CN101959305A - A method for user trial pairing - Google Patents

Abstract

The invention discloses a user trial pairing method suitable for GERAN/VAMOS system. The method pre-sets the timing conditions for stress testing, and the base station selects two users as candidate users; then, the base station orders one of the candidate users to perform When the timing conditions of the stress test are met, the stress test is carried out in the time slot where another candidate user is located, and the channel status is reported; then, the base station adjusts the transmit power of the two candidate users according to the channel status reported by the two candidate users until the two candidate users When the channel quality of the candidate users meets the channel quality requirements, the two candidate users are multiplexed on the same time-frequency resource, and the redundant time-frequency resources are released. The invention also discloses another user trial pairing method. The application of the present invention can realize user trial pairing without requiring the user's mobile station to support multi-slot processing and additional time slots, improve system capacity, and reduce system call drop rate.

Description

A method for user trial pairing

technical field

The invention relates to the technical field of wireless communication, in particular to a user trial pairing method suitable for GERAN/VAMOS system.

Background technique

In recent years, with the rapid growth of mobile voice service demand, GSM network has ushered in a huge development, and limited frequency resources are becoming more and more difficult to meet people's call needs, especially in densely populated cities. In addition, with the increase of the aging degree of the existing GSM network equipment, it is more urgent to expand the capacity of the existing GSM network. However, from the operator's point of view, since the tariff of the voice service decreases year by year, it is necessary to reuse the existing hardware resources and frequency resources more effectively. Therefore, how to increase the system capacity without increasing the frequency resources of the existing system has become a very important research direction.

The technology of Multiple User Reuse One Slot (MUROS: Multiple User Reuse One Slot) is mainly used in 3GPP GSM/EDGE Radio Access Network (GERAN: GSM/EDGE Radio Access Network). MUROS was officially named VAMOS (Voice services over Adaptive Multi-user channels on One Slot) at the GERAN#40 conference in November 2008.

GERAN/VAMOS system needs to further improve voice capacity on the basis of reusing existing network equipment and wireless resources. In the feasibility study stage, the candidate VAMOS solution is mainly to multiplex two or more users in the same time slot without degrading the call quality. At present, the main consideration in the industry is to increase the voice capacity of the system by 2 times, that is, to reuse two users per time slot. On the one hand, affected by this are full-rate and half-rate voice channels, including: TCH/FS, TCH/HS, TCH/EFS, TCH/AFS, TCH/AHS and TCH/WFS, and associated associated control channels, Such as Slow Associated Control Channel (SACCH) and Fast Associated Control Channel (FACCH); on the other hand, after using VAMOS technology, as the number of users in the cell increases, it will inevitably cause the increase of co-channel interference and adjacent channel interference. And lead to lower carrier-to-interference ratio (C/I) and frequency reuse. Therefore, how to achieve a compromise between reducing frequency reuse and increasing time slot reuse requires further research.

There are three main types of existing VAMOS candidate solutions:

Type 1: Co-voice frame (Co-TCH) scheme

In the downlink, linearly merge two Gaussian minimum frequency shift keying (GMSK) baseband modulation signals (the phase difference of the two signals is π/2), perform radio frequency modulation and power amplification, and then transmit;

In the uplink, each mobile station (MS) adopts GMSK modulation and uses a different training sequence (TSC), and uses joint detection and other methods at the base station to separate the multiplexed two-way user signals.

The second: Orthogonal sub-channel (OSC) scheme

In the downlink, quadrature phase shift keying (QPSK) is used to transmit the signals of two users, and at the user receiving end, the signals of each user can be received by GMSK modulation;

In the uplink, each mobile station adopts GMSK modulation and uses different training sequences, and uses methods such as interference elimination at the base station to separate the multiplexed two-way user signals.

The third: Adaptive Symbol Constellation Mapping (ASC) scheme

In the downlink, the alpha-QPSK scheme is adopted, and the transmit power of the I channel and the Q channel can be controlled by adaptively adjusting the constellation mapping;

In the uplink, each mobile station adopts GMSK modulation and uses different training sequences, and uses a multi-user-multiple-input multiple-output (MU-MIMO) receiver at the base station to demodulate the multiplexed two-way user signals.

Although there are differences among the above three solutions, they can all be regarded as two sub-channels, sub-channel 1 and sub-channel 2, sharing the same time-frequency resource. Usually, sub-channel 1 is compatible with earlier mobile phones, and sub-channel 2 can only use mobile phones that support VAMOS technology, hereinafter referred to as VAMOS mobile phones.

FIG. 1 is a schematic diagram of a frame structure of an existing GSM system. Referring to Fig. 1, the GSM system adopts time division multiple access (TDMA) technology, and each TDMA frame is divided into 8 time slots, and the labels are 0, 1, ..., 7 respectively. Both frames and time slots are non-overlapping. A time slot (Slot) is a basic radio resource unit in the GSM system. According to a certain time slot allocation principle, each mobile station can only send signals to the base station in the designated time slot in each frame. Under the condition of timing and synchronization, the base station can receive each mobile station in each time slot respectively. signals without interfering with each other. At the same time, the signals sent by the base station to multiple mobile stations are arranged in sequence and transmitted in predetermined time slots. As long as each mobile station receives within the designated time slot, it can distinguish the signal sent to it from the combined signal.

FIG. 2 is a schematic diagram of two users reusing the same time-frequency resource in the existing GERAN/VAMOS system. In circuit-switched mode, VAMOS allows two users to be multiplexed on the same time-frequency resource. These two users form a VAMOS pair and share the same time slot number in the uplink and downlink. Absolute Radio Frequency Channel Number (ARFCN) and TDMA Frame Number.

Fig. 3 is a schematic diagram of downlink modulation of paired users in the existing GERAN/VAMOS system. VAMOS sub-channel 1 and VAMOS sub-channel 2 shown in Figure 3 are voice traffic channels (TCH) of two users in a VAMOS pairing respectively, and the bits of VAMOS sub-channel 1, VAMOS sub-channel 2 and the corresponding channel-associated control channel are Mapped to an adaptive QPSK (AQPSK) modulation symbol (Si shown in the figure), Si is transmitted after symbol rotation and pulse shaping. At the receiving end, the user demodulates its own TCH channel and the bits of the corresponding channel-associated control channel, and performs radio link measurement.

