CN101562466B - System and method for improving reverse data rate - Google Patents
System and method for improving reverse data rate Download PDFInfo
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- CN101562466B CN101562466B CN 200810089065 CN200810089065A CN101562466B CN 101562466 B CN101562466 B CN 101562466B CN 200810089065 CN200810089065 CN 200810089065 CN 200810089065 A CN200810089065 A CN 200810089065A CN 101562466 B CN101562466 B CN 101562466B
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Abstract
The invention discloses a system and method for improving the reverse data rate, belonging to the CDMA wireless communication system. In the method, after determining that a cell has the narrow-band interference, the base station calculates the cell interference level value and carries out the interference suppression operation of the users of the cell and then determines the power gain value of areverse supplementation channel corresponding to a reverse pilot channel and sends the power gain value to a mobile station; the mobile station determines the transmission power of the reverse supple mentation channel according to the received power gain value and finally improves the reverse data rate. Under the condition of the mobile station having the interference, the invention guarantees that the transmission rate of reverse high speed data is not influenced during the power control of the mobile station, and finally guarantees the signal-to-noise ratio of the base station in the operation of demodulating high speed data.
Description
Technical Field
The present invention relates to a system and method for improving reverse data rate, and more particularly, to a system and method for improving reverse data rate in a CDMA wireless communication system.
Background
Currently, in a CDMA wireless communication system, when there is narrowband interference, the transmission power of a reverse mobile station is significantly increased, and the capacity of a cell is reduced, while the rate of reverse high-speed data is rapidly decreased.
The reverse traffic channel of the CDMA system includes: a reverse pilot channel, a reverse fundamental channel, and a reverse supplemental channel, wherein the reverse supplemental channel is used for transmitting reverse high-speed data, and the transmission rate can reach up to 307.2 kbps. In order TO ensure that the base station can correctly demodulate the signal of the reverse high-speed data, a reverse supplemental channel carrying the high-speed data needs TO reach a signal-TO-noise ratio Eb/Nt required by the base station, which requires that the rate of the reverse high-speed data is high, that is, the transmission power of the reverse supplemental channel is high, and the transmission power of the reverse supplemental channel is determined according TO the transmission power of a reverse PILOT channel, the power GAIN of the reverse supplemental channel relative TO the reverse PILOT channel is generally RL _ ATT _ ADJ _ GAIN _ TO _ PILOT, and the unit is db, and the power GAIN value needs TO take different values for different data transmission rates.
When reverse narrow-band interference exists in the CDMA system, the mobile station still transmits signals according to the transmitting power in the ideal state, at the moment, the noise becomes large, so that Eb/Nt is obviously reduced, and according to the closed-loop power, the mobile station increases the transmitting power until the frame error rate of a reverse basic channel reaches about 1 percent of the target. However, in general, during the power increase of the reverse fundamental channel, the difference between the transmission powers of the reverse PILOT channel and the reverse supplemental channel will remain fixed, which may cause the power GAIN value RL _ ATT _ ADJ _ GAIN _ TO _ PILOT of the reverse supplemental channel relative TO the reverse PILOT channel TO fail, and finally the transmission rate of the reverse high-speed data is decreased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a system and a method for increasing reverse data rate, so as to ensure that the transmission rate of reverse high-speed data is not affected by the power control of a mobile station when the mobile station has reverse narrowband interference.
In order to solve the above problems, the present invention provides a method for improving reverse data rate, a base station calculates a cell interference level value after determining that a cell has narrowband interference, performs interference suppression operation on a user in the cell, then determines a power gain value of a reverse supplemental channel relative to a reverse pilot channel, and sends the power gain value to a mobile station;
the mobile station determines the transmitting power of the reverse supplementary channel according to the received power gain value, and finally improves the reverse data rate.
