WO2011157008A1

WO2011157008A1 - Method and base station for reducing forward transmission power in cluster system

Info

Publication number: WO2011157008A1
Application number: PCT/CN2010/077203
Authority: WO
Inventors: 侯晓霞
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-17
Filing date: 2010-09-21
Publication date: 2011-12-22
Also published as: CN101883414B; CN101883414A

Abstract

A method and base station for reducing forward transmission power in cluster system are provided in the present invention, wherein the method includes: determining whether the current channel is a speaking user channel (101); when the current channel is a non-speaking user channel, setting the backward power control bit gain value transmitted in the forward channel to zero (102). The present invention ensures that on the premise of the speaking user channel having backward power control, the power occupied by the backward power control bit in other forward channels is furthest reduced, the forward transmission power is saved and the system forward link capacity is increased. Furthermore, setting a buffer period with preset time when the backward power control gain value is switched can ensure that, when the terminal frequently switches in a switch region, the backward power control bit information can be received, even if the backward power control bit gain value of the forward channel has reduced to zero when the terminal switches back again, thus effectively ensuring the communication quality on the premise of saving the forward power.

Description

Method for reducing forward transmit power in a cluster system 1⁄2 station

The present invention relates to the field of communications, and in particular, to a method and a base station for reducing forward transmit power in a code division multiple address (CDMA) based cluster system. Background technique

In a CDMA cellular communication system, the system capacity is not only limited by the capacity of the reverse link, but also by the capacity of the forward link, which is particularly prominent in cluster systems. In a cluster system, since multiple terminals in a cluster group share the same forward voice channel, and the distribution of these terminals is unpredictable, the forward voice channel needs to cover the entire cell, compared to other traffic channels in the CDMA system. In other words, the transmit power required for the basic traffic channel of the forward voice channel is much larger. Therefore, in a clustered system, forward power resources appear to be invaluable.

In the prior art, the forward power of the cluster system includes the data stream occupation power transmitted by the forward channel and the transmission power occupied by the power control bits transmitted on the forward channel for controlling the reverse channel power. Normally, if the same gain is used, that is, the reverse power control bit gain (PCGAIN) is exactly the same as the data bit gain, the power consumption of the reverse power control bit is 1/12 of the data bit power occupancy. That is to say, the sum of the power consumption of the reverse power control bits transmitted every 12 forward channels is sufficient to maintain a normal forward traffic channel. In the voice system, the user does not talk all the time while talking, but has a certain silent period. During the silent period, the voice frame is transmitted at a rate of 1/8, and the actual power occupied by the data bits will be reduced. The power control bits are always present throughout the call, so the forward transmit power of the reverse power control bits will appear larger than the data bits.

With the expansion of the application scope of the cluster system, it is more and more common for a cluster call to be distributed under multiple sectors. Users in multiple sectors constantly apply for and release the right to speak. The location is also changing at any time, so in the cluster system, there is a pair of channels (uplink channel and downlink channel) allocated to the talk user under each sector. In fact, only the pair of channels of the cell in which the talk user is located needs to be in the forward channel. The reverse power control bit information is sent to occupy the forward transmission power. For those non-speech user channels in the idle state, since there is no voice of the terminal in the reverse direction, the power control bit information does not need to be transmitted, but the power control is always transmitted. The bit information greatly wastes the forward transmit power and reduces the forward link capacity of the system. Summary of the invention

The main object of the present invention is to provide a method and base station for reducing forward transmit power in a cluster system, aiming at reducing forward transmit power, thereby increasing the forward link capacity of the system.

The method for reducing forward transmit power in a cluster system proposed by the present invention includes the following steps:

Determining whether the current channel is a speaking user channel;

When the current channel is a non-speaking user channel, the reverse power control bit gain value sent on the forward channel is set to zero;

When the current channel is a talker user channel, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value.

