CN1801664A - Shared channel power controlling method in trunking communication system - Google Patents

Abstract

The present invention discloses a method for controlling the power of a shared channel in a cluster communication system, which includes: a reverse shared channel power control step, and further includes: step 11, a node B on the network side receives the reverse shared channel sent by a terminal and measures its channel The quality determines its power adjustment scheme based on this; and step 12, the terminal adjusts the transmit power of the reverse shared channel correspondingly according to the power adjustment scheme in the previous step; and the forward shared channel power control step includes: Step 21, the terminal Receiving the forward shared channel sent by Node B and measuring its channel quality, the terminal and/or the radio network controller on the network side determine its power adjustment scheme according to the measured value of its channel quality; and step 22, the network side according to the previous step The power adjustment scheme adjusts the transmit power of the forward shared channel accordingly. By using the power control method of the present invention, the system capacity can be maximized under the premise of ensuring the communication quality.

Description

Power Control Method for Shared Channel in Trunked Communication System

technical field

The present invention relates to the wireless group communication technology, in particular to the code division multiple access wireless group communication technology and the power control method of the shared channel in other point-to-multipoint communication technologies.

Background technique

In the code division multiple access wireless trunking communication system, a key issue is to maximize the system capacity, that is, to maximize the simultaneous processing of users or traffic. Therefore, in this system, under the premise of considering the transmission power and interference, it is very important for the system capacity to achieve the required service quality with the transmission power as low as possible.

For the uplink direction from the terminal to the network side in the system, that is, the reverse direction, if the signal levels of the transmitted signals of each terminal are controlled to be the same when they reach the wireless transceiver device on the network side under the premise of satisfying the communication quality, the system can be made The uplink capacity reaches the maximum. Otherwise, if the signal level of the terminal's transmitted signal reaches the wireless transceiver device on the network side is too low, it will be interfered by signals from other terminals and it is difficult to obtain satisfactory communication quality; and if the signal level is too high, although the terminal Better communication quality can be obtained, but on the one hand, its power consumption is large, which seriously affects the standby time of the terminal under limited battery conditions; on the other hand, high-power signals will interfere with other terminals, thus affecting the communication quality of other terminals.

For the downlink direction from the network side to the terminal in the system, that is, the forward direction, if the channel allocated to each terminal is controlled and the transmission is performed with the minimum power under the premise of meeting the communication quality, the downlink capacity of the system can be maximized . Otherwise, if the transmission power is too low, it will cause difficulty in terminal reception and poor communication quality; and if the transmission power is too high, on the one hand, it will affect other terminals, including other terminals in adjacent cells. If the power on the network side is limited, it will also cause power waste, resulting in reduced capacity.

In order to provide system capacity as much as possible, CDMA communication systems adopt corresponding wireless channel power control solutions. For example, in the point-to-point communication service in UMTS (Universal Mobile Telecommunications System) with code division multiple access, the dedicated wireless channel allocated to each terminal adopts the method of inner loop fast power control and outer loop slow power control, so that each terminal Satisfactory service quality can be obtained under the condition of transmitting power as small as possible. For detailed inner loop power control and outer loop power control methods, please refer to other materials about UMTS.

The trunking communication system is a point-to-multipoint system, and its services are sent to multiple terminals by one information source. For example, when making a group call, although a group can include multiple user terminals, at most one user can be the speaker at the same time Send voice data as a message source to other users in the group. In order to improve the utilization efficiency of wireless resources, a wireless trunking system generally adopts a technology in which multiple terminals share wireless resources. In the cellular trunking communication system, a group of wireless channel resources is allocated for each trunking service in a cell, including an uplink channel and a downlink channel. All group member user terminals in the cell share the wireless channel resource. In the trunking communication system, the resource sharing method of the reverse wireless channel is different from that of the forward direction. For the reverse direction, since at most one speaker in a group can send service information to the network side at the same time, the speaker can use dedicated wireless channel resources or shared wireless channel resources. For the forward direction, the system allocates forward shared channel resources, and multiple user terminals that need to receive service information at the same time use this channel to receive at the same time, so as to improve the utilization efficiency of wireless resources.