Fig. 4 is a schematic diagram of paired user uplink modulation in the existing GERAN/VAMOS system. In the uplink, two paired users in the same cell adopt GMSK modulation and send signals on the same time-frequency resource, that is, the two users have the same time slot label, ARFCN and TDMA frame number. The distinction between users depends on the difference in the training sequences in the data sent by the users. In the same cell, users on two subchannels use training sequences in different TSC sets. For example, users on subchannel 1 use training sequences in TSC set 1 (hereinafter referred to as: TSC set 1), and users on subchannel 2 use training sequences in TSC set 1 (hereinafter referred to as: TSC set 1). Use the training sequence in TSC set 2 (hereinafter denoted as: TSC set 2). At the receiving end of the base station, multi-user detection or interference cancellation technology is used to demodulate and decode the received signals of the two users, and at the same time perform corresponding radio link control for the two users.

Although the three existing VAMOS candidate schemes mentioned above ensure the orthogonality between the two multiplexed users at the transmitting end, inter-symbol interference is caused by the multipath propagation characteristics of the wireless channel, and the transmission filter and the non-linear characteristics of the receive filter, will result in signal leakage between the two sub-channels at the receive end. In the downlink, this means that the two users of the multiplex interfere with each other, while in the uplink, the random phase difference between the users makes the orthogonality of the receiving end impossible to guarantee, even when the channel does not experience time-dispersive fading . It is precisely because the orthogonality between the two sub-channels cannot be guaranteed at the receiving end that intra-cell interference (intra-cell interference) occurs, and the two multiplexed sub-channels interfere with each other, causing system performance degradation. When the system pairs two users together, due to the interference between sub-channels, it cannot guarantee that the wireless channel transmission quality of each user is still acceptable, and it cannot be changed quickly by adjusting the transmit power ratio of the paired users. User's channel condition. In this case, it is easy to cause the user to drop calls, resulting in a decrease in service quality.

In view of the above situation, at present, users with good channel conditions and high SNR are mainly selected as candidate paired users, and their transmit power is increased at the same time, in order to ensure that the paired users still have acceptable channel quality. The so-called acceptable channel quality means that according to the GSM system, the user's channel quality is divided into 8 levels, each representing different channel qualities. The channel quality is not lower than a certain threshold level, which can be regarded as acceptable channel quality. Even so, user pairing remains highly uncertain. For example, if the user's initial transmit power is insufficient or the transmit power cannot be quickly adjusted to maintain a satisfactory channel condition, it will also cause call drop, or cause a return from VAMOS multiplexing to a single user occupying a time slot.

In addition, different users receive different levels of interference at different locations, time slots or frequencies, and the interference between sub-channels after user pairing is also different. These factors make it difficult to predict the interference situation.

In a frequency division duplex (FDD) system, the channel conditions of the uplink and downlink are different, especially after the introduction of VAMOS multiplexing, the downlink adopts AQPSK modulation, and the uplink continues to use GMSK modulation, so that the uplink and downlink are subject to Interference is different. In the uplink, the base station needs to determine the initial transmit power after user pairing. These all determine that both uplink and downlink need to be stress tested.

To sum up, before the system decides to pair two users with the same time-frequency resource, it needs to conduct a trial pairing first, that is, let the mobile stations of the two candidate users send or receive dummy data, and use the stress test Trial pairing is carried out in this way, and the transmission power ratio of the mobile stations of the two users is adjusted at the same time, so that the two paired users still have relatively reliable channel transmission quality, thereby reducing the call drop rate. If both the uplink and downlink can meet the channel transmission quality of the paired two users, the trial pairing process is completed, the two users are multiplexed on the same time-frequency resource, and redundant wireless resources are released.

A common trial pairing method in the prior art is: the base station separately allocates a time slot to two candidate users for stress testing. In this time slot, the mobile stations of the two candidate users send or receive imitation data and report the channel measurement report. At the same time, the original time slots of the two users are still reserved for the actual call data of the two users sending or receiving. The disadvantage of this method is that it not only needs an extra time slot for stress testing, but also requires mobile stations of candidate users to support multi-slot processing capability. Therefore, the application range of this method in actual systems is very limited.

There is also a trial pairing method in the prior art: the base station uses the time slot of any one of the two candidate users as the stress test time slot. In this time slot, the mobile station of the candidate user sends or receives imitation data and reports the channel measurement report, while the original time slot of another user is still reserved for the actual call data sending or receiving of the user. Although this method does not require additional time slots for stress testing, it still requires mobile stations of candidate users to support multi-slot processing, which limits the scope of application of this method.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for user trial pairing, which can realize user trial pairing without requiring the user's mobile station to support multi-slot processing and additional time slots, so as to improve the system capacity. And reduce the system drop rate.

In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

A user trial pairing method is applicable to the voice service VAMOS system in which multiple users are multiplexed into the same time slot, and the timing conditions for stress testing are preset. The method also includes:

A. The base station selects two users, the first user and the second user, as candidate users;

B. The base station orders the second user to perform a stress test in the time slot where the first user is located;

C. When the timing conditions for performing the stress test are met, the second user performs the stress test in the time slot where the first user is located, and reports the channel status to the base station;

D. The base station judges whether the channel quality of the first user and the second user meets the preset channel quality requirement according to the channel conditions reported by the first user and the second user, and if so, executes F; otherwise, executes E;

E. The base station adjusts the transmit power of the first user and the second user based on the channel conditions reported by the first user and the second user, and returns to C;

F. The base station multiplexes the first user and the second user on the same time-frequency resource, and releases time-frequency resources occupied by the first user and the second user except for the multiplexed time-frequency resource.

Preferably, the preset timing conditions for stress testing may be: the second user is in the state of discontinuous transmission DTX, and the second user does not need to send the silent period indication SID and the slow associated control channel SACCH in the current frame .

Preferably, the preset timing condition for performing the stress test may be: the second user applies for a voice traffic channel TCH.

The A may include: the base station randomly selects two users as candidate users, or the base station selects two users with similar channel quality as candidate users according to the channel quality of the users.

The B may include: the base station judges whether the mobile stations of the two selected users support VAMOS, and if so, selects any one of the users as the second user, otherwise, selects the user corresponding to the mobile station that does not support VAMOS as the second user. user.

When the preset timing condition for performing the stress test is: when the second user applies for a TCH, the mobile station of the second user supports VAMOS.

In the above B, the manner in which the base station instructs the second user to perform a stress test in the time slot where the first user is located may be: order the candidate user to perform a stress test by assigning a command, and assign the time slot and frequency hopping of the first user The sequence offset MAIO, or the time slot of the first user and the absolute radio frequency channel number ARFCN are carried in the assignment command, and at the same time, the second user is notified to report the channel status.

Preferably, the channel type in the channel description message of the assignment command and the idle bits or the combination of idle bits in the time division multiple access offset field can be used as an indication of whether the command candidate user performs a stress test, and the The time slot and MAIO of the first user, or the time slot and ARFCN of the first user are carried in the channel description message in the assignment command.

