KR100314570B1 - Data communication method and device between subscriber access device and base station in wireless subscriber network system - Google Patents

Abstract

The present invention relates to a method and apparatus for data communication between a terminal and a base station in a wireless subscriber network system capable of reducing power consumption in a data communication method between a terminal and a base station for transmitting and receiving data wirelessly. A plurality of subscribers are connected, and the subscriber access device and the base station perform data communication in a wireless communication method, and the base station transmits and receives a traffic channel and control signal for transmitting and receiving information data to the subscriber. In a wireless subscriber network system which allocates a power control and signal channel and performs data transmission and reception with a corresponding subscriber through an assigned channel, the base station can arbitrarily set a number of subscribers using one subscriber access device. For one subscriber, it handles PPCS channel and traffic channel. A synchronization point is detected based on a first step of allocating a main modem and allocating a submodem that processes only traffic channels for the remaining call setup subscribers, and control information of the PPCS channel received through the main modem set in the first step. And a second step of transmitting the detected synchronization information to the submode set in the first step, and a third step of detecting the synchronization point of the submode based on the channel information received from the main modem in the second step. Characterized in that configured to include.

Description

Data communication method between subscriber access device and base station in wireless subscriber network system and device therefor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless local loop (WLL) system, and more particularly, to reduce power consumption in a data communication system between a terminal and a base station that transmits and receives data wirelessly. A data communication method and apparatus thereof are provided.

In general, in the case of the PSTN network or the Internet network is configured as a wired network, if you want to provide a communication service for a specific subscriber, it is necessary to combine the communication network and the subscriber via a wire. However, if the subscribers are located in a mountainous area or the like, combining the subscribers by wires will cause a great economic loss.

Therefore, recently, a so-called wireless subscriber network system for wirelessly coupling a specific subscriber to a wired network such as a PSTN network has been developed and spread.

1 is a block diagram showing the configuration of a general wireless subscriber network system currently commercialized.

In FIG. 1, reference numeral 1 denotes a subscriber access device for coupling a specific subscriber, which is capable of combining various communication terminals such as a telephone device 2 and a facsimile 3 and a personal computer 4, and also a part thereof. In the case of a subscriber access device, there is also a structure configured to connect an ISDN terminal.

In the drawing, reference numeral 5 denotes a base station which is coupled to the subscriber access device 1 by radio to provide a wireless communication line to the subscriber access device 1, which is connected to the subscriber access device 1 in a CDMA manner. To be combined. In addition, each base station 5 is able to accommodate a total of 80 channels, for example, to provide a communication channel to at least 64 subscriber access devices 1 simultaneously.

In the drawing, reference numeral 6 denotes a base station controller which performs a control process such as controlling a wireless subscriber network system and providing a communication channel to each subscriber access device, for example, 16 base stations (5 _{1 to} 5 _16). It is configured to accommodate).

On the other hand, in the wireless subscriber network system, the subscriber access device and the base station are configured as a radio section, the base station and the subscriber access device through the forward channel from the base station to the subscriber access device and the reverse channel from the subscriber access device to the base station. Data communication between the two will be performed.

That is, in a forward channel from a base station to a subscriber access device, a paging channel, a sync channel, a traffic channel, a pilot power control and signal (PPCS), and a packet traffic channel Channel, and the reverse channel from the subscriber matching device to the base station includes an access channel and a traffic channel.

Meanwhile, the base station transmits a pilot signal transmitted from the subscriber access device to the PPCS channel by being time multiplexed. The subscriber matching device transmits a predetermined signal to the base station in units of 20 ms. In addition, the base station spreads the pilot signal applied from the subscriber station for synchronization acquisition of the subscriber matching device, and finds the synchronization point of the subscriber matching device by integrating it to find the synchronization point when the reference level value is larger.

That is, the base station transmits and receives a control signal such as a synchronization signal with the base station through a PPCS channel applied from a subscriber access device, and transmits and receives information data such as voice and data through a traffic channel.

However, the wireless subscriber network system is configured such that one subscriber access device can accommodate multiple terminals, which means that any terminal provided in the subscriber access device performs data communication with the base station. If the subscriber station wants to perform data communication with another base station, the subscriber access device performs call connection to the base station again and performs data communication with the base station through the PPCS channel and traffic channel allocated from the base station. Done.

That is, when a plurality of terminals accommodated by one subscriber access device desires data communication with a base station, a PPCS channel and a traffic channel are allocated to each terminal. The PPCS channel is a channel for synchronizing the corresponding terminals. In this case, since all of the same information is provided for a plurality of call access terminals accommodated by one subscriber access device, this results in waste of resources.