In the code division multiple access wireless cluster communication system, since the shared channel is shared by a specific group of users, its usage method is completely different from that of the dedicated channel. Therefore, a special power control method needs to be designed for it. Wherein, the shared channel includes a forward shared wireless channel and a reverse shared wireless channel.

Contents of the invention

The purpose of the present invention is to provide a power control method for a shared channel in a trunking communication system and other point-to-multipoint communication systems, to solve the problem of shared channels in a code division multiple access trunking communication system and other point-to-multipoint communication systems Power control problem.

In order to achieve the above object, the present invention proposes a power control method for a shared channel in a trunking communication system, the shared channel is located between the network side and the terminal, including one of the terminals authorized by the network side as the speaker The reverse shared channel sent to the network side and the forward shared channel sent to multiple terminals by the network side, wherein the network side further includes a radio network controller and a node B, and the method includes: (1) The reverse shared channel power control step further includes: step 11, the node B receives the reverse shared channel sent by the terminal, and measures the channel quality of the reverse shared channel, so as to determine the reverse shared channel A power adjustment scheme for the forward shared channel; and step 12, the terminal adjusts the transmit power of the reverse shared channel accordingly according to the power adjustment scheme in the step 11; and, and (2) forward shared channel power control step , further comprising: step 21, the terminal receives the forward shared channel sent by the node B, and measures the channel quality of the forward shared channel, and the terminal and/or the radio network controller according to the forward shared channel Determine the power adjustment scheme of the forward shared channel according to the channel quality measurement value of the forward shared channel; and step 22, the network side adjusts the transmit power of the forward shared channel correspondingly according to the power adjustment scheme in step 21.

Before the step 11, the radio network controller configures the first target value and the second target value of the reverse shared channel, and sends them to the Node B and the terminal respectively. The terminal determines the initial transmit power of the reverse shared channel according to the second target value, and transmits the reverse shared channel with the initial transmit power.

The step 11 includes that the Node B compares the channel quality measurement value of the reverse shared channel with the first target value, and if the measurement value is greater than/less than the first target value and reaches a reverse greater than / is less than the threshold, then send a power reduction/increase command to the terminal through the forward shared channel, wherein the reverse direction is greater than the threshold and/or the reverse direction is smaller than the threshold configured by the radio network controller and sent to the Node B.

Here, the network side may establish the reverse shared channel for all cells involved in the trunking service, or may only establish the reverse shared channel for the cell where the speaker is located.

In addition, in the step 12, the terminal is further a terminal using the reverse shared channel.

Before the step 21, it also includes that the radio network controller configures the third target value for the forward shared channel, saves it and sends it to the terminal. The radio network controller determines the initial transmission power of the forward shared channel according to the third target value and sends it to the node B, and the node B transmits the forward shared channel to the terminal according to the initial transmission power shared channel.

For a case of the forward shared channel power control method, the step 21 includes, the terminal compares the channel quality measurement value of the forward shared channel with the third target value, if the measured value is less than the specified If it is greater than the third target value and the forward direction is greater than the threshold, send a power increase request to the radio network controller; if it is greater than the third target value and the forward direction is greater than the threshold, send power down request, or do not send any such power up/down requests. The step 22 includes, the radio network controller sends the power increase/decrease of the forward shared channel to the Node B corresponding to the terminal according to the received power increase/decrease request Order. Or the step 22 includes, if the radio network controller does not receive any of the power increase/decrease requests within a first length of time, sending the forward to the Node B corresponding to the terminal A power reduction command for the shared channel, or no command is sent, wherein the first time length is set by the radio network controller. In the step 22, when receiving the power increase/decrease requests sent by multiple terminals at the same time, the radio network controller may process the request with the largest increase/decrease amount.

