CN1169812A - Subscriber network element - Google Patents

Abstract

A subscriber network element (6) of a radio system providing a wireless local loop for transmitting telecommunication signals between subscriber stations (1, 9, 11) and an exchange (7). To enable a register recall, the subscriber network element (6) comprises a timer means (13), a buffer means (12) arranged to buffer dialling frames, the timer means (13) being arranged to start measuring a new time interval upon reception of each dialling frame, and a control unit (10) arranged to transmit a stand-by message and a register recall message, and to initialize the timer means (13) to measure a time interval of a predetermined length in response to the register recall frame, and to forward a ''dialling received'' frame and any digits buffered to the buffer means (12) as the time interval measured by the timer means (13) elapses.

Description

Subscriber network element

The present invention relates to a kind of wireless system users network element that wireless local loop is provided, this element and switch communication, and comprise and a kind ofly set up wireless connections by base station and the subscriber station that is positioned at the wireless system overlay area, with the device of transmit communications signals between this subscriber station and switch.

The present invention relates to a kind of wireless local loop system (WLL), just a kind of wireless system that wireless local loop is provided, wherein subscriber station is connected to the switch of public switched telephone network via base station and a kind of subscriber network element by wireless connections.Any traditional user interface, just telephone plant can be connected to the WLL system by particular terminal equipment, so radio-ray path is sightless to the user.

The user of WLL system must with the identical mode of common cable network user, obtain the register recall function and the user function of WLL system.In order to make radio-ray path invisible to the user of WLL subscriber station, must be by using subscriber station with the identical mode of traditional telephone.This means that register recall must realize in the following manner that promptly the user at first presses the R key, wait until always, dial in needed number by user interface then to his Sending dialled number sound.

The WLL system is usually based on a kind of known cellular wireless system, and the signaling of the cellular wireless system that for example NMT-450i system (Nordic Mobile Telephone System), thereby their signaling is common and relevant is similar.Like this, following situation is favourable, promptly can also utilize the subscriber station as the wireless cellular system of WLL system-based in the WLL system.For example, according to the standard of NMT-450i system, register recall is carried out in the following manner, promptly at first dials in needed number in the memory of phone, presses the R key then to cause register recall.When using the NMT phone, to compare with being fixed with spider lines, the register recall process is carried out with opposite order, and this is being in-problem aspect subscriber network element of system.

The objective of the invention is to address the above problem and a kind of subscriber network element is provided, this subscriber network element can be handled register recall, and irrelevant with the type of the subscriber station that sends register recall.This purpose is realized by subscriber network element of the present invention, it is characterized in that comprising the timing device in the time interval that is used to measure predetermined length, be used for dialing frame that buffer memory receives up to the buffer unit that exhausts by the measured time interval of timing device, be used for when receiving each dialing frame, beginning to measure the timer in the new predetermined length time interval, and control unit, this control unit is used for sending wait (stand-by) message and sending register recall message to switch to subscriber station, and in response to the reception of register recall frame, the timer in the first predetermined length time interval of initialization survey, and, give switch to any numeral that subscriber station sends " dialing receives " frame and is sent in buffer memory in the buffer unit in response to the timing device end in the measured time interval.

Basic thought of the present invention is when the recall frame sends to the switch of fixed telephone network with relevant dialing by subscriber network element, register recall and correlation function can be realized in a kind of simple and rapid mode, and it is irrelevant with the type of subscriber station, therefore can the performed dialing of analysis user in switch, and this subscriber network element does not need to analyze dialing.Like this, need be in the fixed network switch in subscriber network element already present characteristic.

After receiving the register recall frame, when in subscriber network element, carrying out timing supervision, when the time dialing frame that is received during timing supervision is buffered, and when the dialing frame of each buffer memory is restarted timing supervision, and when when timing supervision exhausts immediately when subscriber station sends " dialing a receives " frame, no matter whether receive any dialing from subscriber station, subscriber network element of the present invention can both be handled this register recall, and irrelevant, and needn't know the type of subscriber station in advance with the type of subscriber station.Like this, the major advantage of subscriber network element of the present invention is that it offers a kind of register recall function of user, and irrelevant with the subscriber station type, and do not need to propose any to the subscriber network element characteristic new demand or make its costliness many.

Preferred embodiment according to subscriber network element of the present invention requires explanation in 2 to 4 at accompanying related right.Below will be by first preferred embodiment, with reference to description of drawings the present invention, wherein

Fig. 1 is the block diagram according to first preferred embodiment of subscriber network element of the present invention, and

Fig. 2 is the flow chart of operation of the network element of key diagram 1.