In addition, since the same information must be transmitted through the assigned PPCS channel for a plurality of call access terminals accommodated by one subscriber access device, power consumption increases accordingly.

Accordingly, the present invention was created in view of the above circumstances, and one main channel modem is set for one subscriber access device and the other channel modem is set as a sub channel modem, and is transmitted to the main channel modem through the PPCS channel. The base station and the subscriber access in the wireless subscriber network system to solve the problem of resource consumption and power consumption by allocating one PPCS channel to one subscriber access device by transmitting the synchronization signal to the subchannel modem. It is an object of the present invention to provide a data communication method between devices and a device thereof.

1 is a system configuration diagram showing an overall configuration of a general wireless subscriber network system.

Figure 2 is a block diagram showing the internal configuration of a base station to which the present invention is applied.

3 is a block diagram functionally showing a data communication device between a subscriber access device and a base station according to the present invention;

* Explanation of symbols for the main parts of the drawings

70: main modem, 71: first dual port RAM (DPRAM),

72: modem interface unit, 73: processor,

74: modem information storage unit, 75: second dual port RAM (DPRAM),

76: submodem.

In the wireless subscriber network system according to the first aspect of the present invention for realizing the above object, a data communication method between a base station and a subscriber access device is connected to a plurality of subscribers using one subscriber access device, The base station performs data communication in a wireless communication method, and the base station allocates a traffic power channel for transmitting and receiving information data and a PPCS (Pilot Power Control and Signal) channel for transmitting and receiving a control signal to a subscriber through an assigned channel. In a wireless subscriber network system performing data transmission and reception with a corresponding subscriber, the base station processes a PPCS channel and a traffic channel for any one subscriber to a plurality of subscribers set up using one subscriber access device. Allocate a modem and handle only traffic channels for the remaining call setup subscribers A first step of allocating a submodem, a synchronization point is detected based on the control information of the PPCS channel received in the mainmode set in the first step, and the detected synchronization information is transmitted to the submode set in the first step In the second step and the second step, the sub-modem is configured to include a third step of detecting its own synchronization point based on the channel information received from the main modem.

In addition, in the wireless subscriber network system according to the second aspect of the present invention for realizing the above object, a data communication device between a base station and a subscriber access device is connected to a plurality of subscribers using one subscriber access device. Data communication between the base station and the base station is performed by a wireless communication method. The base station allocates a traffic power channel for transmitting and receiving information data and a PPCS (Pilot Power Control and Signal channel) for transmitting and receiving a control signal to a subscriber through an assigned channel In a wireless subscriber network system performing data transmission and reception with a corresponding subscriber, the base station transmits and receives a PPCS channel and a traffic channel, and detects a synchronization point of an allocated channel based on a control signal received through the PPCS channel. And the synchronization information detected from the main modem to the subscriber access device. Modem interface unit for transmitting to modem, submodem for performing synchronization detection based on synchronization information received from modem interface unit, and when a plurality of subscribers make a call setup request for one subscriber access device, Allocates a main modem that handles a PPCS channel and a traffic channel to one subscriber, allocates a submode to other call setup subscribers, and controls the modem interface to transfer synchronization information generated from the main modem to the corresponding submodem. It is characterized by comprising a main processor for controlling to send.

That is, according to the above, by allowing a plurality of subscribers to share a control signal received through one channel, it is possible to efficiently use communication resources, and to prevent waste of power for transmitting the same information. It becomes possible.

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing an internal configuration of a base station 50 to which the present invention is applied.

In the figure, reference numeral 51 denotes an antenna for receiving wireless data applied from the subscriber access device 1 and transmitting radio data generated from the base station, and 52 denotes an RF modulation and demodulation on the input data. The RF device performs a low noise amplification function on the data applied from the antenna 1 and a high power amplification function on the data applied from the analog channel unit 53 to be described later.

In addition, reference numeral 53 serves as an interface between the modem 54 and the RF device 51, which will be described later, and converts the digital signal applied from the modem 54 into an analog signal, 51 is an analog channel unit that digitally processes an analog signal applied from 51), and 54 denotes operations such as initial synchronization, code tracking, channel coding, interleaving, spread spectrum, and Viterbi decoding for transmitting traffic and control information in a wireless access section. As a modem (MODEM) to perform, this system is composed of a plurality of modem boards to correspond to the number of subscribers that can be accommodated at the same time, one board can accommodate four or eight channels.