For another case of the forward shared channel power control method, the step 21 includes that the terminal sends the channel quality measurement value of the forward shared channel to the radio network controller. The step 21 also includes, the radio network controller comparing the channel quality measurement value of the forward shared channel with the third target value, if the measurement value is less than/greater than the third target value and reaches the forward shared channel is less than/greater than the threshold, then send the power increase/decrease command of the forward shared channel to the Node B corresponding to the terminal. Alternatively, the step 21 further includes, if the radio network controller does not receive any channel quality measurement value of the forward shared channel within the first time period, sending a message to the Node B corresponding to the terminal The power reduction command of the forward shared channel, or no command is sent, wherein the first time length is set by the radio network controller. In the step 21, when the channel quality measurement values of the forward shared channel sent by multiple terminals are received at the same time, the radio network controller may process the one with the largest increase/decrease .

For the forward shared channel power control method, the step 22 further includes, if the power increase/decrease command of the forward shared channel sent by the radio network controller includes a specific transmit power value, then the The Node B transmits the forward shared channel according to the specific transmit power value; if not included, the Node B adjusts the current forward shared channel accordingly according to the power increase/decrease step size configured and sent by the radio network controller The transmit power of the forward shared channel.

If the Node B does not receive any power increase and/or decrease command of the forward shared channel within the second time length, correspondingly reduce the transmit power of the forward shared channel according to the power reduction step , wherein the second time length and the power reduction step are set by the radio network controller and sent to the Node B.

Here, the terminal sends the power increase/decrease request and/or the channel quality measurement value of the forward shared channel through the reverse shared channel or the reverse common channel, wherein the reverse common channel A random access channel and/or a physical random access channel may be included. And in the report message of the power increase/decrease request of the forward shared channel and/or the channel quality measurement value of the forward shared channel, at least a cell identifier and/or a cluster service identifier are included.

The terminal regularly sends the channel quality measurement value of the forward shared channel to the radio network controller according to a predetermined period; or the terminal compares the measurement value with the third target value, and if the difference between the two is If the absolute value is greater than the first threshold, then send it to the radio network controller; or the radio network controller uses a measurement control message to control the terminal to report the measurement value through the measurement control process, wherein the predetermined period and/or Or the first threshold is set by the radio network controller.

The radio network controller sets a second threshold, and counts the number of terminals participating in a trunk group call service in a cell; if the statistical result is less than or equal to the second threshold, then use the The forward shared channel power control step; if greater than, the forward shared channel power control step is not used.

In this way, using the above method, the control of the transmission power of the forward shared channel and the reverse shared channel in the trunking communication system and other point-to-multipoint communication systems can be realized, so that the system capacity can be realized under the premise of ensuring the communication quality. maximize.

The present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments.

Description of drawings

FIG. 1 is a schematic diagram of a frame structure of a downlink shared channel in a TD-SCDMA system;

FIG. 2 is a flow chart of the power control method of the reverse shared channel of the present invention; and

FIG. 3 is a flow chart of the power control method of the forward shared channel of the present invention.

Detailed ways

Next, taking the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) technology cluster system as an example, the implementation of the present invention will be described in detail.

The TD-SCDMA cluster system includes user equipment (UE), that is, a terminal, and a radio access network (UTRAN), that is, a network side, which includes a radio network controller (RNC) and a node B (Node B). In the TD-SCDMA trunking communication system, the trunking group call service generally allocates shared channels in units of cells, including reverse shared channels and forward shared channels. The power control of the two shared channels will be described respectively below.

FIG. 2 is a flow chart of a power control method for a reverse shared channel in the present invention. The power control for the reverse shared channel is mainly implemented through the following four steps.

