JPH11284587A - Communication channel configuration and communication channel connection control method using the configuration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the availability of a communication channel by providing the communication channel with a speech channel, a connection control channel and a link establishment control channel respectively independently. SOLUTION: This communication channel is constituted of a link establishment control channel, connection control channel and speech channel. A request for securing the connection control channel is made to a base station 2 through the use of the link establishment control channel by a terminal station 1. Connection control is performed from terminal 1 to a call incoming destination via the base station 2, by performing mutual communication of a connection control signal by the use of the established connection control channel and a request for securing the speech channel is made to the base station 2 by the terminal station 1. A request for release of the connection control channel is made to the base station 2 by the terminal station 1. Speech communication is performed by exchanging continuous signals such as voice, etc., by an established speech channel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a multi-carrier T
The present invention relates to a configuration of a communication channel used in a wireless communication system of a DMA (Time Division Multiple Access) system and a communication line connection control method using the communication channel configuration. The present invention relates to a communication channel configuration capable of improving the utilization efficiency of a communication channel and a communication line connection control method using the communication channel configuration.

[0002]

2. Description of the Related Art In recent wireless communication systems, attention has been paid to how many communication lines can be accommodated in limited frequency resources as a major problem.

Conventionally, this kind of communication channel configuration is shown in FIG.
As shown in (1), it is composed of two types of link establishment control channel L and speech channels CH0 to CH7, and is assigned to each channel by multicarrier TDMA divided by frequency and time.

In a conventional communication line connection control method using this communication channel configuration, as shown in FIG.
At the time of a call setup request, the terminal station 10 first requests the base station 20 to allocate a communication channel using the link establishment control channel as a link establishment control phase F11 (step S101), and the communication channel is established (step S101). The link establishment control phase F11 is ended by S102).

[0005] In the next connection control phase F12, connection control communication (step S103) is performed between the terminal station 10 and the base station 20 for connection with a communication destination using the established communication channel. Later, the communication phase F13
, A call communication (step S104) is performed.

[0006] When the call communication in step S104 is completed, a disconnection phase F14 is entered, and after connection control communication (step S105) for confirming the call termination between the terminal station 10 and the base station 20 is performed. From the terminal station 10 to the base station 2
0, there is a request to release the communication channel (step S106), and then, the base station 20 makes the release of the communication channel to the terminal station 10 (step S107), and the call is terminated.

As described above, in the prior art, the speech channel CH once secured in the link establishment control phase is:
It is occupied between the connection control phase for controlling the line connection and the communication phase for transmitting the continuous signal of the call communication.

[0008] A wide signal band necessary for voice and the like must be allocated to the communication channel, but such a wide signal band is not required for the connection control signal used in the connection control communication in the connection control phase. In particular, in the transmission and reception of a short signal such as the connection control signal in the communication using a satellite, the propagation time is long, so that the established and secured communication channel is wasted.

Here, the frequency use efficiency in the connection control phase will be obtained.

The communication line capacity S ₁ and the communication hold time h in the communication phase in which a continuous signal such as voice is actually passed.
_1. Despite the fact that the signal capacity S ₂ and the signal holding time h ₂ in the connection control phase for passing the connection control signal and the communication channel for the communication channel are secured in the connection control phase for passing the connection control signal The relationship between each of the no-signal capacity S ₃ and the no-signal holding time h ₃ where no connection control signal passes and the occurrence rate λ is represented by the following equations 1 to 3.

[0011]

(Equation 1)

[0012]

(Equation 2)

[0013]

(Equation 3) Next, a line capacity S ₄ for random access for securing a communication channel for the connection control phase and a hold time h
Seek the line capacity S ₄ in _4.

First, the throughput g ₁ of the link establishment control channel when there is no retransmission is represented by the following equation (4).

[0015]

(Equation 4) Next, in slotted ALOHA is one of the random access technology in the radio channel, and the first retransmission of the user who failed in transmission of the first time, the throughput g ₂ in conjunction with a user g of newly added following formula 5 Can be indicated by

[0016]

(Equation 5) That is, in the slotted Aloha system, the user from the first retransmission to the retransmission (i-1) th and the user g newly added
The combined throughput g _i can be expressed by the following equation (6).