Preferably, when the current channel is a non-speaking user channel, the step of setting the reverse power control bit gain value sent on the forward channel to zero includes:

When the current channel is a non-speaking user channel, the power control bit information is transmitted according to a predetermined reverse power control bit gain value within a predetermined time;

Determining whether the current channel becomes a talking user channel within a predetermined time;

The reverse power control bit gain value transmitted on the forward channel is set to zero when the current channel remains as a non-speaking user channel within a predetermined time; otherwise, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value.

Preferably, when the current channel is a talking user channel, according to a predetermined reverse power control The step of transmitting the power control bit information by the bit gain value includes:

When the current channel is a talking user channel, the power control bit information is transmitted according to a predetermined reverse power control bit gain value within a predetermined time;

Determining whether the current channel remains as a speaking user channel within a predetermined time;

Transmitting power control bit information according to a predetermined reverse power control bit gain value when the current channel remains as a talking user channel within a predetermined time, and repeating the above steps;

When the current channel becomes a non-speaking user channel within a predetermined time, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value for a predetermined time from the time of becoming the non-speaking user channel.

Preferably, the step of determining whether the current channel is a talking user channel comprises: determining whether the reverse service frame received by the base station is a non-deleted frame;

If the reverse traffic frame is a non-delete frame, the current channel is the talker channel; otherwise it is the non-talking user channel.

Preferably, the non-deleted frame comprises any one or two or more of 1/8 frame, 1/2 frame, 1/4 frame or full rate frame. The present invention further provides a base station for reducing forward transmit power in a cluster system, comprising: a determining module, configured to determine whether the current channel is a talking user channel;

a control module, configured to set a reverse power control bit gain value sent on the forward channel to zero when the current channel is a non-speaking user channel; and

When the current channel is a talker user channel, the power gain control bit information is transmitted according to a predetermined reverse power control bit gain value.

Preferably, the control module includes:

Transmitting unit, configured to: when the current channel is a non-speaking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

a second determining unit, configured to determine whether the current channel becomes a speaking user letter within a predetermined time a second control unit, configured to set a reverse power control bit gain value sent on the forward channel to zero when the current channel remains as a non-speaking user channel within a predetermined time; otherwise, the transmitting unit controls according to a predetermined reverse power The bit gain value transmits power control bit information.

Preferably, the sending unit is further configured to: when the current channel is a talking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time; the second determining unit is further configured to determine Whether the current channel remains as a talking user channel within a predetermined time;

The sending unit is further configured to: when the current channel remains as the speaking user channel for a predetermined time, transmit the power control bit information according to the predetermined reverse power control bit gain value; and, when the current channel becomes a non-speaking user within a predetermined time At the time of channel, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value for a predetermined time from the time of becoming the non-speaking user channel.

Preferably, the determining module is further configured to determine whether the received reverse service frame is a non-delete frame; if the reverse service frame is a non-delete frame, the current channel is a talk user channel; if the reverse service frame is a delete frame, Then the current channel is a non-speaking user channel.

Preferably, the non-deleted frame includes any one or two or more of 1/8 frame, 1/2 frame, 1/4 frame or full rate frame. The present invention relates to a method and a base station for reducing forward transmit power in a cluster system, by determining a selected talk user channel, transmitting power control bit information to a talk user channel according to a predetermined reverse power control bit gain value, and for a non-speech user The channel, the reverse power control bit gain value is set to zero, that is, the power control is turned off, and the unnecessary power control bits on the forward channel are eliminated, thereby ensuring that the talking user channel has the reverse power control, the maximum The limit reduces the power consumption of the reverse power control bits on other forward channels, achieving the purpose of saving forward transmit power to increase the system forward link capacity. In addition, when the power control gain value is switched A buffer period of a predetermined time is set to ensure that when the terminal frequently switches in the handover area, the reverse power control bit information is not received because the reverse power control bit gain value of the forward channel has been reduced to zero when the handover is returned. Therefore, the call quality is effectively guaranteed under the premise of saving forward power. DRAWINGS

1 is a schematic flow chart of an embodiment of a method for transmitting power forward in a cluster system according to the present invention;