On the other hand, reference numeral 55 divides the E1 frame transmitted from the base station controller 6 into timeslots and allocates the respective frames to the channels of the modem 54, and for each channel data applied from the modem 54. A multiplexing processing device for allocating each timeslot, 56 converts the data applied from the multiplexing processing device 55 into an E1 frame structure and sends it to the base station controller 6 and is applied from the base station controller 6. As an RPC interface, the communication protocol used here uses LAPD.

Further, reference numeral 57 denotes a network synchronizer (NSU) for extracting time information from an E1 frame transmitted from the base station controller 6 and maintaining synchronization with the system clock of the base station. As a processor, it performs overall management and control functions for the apparatus inside the base station and the subscriber access apparatus 1.

In particular, the main processor 58 searches for a modem that is not in use when a call connection request is requested from the subscriber access device 1 and allocates it to each subscriber access device. Assign a modem.

On the other hand, Figure 3 shows a main configuration for explaining the operation of the apparatus according to the present invention, which is a functional separation of the operation between the main processor 58 and the modem (54).

In Fig. 3, reference numeral 70 denotes a main modem for the subscriber access device 1 accommodating a plurality of subscribers, which is assigned to the first caller connected through the subscriber access device 1. Will be set.

Also, reference numeral 71 denotes a first dual port RAM (DPRAM) for performing data communication between the main modem 70 and the processor 73, which is PPCS channel information applied from the main modem 70, for example, timing synchronization. A control signal such as a signal is transmitted to the modem interface unit 72 to be described later.

On the other hand, reference numeral 72 is a modem interface unit for performing an interface function between the processor 73 and the modem, which will be described later, which is PPCS channel information read from the first dual port RAM 71 based on a predetermined control signal. It will be transmitted to the sub-modem 76 through the second dual port ram (75) to be described later.

Further, reference numeral 73 designates a main modem and a submodem for the subscriber access device 1 based on the call connection request data applied from the subscriber access device 1, and thereafter, for the subscriber access device 1; In addition to assigning one PPCS channel and a traffic channel corresponding to the number of call connection request subscribers, and when a plurality of subscribers perform data communication with respect to one subscriber access device 1, the PPCS received through the main modem The control information received through the channel is controlled to be transmitted to the submodem.

On the other hand, reference numeral 74 is a modem information storage unit for storing the channel modem assignment information for the subscriber access device 1, for example, the assigned channel modem number and information about the main modem and sub-modem for one subscriber access device. Reference numeral 71 denotes a second dual port RAM (DPRAM) for performing data communication between the processor 73 and the sub-modem, and the PPCS channel information of the main modem, which is applied through the sound modem interface unit 72, will be described later. It performs the function of transmitting to the submodem 76.

In addition, reference numeral 76 performs a modulation / demodulation function on the input data, and detects a synchronization point for communicating with the corresponding subscriber based on the PPCS channel information applied from the second dual port ram 75 based on this. A submode that performs transmission / reception of the modulated data for the subscriber.

Next, the operation of the apparatus shown in FIG. 3 will be described.

First, when a call connection request is received from the subscriber access device 1, the processor 73 allocates a main modem to the first connected subscriber in the absence of a subscriber set up a call. If there is a call connection request from the other subscribers of the subscriber access device 1 while the main modem is assigned to the subscriber access device 1, the subscriber requesting the call connection request is allocated by searching for an unused modem. This modem is considered a submodem. Then, the modem information stored in the modem information storage unit 74 stores the modem information allocated to the subscriber access device 1 and information for distinguishing the main modem and the sub-modem for the assigned modem.

Since only one PPCS channel is allocated to one subscriber access device 1, the allocated PPCS channel is transmitted and received through the main modem.

Meanwhile, the main modem 70 detects its own synchronization point through a pilot signal received through the PPCS channel. The main modem 70 transmits the detected synchronization point to the first dual port RAM 71 at regular intervals. do. In this case, the main modem 70 checks the position of the current detection synchronization point and the previous detection synchronization point, and transmits the information to the first dual port RAM 71 by adding the moving direction (that is, + and-) information. do.

That is, the main modem 70 periodically transmits information on the current sync point and the sync point progress direction to the first dual port ram 71.

On the other hand, the processor 73 when the sub-modem is assigned to the random access unit 1, that is, the other subscriber of the subscriber access unit 1 in the state that one subscriber is connected through the subscriber access unit (1) When an unused modem is allocated due to a call connection request from the processor, the processor 73 stores the information in the modem information storage 74 and, from the main modem assigned to the subscriber access device 1, receives the first dual port. The predetermined control signal for transmitting the synchronization information received through the RAM 71 to the assigned submodem is transmitted to the modem interface unit 72.