Step 101, at the network side, utilize RNC to determine the channel quality target values of two reverse shared channels, and send the first target value thereof, such as the signal-to-interference ratio (SIR) target value, to Node B; and the second target value , such as the power level value of the reverse shared channel expected to be received by the network side, is sent to the UE. It is worth noting that in the TD-SCDMA trunking communication system, the trunking group call service generally allocates shared channels in units of cells, but since only one group member can use the reverse shared channel as a speaker at the same time in the group call service , so the system can only allocate the reverse shared channel in the cell where the speaker is located. Therefore, when configuring the first target value, the RNC can configure the first target value respectively when establishing the reverse shared channel for all cells involved in the group call service according to the allocation method of the reverse shared channel; The target value is configured when the reverse shared channel is established in the cell where the other party resides. At the same time, on the network side, the RNC also sends the configured target value to the Node B where it is located according to the cell according to the allocation method of the reverse shared channel.

Similarly, when configuring the second target value, different methods may also be adopted according to different ways of allocating the reverse shared channel. If the reverse shared channel is allocated only in the cell where the talker is located, the network side sends the second target value to the UE when establishing and allocating the reverse shared channel to the UE. And if the reverse shared channel is established for all the cells involved in the group call service, the group broadcast method can be used to send the second target value to all UEs through the group broadcast channel when the reverse shared channel is established; of course, for the group service The initiator of the group call, that is, the calling party, may also send the second target value to it during the establishment process of the group call.

Step 102, when the terminal starts to use the reverse shared channel, determine an initial transmit power according to the received second target value, and transmit the reverse shared channel with the initial transmit power. It should be noted that in the trunking communication system, for the reverse shared channel, the UE needs to apply to the trunking service control center, and can use it only after being authorized by the trunking service control center. If the UE applies for and is authorized to use the reverse shared channel, the UE must determine the initial transmission power according to the second target value sent by the RNC, such as the power level value of the reverse shared channel expected to be received by the network side, and use the initial transmission power Power transmit reverse shared channel. In addition, in the trunking communication system based on TD-SCDMA technology, the UE can also use the measured path loss of the primary common control channel (PCCPCH) plus the power of the reverse shared channel that the network side expects to receive The level value is used as the initial transmit power.

Step 103, the network side receives the reverse shared channel, determines how to adjust the transmit power of the terminal's reverse shared channel through measurement and judgment, and sends an adjustment command to the terminal through the forward shared channel. Specifically, on the network side, the Node B receives the reverse shared channel transmitted by the UE and measures its channel quality, such as the SIR parameter, and compares it with the first target value configured by the RNC in step 101, such as the SIR target value. If the measured value of the channel quality is smaller than the target value, it is determined to increase the transmit power of the reverse shared channel of the terminal; otherwise, it is determined to decrease the transmit power. Here, two thresholds may also be preset by the RNC, namely, the reverse direction is smaller than the threshold N11 and the reverse direction is greater than the threshold N12. If the measured value of the channel quality of the reverse shared channel is less than the first target value and reaches N11, then determine to increase the transmit power of the terminal reverse shared channel; if the measured value of the channel quality is greater than the first target value and reaches N12, Then determine to reduce the transmit power; and if the channel quality measurement value is smaller/greater than the first target value but does not reach N11/N12, then determine not to adjust the transmit power. The default values of N21 and N22 are 0.

In addition, RNC can also adjust the second target value and send it to Node B to update the target value. After determining to reduce or increase the transmit power of the reverse shared channel of the terminal, the Node B sends a command to reduce or increase the transmit power of the reverse shared channel to the terminal through the forward shared channel. Figure 1 shows the frame structure of the TD-SCDMA forward shared channel, which includes: data symbol, TFCI (Transport Format Combination Indicator, transmission format combination indicator) code word, training code, SS (Synchronization Symbol, synchronization symbol) symbol, TPC (Transmitter Power Control, transmit power control) symbols, TFCI codewords, data symbols and GP (Guard Period, guard interval), Node B sends power adjustment commands through the TPC symbols.