2 is a schematic diagram showing the specific flow of step 101 in the method for forward transmission power of the cluster shown in FIG. 1;

FIG. 3 is a schematic diagram showing the specific flow of step 102 in the method for forward transmission power of the cluster shown in FIG. 1;

4 is a schematic diagram showing a specific process of step 103 in the method for forward transmission power of the cluster shown in FIG. 1;

5 is a schematic structural diagram of an embodiment of a base station for forward transmission power in a cluster system according to the present invention;

6 is a schematic diagram showing the specific structure of a control module in a base station of the forward transmission power shown in FIG. 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The solution of the embodiment of the present invention is mainly: transmitting a power control bit information according to a predetermined reverse power control bit gain value by judging a selected talk user channel, and inverting a non-speech user channel. The power control bit gain value is set to zero, that is, the power control is turned off, and the voice channel of the reverse power control bit of the other forward channel is minimized under the premise of the reverse power control, thereby achieving the saving forward direction. The purpose of sending power. As shown in FIG. 1, an embodiment of the present invention provides a method for reducing forward transmit power in a cluster system, including:

Step 101: Determine whether the current channel is a speaking user channel.

Step 102: When the current channel is a non-speaking user channel, set a reverse power control bit gain value sent on the forward channel to zero;

Step 103: When the current channel is a talking user channel, the power control bit information is sent according to a predetermined reverse power control bit gain value.

In this embodiment, the current channel is a channel for the user to talk, that is, a reverse channel corresponding to the forward channel, and the forward channel transmits power control bit information. In a trunking call, if the system establishes a shared channel of the cluster in multiple cells, then only the power control bit information needs to be sent on the forward channel corresponding to the cell where the talking user is located and the talking user channel, and the forward channel is used. The unnecessary power control bit is culled, that is, the reverse power control bit gain value of the forward channel of the cell where the non-speech user is located is set to zero, and the power control bit is not transmitted on the forward channel corresponding to the non-speaking user channel. information.

Therefore, when the base station transmits the forward power control bit information, it may firstly determine whether the current cell forward channel is a talking user channel, that is, whether there is a call user terminal, periodically or at a predetermined time. The judgment of the talking user channel can be judged by the base station bottom layer demodulation module receiving the reverse service frame of the talking user. If there is a good service frame, that is, a non-deleted frame, the channel can be considered as the talking user channel.

The judgment of the speaking user channel can also be determined by: determining, by the base station frame selection distribution module (SDM), whether the link corresponding to the reverse channel is a good frame link, and the forward channel corresponding to the link of the good frame is speaking. User channel, other channels are non-speaking user channels.

It is determined that if the current channel is a non-speaking user channel, the reverse power control bit gain value on the forward channel corresponding to the current channel is set to zero, that is, no power is transmitted on the forward channel corresponding to the current channel. Control bit information. For the speaking user channel, the power control bit information may be transmitted according to a predetermined reverse power control bit gain value on the forward channel corresponding to the current channel. For example, when it is determined that the current channel is a talking user channel, the power control bit gain (PCGAIN) value may be raised to a higher gain when the base channel corresponding to the link of the good frame is notified to the base station to write the frame, that is, speaking. The power control bit information is transmitted on the user's forward channel according to a predetermined reverse power control bit gain value. As shown in FIG. 2, in this embodiment, step 101 includes:

Step 1011: Determine whether the reverse service frame received by the base station is a non-delete frame.

Step 1012: If the reverse service frame is a non-delete frame, the current channel is a talking user channel; otherwise, it is a non-speaking user channel.

The non-deleted frame includes any one or two or more of 1/8 frame, 1/2 frame, 1/4 frame, or full rate frame. As shown in FIG. 3, step 102 includes:

Step 1021: When the current channel is a non-speaking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

Step 1022: Determine whether the current channel becomes a talking user channel within a predetermined time. Step 1023: Set the reverse power control bit gain value sent on the forward channel to zero when the current channel remains as a non-speaking user channel within a predetermined time. Otherwise, the power control bit information is transmitted in accordance with the predetermined reverse power control bit gain value.