[0017]

(Equation 6) Therefore, in a transmission path that allows the k-th retransmission,
The value shown in the following equation 7, that is, the probability of normal reception p
May be obtained the capacity S ₄ of the link establishment control channel that satisfies the above value.

[0018]

(Equation 7) Here, in fact, with respect to communication line capacity S ₁ required for the call, since it is not [sigma] s _i is required, this traditional circuit efficiency eta _c is obtained by the following equation 8.

[0019]

(Equation 8)

[0020]

In the communication line connection control method using the above-mentioned conventional communication channel configuration, in a connection control phase in which short signals are exchanged for line connection control, voice communication such as voice is performed. Since a communication channel requiring a wide signal band to be used is used, especially in communication requiring propagation time such as satellite communication, the invalid capacity of the line of the communication channel to be secured increases, and the line utilization efficiency increases. Is reduced.

An object of the present invention is to provide a communication channel configuration capable of solving the above-mentioned problems and improving the use efficiency of a communication channel, and a communication line connection control method using the configuration.

[0022]

In the communication channel configuration according to the present invention, a communication channel used for a wireless communication system of a multi-carrier TDMA (time division multiple access) system includes a communication channel for performing a call communication and a communication channel for a call communication partner. A connection control channel used for communication for line connection control and a link establishment control channel used for establishing the connection control channel are provided independently of each other.

In this configuration, in the connection control channel,
By increasing the degree of multiplexing and using the communication channel exclusively for communication, the utilization efficiency of the communication channel increases.

Further, the connection control channel performs connection control communication used only for securing and establishing a communication channel between the communication communication partners, thereby further improving the use efficiency of the communication channel.

The above-mentioned speech channel, connection control channel, and link establishment control channel may be provided independently in the frequency domain, may be provided independently in the time domain, or may be provided separately in the frequency domain and the time domain. May be provided independently on the region by any combination of the above.

Further, a communication line connection control method according to the present invention uses a communication channel, a connection control channel, and a link establishment control channel based on the above-described communication channel configuration, and performs connection control communication before and after the communication communication using the communication channel. Through the connection control channel,
Specifically, at the time of calling, first, the connection control channel is established using the link establishment control channel, and then the connection control communication, the establishment of the communication channel, and the release of the connection control channel are performed by the connection control channel. Do
Then, a call communication is performed using the established communication channel, and with the termination of the communication communication, the connection control channel is established using the link establishment control channel. Then, the connection control communication is performed using the connection control channel. And release the connection control channel.

[0027]

Next, an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 and 2).

FIG. 1 is a connection control sequence diagram showing one embodiment of the present invention, and FIG. 2 is a communication channel configuration diagram according to the present invention.

In the communication channel configuration according to the present invention, FIG.
As shown in (1), the channel is composed of three types of a link establishment control channel L, a connection control channel C, and a communication channel CH, and is allocated to each channel of the multicarrier TDMA divided by frequency and time. In this example, each of the link establishment control channel L and the connection control channel C has a carrier configuration of one channel and seven communication channels CH1 to CH7 for a total of nine channels with respect to the frequency. Forming a separated channel.

The difference from the prior art is that the connection control channel C
Uses the carrier band of the conventional communication channel CH0.

In the sequence phase of the connection control sequence shown in FIG.
Next to 1, a service channel phase F2 is provided,
Following the communication phase F3, a link establishment control phase F4 is provided before the disconnection phase F5.

In the communication line connection control method using such a communication channel configuration, first, the terminal station 1 making a call setting request connects the line using the link establishment control channel L in the link establishment control phase F1. Is requested to the base station 2 (step S1), and a notification that the connection control channel C has been established is received from the base station 2 (step S2).

In this phase, the terminal station 1 is accessing the base station 2 by the slotted Aloha random access technique, and only when all of the other terminal stations are not accessing, the terminal station 1 normally transmits signals to the base station 2. Can be sent. Therefore, on this condition, it is possible to secure the connection control channel C and shift to the next service channel phase F2 only when the connection control channel C is free.

In the following service channel phase F2,
The connection control signal is mutually communicated using the connection control channel C established between the terminal station 1 and the base station 2 (step S3).
Then, connection control from the terminal station 1 to the destination via the base station 2 is performed, and the terminal station 1 requests the base station 2 to secure a communication channel CH (step S4) and establishes the communication channel CH. The communication channel establishment notification that the communication channel has been established is received (step S5).

