource setting request as a result of the confirmation of the first step general call A second step of increasing the load and calculating a new load by checking whether the first request type is a high priority call type, such as a high priority call type, or the second request type is a low priority call type, such as a location registration call; A third step of reducing the load and calculating a new load if the resource release request is a result of the second step; a fourth step of checking whether the resource is present in the scheduling region after performing resource allocation scheduling; and If the check result data request exists in the scheduling area, after allocating resources, the fifth step of returning to the first step, and the check result of the fourth step, And a sixth step of deleting the resource allocation schedule, deleting the resource allocation scheduling, and returning to the first step. Is achieved.

1 is a block diagram of a general mobile communication system.

2 is a view illustrating a method of operating a signal channel resource, and showing a method of operating a signal channel for a terminal and a signal channel for a terminal.

3 is a diagram illustrating a slot configuration of a common signal channel using a packet transmission scheme.

4 is a flowchart illustrating a signal channel slot resource allocation procedure for a terminal to be allocated one signal channel slot, and a procedure of transmitting and receiving signal information using the assigned signal channel slot.

FIG. 5 is a diagram illustrating an example of a signal channel allocation and signal information transmission procedure between a terminal and a base station on a time axis for better understanding of FIG. 4; FIG.

6 is a diagram illustrating a resource allocation management method of a signal channel slot.

7 is a flowchart illustrating in detail the signaling channel slot resource allocation management procedure of FIG.

<Description of the reference numerals for the main parts of the drawings>

21: dedicated signal channel 22, 24: signal channel card

23: common signal channel of the packet transmission method 34: signal channel slot

35: signal channel super slot

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a general mobile communication system. Between the terminal 11 and the base station 12, there is a traffic channel 15 for transmitting voice, data and video information, and a signal channel 16 for transmitting signal information. In the code division multiple access scheme, each channel is distinguished using a special code, and a hardware device (traffic channel card and signal channel card) for demodulating and demodulating information carried on each channel is embedded in the base station 12. These traffic channels and signaling channels belong to radio channel resources, and there is a radio resource manager 18 in the control station 13 for allocating them to each terminal.

2 illustrates a signal channel operation method for terminal use and a signal channel operation method for terminal use. The former requires a signal channel card 22 for each signal channel 21, while the latter uses a packet transmission scheme to multiplex time-divided signal channels into a single signal channel and sequentially process them. The card 24 reduces the signal channel card requirements of the base station.

3 shows a slot configuration of a common signal channel using a packet transmission scheme. Slot configuration introduces the concept of a general packet transmission method. T5 35 shows a super slot corresponding to the entire signal channel, and one super slot is composed of n signal channel slots. The signal channel slot is allocated to each terminal to be a unit for carrying signal information, a signal channel slot preamble (T1) for finding synchronization and starting point of each signal channel slot, signal channel information (T3) carrying actual signal information, and It consists of a signal channel slot guard (T2) to prevent the overlap between the signal channel slots.

4 is a signal channel slot resource allocation procedure (step 1) for a terminal to be allocated one signal channel slot and a procedure of sending and receiving signal information using the assigned signal channel slot (step 2): step 1 (41) This is done by using the medium access control function between the terminal and the base station. The signal channel slot request 1 of the terminal is repeatedly transmitted through the random access channel (RACH) until the base station catches this request. When the base station catches this request (1), it sends a response (2) to the signal channel slot request to the terminal through the Forward Access Channel (FACH). The base station simultaneously sends a signal channel resource allocation request to the signal channel resource manager 45 of the control station to allocate the signal channel resources. Signal channel resource allocation is performed in units of signal channel slots, and after the allocated signal channel resources are activated between the base station and the control station (5) and 6), the terminal includes the assigned signal channel superslot number and signal channel slot number. (7), 8) Signal information is transmitted and received between the terminal and the base station using the allocated signal channel slots ((9)-(12)).

FIG. 5 is an example illustrating a signal channel allocation and signal information transmission procedure between a terminal and a base station on a time axis for better understanding of FIG. 4. The slot number assigned by the terminal for transmitting signal information to the base station is number 53, and the slot number 3, 54 is allocated in the opposite direction (from the base station to the terminal).

6 shows a signal channel resource allocation management method. Signal channel slot requests can be categorized into two types according to their purpose: call setup and location registration. Signal information generated during communication is outside the scope of the present invention. Once allocated, the signal channel slot is operated by a reservation technique that occupies the signal channel resources until the call setup or location registration procedure is completed. When there are more requested resources than available signal channel resources, resource scheduling is performed according to priority (61), and resource allocation is performed in a first in-first out (64) manner. Location registration, which does not require rigorous real-time processing, gives lower priority than call setup. When the release of the signaling channel resource is requested (62), the signaling channel manager recovers the corresponding resource (63).

FIG. 7 illustrates the signaling channel resource allocation management procedure of FIG. 6 in detail. When the current load of the signal channel resource manager of the control station is N (71), when a channel resource is requested or released (72), the current load is increased after allocating one signal channel slot according to the FIFO method considering the priority. Let's do it. (N1 = N1 + 1, N2 = N2 + 1) If channel resource release is requested, reduce the current load (N). (N = N-1) If there are more requested resources than available signal channel resources, priority is given to priority. Resource allocation scheduling is performed accordingly (76), and if possible, allocates the resource (79) and if not, discards it and deletes it from the resource allocation scheduling (78).

Here, the load refers to the total traffic load to be handled at the control station. The load increases when a new call such as an originating call or a location call is requested, and decreases when the call is released. A load is a demand, and a resource is a supply. That is, the load is increased or decreased in accordance with demand such as a call signal or a location registration call, and the resource corresponds to a supply quantity such as a signal channel resource.

In addition, scheduling is to effectively use resources (signal channels) by scheduling high priority demand first and supplying low priority demand later when supply is greater than supply.

Normal calls have a high priority because they must be processed in real time, and location registration can be handled non-real-time, so it has a low priority.

According to the present invention, the signal channel between the mobile station and the base station is configured by time division multiplexing using a packet transmission method, and in practice, the time channel of the signal channel hardware requirements in the base station is obtained by obtaining the effect of replacing several signal channels with one common signal channel. It can be greatly reduced by the degree of multiplexing, and the terminal and the base station can effectively use the signal channel by sending signal information only during a specific slot time.

Claims (1)

A first step of confirming whether the channel resource is set or released in the current load state of the signal channel resource manager of the control station; If the resource setting request is a result of the checking of the first step, whether the first request type has a high priority such as a general call and the second request type has a low priority such as a location registration call, increases the load and calculates a new load. The second step, A third step of reducing the load and calculating a new load if the resource release request is determined as the second step; A fourth step of checking whether the resource allocation schedule exists within the scheduling region after performing resource allocation scheduling; A fifth step of allocating resources and returning to the first step if the data request of the verification result of the fourth step exists in the scheduling region; As a result of the fourth step, if the scheduling area is exceeded, discarding, deleting from resource allocation scheduling, and the sixth step of returning to the first step, the packet transmission in a mobile communication system characterized in that Signal channel allocation method using the method.

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