In this embodiment, in order to ensure that the calling user terminal frequently switches between different cells, a normal call can be maintained, and when the reverse power control bit gain value is switched from zero to a predetermined value and a predetermined value to zero, one is set. The buffer period of the predetermined time, that is, a threshold for indicating the number of normal transmission powers, denoted by N, and when it is determined that the current channel is a non-speaking user channel, the bit gain is controlled according to a predetermined reverse power in N time. Value transmit power control bit letter If the current channel remains as a non-speaking user channel in N time, that is, if the frame received by the base station remains a bad frame (deleted frame), then the reverse transmission on the forward channel corresponding to the current channel is performed. The power control bit gain value is set to zero; otherwise, the power control bit information is transmitted according to a predetermined reverse power control bit gain value on the forward channel corresponding to the current channel, that is, the base station receives a good frame in the N time, and determines The current channel is changed from a non-speaking user channel to a speaking user channel. In this case, the current channel needs to be processed for the speaking user channel. Therefore, it is ensured that the terminal does not receive the reverse power control information when the switching area is frequently switched, because the power control bit gain of the channel has dropped to zero, and the call quality is effectively guaranteed under the premise of saving the forward power. This effectively ensures that the power control bits are transmitted with higher power when the terminal switches frequently. As shown in FIG. 4, in this embodiment, step 103 includes:

Step 1031: When the current channel is a talking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

Step 1032: Determine whether the current channel remains as the talking user channel in the predetermined time; Step 1033: When the current channel remains as the talking user channel within the predetermined time, send the power control bit information according to the predetermined reverse power control bit gain value, and enter Step 1032; otherwise, proceed to step 1034;

Step 1034: When the current channel becomes a non-speaking user channel within a predetermined time, the power control bit information is transmitted according to a predetermined reverse power control bit gain value within a predetermined time from the time of becoming the non-speaking user channel.

In this embodiment, it is determined that if the current channel is a talking user channel, the bit gain value, that is, the predetermined reverse power control bit gain value, is transmitted according to the normal reverse power on the forward channel corresponding to the current channel. Controlling the bit information, and keeping transmitting continuously for N time, wherein if a good frame is received at any time in the N time, that is, the current channel is still the talking user channel, then the time continues from the time when the new frame is newly received. Time, if a bad frame is received in the subsequent N time, that is, the current channel is changed from the talking user channel to the non-speaking user channel, Then, according to the non-speaking user channel condition, if it is determined in the N time that the current channel is a non-speaking user channel, the reverse power control bit gain value on the forward channel corresponding to the current channel is set to zero, that is, the forward channel The reverse power control bit power on is reduced to zero. The reason why the switching of the reverse power control bit gain value is set to a buffer period of N time is because, for the current channel determined to be the speaking user channel, the probability that the calling user terminal switches back after switching out is large, therefore, When the current channel is changed from the talking user channel to the non-speaking user channel, it remains as the predetermined reverse power control bit gain value and maintains a period of N time, even if the current channel is judged to be a non-talking user channel, Maintaining a high reverse power control bit gain value ensures that when the calling user terminal frequently switches in the handover cell, the power control bit of the corresponding channel has a higher transmission power, so that the calling user terminal is in a single cell or a handover cell, The normal call can be maintained, so as to avoid that the reverse power control bit gain value transmitted by the base station cannot improve the reverse power control failure in time due to frequent switching of the calling user terminal during the handover of the cell, thereby affecting the call quality.

As described above, after performing step 1034, the embodiment needs to go to step 1022 to determine whether the current channel becomes a talking user channel within a predetermined time; when the current channel remains as a non-speaking user channel within a predetermined time, the current channel is used. The reverse power control bit gain value on the corresponding forward channel is set to zero; otherwise, the power control bit information is transmitted according to a predetermined reverse power control bit gain value on the forward channel corresponding to the current channel.