Step 104, the terminal receives a command to reduce or increase the transmit power of the reverse shared channel through the forward shared channel, and the terminal using the reverse shared channel adjusts its transmit power accordingly according to the command, while other terminals in the cell ignore the command . It should be noted that all terminals involved in a trunking service will receive the forward shared channel to receive the power adjustment command carried on it. However, since only one UE is using the reverse shared channel as the talker, the UE as the talker only needs to reduce or increase the transmit power of the reverse shared channel according to the command, while other terminals can ignore the command. Order.

So far, the control of the transmit power of the reverse shared channel is realized. Next, the control of the transmission power of the forward shared channel will be described with reference to FIG. 3 , and the control is mainly realized through the following four steps.

Step 201, the network side determines the channel quality target value of the forward shared channel, saves it and sends it to the terminal. When the RNC establishes the forward shared channel, it needs to configure the channel quality target value that needs to be achieved when the forward shared channel is received by the UE according to service requirements, that is, the third target value. The target value may be the SIR target value of the physical channel, the frame error rate (FER) of the physical frame, or the block error rate (BLER) or bit error rate (BER) of the transmission channel, etc. The RNC can configure the third target value according to the service. At this time, the third target value of all the cells under the jurisdiction of the RNC is the same, or the third target value can be configured according to the cell, and the RNC saves the configured third target value at the same time. Then, the RNC sends the configured target value to all UEs through the group broadcast channel in a group broadcast manner according to the cells. However, the initiator of the trunking service, that is, the calling party, may also send the third target value to it during the establishment of the group call.

Step 202, the network side determines the initial transmit power of the forward shared channel, and starts to transmit the forward shared channel with the initial transmit power. Specifically, the RNC determines the initial transmission power of the forward shared channel according to the third target value configured in step 201 and the current wireless environment and load, and sends it to the Node B; then, the Node B uses the received initial transmission power The power value transmits the forward shared channel.

Step 203, the terminal receives the forward shared channel and measures its channel quality, after that, the terminal can compare the measured value with the third target value to determine how to adjust the transmit power of the forward shared channel on the network side, and send to the network side A request to reduce or increase the transmit power of the forward shared channel; or, the terminal may also directly send the measured value to the network side for comparison and judgment by the network side.

Specifically, during the trunking service, after the UE receives the forward shared channel and measures its channel quality, the UE can compare the measured value with the third target value configured by the RNC, if the measured value of the channel quality is less than its target value And the forward direction is less than the threshold N21, indicating that the channel quality or service data quality is poor, and the UE sends a request to the RNC to increase the transmit power of the forward shared channel; if the measured value is greater than the target value and the forward direction is greater than the threshold N22, then Indicates that the channel quality or service data quality has met the requirements, and the UE sends a request to the RNC to reduce the transmit power of the forward shared channel, or does not send any forward shared channel power adjustment request to the RNC; and if the measured value is less than/greater than the target value but not up to N21/N22, the UE does not send any forward shared channel power adjustment request to the RNC.

Alternatively, the UE may send the measurements directly to the RNC. For example, the UE can regularly send the measurement value to the RNC according to a predetermined period; it can also compare the measurement value with the third target value, and if the absolute value of the difference between the two is greater than a first threshold, then send the measurement value to the RNC, otherwise No reporting; at this time, the RNC can also use the measurement control message to control the UE to report the measurement value through the measurement control process, and the measurement control message is also sent to all UEs through the cluster broadcast channel in the form of cluster broadcast.

In step 203, the period, the first threshold, the forward direction smaller than the threshold N21 and/or the forward direction greater than the threshold N22 are all configured by the RNC, and are sent to all UEs through the trunking broadcast channel in a trunking broadcast mode. However, for The initiator of the trunking service, that is, the calling party, may also send it to the UE during the group call establishment process. The default values of N21 and N22 are 0.

It should be noted that the UE can send forward shared channel transmit power adjustment (decrease or increase) request or forward the report message of the channel quality measurement value of the shared channel. In addition, when the terminal sends the above report message, it should at least include a cell identifier and/or a cluster service identifier.