Fig. 1 is the block diagram of a part that can use the WLL system of the inventive method.WLL system shown in Fig. 1 is based on the NMT-450i system, and this system obtains simplifying by the characteristic of cancellation with the WLL system independence.Base station 5 is corresponding to the base station of NMT-450i (Nordic Mobile Telephone System) cellular wireless system.Like this, aspect signaling, WLL subscriber station 1 moves in almost identical with the common mobile telephone set of NMT-450i system mode.As long as the network operator with subscriber network element 6 programming with from traditional mobile telephone set forwarded calls, also can be from the calling of traditional mobile telephone set 9 of NMT-450i system and 11 by changeing before base station and the subscriber network element 6.Yet NMT phone 9 and 11 only can be used for the overlay area of a base station 5 because the subscriber network element of Fig. 16 does not comprise the transfer device, and by transfer device just can be between base station 5 call transmission.

The subscriber network element 6 of Fig. 1 is connected to the local switch 7 of telephone network, and this telephone network has the Q.512 V2 type of open multiplexer connection of CCITT of the 2 Mbit/s PCM systems of use.Subscriber network element 6 comprises the device that the register recall function is provided to the user in the following manner, promptly by changeing register recall from subscriber network element before the local switch of the PSTN network that has the register recall function.When the control unit 10 of subscriber network element 6 detects register recall frame according to the NMT standard, control unit 10 is confirmed the reception of this recall frame immediately in the following manner, promptly wait for the arrival of news by on radio-ray path, sending one to subscriber station, by sending a register recall message to switch 7, and by initialization timing device 13 to measure predetermined time interval, this predetermined time interval can be, for example 500ms.Subscriber network element switches to standby mode subsequently to be finished up to the time interval of being measured by timer 13.

After switch 7 has sent register recall message, switch 7 exchanges dialing tone to this circuit at subscriber network element 6, and this subscriber network element forwards this subscriber station to before with this dialing tone.

If subscriber network element 6 receives the dialing frame under standby mode, just belong to the dialing of register recall frame, the dialing that control unit 10 will be included in the associated frame offers buffer 12.To the example of each buffering, this timer is initialized to from beginning at first and measures the identical time interval, for example 500ms,

When timing supervision is finally exempted, just by measured time of timer 13 to every exhausting, control unit 10 sends " dialing a receives " message to subscriber station on radio-ray path, any dialing that will may gather in buffer unit 12 is best thereafter sends to switch 7 as voice-frequency dialing.Like this, register recall sends to switch 7 fully, so subscriber network element continues transmit communications signals between switch and subscriber station.If buffer 12 is empty, this means after recall message sends, not send individual digit so far that switch 7 continues to provide dialing tone to this circuit like this to switch 7.Dialing tone is sent out because this subscriber station has switched reply sound pattern after receiving " dialing receives " message thus.

Subscriber station 1 shown in Figure 1 comprises the traditional phone 2 of utilizing voice-frequency dialing and can being connected to the conventional fixed telephone network, and the terminal equipment 3 that is connected to by two-wire circuit 4 of phone 2.Terminal equipment 3 comprises signal processing apparatus, for example a kind of radio-cell, and this radio-cell comprises antenna 8, wireless receiver, wireless launcher and be used for wireless adapter on the wireless channel is adjusted in speech channel.Subscriber station 1 is communicated by letter with base station 5 (the figure shows three base station BSs) by antenna 8, calls out by this base station and is before forwarded to subscriber network element 6, and forward public switched telephone network PSTN to further, just the switch 7 of fixed network.

From user perspective, register recall is carried out by subscriber station 1, as there not being radio-ray path.In other words, when carrying out register recall by subscriber station 1, the user presses the R key under voice mode, waits for dialing tone and dials in numeral subsequently.When the user of phone 2 presses R key (if perhaps this phone is a loop dialing phone, then dialling 1) under voice mode, terminal equipment 3 sends register recall frames and also switches to the R pattern, with by the timing supervision wait acknowledge.Under the R pattern, terminal equipment 3 does not change the signal that is received before phone 2.Receive from subscriber network element 6 wait for the arrival of news after, terminal equipment 3 rests on the R pattern.Subscriber network element 6 is sent up to detect release 500ms timing supervision at terminal equipment after, dialing receives, after the message, terminal equipment 3 just switches reply sound pattern, in that it begins transmit communications signals between subscriber network element 6 and phone 2 under this pattern.Because subscriber network element 6 changes the dialing tone that is provided by switch 7 simultaneously, this dialing tone is before forwarded to the user of subscriber station 1, and the numeral that this user dials in by this phone forwards switch 7 to subsequently before directly in speech channel.