In the embodiment of the present invention, by selecting a speaking user channel, the power channel control bit information is transmitted according to a predetermined reverse power control bit gain value for the forward channel corresponding to the speaking user channel, and the forward channel corresponding to the non-speech user channel is The reverse power control bit gain value is set to zero, that is, the power control is turned off, and the unnecessary power control bits on the forward channel are eliminated, thereby ensuring that the speaking user channel has the minimum reduction under the premise of reverse power control. The reverse power control bits on the other forward channels occupy power, achieving the purpose of saving forward transmit power to increase the system forward link capacity. In addition, there is a pre-set when the reverse power control gain value is switched. The buffering period of the fixed time ensures that when the terminal frequently switches in the handover area, the reverse power control bit information is not received due to the reverse power control bit gain value of the forward channel when the handover is returned, thereby Under the premise of saving forward power, the call quality is effectively guaranteed. As shown in FIG. 5, an embodiment of the present invention provides a base station for reducing forward transmit power in a cluster system, including:

a determining module 601, configured to determine whether the current channel is a talking user channel;

The control module 602 is configured to set the reverse power control bit gain value sent on the forward channel to zero when the current channel is a non-speaking user channel.

In this embodiment, the control module 602 is further configured to: when the current channel is a talking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value.

In this embodiment, the determining module 602 is further configured to determine whether the received reverse service frame is a non-delete frame; if the reverse service frame is a non-delete frame, the current channel is a talking user channel; otherwise, the non-speaking user channel. As shown in FIG. 6, the control module 602 includes:

The sending unit 6021 is configured to: when the current channel is a non-speaking user channel, send power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

The second determining unit 6022 is configured to determine whether the current channel becomes a talking user channel within a predetermined time;

a second control unit 6023, configured to set a reverse power control bit gain value sent on the forward channel to zero when the current channel remains as a non-speaking user channel within a predetermined time; otherwise, the transmitting unit according to the predetermined reverse power The control bit gain value transmits power control bit information.

In this embodiment, the sending unit 6021 is further configured to: when the current channel is a speaking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time; the second determining unit 6022 is further configured to determine Whether the current channel remains talking during the scheduled time User channel

The sending unit 6021 is further configured to: when the current channel remains as the speaking user channel in the predetermined time, transmit the power control bit information according to the predetermined reverse power control bit gain value;

When the current channel becomes a non-speaking user channel within a predetermined time, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value for a predetermined time from the time of becoming the non-speaking user channel. In this embodiment, when the base station sends the forward power control bit information, the first determining module

601 determines whether the current cell forward channel is a speaking user channel, that is, whether there is a calling user terminal. The judgment of the speaking user channel can be judged by the base station bottom layer demodulation module receiving the reverse service frame of the speaking user. If there is a good service frame, that is, a non-deleted frame, the channel can be considered as a speaking user channel.

It is determined that if the current channel is a non-speaking user channel, the control module 602 sets the reverse power control bit gain value on the forward channel corresponding to the current channel to zero, that is, on the forward channel corresponding to the current channel. The power control bit information is not transmitted.

It is determined that if the current channel is a talking user channel, the transmitting unit 6021 in the control module 602 controls the bit gain value according to the normal reverse power on the forward channel corresponding to the talking user channel, that is, according to the predetermined reverse power control. The bit gain value transmits power control bit information, and is continuously transmitted in N time, wherein, at any time in the N time, if a good frame is received, that is, the current channel is still a talking user channel, the new frame is received. The time continues for N times. If a bad frame is received in the subsequent N time, that is, the current channel is changed from the talking user channel to the non-speaking user channel, it is processed according to the non-speaking user channel condition, if the second time is the second time. The determining unit 6022 determines that the current channel is a non-speaking user channel, and the second control unit 6023 sets the reverse power control bit gain value on the forward channel corresponding to the current channel to zero, that is, reduces the reverse power control bit power on the forward channel corresponding to the current channel to zero. The reason why the switching of the reverse power control bit gain value is set to a buffer period of N time is because, for the current channel determined to be the speaking user channel, the probability that the calling user terminal switches back after switching out is large, therefore, When the current channel is changed from the talking user channel to the non-speaking user channel, the predetermined reverse power control bit gain value remains on the corresponding forward channel and maintains a period of N time, even in the N time, even if the current channel is judged For the non-speaking user channel, the high power control bit gain value is also maintained, ensuring that when the calling user terminal frequently switches in the handover cell, the power control bit of the corresponding channel has a higher transmission power, so that the calling user terminal is in a single cell. If the cell is switched, the normal call can be maintained, so that the reverse power control bit gain value transmitted by the base station cannot be increased in time due to the frequent handover of the calling user terminal during the handover of the cell, thereby affecting the call quality.