Further, the method specifically comprises the following steps:
(a) after obtaining the total power value received by a cell, a base station converts data users in a reverse supplemental channel into equivalent online voice user numbers, accumulates the online voice users, calculates the average receiving power value of all the online voice users, determines that narrowband interference exists in the cell if the average receiving power value is larger than an interference judgment threshold value preset in the base station, and stores the difference value of the average receiving power value and the interference judgment threshold value as an interference level value of the cell;
(b) the base station starts an interference suppression function to eliminate partial narrow-band interference;
(c) the base station determines the power gain value of the reverse supplementary channel relative to the reverse pilot channel according to the cell interference level value and the reverse supplementary channel rate assigned by the system, and informs the mobile station of the power gain value;
(d) and after obtaining the power gain value of the reverse supplemental channel relative to the reverse pilot channel, the mobile station calculates the transmitting power of the reverse supplemental channel and transmits data according to the determined transmitting power.
Further, in the step (a), the base station determines that the cell has narrowband interference only when the average received power value is greater than an interference judgment threshold value preset in the base station for N consecutive times, where N is an integer;
the base station calculates the difference between the average receiving power value of N times and the interference judgment threshold value, and takes the average value of the difference as the interference level value; or taking the difference value between the average receiving power value obtained by the Nth calculation and the interference judgment threshold value as the interference level value.
Wherein the value range of N is as follows: n is more than or equal to 3 and less than or equal to 8.
Further, in the step (c), the base station informs the mobile station of the newly determined power gain value of the reverse supplemental channel relative to the reverse pilot channel through a power control message during the call setup.
Further, in the above method, after the interference suppression operation is performed by the base station, the search window of the reverse pilot channel is adjusted to compensate for the delay generated by the interference suppression function.
The present invention also provides a system for increasing reverse data rate, comprising: the system comprises a communication control module, a transmitting receiver and a special signaling processing module which are respectively connected with the communication control module, wherein the transmitting receiver is connected with a mobile station; wherein,
the communication control module is used for acquiring a cell receiving total power value from the transceiver, determining whether the cell has narrowband interference according to the cell receiving total power value and the number of online voice users, and when the cell has narrowband interference, calculating a cell interference level value and transmitting the interference level value to the special signaling processing module;
the transceiver is used for acquiring a total power value received by a cell, transmitting the received total power value to the communication control module, and performing interference suppression operation on the cell;
the special signaling processing module is used for determining the power gain value of the reverse supplemental channel relative to the reverse pilot channel and sending the power gain value to the mobile station.
Further, in the above system, the communication control module is configured to convert the data users in the reverse supplemental channel into equivalent online voice user numbers after receiving the total power value received by the cell, accumulate the online voice users, calculate an average received power value of all online voice users, and determine that narrowband interference exists in the cell if the average received power value is greater than an interference determination threshold value preset in the base station;
the cell interference level value is a difference value between the average receiving power value and the interference judgment threshold value.
Further, in the above system, the communication control module is configured to convert the data users in the reverse supplemental channel into equivalent online voice user numbers after receiving the total power value received by the cell, accumulate the online voice users, calculate an average received power value of all online voice users, and determine that narrowband interference exists in the cell if the average received power value is greater than an interference determination threshold value preset in the base station for N times;
the communication control module calculates a difference value between the average receiving power value of N times and an interference judgment threshold value, and takes the average value of the difference value as the interference level value; or taking the difference value between the average receiving power value obtained by the Nth calculation and the interference judgment threshold value as the interference level value.
Further, in the above system, the dedicated signaling processing module determines the power gain value of the reverse supplemental channel relative to the reverse pilot channel according to the cell interference level value and the reverse supplemental channel rate assigned by the system.
Further, the system further comprises a channel unit module connected to the communication control module, and the channel unit module compensates a delay generated when the transceiver suppresses interference by adjusting a search window of a reverse pilot channel.
The technical scheme of the invention improves the power of the reverse supplemental channel by improving the relative gain of the reverse supplemental channel under the condition that the mobile station has interference, thereby ensuring that the transmission rate of reverse high-speed data is not influenced in the process of power control of the mobile station and finally ensuring the signal-to-noise ratio required in the operation of demodulating the high-speed data by the base station.