With the establishment of the communication channel CH, the terminal station 1 requests the base station 2 to release the connection control channel C (step S6), and receives the release of the connection control channel C from the base station 2 (step S6). Step S7). As described above, after the communication conditions from the calling terminal station to the called terminal station via the base station have been set, it is possible to shift to the next communication phase F3.

Next, continuous communication such as voice is exchanged through the communication channel CH established in the communication phase F3 to perform communication (step S8). The line used is a continuous signal multiplexed by TDMA and is switched in full duplex.

When the call communication in step S8 is completed, a link establishment control phase F4 similar to the first phase is performed, and a connection control channel C for disconnecting the call channel is set.
Is established. That is, the terminal station 1 requests the base station 2 to secure a connection control channel C for connecting a line using the link establishment control channel L (step S9), and the connection control channel C is established from the base station 2. Is received (step S10).

In the subsequent disconnection phase F5, a disconnection procedure is performed. First, the connection control signal is mutually communicated using the connection control channel C established between the terminal station 1 and the base station 2 (step S11). Control is performed from the terminal station 1 to the destination via the base station 2. The terminal station 1 requests the base station 2 to release the communication channel CH (step S12), and the release of the communication channel CH is established. Is received (step S13). Call channel CH
Terminal terminal 1 requests the base station 2 to release the connection control channel C (step S14), and receives a notification from the base station 2 that the connection control channel C has been released, indicating that the connection control channel C has been released (step S14). Step S15).

In such a sequence phase, the communication line capacity S ₁ and the call holding time h ₁ in the above-described communication phase for passing a continuous signal such as voice, the signal in the service channel establishment phase for passing the connection control signal are described. Capacity S ₂ and signal hold time h ₂ , and random access line capacity S ₄ and hold time h ₄ for securing a communication channel for the service channel establishment phase
Is added once each to the line capacity S ₄ and the hold time h _4, and the signal capacity S ₅ and the hold time h ₅ for securing the communication channel.

On the other hand, the conventional random access line capacity S for securing a communication channel for the connection control phase
₃ and the hold time h ₃ are unnecessary.

Therefore, the line efficiency η in the sequence phase according to the present invention is expressed by the following equation (9).

[0042]

(Equation 9) When this equation 9 is compared with the above-mentioned equation 8 indicating the conventional line efficiency, in the present embodiment, although there is an increase by the signal capacity (S ₄ + S ₅ ), the line capacity S ₃ can be deleted. The relationship between the signal capacity (S ₄ + S ₅ ) and the circuit capacity S ₃ greatly depends on the configuration of the wireless communication system.

In particular, when the signal propagation time is long as in a satellite communication system, the free channel capacity S ₃ for communication of the connection control signal is extremely large as compared with the terrestrial network system. Therefore, the number of terminal stations to be accommodated can be increased by thinning channels allocated to each terminal station, lowering the allocated signal band, and increasing the degree of multiplexing of the connection control channel. As a result, the signal capacity of the embodiment as compared to the free bandwidth S ₃ of the conventional example as shown in following equation 10 (S
₄ + S ₅ ) can be made extremely small, so that the line efficiency can be improved.

[0044]

(Equation 10) In this way, the connection control channel is independently set to increase the degree of multiplexing, and the available time is used effectively, so that the channel which has been blocked despite being free can be assigned to another user. Effective use of frequency resources becomes possible. For example, when the communication channel is one carrier and five time division multiplexing and has a period of eight frames, the connection control channel can be one carrier and fourty division time division multiplexing.

In the above communication channel configuration, since connection control information is not transmitted to the communication channel, the scale of the circuit for the communication channel can be simplified, so that both the terminal station and the base station are economical. Can be increased.

As another embodiment, it is possible to release the connection control channel even during the hold time during a call, and to use this time by another station to further improve the line efficiency. That is, the line capacity S ₂ a further time bandwidth spends controls other than latency bandwidth S ₂₁ and calling latency in call incoming call S of the connection control phase for passing conventional connection control signal Decompose into ₂₂ . On the other hand, in the line capacity _{2 according} to the present embodiment, the line capacity S ₄ for random access for securing a communication channel for the service channel establishment phase and the time spent for control other than the waiting time during a call during the hold time h _4. Line capacity S ₂₂
Will be added.

