JPH07298337A - Radio channel assignment method - Google Patents

Abstract

PURPOSE:To discriminate between a calling request and an incoming call answer and eliminate a waste of channels and improper assignment as to the radio channel assignment of a cordless telephone system by adding an option code to them. CONSTITUTION:In the cordless telephone system based upon STD-28 of RCR, a mobile station sets information (1, 0) in the option field of a request message when calling is requested at a request to establish a link channel or information (1, 1) when an answer to an incoming call is made, and sends it to a base station (S10). The base station refers to the discrimination information and assigns a radio channel under channel assignment conditions for calling (S14 and S15) when a channel request for calling is made (S11). For the incoming call answer (S12), a radio channel is assigned under channel assignment conditions for the incoming call answer (S14 and S15).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio channel allocation method, and more particularly, when a mobile station requests a link channel establishment, whether the request is for a call origination or an incoming call response. By adding the information for identifying, the base station looks at it and performs channel allocation according to the request,
The present invention relates to a wireless channel allocation method that eliminates wasteful channel allocation and speeds up processing.

[0002]

2. Description of the Related Art The second generation cordless telephone system is
Standardization work is done at the Radio System Management Center (RCR), and it is established as RCR STD-28. In the standard, a control channel is provided to establish a communication channel for communication between a mobile station and a base station, and then a communication channel is requested from the mobile station (PS) to the base station (CS). In this way, the CS allocates a communication channel to the PS.

Specifically, in the case of a call, as shown in FIG. 7, first, a link channel establishment request message from the PS to the CS is sent to the SCCH (Signalling C) shown in FIG.
ontrol Channel: A channel for individual cells) is used for transmission. On the other hand, CS returns the link channel assignment with SCCH if there is a wireless channel that can meet the required conditions and is available, and PS and CS establish synchronization on the assigned communication channel and establish a link. Then the PS sends a call setup message to the base station.

In the case of an incoming call, as shown in FIG.
The CS notifies the incoming call by using the PCH (Paging Channel), and establishes a link channel, synchronizes the communication channel, and links between the PS and the CS, which are notified of the incoming call, in the same manner as the calling. Set. Then, the PS sends an incoming call response message to the CS, and in response to this, the CS sends a call setup message to the PS in order to convey information about the incoming call. The SAMB in FIGS. 7 to 9 is Set Asynchronous B.
alanced Mode (asynchronous balanced mode setting frame), FA
CCH (Fast Associated Control Channel) is SACCH (Slow Associated Control Channel).
nnel) is a slow associated channel. ACCH (Associat
An ed control channel) is a bidirectional control channel that a one-to-one specific user occupies, and handles signals and user packets. The SACCH is always used in pairs with the TCH (Traffic Channel).

[0005]

As described above, in the case of an outgoing call and an incoming call, the CS first notifies the PS of the incoming call by the PCH in the case of the incoming call. It is the same except that the call setup is sent at the time of calling and the call response is sent at the time of incoming. Incoming call notification from CS by first PCH is P
It is only a trigger for causing S to make a link channel establishment request, and whether the link channel requested by the PS is for making a call or for answering an incoming call is determined after the link is set up. I don't know until I receive a message or an incoming call response message. For this reason, in RCR STD-28, there is a reason display value of "no empty line on the wired side" as the reason for rejecting channel allocation, but since it is not known whether the request is for an outgoing call, an incoming call is made on the last empty line. In that case, there is a problem that even if a link channel establishment request for an incoming call response is made, the request is rejected for this reason and the incoming call cannot be answered.

[0006] Further, at the time of an incoming call, the PS must request the channel even though the function (LCH (Link Channel) type, etc.) required for the channel is not known, and the CS also needs to request the channel. Since it is not known whether it is an incoming call response, it is impossible to judge whether the requested function is sufficient. Therefore, it is understood that the CS also determines that it is a channel request for making a call for the time being, allocates a channel, and takes the sequence of the incoming call response for the first time when the incoming call response arrives. Even if it is found that the functions do not match, it cannot be dealt with, so it is necessary to start over from establishing the link channel.