When the preset timing condition for stress testing is: the second user is in the DTX state and the second user does not need to send SID and SACCH in the current frame, the assignment command is carried in the fast associated control channel FACCH sent to said second user;

When the preset timing condition for performing the stress test is: when the second user applies for a TCH, the assignment command is carried in an independent dedicated control channel SDCCH and sent to the second user.

In the above C, the stress test performed by the second user on the time slot where the first user is located may be as follows: the second user uses sub-channel 2 of the time slot where the first user is located, using The training sequences in the different training sequence sets send imitation data, or receive imitation data, or send and receive imitation data.

The preset channel quality requirements may be: both the uplink and downlink channel conditions of the two candidate users reach the preset channel quality threshold, or the downlink channel conditions of the two candidate users reach the preset The channel quality threshold of , or the uplink channel conditions of the two candidate users reach the preset channel quality threshold.

A user trial pairing method is applicable to the voice service VAMOS system in which multiple users are multiplexed into the same time slot, and the timing conditions for stress testing are preset. The method also includes:

a. The base station selects candidate users;

b. The base station instructs the candidate users to perform stress tests in their own time slots;

c. When the timing conditions for the stress test are not met, the base station sends the voice data of the candidate user on sub-channel 1 of each candidate user, and sends imitation data on sub-channel 2; carry out the stress test in the When the timing conditions are met, the base station sends imitation data on sub-channel 1 and sub-channel 2 of each candidate user; each candidate user only receives the data on sub-channel 1 of its own time slot, and reports the channel status to the base station ;

d. The base station judges whether the channel quality of the candidate user meets the preset channel quality requirement according to the channel status reported by each candidate user, and if so, executes f, otherwise, executes e;

e. The base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of each candidate user according to the channel status reported by each candidate user, and returns c;

f. The base station multiplexes the candidate users whose channel quality meets the preset channel quality requirements on the same time-frequency resource, and releases the time-frequency occupied by the candidate users except for the multiplexed time-frequency resource resource.

The preset timing conditions for stress testing may be: the candidate user is in the discontinuous transmission DTX state, and the candidate user does not need to send the silent period indication SID and the slow associated control channel SACCH in the current frame.

Preferably, in said a, the number of selected candidate users is two: the first user and the second user;

Said d is: the base station judges whether the channel quality of the first user and the second user meets the preset channel quality requirement according to the channel conditions reported by the first user and the second user, and if so, executes f, otherwise, executes e;

The e is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the first user and the second user in combination with the channel conditions reported by the first user and the second user, and returns c;

The f is: the base station multiplexes the first user and the second user on the same time-frequency resource, and releases the time occupied by the first user and the second user except for the multiplexed time-frequency resource. audio resources.

Preferably, in said a, the number of selected candidate users is more than two;

Said d is: the base station judges whether there are candidate users meeting the preset channel quality requirements according to the channel conditions reported by each candidate user, and if so, ends the stress test on the candidate users, and executes f; Candidate users for stress testing execute e;

The e is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the corresponding candidate user according to the channel quality itself reported by each candidate user, and returns c;

The f is: judging whether there are two candidate users whose channel quality meets the preset channel quality requirements among the candidate users who have completed the stress test and have not yet completed pairing, and if there are, the two candidate users Multiplexing on the same time-frequency resource, releasing the time-frequency resources occupied by the two candidate users except for the multiplexed time-frequency resource, ending the pairing of the two candidate users, and judging Whether there are candidate users whose channel quality has not yet reached the preset channel quality requirement, and if so, execute e for the candidate users whose stress test has not been completed.

The a may include: the base station randomly selects a user as a candidate user, or the base station selects a user with a similar channel quality as a candidate user according to the channel quality of the user.

In the above b, the manner in which the base station instructs the candidate users to perform the stress test in their own time slots may be: using the channel type in the channel description message of the assignment command and the idle bits or idle bits in the time division multiple access offset field The combination of bits is used as an indication of whether to order the candidate user to perform the stress test, to order the candidate user to perform the stress test and report the channel status, and carry the assignment command in the fast associated control channel FACCH and send it to the candidate user.

It can be seen from the above technical solution that the user trial pairing method of the present invention pre-sets the timing conditions for the stress test, and then the base station notifies the candidate user that when the timing condition for the stress test is met, the candidate user will be in the time slot or other time slot where the candidate user is located. Stress test is performed on the time slot where the candidate user is located, and the channel status is reported. Finally, the base station adjusts the transmit power of the candidate user according to the channel status of the candidate user, and when the channel quality of the candidate user reaches the channel quality requirement, the two candidate users Multiplex on the same time-frequency resource and release redundant time-frequency resources. Adopting the method provided by the present invention, on the one hand, it does not need to occupy additional time slot resources; The mobile station supports multi-slot processing. It can be seen that the present invention realizes user trial pairing without requiring the user's mobile station to support multi-slot processing and does not need additional time slots, improves system capacity, and reduces system call drop rate .

Description of drawings

Fig. 1 is the frame structure diagram of existing GSM system;

FIG. 2 is a schematic diagram of two users reusing the same time-frequency resource in the existing GERAN/VAMOS system;

FIG. 3 is a schematic diagram of paired user downlink modulation in an existing GERAN/VAMOS system;

FIG. 4 is a schematic diagram of paired user uplink modulation in an existing GERAN/VAMOS system;

Fig. 5 is a schematic flow chart of the first preferred user trial pairing method of the present invention;

Fig. 6 is a schematic flow chart of the second preferred user trial pairing method of the present invention;

7 is a schematic diagram of a method for performing trial pairing when the user is in the DTX state according to Embodiment 1 of the present invention;

8 is a schematic diagram of a method for trial pairing when a user applies for a TCH voice channel in Embodiment 2 of the present invention;

FIG. 9 is a schematic diagram of a trial pairing method in which candidate users respectively perform a stress test in their respective time slots according to Embodiment 3 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

The main idea of the present invention is to set the timing conditions for stress testing in advance, and then the base station notifies the candidate users to perform stress testing in the time slot where the candidate user is located or in the time slots where other candidate users are located when the timing conditions for stress testing are met. Stress test, and report the channel status. Finally, the base station adjusts the transmit power of the candidate user according to the channel status of the candidate user, and when the channel quality of the candidate user meets the channel quality requirements, multiplex the two candidate users on the same time-frequency resource , releasing redundant time-frequency resources. Adopting the method provided by the present invention, on the one hand, it does not need to occupy additional time slot resources; The mobile station supports multi-slot processing. It can be seen that the present invention realizes user trial pairing without requiring the user's mobile station to support multi-slot processing and does not need additional time slots, improves system capacity, and reduces system call drop rate .

In the following, according to the analysis of the actual call process in the mobile communication system by the inventor of the present application, how to select the timing conditions for the stress test will be described in detail.