Therefore, when the line capacity S ₂₁ of the waiting time during the ringing of the incoming call is large, the conventional line capacity (S ₂₁
+ S ₂₂ ) further increases, and the line capacity (S ₄ + S
₂₂ ) is extremely small, so that the effect of improving the line efficiency can be further increased.

Further, in the communication of the connection control signal only for disconnection in the disconnection phase of the fifth phase in FIG. 1, the number of connection control signals may be small, and the idle time may be short. In such a case, the link establishment control phase of the fourth phase is omitted, and the disconnection phase is performed from the communication phase of the third phase to the release of the communication channel, which is the last step, as in the conventional case, in the communication channel. It is possible to improve the frequency use efficiency.

In the above description, the communication channel configuration is described in which the link establishment control channel L, the connection control channel C, and the communication channels CH1,..., CH7 are separated for each frequency carrier. A control method in which the carrier frequency is common and separation is performed in slots for each time, or separation in an arbitrary combination of slots for each carrier and time for each frequency depending on frequency can be expected in the same manner as described above.

[0050]

As described above, according to the present invention, a communication channel used in a multi-carrier TDMA wireless communication system is used for a communication channel for performing communication and for communication for controlling line connection between communication partners. A communication channel configuration in which a connection control channel and a link establishment control channel used to establish the connection control channel are independently provided is obtained. Also, using this communication channel configuration, a connection control channel is established using a link establishment control channel when a call is originated, and the connection control channel is used to establish connection control communication, a communication channel, and release of the connection control channel. The call communication is performed using the established communication channel, and a connection control channel is established using the link establishment control channel with the termination of the communication communication. A communication line connection control method for releasing the communication line is obtained.

As a result, especially when the free time capacity of the communication by the connection control signal having a long signal propagation time is large as in a satellite communication system, the multiplexing degree of the connection control channel can be increased to reduce the free time. Thus, the effect that the line efficiency can be improved can be obtained.

Further, since connection control information is not transmitted to the communication channel, the scale of the circuit for the communication channel can be simplified, so that both the terminal station and the base station have the effect of increasing economic efficiency. Obtainable.

[Brief description of the drawings]

FIG. 1 is a connection control sequence diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a communication channel according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a communication channel showing an example of the related art.

FIG. 4 is a connection control sequence diagram showing an example of the related art.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seira Yoneda 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Inventor Osamu Takeda 2-5-15-2 Iwamotocho, Chiyoda-ku, Tokyo (72) Inventor Yukio Hashimoto 2-12-5, Iwamotocho, Chiyoda-ku, Tokyo In-house Research Institute for Next-Generation Satellite Communication / Broadcasting System

Claims (8)

[Claims] A communication channel used in a multicarrier TDMA (time division multiple access) wireless communication system is used for a communication channel for performing communication and a connection control communication for controlling a line connection between communication communication partners. A communication channel configuration wherein a connection control channel and a link establishment control channel used to establish the connection control channel are provided independently of each other. 2. The communication channel configuration according to claim 1, wherein the connection control channel is used only for securing and establishing a communication channel between the communication partners in the connection control communication. 3. The communication channel configuration according to claim 1, wherein the communication channel, the connection control channel, and the link establishment control channel are provided independently in a frequency domain. 4. The communication channel configuration according to claim 1, wherein the communication channel, the connection control channel, and the link establishment control channel are provided independently in a time domain. 5. A communication system according to claim 1, wherein the communication channel, the connection control channel, and the link establishment control channel are provided independently on a region defined by an arbitrary combination of frequency and time. Communication channel configuration. 6. A communication channel based on the communication channel configuration according to any one of claims 1 to 5,
A communication line connection control method, comprising controlling connection of a communication line using a connection control channel and a link establishment control channel. 7. A communication channel based on the communication channel configuration according to any one of claims 1 to 5,
In a communication line connection control method using a connection control channel, and a link establishment control channel, first, when making a call,
The connection control channel is established using the link establishment control channel, and then the connection control communication, the establishment of the communication channel, and the release of the connection control channel are performed by the connection control channel, and then the communication is performed by the established communication channel. A communication line connection control method comprising performing communication. 8. The communication system according to claim 7, wherein the connection control channel is established using the link establishment control channel with the termination of the communication communication, and then the connection control communication and the release of the communication channel are performed by the connection control channel. And a connection control channel is released.