Further, when the incoming call and the outgoing call collide with each other, even if the system wants to give priority to the incoming call, if the PS requesting the link channel tries to answer the incoming call if the link channel is not allocated and viewed, let's make the outgoing call. I don't know if
If it was due to an outgoing call, you need to disconnect when you know it and repeat the incoming call sequence.

The present invention has been made in view of the above circumstances, and when the base station (CS) receives a link channel establishment request from the mobile station (PS), it is for making a call. It is an object of the present invention to provide a wireless channel allocation method that identifies whether or not it is for an incoming call response and can perform wireless channel allocation according to each.

[0009]

In order to solve the above problems, the present invention provides: (1) In a wireless channel request system of a cordless telephone system, a mobile station makes a call when a link channel establishment request is made. Information for identifying whether the request is a channel request for call origination by referring to the identification information and adding information for identifying whether the request is for an incoming call response or an incoming call response. For example, assigning a wireless channel according to the channel assignment condition for calling, and if it is for an incoming call response, assigning a wireless channel according to the channel assignment condition for an incoming call response.
(2) The mobile station uses the empty area of the link channel establishment request message to provide information for identifying whether the link channel establishment request is for a call or an incoming call. And (3) the mobile station uses the part of the additional ID field of the destination identification code of the dedicated cell channel (SCCH) carrying the link channel establishment request message to establish the link channel establishment request. It is characterized by transmitting information for identifying whether the call is for an outgoing call or an incoming call.

[0010]

When the PS makes a link channel establishment request,
At the time of the request, information for identifying whether the request is for a call origination or an incoming call response is added and transmitted, and the CS that receives the information refers to the identification information,
If it is a channel request for calling, a wireless channel is allocated according to the channel allocation condition for calling, and if it is for an incoming call response, a wireless channel is allocated according to the channel allocation condition for an incoming call response. . If this identification information is sent using the free area of the link channel establishment request message, it does not affect other operations. Also,
If this identification information is sent by using a part of the additional ID field of the destination identification code of the SCCH that carries the link channel establishment request message, the usage of the additional ID is not restricted by the standard, so that it affects other operations. The identification information can be sent without giving.

[0011]

Embodiments will be described below with reference to the drawings. FIG. 1 is a flowchart for explaining an embodiment of a wireless channel allocation method according to the present invention, and is a flowchart showing a wireless channel request operation of a mobile station (PS) at the time of making a call. Further, FIG. 2 is a flowchart showing a radio channel allocation operation of the base station (CS). Hereinafter, each step will be described in order. First, when the PS knows the user's intention to make a call by off-hook (OFF HOOK) operation, etc., the PS creates a link channel establishment request message,
Its optional fields (octet 5, bit 2,
Information (1, 0) for identifying the channel request for calling is set in 1) (S1). Then, the link channel establishment request message is transmitted on the SCCH (S
2).

Upon receiving this, the CS refers to the option field of the link channel establishment request message (S1
0), since this is (1,0), an attempt is made to acquire a wireless channel according to the channel allocation conditions for calling (S1
1). When the channel can be acquired (S14), the link channel allocation message is transmitted on the SCCH (S15). Also,
When the channel cannot be acquired in S14, the link channel allocation refusal message is transmitted by SCCH (S16). S1
After that, both 5 and S16 perform the same operation as the standard.

FIG. 3 is a flowchart showing a radio channel request operation of the mobile station (PS) at the time of an incoming call. Hereinafter, each step will be described in order. PS is CS to PCH
When an incoming call notification is received, a link channel establishment request message is created, and the option field (octet 5, bit 2, 1) has information (1, 1) for identifying that it is a channel request for an incoming call. ) Is set (S20). Then, the link channel establishment request message is transmitted on the SCCH (S21).

Upon receiving this, the CS refers to the option field of the link channel establishment request message (S1
0), since this is (1, 1), an attempt is made to acquire a wireless channel according to the channel allocation condition for an incoming call (S1
2). The process after S14 is similar to the case of making a call.