Studies have shown that during a call, mobile users usually spend only 40% of the time talking, and most of the time they are not transmitting voice messages. For this reason, the GSM system introduces the mechanism of discontinuous transmission (DTX).

The role of DTX is to:

1. The use of DTX can reduce the interference level in the system and improve the effectiveness of the system;

2. Due to the use of the DTX transmitter, the total transmission time is reduced, and the power consumption is reduced while extending the battery life of the mobile station.

In order to realize DTX, it is necessary to use voice activity detection (VAD) technology, once the speech pauses, it can give instructions in time.

In the DTX state, the mobile station only transmits the inherent SACCH frame and the silent period indicator (SID). SID frames are used to generate "comfort noise", which is artificial and therefore periodically generated so that it does not annoy the listener when it is decoded. The main purpose of using it is to meet the measurement requirements of the system without the need to transmit the voice, and on the other hand, it is intentionally generated so that the listener will not mistakenly believe that the connection is interrupted (that is, the call is dropped). The DTX transmission mode only needs a very low rate to solve it. In this mode, only 260-bit codes are transmitted every 480ms; while in the normal conversation state, the voice stream generates 260-bit codes every 20ms.

In the VAMOS system, DTX plays an important role in reducing the interference between two users multiplexed on the same time-frequency resource in the cell. In the downlink, when the TCH channel adopts DTX technology, for a VAMOS pair, if both users have data to send, that is, when they are both in the non-DTX state, the base station adopts AQPSK modulation, as shown in Figure 3; If the TCH channel of one of the users is in the DTX state, and the other user is in the non-DTX state, then at this time, the base station will send the GMSK modulation signal to the user in the non-DTX state; when the TCH channels of the two users are in the DTX state , the base station only sends DTX information.

Therefore, the present invention proposes: when the candidate user is in the DTX state and the candidate user does not need to send SID and SACCH, the candidate user can perform a stress test, that is: "The candidate user is in the DTX state and the candidate user does not need to send SID and SACCH" can be used as a timing condition for stress testing. Specifically, it can be divided into two situations: the candidate user can perform the stress test on the time slot occupied by itself, or perform the stress test on the time slots of other users.

In addition, when a certain user applies for a TCH channel, the system has completed the authentication and encryption of the candidate user at this time, but has not allocated time-frequency resources for it. The stress test can be carried out according to the slot, that is, "candidate users apply for TCH channels" can also be used as an opportunity condition for stress testing.

Based on the above analysis, the present invention provides two user trial pairing methods, which will be described in detail below with reference to the accompanying drawings.

FIG. 5 is a schematic flowchart of a first preferred user trial pairing method in the present invention. In this preferred method, the candidate users are made to perform a stress test in the time slots where other candidate users are located. Referring to Fig. 5, the method is suitable for GERAN/VAMOS system, and the method includes:

Step 501: Preset the timing conditions for stress testing.

According to the above analysis, the timing condition for stress testing preset in this step may be: the candidate user is in the DTX state, and the candidate user does not need to send SID and SACCH in the current frame (hereinafter referred to as the first timing condition), or Yes: when the candidate user applies for the TCH channel resource (hereinafter referred to as the second timing condition for short).

Step 502: the base station selects two users, the first user and the second user, as candidate users.

In this step, the base station may randomly select two users as candidate users, or select two users with similar channel quality as candidate users according to the channel quality of the users.

If the set timing condition for carrying out the stress test is the second timing condition, then in this step, a voice user and a user who is applying for a TCH channel must be selected as candidate users for trial pairing.

Step 503: the base station orders the second user to perform a stress test in the time slot where the first user is located.

In this step, corresponding to the first timing condition, the base station can judge whether the mobile stations of the two selected users support VAMOS, if yes, select any one of the users as the second user, otherwise, select the mobile station that does not support VAMOS The corresponding user serves as the second user.

Corresponding to the second timing condition, the voice user is taken as the first user, and the user who is applying for the TCH channel is taken as the second user.

In this step, the base station can order the second user to perform a stress test through an assignment command (Assignment Command), and send the time slot and frequency hopping sequence offset (MAIO) where the first user is located, or the time slot where the first user is located The slot and ARFCN are carried in the Assignment Command and sent to the second user. Here, the time slot for the stress test, that is, the time slot where the first user is located must be delivered to the second user, while ARFCN and MAIO are delivered selectively. Whether to issue ARFCN or MAIO depends on whether the system adopts frequency hopping. When the system adopts frequency hopping, MAIO is issued; otherwise, ARFCN is issued.

In specific implementation, you can use the channel type of the Assignment Command's channel description (Channel Description, Channel Description 2 or Channel Description 3) message and the combination of idle bits or idle bits in the TDMA offset (channel type and TDMA offset) field As an indication of whether to order the candidate user to perform a stress test, and send the time slot and MAIO of the first user, or the time slot and ARFCN of the first user in the channel description message carried in the assignment command to the second user .

Corresponding to the first timing condition, the base station may carry the above assignment command on the FACCH channel and send it to the second user;

Corresponding to the second timing condition, the base station may carry the above assignment command in a separate dedicated control channel (SDCCH) and send it to the second user.

Step 504: When the timing condition for performing the stress test is met, the second user performs the stress test in the time slot where the first user is located, and reports the channel status to the base station.

In this step, the first user may not make any changes, and still send and receive data on the sub-channel 1 of its time slot with its original training sequence; while the second user, when the timing conditions for the stress test are met, On sub-channel 2 of the time slot where a user is located, the training sequence in the training sequence set different from the training sequence set used by the first user is used to send imitation data, receive imitation data, or send and receive imitation data.

Among them, according to the needs of practical applications, if only the uplink needs to be stressed, the second user only sends imitation data on subchannel 2 of the time slot where the first user is located; if only the downlink needs to be stressed test, the second user only receives imitation data on subchannel 2 of the time slot where the first user is located; Receive and transmit imitation data on subchannel 2 of the slot.

Step 505: The base station judges whether the channel quality of the first user and the second user meets the preset channel quality requirement according to the channel conditions reported by the first user and the second user. If yes, execute step 507; otherwise, execute step 506.

Here, the channel quality requirements of the uplink and downlink can be treated differently according to the needs of practical applications, that is, different channel quality requirements can be set according to the needs of practical applications, so as to more flexibly adapt to the needs of practical applications. For example, the preset channel quality requirement may be: both the uplink and downlink channel conditions of the two candidate users reach the preset channel quality threshold, or may be the downlink channel conditions of the two candidate users The preset channel quality threshold is reached, or, the uplink channel conditions of the two candidate users reach the preset channel quality threshold.

