CN100442876C

CN100442876C - Method for realizing shared reverse signalling channel

Info

Publication number: CN100442876C
Application number: CNB2006100009406A
Authority: CN
Inventors: 王强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-01-16
Filing date: 2006-01-16
Publication date: 2008-12-10
Anticipated expiration: 2026-01-16
Also published as: CN1867115A

Abstract

The present invention relates to a method for realizing sharing reverse signaling channels in the technical field of communication. The method comprises steps that a mobile station MS transmits a reverse signaling with a user identity through a reverse service channel; after receiving the reverse signaling, a base station controller transmits a response message with the user identity to the MS; after the MS receives the response message, the transmitting power on a reverse service channel is closed. The method of the present invention can be used for enabling users on the carrier frequency of the same sector to share one or multiple service channels so as to transmit the reverse signaling; consequently, the system resources are saved, and the system capacity is increased.

Description

A kind ofly realize sharing the method that reverse traffic channel transmits backward signaling

Technical field

The present invention relates to communication technique field, relate in particular to a kind of method that reverse traffic channel transmits backward signaling that realizes sharing.

Background technology

Cdma system is one of current main-stream mobile communication system, has advantages such as power system capacity is big, speech quality is high, strong security.The reverse logic signaling channel is divided into two kinds of r-csch (Reverse Common Signaling Channel) and r-dsch (Reverse Dedicated Signaling Channel) in the cdma system.Wherein r-csch is mapped on the R-ACH (Reverse Access Channel) usually; R-dsch then is mapped on R-FCH (Reverse Fundamental Channel) or the R-DCCH (Reverse Dedicated Control Channel) usually, and these reverse physical channels can be referred to as R-TCH (reverse traffic channel).

CDMA agreement regulation transmits the reverse call signaling when r-csch is used for call setup, the user under the carrier frequency of same sector can share this channel; R-dsch then is that the user is proprietary, and system is that the user distributes behind call setup, and the user can transmit the signalings such as switching, power control of oneself with its.In a word, r-csch or R-ACH are public signaling channels; R-dsch or R-TCH then are special-purpose signaling channels.

Trunked communication system is as a kind of specific schedule communication system, characteristics such as have that channel resource is shared, user grouping, multipriority control, power system capacity are big.Group system is called PTT (PTT push to talk) system again, and its call mode is half-duplex, can carry out between a pair of user, i.e. individual calling; Also i.e. group calling can be carried out between the user in the group.The user presses the PTT key to the system request right of speech in the time of need talking, give prompting of user behind the system authorization, this moment, this user can begin speech, the user can hear talker's speech in the other side or the group, the talker unclamps the PTT key and rings off, and can have repeatedly such PTT mutual in a communication process.The characteristics of this half-duplex call of PTT make group system can accomplish that preceding backward channel is shared, and promptly Traffic Channel of forward direction is given users broadcasting speech in the group, and a reverse channel is used for spoken user and transmits up speech.

At present, the function of realization group system is a research direction of paying close attention in this area on cdma system.Different with time-division system, because the restriction of CDMA agreement and chip, the travelling carriage of CDMA is when being in traffic channel state, be under the talking state, can't be operated in simultaneously on the r-csch, therefore the transmission of PTT right of speech demand signalling must be carried out on Traffic Channel, and the Traffic Channel of CDMA is to the independent allocation separately of the user in each conversation, can't share.

At the problems referred to above, OMA (Open Mobile Alliance) has formulated PoC (based on the PTT of Cellular Networks) standard, it is applicable to the cellular system with certain data service ability, and each user need use the preceding backward channel of a pair of special use, transmits the PTT signaling by the mode of data service.But this method can't realize Channel Sharing, and has the defective that call setup speed is slow, voice delay time is high.

Prior art has proposed the PTT scheme again, and it can only be used for CDMA 1x system, and each user need use the preceding backward channel of a pair of special use, and the PTT signaling sends on dedicated channel.The same existence of this scheme can't realize the defective of Channel Sharing, and simultaneously, the performance performance on CDMA 1x Release 0 is relatively poor, and the preferable performance performance is only just arranged on CDMA 1X Release A.

Summary of the invention

The object of the present invention is to provide a kind of the realization to share the method that reverse traffic channel transmits backward signaling, can make the shared one or more Traffic Channels of user under the carrier frequency of same sector transmit backward signaling, save system resource, increase power system capacity.

The objective of the invention is to be achieved through the following technical solutions:

A kind of realization shared the method that reverse traffic channel transmits backward signaling, comprising:

A, mobile station MS are selected a reverse traffic channel from the reverse traffic channel of having set up, send the backward signaling that has user ID by the reverse traffic channel of selecting;

The response message that has described user ID that B, reception base station controller send.

Before MS sent the described backward signaling that has a user ID, described method also comprised:

MS sends lead code makes base transceiver station catch MS;

Base transceiver station is transmitted to base station controller with described lead code.