Drawings
FIG. 1 is a diagram illustrating an exemplary system for detecting narrowband interference to increase reverse data rate;
fig. 2 is a flow chart of detecting narrowband interference to increase reverse data rate in an embodiment.
Detailed Description
The main idea of the present invention is that CDMA is a self-interfering system, so that the interference of each mobile station comes from all other mobile stations and the interference outside the system, and when there is a narrowband interference situation, the transmit power of each mobile station increases significantly, and the average received power per user measured by the base station also increases. Based on this principle, the base station starts interference suppression operation by detecting narrowband interference, and notifies the dedicated signaling processing module to adjust the relative gain of the data channel, thereby increasing the rate of reverse high-speed data. In the specific process, whether the cell has narrowband interference can be judged by detecting the total power value received in the reverse direction of the cell and the number of online users, when the cell does have narrowband interference, the base station can determine the GAIN value RL _ ATT _ ADJ _ GAIN _ TO _ PILOT of the reverse supplemental channel according TO the interference level of the cell and the assigned data rate, and finally the transmission power of the mobile station on the reverse supplemental channel is improved, so that the rate of reverse data is improved.
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
A system for improving reverse data rate, which is applied to a CDMA system and has a structure as shown in fig. 1, and comprises a base station and a mobile station, wherein the base station further comprises a Communication Control Module (CCM), and a Transceiver (TRX), a channel element module (CHM) and a dedicated signaling processing module (DSMP) respectively connected to the CCM, wherein the TRX is further connected to the mobile station, and each function module has the following functions:
CCM, which is used to accumulate online voice and/or data users and convert the data users of reverse supplemental channel according to the prior art, for example, 16X supplemental channel is converted into 16 voice users, so as to convert the number of data users into the equivalent number of online voice users, then the average receiving power value of all online voice users is calculated according to the total power value received by the cell sent by TRX, then it is judged whether the average power value is continuously greater than the interference judgment threshold value for N times, if yes, it is determined that the cell has narrowband interference, otherwise, it is determined that the cell does not have narrowband interference, when the cell has narrowband interference, the module is also used to calculate the cell interference level value and send the interference level value to the special signaling processing module;
the TRX is used for periodically measuring the reverse received total power value of the cell, and when narrow-band interference exists, the TRX starts an interference suppression function according to the control of the CCM and partially eliminates the narrow-band interference;
CHM, is used for adjusting the search window to the reverse pilot channel according to CCM's control, in order to adapt to the reverse time delay brought by interference suppression function of TRX;
and the DSMP determines a Power GAIN value RL _ ATT _ ADJ _ GAIN _ TO _ PILOT of the reverse supplemental channel relative TO the reverse PILOT channel according TO the cell interference level value and the assigned reverse supplemental channel rate under the Control of the CCM, and informs the mobile station of a new Power GAIN value of the reverse supplemental channel relative TO the reverse PILOT channel through a Power Control Message (Power Control Message) in the call establishment process.
When the mobile station is a mobile terminal in the above system, the process of increasing the reverse data rate in the process of initiating a call by the mobile terminal is shown in fig. 2, and includes the following steps:
step 201: a transmitter-receiver (TRX) of the CDMA wireless base station measures the received total power value of a cell and reports the total power value to a Communication Control Module (CCM) of the base station;
in this step, the TRX may periodically measure the total received power value of the cell, and the measurement period is once per minute in this embodiment. Wherein the unit of the received total power value is dbm.
Step 202: after CCM receives the total received power value of the tested cell, converting the data users in the reverse supplemental channel into equivalent online voice user number, then accumulating the online voice users and calculating the average received power value of all the online voice users;
step 203: CCM judges whether the average receiving power value is greater than the interference judgment threshold value set in advance in the base station for N times, if yes, step 204 is carried out, otherwise, step 201 is returned;
in this step, if CCM judges that the average received power value is greater than an interference judgment threshold value preset by the base station N consecutive times, it is determined that narrowband interference exists in the cell, at this time, CCM calculates a difference value between the average received power value N times and the interference judgment threshold value, and stores an average value of the difference value as the interference level value; or the difference value between the average receiving power value obtained by the Nth calculation and the interference judgment threshold value is used as the interference level value to be stored, wherein the CCM continuously carries out judgment for N times so as to avoid misjudgment, and N is preferably more than or equal to 3 and less than or equal to 8; certainly, in other embodiments, in this step, the CCM may also determine whether the average received power value is greater than an interference determination threshold value preset in the base station, and if so, determine that the cell has narrowband interference, at this time, the CCM calculates a difference between the average received power value and the interference determination threshold value, and stores the difference as the interference level value.