Considering that the limitation of user pairing in the actual system is mainly concentrated in the downlink, a higher channel quality requirement can be set for the downlink, and a lower channel quality requirement can be set for the uplink, or, considering the complexity, or only consider the channel quality requirements of the downlink.

Step 506: The base station adjusts the transmit power of the first user and the second user based on the channel conditions reported by the first user and the second user, and returns to step 504.

Through the judgment of step 505, this step will be executed when the current channel quality has not reached the preset requirements. Therefore, in this step, after adjusting the transmission power of the first user and the second user, it is necessary to return to step 504 and continue to press test.

Step 507: The base station multiplexes the first user and the second user on the same time-frequency resource, and releases the time-frequency resources occupied by the first user and the second user except for the multiplexed time-frequency resource .

Through the judgment of step 505, when the current channel quality meets the preset requirements, it means that the trial pairing is successful. At this time, the base station multiplexes the candidate users to the same time-frequency resource and releases the redundant time-frequency resource.

So far, the first preferred user trial pairing method of the present invention ends.

FIG. 6 is a schematic flowchart of a second preferred user trial pairing method in the present invention. In this preferred method, the candidate users are made to perform a stress test in their own time slots. Referring to Fig. 6, the method is suitable for GERAN/VAMOS system, and the method includes:

Step 601: Preset the timing conditions for stress testing.

In this step, the pre-set conditions for performing the stress test are: the candidate user is in the DTX state, and the candidate user does not need to send SID and SACCH in the current frame.

Step 602: the base station selects candidate users.

In this step, the base station may randomly select candidate users, or select users with similar channel quality as candidate users according to the channel quality of the users.

In terms of the number of selected candidate users, there are the following two situations:

First case: Select two candidate users. If only two candidate users are selected, it means that these two candidate users are used as trial pairing objects, and the transmit power of these two candidate users will be adjusted in combination with the channel conditions reported by the two candidate users, and when the channel quality requirements are met, Pair the two users together.

The second case: more than two candidate users are selected. If more than two candidate users are selected, it means that the pairing relationship between these candidate users is relatively loose. When adjusting the transmit power, it is only carried out according to the channel conditions reported by each candidate user itself, and it is not necessary to refer to other candidate users. Channel conditions, users with suitable channel conditions will be selected for pairwise pairing according to the channel conditions of these users.

Step 603: the base station instructs the candidate users to perform a stress test in their respective time slots.

In this step, the base station can use the channel type and TDMA offset fields in the Channel Description, Channel Description 2, or Channel Description 3 messages of the Assignment Command as an indication of whether to perform a stress test for the command candidate user. Command candidate users to perform stress tests and report channel conditions, and send the Assignment Command to candidate users in the FACCH.

Step 604: When the timing conditions for stress testing are not met, the base station sends the voice data of each candidate user on sub-channel 1 and the imitation data on sub-channel 2; when the timing conditions for stress testing are met , the base station sends imitation data on sub-channel 1 and sub-channel 2 of each candidate user; each candidate user only receives the data on sub-channel 1 of its own time slot, and reports the channel status to the base station.

Step 605: The base station judges whether the channel quality of the candidate user meets the preset channel quality requirement according to the channel status reported by each candidate user. If so, execute step 607; otherwise, execute step 606.

If only two candidate users are selected in step 602, hereinafter referred to as the first user and the second user, then the processing of this step is: the base station judges the first user and the second user according to the channel conditions reported by the first user and the second user. Whether the channel quality of the second user meets the preset channel quality requirement, if so, go to step 607 , otherwise, go to step 606 .

If more than two candidate users are selected in step 602, the processing of this step is: the base station judges whether there are candidate users that meet the preset channel quality requirements according to the channel conditions reported by each candidate user, and if there is, end the candidate user. For user stress testing, go to step 607; otherwise, go to step 606 for candidate users who have not finished the stress test.

Step 606: The base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of each candidate user according to the channel status reported by each candidate user, and returns to step 604.

If only two candidate users are selected in step 602, the processing of this step is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the first user and the second user in combination with the channel conditions reported by the first user and the second user , return to step 604.

If more than two candidate users are selected in step 602, the processing of this step is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the corresponding candidate users respectively according to the channel quality itself reported by each candidate user, and returns to step 604 .

Step 607: The base station multiplexes the candidate users whose channel quality meets the preset channel quality requirements on the same time-frequency resource, and releases the time-frequency resources occupied by the candidate users except for the multiplexed time-frequency resource.

If only two candidate users are selected in step 602, the processing of this step is: the base station multiplexes the first user and the second user on the same time-frequency resource, and releases the resources occupied by the first user and the second user, Time-frequency resources other than multiplexed time-frequency resources.

If more than two candidate users are selected in step 602, the processing of this step is: judge whether there are two candidate users whose channel quality meets the preset channel quality requirements among the candidate users who have finished the stress test and have not yet completed pairing. candidate users, if they exist, multiplex these two candidate users on the same time-frequency resource, release the time-frequency resources occupied by these two candidate users, except for the multiplexed time-frequency resources, and end the processing of these two candidate users Two candidate users are paired, and it is judged whether there are candidate users whose channel quality has not yet reached the preset channel quality requirement, and if so, step 606 is performed on the candidate users whose stress test has not been completed.

So far, the second preferred user pairing method of the present invention ends.

It can be seen from the above description of the technical solution of the present invention that the user trial pairing method disclosed in the present invention pre-sets the timing conditions for the stress test, and then the base station notifies the candidate user that when the timing condition for the stress test is met, the candidate user is located The time slot of the candidate user or the time slot of other candidate users is stress tested, and the channel status is reported. Finally, the base station adjusts the transmit power of the candidate user according to the channel status of the candidate user, and when the channel quality of the candidate user meets the channel quality requirements, Multiplex the two candidate users on the same time-frequency resource, and release redundant time-frequency resources. Adopting the method provided by the present invention, on the one hand, it does not need to occupy additional time slot resources; The mobile station supports multi-slot processing. It can be seen that the present invention realizes user trial pairing without requiring the user's mobile station to support multi-slot processing and does not need additional time slots, improves system capacity, and reduces system call drop rate .

Give three embodiments below and describe the present invention in detail:

Embodiment one:

This embodiment provides a method for trial pairing when the user is in the DTX state, and the method is applicable to the GERAN/VAMOS system.

FIG. 7 is a schematic diagram of a method for trial pairing when the user is in the DTX state according to Embodiment 1 of the present invention. Referring to Fig. 7, it is assumed that MS1 and MS2 are voice users, occupying TS1 and TS5 respectively. As the load of the system is getting heavier, the base station needs to allocate some users with better channel conditions to the same time slot and the same frequency resource. In order not to affect the user's channel conditions and call quality as much as possible after pairing, it is necessary to conduct a trial pairing before the formal pairing, and adjust the transmit power of the two candidate users by means of a stress test, so that their uplink and downlink Both roads have acceptable channel conditions.