Step 204: If the network side receives a power adjustment request, correspondingly reduce or increase the transmit power of the forward shared channel according to the request; or, if the network side receives a channel quality measurement value, then according to the measurement value and the third target value stored on the network side to determine how to adjust (decrease or increase) the transmit power of the forward shared channel. Here, when the RNC determines to reduce/increase the transmit power of the forward shared channel, it controls according to the cell and service.

For the first case, after receiving the request from the UE to increase the transmit power of the forward shared channel, the RNC sends a command to the Node B to increase the transmit power of the forward shared channel according to the cell ID and cluster service ID in the request message ; Node B increases the transmit power of the forward shared channel according to the command. It should be noted that this command can include a specific transmit power value, and the Node B will transmit the forward shared channel according to this power value at this time; The power increase step size sent to the Node B increases the transmit power. In addition, when receiving requests from multiple UEs to increase the transmit power of the forward shared channel at the same time, the RNC may increase the transmit power of the forward shared channel of these UEs according to the request with the largest increase.

Similarly, when receiving a request from the UE to reduce the transmit power of the forward shared channel, or the RNC does not receive any request to adjust the transmit power of the forward shared channel within the configured first time period, the RNC will use the cell identity and The trunking service identifier sends a command to the Node B to reduce the transmit power of the forward shared channel; and the Node B reduces the transmit power of the forward shared channel according to the command. It should be noted that this command can include a specific transmit power value, and the Node B will transmit the forward shared channel according to this value at this time; Decrease the power of the Node B by a step size to reduce the transmit power. In addition, when receiving requests from multiple UEs for reducing the transmit power of the reverse shared channel at the same time, the RNC may reduce the transmit power of the forward shared channel of these UEs according to the request with the largest reduction.

It should be noted that if the RNC does not receive any request to adjust the transmit power of the forward shared channel within the configured first time length, it may also not send any forward shared channel power adjustment command to the Node B according to the cell ID and the cluster service ID. For Node B, if it does not receive any command to increase and/or decrease the transmit power of the forward shared channel within the second time length configured by RNC, then the power reduction step is configured by RNC and sent to Node B Reduce the transmit power on the forward shared channel.

For the second case, after receiving the channel quality measurement value of the forward shared channel sent by the UE, the RNC compares the measurement value with the third target value stored by the RNC according to the cell ID and the cluster service ID in the message. If the measured value is less than the target value, it means that the channel quality or service data quality is poor, then the RNC sends a command to the Node B to increase the transmit power of the forward shared channel, and the Node B increases the transmit power of the forward shared channel according to the command. The command may or may not include a specific transmit power value. If included, the Node B transmits the forward shared channel according to the power value; if not included, the Node B increases the transmit power of the forward shared channel according to the power increase step size preconfigured by the RNC and sent to the Node B. If the RNC receives the forward shared channel quality measurement values sent by multiple UEs at the same time, and the measured values of multiple UEs are smaller than the target value, the RNC can increase the transmit power of the forward shared channel according to the one that needs to be increased the most.

Similarly, if the measured value is greater than the target value, it means that the channel quality has met the requirements, or the RNC has not received any forward shared channel quality measured value within the first time length of its configuration, then according to the cell identification and cluster service identification Send a command to reduce the transmit power of the forward shared channel to the Node B, and the Node B reduces the transmit power of the forward shared channel according to the command. The command may or may not include a specific transmit power value. If included, the Node B transmits the forward shared channel according to the power value; if not included, the Node B reduces the transmit power of the forward shared channel according to the power reduction step size pre-configured by the RNC and sent to the Node B. If the RNC receives the channel quality measurement values of the forward shared channel sent by multiple UEs at the same time, and the measured values of multiple UEs are greater than the target value, the RNC can reduce the channel quality of the forward shared channel according to the one that needs to be reduced the most. transmit power.