Step 204: CCM informs TRX to start interference suppression function, TRX detects narrow-band interference value, and partial eliminates narrow-band interference;
step 205: CCM informs a channel element module (CHM) to adjust a search window;
in this step, considering the interference suppression function of the TRX, a signal needs to be processed, which may cause a delay of the signal, so that the CHM adjusts the search window of the reverse pilot channel to adapt to the delay caused by the interference suppression function, but in other embodiments, this step may be omitted, that is, the step 204 is executed and then the step 206 is directly executed.
Step 206: CCM sends message to inform special signal process module (DSMP) the interference level value of the subzone;
in this step, the interference level value of the cell is the difference between the average receiving power value of each voice user and the interference judgment threshold value stored in step 203.
Step 207: the DSMP determines a GAIN value RL _ ATT _ ADJ _ GAIN _ TO _ PILOT of a reverse supplemental channel relative TO a reverse PILOT channel according TO the interference level value and the reverse supplemental channel rate assigned by the system;
in this step, the DSMP may search a power gain value and interference level value table in the base station according to the interference level and the reverse supplemental channel rate assigned by the system, where the table includes information such as an interference threshold value, a radio parameter, a reverse supplemental channel rate, and the like, where the radio parameter includes RC3 and RC4, that is, a modulation mode of a physical layer; and the rate of the reverse supplemental channel ranges from 19.2kbps to 307.2 kbps.
Step 208: in the call establishment process, the DSMP informs the terminal to set the Power gain value of the newly determined reverse supplemental channel relative to the reverse pilot channel through a Power control message (Power control message);
step 209: after the terminal obtains the power gain value, the transmitting power of the reverse supplementary channel is recalculated by the power gain value according to the prior art, and the data is transmitted according to the determined transmitting power, so that the signal-to-noise ratio required by the demodulation of the base station is ensured, and the speed of the reverse high-speed data is improved.
It can be seen from the above embodiments that, in the presence of interference, the technical solution of the present invention properly increases the power of the reverse supplemental channel, which can increase the reverse high-speed data rate, thereby ensuring the signal-to-noise ratio required by the base station for demodulation.
Of course, the foregoing detailed description is only a preferred embodiment provided for convenience in understanding the present invention, and is not to be construed as limiting the present invention, so that all technical solutions covered by the claims of the present invention are set forth in the claims of the present invention.
Claims (9)
1. A method for increasing a reverse data rate,
after obtaining the total power value received by a cell, a base station converts data users in a reverse supplemental channel into equivalent online voice user numbers, accumulates the online voice users, calculates the average receiving power value of all the online voice users, determines that narrowband interference exists in the cell if the average receiving power value is larger than an interference judgment threshold value preset in the base station, and stores the difference value of the average receiving power value and the interference judgment threshold value as an interference level value of the cell;
the base station carries out interference suppression operation on the cell user, then determines the power gain value of the reverse supplemental channel relative to the reverse pilot channel according to the cell interference level value and the reverse supplemental channel rate assigned by the system, and sends the power gain value to the mobile station;
the mobile station determines the transmitting power of the reverse supplementary channel according to the received power gain value, and finally improves the reverse data rate.
2. The method of claim 1, wherein the method further comprises the steps of:
(a) the base station starts an interference suppression function to eliminate partial narrow-band interference;
(b) and after obtaining the power gain value of the reverse supplemental channel relative to the reverse pilot channel, the mobile station calculates the transmitting power of the reverse supplemental channel and transmits data according to the determined transmitting power.