Since in the actual system, not all mobile stations support multi-slot processing capability, in order to expand the scope of application of the trial pairing method of the present invention, this embodiment proposes: when a candidate user is in the DTX state and the current frame does not need to send SID Start trial pairing with SACCH.

The base station uses MS1 and MS2 as two candidate users, if the mobile stations of the two candidate users support VAMOS, then select the time slot where one of the users is located as the stress test time slot, otherwise, select an earlier mobile phone (i.e. : the time slot where the legacy user) is used as the stress test time slot. In the following, it is assumed that the time slot where MS1 is located is selected as the stress test time slot. The base station sends an Assignment Command to MS2 through the FACCH, and uses the idle bit 7 (hereinafter referred to as: bit 7) in the channel type and TDMA offset field of the Channel Description message as an indicator indicating whether to perform a stress test. For example: when bit7=0, it means that the stress test is not performed; when bit7=1, it means that the stress test is started. The timeslot number, MAIO or ARFCN value used in the stress test are given in this message. When MS2 is in the DTX state and does not need to send SID and SACCH in the current frame, it sends or receives imitation data on the TS1 time slot where MS1 is located.

In the channel type and TDMA offset fields, bit 6 is also a free bit and can also be used as an indicator for stress testing. If bit6=0, the stress test is not performed; bit6=1, the stress test is started. Of course, in practical applications, a combination of bit7 and bit6 can also be used as a stress test indicator. In addition, it is also possible to define a variety of methods for using idle bits in the Channel Description message as stress test indicators. In order to avoid the present invention being too redundant, details are not repeated here, but they are all within the protection scope of the present invention.

In the downlink, MS1 receives its own voice data from TS1, and at the same time, MS2 receives imitation data sent by the base station from TS1 when it is in DTX state and does not need to send SID and SACCH in the current frame. Using VAMOS downlink modulation, the voice data sent to MS1 and the imitation data of MS2 are modulated with AQPSK (or AQM, the specific name has not yet been finalized), and MS1 and MS2 receive data from their own sub-channels. Generally, in order to avoid additional signaling overhead, MS1 can receive in the legacy sub-channel mode without changing it, that is, MS1 uses sub-channel 1; MS2 uses sub-channel 2 to receive imitation data, so MS2 must be a VAMOS mobile phone. After receiving the imitation data, MS2 judges the quality of the wireless channel, and reports its own measurement report on the imitation data in the TS1 time slot. The base station adjusts the transmit power on the two sub-channels according to the measurement reports of the two users, in order to make both sub-channels have acceptable channel conditions.

In the uplink, MS1 sends its own voice data in TS1, and at the same time, MS2 also sends GMSK-modulated imitation data in the TS1 time slot in the idle frame. Generally, in order not to change the sending mode of MS1, the training sequence of MS1 remains unchanged, and MS2 uses the training sequence in the corresponding TSC Set2 to send imitation data. After receiving the data of the two users in the TS1 time slot, the base station judges the quality of the wireless channel, and adjusts the transmit power of the two users in the TS1 time slot accordingly, in order to make the uplink of the two users have an acceptable channel condition.

When the uplink and downlink channel conditions of the two candidate users are acceptable, the base station allocates the two users on TS1 and releases the time slot resources originally occupied by MS2 to complete the trial. pairing process. Of course, these two users can also be configured in the time slot occupied by MS2 or other time slots, and then release the redundant resources.

During the trial pairing process, the base station can also send signaling to make MS1 send or receive imitation data on the time slot where MS2 is located when it is in the DTX state and does not need to send SID and SACCH in the current frame. That is to say, as long as any candidate user is in the DTX state and does not need to send SID and SACCH in the current frame, it will send or receive imitation data in the time slot of another user to improve the efficiency of the stress test.

In the trial pairing process, considering the complexity, only the downlink stress test or the uplink stress test may be performed. When making a trial pairing decision, only downlink channel quality requirements may be met, or only uplink channel quality requirements may be met, or both uplink and downlink channel quality requirements may be met.

In the method for performing trial pairing provided in this embodiment, since the user's mobile station only needs to process data in one time slot, the mobile station is not required to support multi-slot transmission capability, which expands the scope of application of the method in this embodiment.

The basic idea of the above-mentioned embodiment is: when the user is in the DTX state and does not need to send SID and SACCH in the current frame, switch to the stress test time slot for trial pairing, send or receive data in the stress test time slot, and report the measurement report; and the base station adjusts the transmission power of each sub-channel accordingly to maintain it at an acceptable level; when both uplink and downlink have acceptable channel conditions, the pairing is completed and redundant resources are released. Therefore, under the condition that the mobile station of the user does not need to support multi-slot processing and does not need additional time slots, user trial pairing is realized, the system capacity is improved, and the system call drop rate is reduced.

In addition to the method mentioned in Embodiment 1 of the present invention, many kinds of methods for stress testing when the user is in the DTX state can be defined based on the main idea of this embodiment, and a stress test indicator is given in the Channel Description message, for To avoid the present invention being too lengthy, details are not repeated here, but all are within the protection scope of the present invention.

Embodiment two:

This embodiment provides a method for trial pairing when a user applies for a TCH voice channel, and this method is applicable to the GERAN/VAMOS system.

FIG. 8 is a schematic diagram of a method for trial pairing when a user applies for a TCH voice channel according to Embodiment 2 of the present invention. Referring to Fig. 8, it is assumed that MS1 is a voice user and occupies a time slot of TS1. As the load of the system is getting heavier, the base station needs to allocate some users with better channel conditions to the same time slot and the same frequency resource. In order not to affect the user's channel conditions and call quality as much as possible after pairing, it is necessary to conduct a trial pairing before the formal pairing, and adjust the transmit power of the two candidate users by means of a stress test, so that their uplink and downlink Both roads have acceptable channel conditions.

Since not all terminals support multi-slot processing capability in an actual system, in order to expand the scope of application of the trial pairing method of the present invention, this embodiment proposes that the base station starts trial pairing when the user starts to apply for a TCH channel. Suppose MS2 is in the process of applying for the TCH channel, and has completed the authentication and encryption, the base station sends the Assignment Command signaling to MS2 through the SDCCH, and gives the available time slot number and MAIO value of MS2, or the time slot in the Channel Description message label and ARFCN. Two users with MS1 and MS2 as candidates, let MS2 send or receive imitation data on the TS1 time slot occupied by MS1.