In the embodiment of the present invention, by selecting a speaking user channel, the power control bit information is transmitted according to a predetermined reverse power control bit gain value on the forward channel corresponding to the speaking user channel, and the non-speaking user channel is forwarded correspondingly. The reverse power control bit gain value on the channel is set to zero, that is, the power control is turned off, and the unnecessary power control bits on the forward channel are eliminated, thereby ensuring that the talking user channel has the reverse power control and maximizes The reverse power control bit occupation power of other forward channels is reduced, and the purpose of saving forward transmission power to increase the system forward link capacity is achieved. In addition, when the power control gain value is switched, a buffer period of a predetermined time is set to ensure that when the terminal frequently switches in the handover area, the power control bit gain value of the channel does not fall to zero when the handover is returned. The bit information is controlled to the power, thereby effectively ensuring the call quality while saving the forward power.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and equivalent structural or process changes made by the present specification and the drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

Claim

A method for reducing forward transmit power in a cluster system, comprising:

Determining whether the current channel is a speaking user channel;

2. The method according to claim 1, wherein, when the current channel is a non-speaking user channel, the step of setting a reverse power control bit gain value sent on the forward channel to zero comprises: the current channel is non-speaking Transmitting power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

3. The method according to claim 1, wherein, when the current channel is a talking user channel, the step of transmitting power control bit information according to a predetermined reverse power control bit gain value comprises:

Transmitting power control bit information according to a predetermined reverse power control bit gain value when the current channel remains as a talking user channel within a predetermined time, and repeating the above steps; When the current channel becomes a non-speaking user channel within a predetermined time, the power control bit information is transmitted in accordance with a predetermined reverse power control bit gain value for a predetermined time from the time of becoming the non-speaking user channel.

The method according to any one of claims 1 to 3, wherein the step of determining whether the current channel is a talking user channel comprises:

Determining whether the reverse service frame received by the base station is a non-delete frame;

5. The method according to claim 4, wherein the non-deleted frame comprises any one or two or more of 1/8 frame, 1/2 frame, 1/4 frame or full rate frame.

6. A base station for reducing forward transmit power in a cluster system, comprising:

a determining module, configured to determine whether the current channel is a speaking user channel;

The base station according to claim 6, wherein the control module comprises:

a second determining unit, configured to determine whether the current channel becomes a talking user channel within a predetermined time;

a second control unit configured to maintain the current channel as a non-speaking user channel for a predetermined time The reverse power control bit gain value transmitted on the forward channel is set to zero; otherwise, the transmission unit transmits the power control bit information according to the predetermined reverse power control bit gain value.

8. The base station according to claim 7, wherein

The sending unit is further configured to: when the current channel is a talking user channel, transmit power control bit information according to a predetermined reverse power control bit gain value within a predetermined time;

The second determining unit is further configured to determine whether the current channel remains as a talker user channel within a predetermined time;

The base station according to any one of claims 6 to 8, wherein the determining module is further configured to determine whether the received reverse traffic frame is a non-delete frame; if the reverse traffic frame is a non-delete frame, the current channel is a speaking User channel; If the reverse traffic frame is a delete frame, the current channel is a non-speaking user channel.

10. The base station according to claim 9, wherein the non-deleted frame comprises any one or two or more of a 1/8 frame, a 1/2 frame, a 1/4 frame, or a full rate frame.