It should be noted that if the RNC does not receive any channel quality measurement value of the forward shared channel within its configured first time length, it may also not send any forward shared channel power adjustment command to the Node B according to the cell ID and the cluster service ID . For Node B, if it does not receive any command to increase and/or reduce the transmit power of the forward shared channel within the second time length configured by RNC, then follow the power reduction steps configured by RNC and sent to Node B Long reduce the transmit power of the forward shared channel.

In addition, the RNC may also determine whether to adopt the power control method of the above-mentioned forward shared channel according to the counted number of UEs participating in a trunk group call service in a cell. Specifically, the RNC presets a second threshold N, and counts the number M of UEs in the cell that send transmit power adjustment requests or channel quality measurement values of the forward shared channel to the RNC. If M≤N, the RNC uses the above method to control the transmit power of the forward shared channel of each UE in the cell; if M>N, the RNC does not perform power control on the forward shared channel of each UE in the cell, that is, the RNC The transmit power adjustment request message or the channel quality measurement value message of the forward shared channel received from the cell is not processed.

In this way, the control of the transmission power of the forward shared channel is realized. In addition, in the power control method of the forward/backward shared channel as mentioned above, the various parameters involved are preset by the RNC, such as the first/second threshold, period, first/second time length As well as power increase/decrease step size and thresholds N11/N12/N21/N22, etc., can be dynamically adjusted by the RNC.

It should be noted that although the present invention has been described through the above embodiments, the present invention can also have other various embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but these changes and modifications should belong to the appended claims of the present invention and their equivalents within the scope of protection.

Claims (22)