In the downlink, MS1 receives its own voice data from TS1, and at the same time, MS2 also receives imitation data sent by the base station from TS1. Using VAMOS downlink modulation, the voice data sent to MS1 and the imitation data of MS2 are modulated with AQPSK (or AQM, the specific name has not yet been finalized), and MS1 and MS2 receive data from their own sub-channels. Generally, in order to avoid additional signaling overhead, MS1 can receive in the legacy sub-channel mode without changing it, that is, MS1 uses sub-channel 1; MS2 uses sub-channel 2 to receive imitation data, so MS2 must be a VAMOS mobile phone. After receiving the imitation data, MS2 judges the quality of the wireless channel, and reports its own measurement report on the imitation data in the TS1 time slot. The base station adjusts the transmit power on the two sub-channels according to the measurement reports of the two users, in order to make both sub-channels have acceptable channel conditions.

In the uplink, MS1 sends its own voice data in TS1, and at the same time, MS2 also sends imitation data modulated by GMSK on the TS1 time slot. Generally, in order not to change the sending mode of MS1, the training sequence of MS1 remains unchanged, and MS2 uses the training sequence in the corresponding TSC Set2 to send imitation data. After receiving the data of the two users in the TS1 time slot, the base station judges the quality of the wireless channel, and adjusts the transmit power of the two users in the TS1 time slot accordingly, in order to make the uplink of the two users have an acceptable channel condition.

When the uplink and downlink channel conditions of the two candidate users are acceptable, the base station configures the two users on TS1 to complete the trial pairing process. Of course, these two users can also be allocated in other time slots, and then the redundant resources are released.

During the trial pairing process, the base station can use the SDCCH channel to send Assignment Command signaling, and use the idle bit 7 in the channel type and TDMA offset fields of the Channel Description message as an indicator of whether to perform a stress test. For example, bit 7 = 0, indicating that the stress test will not be performed; bit 7 = 1, the Kinmen County stress test will be started. The timeslot number, MAIO value or ARFCN value used in the stress test are given in this message.

In the trial pairing process, considering the complexity, only the downlink stress test or the uplink stress test may be performed. When making a trial pairing decision, only downlink channel quality requirements may be met, or only uplink channel quality requirements may be met, or both uplink and downlink channel quality requirements may be met.

In the method for performing trial pairing provided in this embodiment, since the user's mobile station only needs to process data in one time slot, the mobile station is not required to support multi-slot transmission capability, which expands the scope of application of the method in this embodiment.

The basic idea of the above-mentioned embodiment is: pair a voice user with a user who is applying for a TCH channel, send or receive data on the time slot occupied by the voice user, and report a measurement report; the base station adjusts the transmission of each subchannel The power is maintained at an acceptable level; when the uplink and downlink have acceptable channel conditions, the pairing is completed and the redundant resources are released. Therefore, under the condition that the mobile station of the user does not need to support multi-slot processing and does not need additional time slots, user trial pairing is realized, the system capacity is improved, and the system call drop rate is reduced.

In addition to the manner mentioned in Embodiment 2 of the present invention, many kinds of stress tests can be defined based on the main idea of this embodiment when a user applies for a TCH channel, and a stress test indicator is given in the Channel Description message, for To avoid the present invention being too lengthy, details are not repeated here, but all are within the protection scope of the present invention.

Embodiment three:

This embodiment provides a method for trial pairing in which candidate users perform stress tests in their respective time slots, and this method is applicable to the GERAN/VAMOS system.

FIG. 9 is a schematic diagram of a trial pairing method in which candidate users respectively perform a stress test in their respective time slots according to Embodiment 3 of the present invention. Referring to Fig. 9, it is assumed that MS1 and MS2 are voice users, occupying time slots TS1 and TS5 respectively.

The base station uses MS1 and MS2 as two candidate users. The base station sends signaling to MS1 and MS2 through the FACCH, and uses the idle bit 7 in the channel type and TDMAoffset fields of the Channel Description message as an indicator of whether to perform a stress test. For example: when bit7=0, it means that the stress test is not performed; when bit7=1, it means that the stress test is started.

The base station adopts the modulation mode of AQPSK, sends voice data on sub-channel 1, and sends imitation data on sub-channel 2. When the user is in the DTX state and does not need to send SID and SACCH in the current frame, the base station still adopts the AQPSK modulation mode to send imitation data on sub-channel 1 and sub-channel 2 at the same time. That is to say: continue to send imitation data in the user's idle frame, so that the downlink does not need to be changed to GMSK modulation to send the imitation data, allowing the user to accept the stress test in the idle frame, which is conducive to obtaining more accurate trial pairing results.

User 1 and User 2 only receive data on sub-channel 1 in time slot TS1 and time slot TS5 respectively, and do not process imitation data sent on sub-channel 2 . On sub-channel 1, voice data is sent in the non-DTX state, and imitation data is sent in the DTX state. User 1 and user 2 report the channel status to the base station according to the received data, and the base station adjusts the transmit power on sub-channel 1 and sub-channel 2 according to the channel status of user 1 and user 2.

If the channel conditions of user 1 and user 2 both meet certain channel quality requirements (set by the system), they are multiplexed on the same time-frequency resource, and redundant wireless resources are released.

During the trial pairing process, considering the complexity, only the downlink stress test may be performed.

In the method for performing trial pairing provided in this embodiment, since the user's mobile station only needs to process data in one time slot, the mobile station is not required to support multi-slot transmission capability, which expands the scope of application of the method in this embodiment.

The basic idea of the above-mentioned embodiment is: when performing trial pairing, when the user is in the DTX state and does not need to send SID and SACCH in the current frame, continue to perform a stress test in the time slot occupied by the user. Receive the imitation data sent by the base station and report the measurement report; the base station adjusts the transmit power on sub-channel 1 and sub-channel 2 accordingly to meet certain channel quality requirements; when the channel conditions of user 1 and user 2 meet certain When the channel quality is required, they are multiplexed on the same time-frequency resource to complete the pairing. Therefore, under the condition that the mobile station of the user does not need to support multi-slot processing and does not need additional time slots, user trial pairing is realized, the system capacity is improved, and the system call drop rate is reduced.