Mobile telephone set 9 shown in Figure 1 is NMT-450i phones, and register recall is carried out in the following manner on this phone, and promptly the user at first dials in the memory of needed number to phone, presses the R key then to activate the register recall function.Mobile telephone set 9 switches to the R pattern subsequently, sends a register recall frame, waits for one and waits for the arrival of news, and after receiving described waiting for the arrival of news, utilize defined number frame in the NMT standard, sends the numeral that the user dialled in from its memory.When numeral is sent out, this phone is waited for " dialing receives " message from subscriber network element 6, and it switches to voice mode afterwards.

Because mobile telephone set 9 sends the numeral that the user dialled in after waiting for the arrival of news immediately receiving from its memory, before receiving the first number frame, do not finish by time interval of the measured 500ms of the timer of subscriber network element.Like this, the control unit 10 number frame that buffer memory received in buffer 12, and the initialization timing device is to measure the time interval of a new 500ms to the example of each buffering.After phone 9 had sent a last dialing frame, the timing supervision of timer 13 was just exempted, thereby sends one to mobile telephone set 9, and dialing receives, message, and the numeral of institute's buffer memory is preferably before forwarded to switch 7 as voice-frequency dialing.After receiving " dialing receives " frame, this mobile telephone set switches to voice mode, thereby sets up a connection between phone 9 and switch 7.

On the mobile telephone set 11 of NMT-450i system shown in Figure 1, register recall is carried out in the mode identical with subscriber station 1.In other words, the user at first presses the R key under voice mode, phone thereby send a register recall frame and switch to the R pattern to wait for that waits for the arrival of news and " dialing receives " message (after the 500ms timing supervision has been exempted in subscriber network element).Mobile radio station 11 switches reply sound pattern subsequently, thereby the user can dial in needed number by phone after hearing the dialing tone that switch provides.These numerals are used as voice-frequency dialing and forward switch 7 to before mobile radio stations 11.

Fig. 2 is the flow chart of explanation according to the operation of the subscriber network element of Fig. 1.In frame A, the control unit of subscriber network element detects a R frame, just a register recall frame.In frame B, this control unit sends one to subscriber station and waits for the arrival of news and send R message, just a register recall to switch.In frame C, the timer of subscriber network element is initialised to measure predetermined time interval.In frame D, control unit checks whether timing supervision is exempted, and just whether has surpassed predetermined restriction t by the measured time of timer ₀, t ₀Can be 500ms.In frame E, control unit checks whether subscriber station has sent the dialing frame.In frame F, the dialing frame that the control unit buffer memory is received, this timer is initialised (in frame C) to measure a new time interval afterwards.

Finish when control unit detects (in frame D) timing supervision, it sends to " dialing receives " frame of subscriber station (frame G).In frame H, control unit is checked the content of buffer.If numeral is arranged in buffer, this control unit forwards these numerals to switch before as voice-frequency dialing in frame I.Like this, register recall is given to switch before fully, and subscriber network element continues transmit communications signals between subscriber station and switch subsequently.

Be to be understood that above-mentioned explanation and accompanying drawing only are used to illustrate a preferred embodiment according to subscriber network element of the present invention, the present invention is not limited thereto.Therefore, solution of the present invention can also be applied in not the WLL system based on the NMT-450i system.Therefore, the preferred embodiment according to subscriber network element of the present invention can change within the scope of the appended claims.

Claims (4)

1. wireless system users network element (6) that wireless local loop is provided, this element is communicated by letter with switch (7), and comprise a kind of by base station (5) and the subscriber station (1 that is positioned at the wireless system overlay area, 9,11) set up wireless connections, with at subscriber station (1,9,11) device of transmit communications signals is characterized in that subscriber network element (6) comprises and between the switch (7)

Timing device (13), the time interval that is used to measure predetermined length,

Buffer unit (12) is used for dialing frame that buffer memory receives up to being exhausted by the measured time interval of timing device (13), and this timing device (13) is used for time interval of beginning to measure a new predetermined length when receiving each dialing frame, and

Control unit (10), be used for to subscriber station (1,9,11) send and to wait for the arrival of news and send register recall message, and in response to the reception of register recall frame, initialization timing device (13) is to measure for the first predetermined length time interval to switch (7), and in response to timing device (13) end in the measured time interval, give switch (7) to any numeral that subscriber station (1,9,11) sends " dialing a receives " frame and is sent in buffer memory in the buffer unit (12).

2. according to the subscriber network element described in the claim 1, it is characterized in that subscriber network element (6) is used for being received in register recall frame and the dialing frame that the NMT-450i standard defines.

3. according to the subscriber network element described in the claim 1, it is characterized in that subscriber network element (6) comprises the device of being given to switch before frame with buffer memory is as voice-frequency dialing.

4. according to the subscriber network element described in the claim 1, it is characterized in that timing device (12) is used to measure the time interval that duration is approximately 500ms.

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