1. A power control method for a shared channel in a trunking communication system, the shared channel is located between a network side and a terminal, including a response sent to the network side by one of the terminals authorized by the network side as a speaker The forward shared channel and the forward shared channel sent to multiple terminals by the network side, the network side further includes a radio network controller and a node B, wherein the method includes: A reverse shared channel power control step, including: Step 11, the Node B receives the reverse shared channel sent by the terminal, and measures the channel quality of the reverse shared channel, so as to determine the power adjustment scheme of the reverse shared channel; and Step 12, the terminal correspondingly adjusts the transmit power of the reverse shared channel according to the power adjustment scheme in the step 11; and, A forward shared channel power control step, further comprising: Step 21, the terminal receives the forward shared channel sent by the Node B, and measures the channel quality of the forward shared channel, and the terminal and/or the radio network controller according to the forward shared channel The channel quality measurement determines a power adjustment scheme for the forward shared channel; and Step 22, the network side correspondingly adjusts the transmit power of the forward shared channel according to the power adjustment scheme in step 21. 2. The method according to claim 1, further comprising, before the step 11, the radio network controller configuring the first target value and the second target value of the reverse shared channel, and respectively sent to the Node B and the terminal. 3. The method according to claim 2, wherein the terminal determines the initial transmit power of the reverse shared channel according to the second target value, and transmits the reverse shared channel with the initial transmit power . 4. The method according to claim 2, wherein the step 11 comprises, the Node B comparing the channel quality measurement value of the reverse shared channel with the first target value, if the measurement If the value is greater than/less than the first target value and the reverse is greater than/less than the threshold, then a power decrease/increase command is sent to the terminal through the forward shared channel, wherein the reverse is greater than the threshold and/or Or the reverse direction is smaller than a threshold configured by the radio network controller and sent to the Node B. 5. The method according to claim 1, wherein the network side can establish the reverse shared channel for all the cells involved in the trunking service, or can only establish the reverse shared channel for the cell where the speaker is located. Reverse shared channel. 6. The method according to claim 1, wherein in the step 12, the terminal is further a terminal using the reverse shared channel. 7. The method according to claim 1, further comprising, before the step 21, the wireless network controller configures the third target value for the forward shared channel, saves it and sends it to the terminal. 8. The method according to claim 7, wherein the radio network controller determines the initial transmission power of the forward shared channel according to the third target value and sends it to the node B, and the node B transmits the forward shared channel to the terminal according to the initial transmit power. 9. The method according to claim 7, wherein the step 21 comprises, the terminal comparing the channel quality measurement value of the forward shared channel with the third target value, if the measurement value If it is less than the third target value and the forward direction is less than the threshold value, a power increase request is sent to the radio network controller; if it is greater than the third target value and the forward direction is greater than the threshold value, the The controller sends a power down request, or does not send any such power up/down requests. 10. The method according to claim 9, wherein the step 22 comprises, the radio network controller sending the node corresponding to the terminal according to the received power increase/decrease request B sends the power increase/decrease command of the forward shared channel. 11. The method according to claim 9, wherein said step 22 comprises, if said radio network controller does not receive any of said power increase/decrease requests within a first length of time, sending The Node B corresponding to the terminal sends a power reduction command of the forward shared channel, or does not send any command, wherein the first time length is set by the radio network controller. 12. The method according to claim 10 or 11, characterized in that, in the step 22, when receiving the power increase/decrease requests sent by multiple terminals at the same time, the wireless network The controller can process the request with the largest increase/decrease. 13. The method according to claim 7, wherein the step 21 comprises, the terminal sending the channel quality measurement value of the forward shared channel to the radio network controller. 14. The method according to claim 13, wherein the step 21 further comprises, the radio network controller comparing the channel quality measurement value of the forward shared channel with the third target value, if the If the measured value is less than/greater than the third target value and reaches the forward less than/greater than the threshold, then the power increase/decrease command of the forward shared channel is sent to the Node B corresponding to the terminal. 15. The method according to claim 13, wherein the step 21 further comprises, if the radio network controller does not receive any channel quality measurement value of the forward shared channel within the first time period , then send the power reduction command of the forward shared channel to the Node B corresponding to the terminal, or do not send any command, wherein the first time length is set by the radio network controller. 16. The method according to claim 14 or 15, characterized in that, in the step 21, when the channel quality measurement values of the forward shared channel sent by multiple terminals are received at the same time, the The radio network controller may process according to the one with the largest increase/decrease amount. 17. The method according to claim 10, 11, 14 or 15, wherein the step 22 further comprises, if the power increase/decrease of the forward shared channel sent by the radio network controller If the command includes a specific transmission power value, the Node B transmits the forward shared channel according to the specific transmission power value; if not included, the Node B transmits the forward shared channel according to the power configured and sent by the radio network controller Increase/decrease the step size to adjust the current transmit power of the forward shared channel accordingly. 18. The method according to claim 10, 11, 14 or 15, wherein if the Node B does not receive any power increase and/or decrease command of the forward shared channel within the second time length , then correspondingly reduce the transmit power of the forward shared channel according to the power reduction step size, wherein the second time length and the power reduction step size are set by the radio network controller and sent to the Node B. 19. The method according to claim 9 or 13, wherein the terminal sends the power increase/decrease request and/or the forward shared channel through the reverse shared channel or the reverse common channel. A channel quality measurement value of a channel, wherein the reverse common channel may include a random access channel and/or a physical random access channel. 20. The method according to claim 9 or 13, characterized in that in the power increase/decrease request of the forward shared channel and/or the report message of the channel quality measurement value of the forward shared channel , including at least a cell ID and/or a cluster service ID. 21. The method according to claim 13, wherein the terminal regularly sends the channel quality measurement value of the forward shared channel to the radio network controller in a predetermined period; or the terminal sends the measurement value Compared with the third target value, if the absolute value of the difference between the two is greater than the first threshold, then send it to the radio network controller; or the radio network controller uses a measurement control message to control the The terminal reports the measured value, wherein the predetermined period and/or the first threshold are set by the radio network controller. 22. The method according to claim 1, further comprising: the radio network controller setting a second threshold, and counting the number of terminals participating in a trunk group call service in a cell ; If the statistical result is less than or equal to the second threshold, then use the forward shared channel power control step; if it is greater than, then do not use the forward shared channel power control step.

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