Described steps A further comprises:

After base station controller receives described lead code, send response message to MS, MS sends the described backward signaling that has user ID after receiving response message.

Described method further comprises:

MS sends described backward signaling and finishes, receive response message after, be closed in the transmitting power on the described reverse traffic channel; Or,

MS does not receive response message after sending backward signaling many times yet, then stops automatically.

The transmitting power that described MS sends backward signaling obtains by open loop power control, and initial power is done open loop according to the intensity of forward signal and estimated, the subsequent retransmissions predetermined electric power step value that at every turn rises.

As seen from the above technical solution provided by the invention, the present invention has realized that the CDMA group system can share reverse signalling channel, thereby has saved system resource, has increased power system capacity.

Description of drawings

Fig. 1 is a kind of embodiment operational flowchart of the method for the invention.

Embodiment

Core concept of the present invention provides a kind of method that reverse traffic channel transmits backward signaling that realizes sharing, can make the shared one or more Traffic Channels of user under the carrier frequency of same sector transmit reverse letter life, thereby saving system resource increases power system capacity.

The invention provides a kind of method that reverse traffic channel transmits backward signaling that realizes sharing, this method can be applied to CDMA2000, WCDMA or TD-SCDMA, it is that example describes upward that present embodiment is applied to CDMA2000 with this method, can utilize any R-TCH to realize, comprise: R-FCH (Reverse Fundamental Channel), R-DCCH (Reverse Dedicated Control Channel), R-SCH (direction complement channel) etc., present embodiment is referred to as R-TCHs with these reverse traffic channels; F-TCH (forward traffic channel) can be any physical channel, comprising: F-FCH (forward fundamental channel), F-DCCH (Forward Dedicated Control Channel), F-SCH (forward complement channel) etc.; A kind of embodiment operating process of the method for the invention specifically comprises the steps: as shown in Figure 1

Step 1:MS sends lead code Preamble to system on Reverse Pilot Channel R-PICH, BTS is caught MS;

BTS detects the emission of MS, can begin it is transmitted to carry out demodulation;

Step 2:BTS transmits to BSC by reverse traffic frame Abis-IS2000TCH Reverse after capturing the Preamble of MS emission;

After step 3:BSC receives described Preamble, reply to the BTS transmission by forward business frame Abis-IS2000 TCHForward;

After step 4:BTS receives described replying, send response message BS AckOrder to MS by F-TCH;

Because the Preamble on the R-PICH does not contain the sign IMSI of MS, so this message is not with user ID;

After step 5:MS received described response message, beginning sent backward signaling on R-TCHs, because each MS shares reverse traffic channel, so needed to carry the user ID IMSI of MS in the signaling;

The transmitting power of MS obtains by open loop power control, and promptly initial power is done the open loop estimation according to the intensity of forward signal, during subsequent retransmissions, and the certain power that at every turn rises step value; In order to satisfy the needs that a large amount of MS share reverse traffic channel, R-TCHs can set up many, can select a R-TCHs to send when MS sends signaling at every turn at random;

After step 6:BTS received described signaling, Abis-IS2000TCHReverse transmitted to BSC by the reverse traffic frame;

After step 7:BSC receives described signaling, reply to the BTS transmission by forward business frame Abis-IS2000TCHForward;

After step 8:BTS receives described replying, send response message BS AckOrder to MS, carry user's sign IMSI in this message equally by F-TCH;

After step 9:MS receives and replys, be closed in the transmitting power on the R-TCHs, so that give other MS or use next time itself.

Whether in the aforesaid operations process, MS just sends backward signaling after receiving response message, also can adopt following method: when MS sends Preamble after a period of time, receive to reply all to begin to send backward signaling; If when not receiving response message BS Ack Order in the certain hour, think then to send failure that seize R-TCHs simultaneously for fear of a plurality of MS, MS needs random delay a period of time to retransmit again, repeatedly retransmits failure, then stops to send.

In sum, the present invention has realized that the CDMA group system can share reverse traffic channel, thereby has saved system resource, has increased power system capacity.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1, a kind of realization shared the method that reverse traffic channel transmits backward signaling, it is characterized in that, comprising:

2, a kind of realization as claimed in claim 1 shared the method that reverse traffic channel transmits backward signaling, it is characterized in that, before MS sent the described backward signaling that has a user ID, described method also comprised:

MS sends lead code makes base transceiver station catch MS;

3, a kind of realization as claimed in claim 2 shared the method that reverse traffic channel transmits backward signaling, it is characterized in that described steps A further comprises:

4, a kind of realization as claimed in claim 1 shared the method that reverse traffic channel transmits backward signaling, it is characterized in that described method further comprises:

5, a kind of method that reverse traffic channel transmits backward signaling that realizes sharing as claimed in claim 1, it is characterized in that, the transmitting power that described MS sends backward signaling obtains by open loop power control, initial power is done open loop according to the intensity of forward signal and is estimated, the subsequent retransmissions predetermined electric power step value that at every turn rises.