In addition to the method mentioned in Embodiment 2 of the present invention, many kinds of stress tests can be continued in the time slot occupied by the user when the user is in the DTX state based on the main idea of this embodiment, and the stress is given in the Channel Description message The method of testing the indicator, in order to avoid the present invention being too redundant, will not be repeated here, but all are within the protection scope of the present invention.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (17)

1. A user trial pairing method is applicable to the voice service VAMOS system that multiple users are multiplexed to the same time slot, it is characterized in that the timing condition for carrying out the stress test is set in advance, and the method also includes: A. The base station selects two users, the first user and the second user, as candidate users; B. The base station orders the second user to perform a stress test in the time slot where the first user is located; C. When the timing conditions for performing the stress test are met, the second user performs the stress test in the time slot where the first user is located, and reports the channel status to the base station; D. The base station judges whether the channel quality of the first user and the second user meets the preset channel quality requirement according to the channel conditions reported by the first user and the second user, and if so, executes F; otherwise, executes E; E. The base station adjusts the transmit power of the first user and the second user based on the channel conditions reported by the first user and the second user, and returns to C; F. The base station multiplexes the first user and the second user on the same time-frequency resource, and releases time-frequency resources occupied by the first user and the second user except for the multiplexed time-frequency resource. 2. The method according to claim 1, characterized in that: The preset timing conditions for stress testing are: the second user is in the discontinuous transmission DTX state, and the second user does not need to send the silent period indication SID and the slow associated control channel SACCH in the current frame. 3. The method according to claim 1, characterized in that: The preset timing condition for performing the stress test is: the second user applies for a voice traffic channel TCH. 4. The method according to any one of claims 1 to 3, characterized in that: The A includes: the base station randomly selects two users as candidate users, or the base station selects two users with similar channel quality as candidate users according to the channel quality of the users. 5. The method according to claim 2, characterized in that: The B includes: the base station judges whether the mobile stations of the two selected users support VAMOS, if yes, selects any one of the users as the second user, otherwise, selects the user corresponding to the mobile station that does not support VAMOS as the second user . 6. The method according to claim 3, characterized in that: The mobile station of the second user supports VAMOS. 7. The method according to any one of claims 1 to 3, characterized in that: In B, the base station instructs the second user to perform a stress test in the time slot where the first user is located: command the candidate user to perform a stress test by assigning a command, and assign the time slot and frequency hopping sequence of the first user The offset MAIO, or the time slot of the first user and the absolute radio frequency channel number ARFCN are carried in the assignment command, and at the same time, the second user is notified to report the channel status. 8. The method of claim 7, wherein: Use the channel type in the channel description message of the assignment command and the idle bits or the combination of idle bits in the time division multiple access offset field as an indication of whether the command candidate user performs a stress test, and set the location where the first user is located The time slot and MAIO, or the time slot and ARFCN of the first user are carried in the channel description message in the assignment command. 9. The method of claim 7, wherein: When the preset timing condition for stress testing is: the second user is in the DTX state and the second user does not need to send SID and SACCH in the current frame, the assignment command is carried in the fast associated control channel FACCH sent to said second user; When the preset timing condition for performing the stress test is: when the second user applies for a TCH, the assignment command is carried in an independent dedicated control channel SDCCH and sent to the second user. 10. The method according to any one of claims 1 to 3, characterized in that: In the above C, the stress test performed by the second user on the time slot where the first user is located is as follows: the second user uses the training sequence that belongs to the training sequence used by the first user on subchannel 2 of the time slot where the first user is located. The training sequences in the different training sequence sets send imitation data, or receive imitation data, or send and receive imitation data. 11. The method according to any one of claims 1 to 3, characterized in that: The preset channel quality requirements are: the channel conditions of the uplink and downlink of the two candidate users both reach the preset channel quality threshold, or the channel conditions of the downlink of the two candidate users reach the preset threshold. The channel quality threshold, or the uplink channel conditions of the two candidate users reach the preset channel quality threshold. 12. A user trial pairing method is applicable to the voice service VAMOS system that multiple users are multiplexed to the same time slot, it is characterized in that the timing conditions for carrying out the stress test are set in advance, and the method also includes: a. The base station selects candidate users; b. The base station instructs the candidate users to perform stress tests in their own time slots; c. When the timing conditions for the stress test are not met, the base station sends the voice data of the candidate user on sub-channel 1 of each candidate user, and sends imitation data on sub-channel 2; carry out the stress test in the When the timing conditions are met, the base station sends imitation data on sub-channel 1 and sub-channel 2 of each candidate user; each candidate user only receives the data on sub-channel 1 of its own time slot, and reports the channel status to the base station ; d. The base station judges whether the channel quality of the candidate user meets the preset channel quality requirement according to the channel status reported by each candidate user, and if so, executes f, otherwise, executes e; e. The base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of each candidate user according to the channel status reported by each candidate user, and returns c; f. The base station multiplexes the candidate users whose channel quality meets the preset channel quality requirements on the same time-frequency resource, and releases the time-frequency occupied by the candidate users except for the multiplexed time-frequency resource resource. 13. The method of claim 12, wherein: The preset timing conditions for stress testing are: the candidate user is in the discontinuous transmission DTX state, and the candidate user does not need to send the silent period indication SID and the slow associated control channel SACCH in the current frame. 14. The method of claim 13, wherein: In said a, the number of selected candidate users is two: the first user and the second user; Said d is: the base station judges whether the channel quality of the first user and the second user meets the preset channel quality requirement according to the channel conditions reported by the first user and the second user, and if so, executes f, otherwise, executes e; The e is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the first user and the second user in combination with the channel conditions reported by the first user and the second user, and returns c; The f is: the base station multiplexes the first user and the second user on the same time-frequency resource, and releases the time occupied by the first user and the second user except for the multiplexed time-frequency resource. audio resources. 15. The method of claim 13, wherein: In said a, the number of selected candidate users is more than two; Said d is: the base station judges whether there are candidate users meeting the preset channel quality requirements according to the channel conditions reported by each candidate user, and if so, ends the stress test on the candidate users, and executes f; Candidate users for stress testing execute e; The e is: the base station adjusts the transmission power of sub-channel 1 and sub-channel 2 of the corresponding candidate user according to the channel quality itself reported by each candidate user, and returns c; The f is: judging whether there are two candidate users whose channel quality meets the preset channel quality requirements among the candidate users who have completed the stress test and have not yet completed pairing, and if there are, the two candidate users Multiplexing on the same time-frequency resource, releasing the time-frequency resources occupied by the two candidate users except for the multiplexed time-frequency resource, ending the pairing of the two candidate users, and judging Whether there are candidate users whose channel quality has not yet reached the preset channel quality requirement, and if so, execute e for the candidate users whose stress test has not been completed. 16. A method according to any one of claims 12 to 15, characterized in that: The a includes: the base station randomly selects users as candidate users, or the base station selects users with similar channel quality as candidate users according to the channel quality of the users. 17. A method according to any one of claims 12 to 15, characterized in that: In b, the way the base station instructs the candidate users to perform the stress test in their own time slots is: use the channel type in the channel description message of the assignment command and the idle bits or idle bits in the time division multiple access offset field As an indication of whether to order the candidate user to perform the stress test, the candidate user is ordered to perform the stress test and report the channel status, and the assignment command is carried in the fast associated control channel FACCH and sent to the candidate user.

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