Since the standard PS is transmitted with the option field of the link channel establishment request message being (0,0), the CS receiving this will refer to the option field of the link channel establishment request message (S1
0), since this is (0,0), an attempt is made to acquire a wireless channel by the conventional channel allocation method (S13). The process after S14 is similar to the case of making a call.

FIG. 4 is a flow chart for explaining another embodiment of the radio channel allocating method according to the present invention, and is a flow chart showing a radio channel requesting operation when a mobile station (PS) makes a call. Further, FIG. 5 is a flowchart showing a wireless channel request operation when the mobile station (PS) receives an incoming call. Further, FIG. 6 is a flowchart showing a radio channel allocation operation of the base station (CS). Hereinafter, each step will be described in order. In S30, information (1,0) for indicating a channel request for calling is set in bits 2 and 1 of the additional ID of the destination identification code of the SCCH carrying the link channel establishment request message, S40 so,
Similar to S30, except that the information (1,1) indicating that the request is a channel request for an incoming call is set, and the bit 2,1 of the additional ID is looked at in S50 and the processing is distributed. The operation is exactly the same as that of the embodiment shown in FIGS.

As described above, according to the present invention, when a link channel establishment request is made, information for identifying whether the request is for a call origination or an incoming call response is added to the CS.
The CS refers to the identification information, and if it is a channel request for calling, allocates a wireless channel according to the channel allocation condition for calling, and if it is for answering an incoming call, Radio channels are assigned according to channel assignment conditions for incoming call response. Here, it is appropriate from the viewpoint of functional division of the communication module to transfer the identification information by utilizing the empty area of the link channel establishment request message. Further, the identification information of the SCCH carrying the link channel establishment request message is added to the identification information I
It is also possible to transfer by using a part of the D field.

[0018]

As is apparent from the above description, when the link channel allocation method according to the present invention is used, it is possible to determine whether a link channel request is made for a call or an incoming call. Since they can be identified, the link channel can be allocated according to the request, and the processing at the time of collision of incoming and outgoing calls can be speeded up.

[Brief description of drawings]

FIG. 1 is a flowchart illustrating an embodiment of a wireless channel allocation method according to the present invention.

FIG. 2 is a flowchart showing a radio channel allocation operation of a base station (CS) according to the present invention.

FIG. 3 is a flowchart showing a radio channel request operation of a mobile station (PS) according to the present invention.

FIG. 4 is a flowchart illustrating another embodiment of a wireless channel allocation method according to the present invention.

FIG. 5 is a flowchart showing a wireless channel request operation when a mobile station (PS) receives an incoming call according to the present invention.

FIG. 6 is a flowchart showing a radio channel allocation operation of the base station (CS) in the present invention.

FIG. 7 is a diagram showing a part of a conventional standard operation sequence at the time of calling.

FIG. 8 is a diagram showing a part of a conventional standard incoming call operation sequence;

FIG. 9 is a diagram showing a structure of a conventional standard link channel establishment request message and SCCH.

Claims (3)

[Claims] 1. In a wireless channel request system of a cordless telephone system, a mobile station, at the time of a link channel establishment request, information for identifying whether the request is for an outgoing call or an incoming call response. Is added to the base station and transferred to the base station. The base station refers to the identification information, and if it is a channel request for calling, allocates a wireless channel according to the channel allocation condition for calling and If so, a wireless channel allocation method characterized by allocating a wireless channel according to a channel allocation condition for an incoming call response. 2. The mobile station uses an empty area of a link channel establishment request message to identify whether the link channel establishment request is for an outgoing call or an incoming call. The wireless channel allocation method according to claim 1, wherein information is transferred. 3. The mobile station uses the part of the additional ID field of the destination identification code of the dedicated cell channel carrying the link channel establishment request message to determine whether the link channel establishment request is for a call. 2. The wireless channel allocation method according to claim 1, further comprising transmitting information for identifying whether it is for an incoming call.