3. The method of claim 1,
when the average receiving power value is continuously greater than an interference judgment threshold value preset in the base station for N times, the base station determines that the cell has narrowband interference, wherein N is an integer;
the base station calculates the difference between the average receiving power value of N times and the interference judgment threshold value, and takes the average value of the difference as the interference level value; or taking the difference value between the average receiving power value obtained by the Nth calculation and the interference judgment threshold value as the interference level value.
4. The method of claim 3, wherein the range of values of N is: n is more than or equal to 3 and less than or equal to 8.
5. The method of claim 1,
and the base station informs the mobile station of the newly determined power gain value of the reverse supplemental channel relative to the reverse pilot channel through a power control message in the call establishment process.
6. The method of claim 1 or 2,
and after the base station carries out interference suppression operation, adjusting a search window of a reverse pilot channel to compensate the time delay generated by the interference suppression function.
7. A system for increasing a reverse data rate, the system comprising: the system comprises a communication control module, a transceiver and a special signaling processing module which are respectively connected with the communication control module, wherein the transceiver is connected with a mobile station; wherein,
the communication control module is configured to obtain a total receiving power value of a cell from the transceiver, convert a data user in a reverse supplemental channel into an equivalent number of online voice users, accumulate the online voice users, calculate an average receiving power value of all the online voice users, determine that narrowband interference exists in the cell if the average receiving power value is greater than an interference determination threshold value preset in a base station, and when narrowband interference exists in the cell, calculate a cell interference level value and send the interference level value to the dedicated signaling processing module, where the cell interference level value is a difference value between the average receiving power value and the interference determination threshold value;
the transceiver is used for acquiring a total power value received by a cell, transmitting the received total power value to the communication control module, and performing interference suppression operation on the cell;
the special signaling processing module is used for determining the power gain value of the reverse supplemental channel relative to the reverse pilot channel according to the cell interference level value and the reverse supplemental channel rate assigned by the system, and sending the power gain value to the mobile station.
8. The system of claim 7,
the communication control module is used for determining that the cell has narrowband interference if the average receiving power value is greater than an interference judgment threshold value preset in the base station for N times;
the communication control module calculates a difference value between the average receiving power value of N times and an interference judgment threshold value, and takes the average value of the difference value as the interference level value; or taking the difference value between the average receiving power value obtained by the Nth calculation and the interference judgment threshold value as the interference level value.
9. The system of claim 7 or 8,
the system further comprises a channel unit module connected with the communication control module, and the channel unit module compensates the time delay generated when the transmitter and the receiver restrain the interference by adjusting the search window of the reverse pilot frequency channel.
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| CN 200810089065 CN101562466B (en) | 2008-04-15 | 2008-04-15 | System and method for improving reverse data rate |
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| CN 200810089065 CN101562466B (en) | 2008-04-15 | 2008-04-15 | System and method for improving reverse data rate |
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| CN101562466B true CN101562466B (en) | 2013-05-08 |
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| CN102711133B (en) * | 2012-05-31 | 2015-01-28 | 中兴通讯股份有限公司 | Control method, control device and network accessing equipment |
| CN104066105B (en) * | 2013-03-21 | 2018-04-10 | 华为技术有限公司 | Disturbance restraining method, macro base station, micro-base station and system |
| US20160088573A1 (en) * | 2014-09-24 | 2016-03-24 | Intel Corporation | Power adaption and randomization for interference cancelation and mitigation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394020A (en) * | 2001-06-27 | 2003-01-29 | 华为技术有限公司 | Speed control method by dynamic regulation of threshold for CDMA system |
| CN101146350A (en) * | 2006-12-22 | 2008-03-19 | 中兴通讯股份有限公司 | A system for improving non dispatched reverse supplementary channel rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1394020A (en) * | 2001-06-27 | 2003-01-29 | 华为技术有限公司 | Speed control method by dynamic regulation of threshold for CDMA system |
| CN101146350A (en) * | 2006-12-22 | 2008-03-19 | 中兴通讯股份有限公司 | A system for improving non dispatched reverse supplementary channel rate |
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