That is, the modem interface unit 72 assigns the synchronization information of the main modem 70 received from the first dual port ram 71 based on a predetermined control signal applied from the processor 73 to the sub modem 76. It is sent to the second dual port ram (75) connected to. At this time, the synchronization detection period from the main modem 70 and the synchronization information transmission period from the submodem 76 are the same.

Meanwhile, the synchronization information of the main modem applied from the modem interface 72 to the second dual port ram 75 is transmitted to the sub modem 76 coupled with the second dual port ram 75. The modem 76 finds its own synchronization point based on the synchronization information of the main modem received from the second dual port ram 75.

That is, the submodem 76 calculates the synchronization point in consideration of the delay on the path where the synchronization information is received from the main modem 70 by using the received synchronization point information and the synchronization point progress direction information, and performs synchronization detection. By detecting the synchronization point whose signal level of the synchronization point to be detected is equal to or higher than the reference level.

For example, when the synchronization point received by the main modem 70 is 1204 (chip number), and the traveling direction is "-", the submodem receives "0", "4", "in order at the received synchronization point, that is, 1204. The synchronization point is detected by adding 8 "and" 12 "(number of chips). That is, the synchronization detection level value is calculated at 1204, the synchronization detection level value at 1208, the synchronization detection level value at 1212, and the synchronization detection level value at 1216, and the point where the synchronization detection level value is equal to or greater than the reference synchronization detection level value. Set to sync point.

Therefore, according to the above embodiment, when a plurality of subscribers make a call through one subscriber access device, each traffic channel for transmitting and receiving information data is allocated to each subscriber, and the control signal from the base station is transmitted and received. The PPCS channel is allocated to only one subscriber, and the synchronization signal is transmitted from the modem of the subscriber receiving the PPCS channel to the modem that does not receive the PPCS channel. The data transmission / reception operation can be performed based on the same control information.

That is, by allowing a plurality of subscribers to share a control signal received through one channel, it is possible to efficiently use communication resources and to prevent waste of power for transmitting the same information.

Meanwhile, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical idea of the present invention.

As described above, according to the present invention, by allowing a plurality of subscribers to share a control signal received through one channel, communication resources can be efficiently used and waste of power for transmitting the same information can be obtained. It can be prevented.

Claims (4)

A plurality of subscribers are connected using one subscriber access device, and the subscriber access device and the base station perform data communication in a wireless communication method, and the base station provides a traffic channel and control signal for transmitting and receiving information data to the subscriber. In a wireless subscriber network system which allocates a pilot power control and signal (PPCS) channel for transmitting and receiving and performs data transmission and reception with a corresponding subscriber through an assigned channel, the base station establishes a call using one subscriber access device. A first step of allocating a main modem which processes a PPCS channel and a traffic channel to a plurality of subscribers, and a submode which processes only a traffic channel for the remaining call setup subscribers; and the first step Detect sync point based on PPCS channel control information received from main modem And a second step of transmitting the detected synchronization information to the submode set in the first step, and in the second step, the submodem detects its synchronization point based on the channel information received from the main modem. Data transmission and reception method between a base station and a subscriber access device in a wireless subscriber network system, characterized in that configured to include. 2. The method of claim 1, wherein the synchronization information generated in the main modem in the second step includes current synchronization point information and synchronization point progression information. . A plurality of subscribers are connected using one subscriber access device, and the subscriber access device and the base station perform data communication in a wireless communication method, and the base station provides a traffic channel and control signal for transmitting and receiving information data to the subscriber. In a wireless subscriber network system which allocates a pilot power control and signal (PPCS) channel for transmitting and receiving and performs data transmission and reception with a corresponding subscriber through an assigned channel, the base station transmits and receives a PPCS channel and a traffic channel, A main modem detecting a synchronization point of an allocated channel based on a control signal received through the PPCS channel, a modem interface unit transmitting synchronization information detected from the main modem to a submodem for a corresponding subscriber access device; A submodem for performing synchronization detection based on the synchronization information received from the modem interface unit; When multiple subscribers make a call setup request for one subscriber access device, the main modem that handles the PPCS channel and traffic channel is allocated to any one subscriber, and the submode is allocated to the other call setup subscribers. And a main processor configured to control the modem interface to transmit synchronization information generated from the main modem to the corresponding sub-modem. The method of claim 3, wherein the main modem detects the synchronization point based on the synchronization information received through the PPCS channel, and generates information on the moving direction of the synchronization point in comparison with the previous synchronization point. A data transmission and reception device between a base station and a subscriber access device in a wireless subscriber network system.