CN101801024B - Forward supplemental channel rate assignment method and forward supplemental channel rate assignment device - Google Patents

Abstract

The invention discloses a forward supplementary channel rate assignment method and device. The above method includes: when the terminal is in the current wireless state to establish a forward supplementary channel, obtain the highest rate that can be assigned; obtain the initial transmission power required to establish the forward supplementary channel with the highest rate; determine the fan power corresponding to the highest rate Whether the difference between the admission threshold and the current occupied power of the carrier sector is greater than or equal to the initial transmit power, where the corresponding carrier sector power admission threshold is set for different rates in advance; if not, reduce the highest rate until the rate assignment is successful . According to the technical scheme provided by the invention, the rate distribution of the F-SCH can be balanced with efficiency and fairness, and the overload situation of the carrier sector can be alleviated.

Description

Forward Supplementary Channel Rate Assignment Method and Device

technical field

The present invention relates to the communication field, in particular, to a forward supplementary channel rate assignment method and device. the

Background technique

The high-speed packet data service provided by the Code Division Multiple Access (CDMA) 2000 base station system is carried over the air by a Supplemental Channel (SCH). The SCH from the base station to the mobile station is Forward Supplementary Channel (F-SCH). Since the F-SCH requires greater transmission power than the basic channel carrying voice services, the increase in transmission power will cause overload of the radio frequency system. And under the same wireless environment, higher rate F-SCH requires higher transmission power. Therefore, when the F-SCH is established, it is very important to assign an appropriate rate to prevent the overload of the radio frequency system caused by the forward power increase and to stabilize the system performance. the

In Patent No. 200710001071.3 "A Method of Forward Channel Rate Assignment", step 7 in the claims describes (judging whether the remaining power headroom of the carrier sector can support the forward supplementary channel to transmit at the initial transmission power determined in step 6) , if not, lower the rate of the forward supplementary channel by one level, and continue to step 6, otherwise, assign the rate and initial transmit power to the forward supplementary channel, and the assignment process ends), wherein the remaining power headroom of the above-mentioned carrier sector Subtract the current occupied sector power from the sector power threshold allowed to establish the F-SCH. That is, before the power occupied by the carrier sector reaches the threshold value for allowing the establishment of F-SCH, any rate of F-SCH can be established as long as it meets the requirements of the carrier sector power threshold, that is, users with good wireless conditions are more likely to be assigned high-rate F-SCH F-SCH. Under the load condition of the carrier sector at this time, assigning a high-rate F-SCH will quickly exhaust the power margin of the carrier sector, causing the carrier sector to enter the overload state more easily, triggering the overload control action of the base station system, and affecting user access Or the quality of an already established business. Under the carrier sector where voice service and data service exist at the same time, the access and switching of the voice service should be guaranteed first when the carrier sector is critically overloaded. Therefore, the above implementation method has obvious disadvantages and deficiencies in some scenarios. the

To solve the problem described above, when the F-SCH is assigned at a rate, different carrier sector power admission thresholds may be used for different rates. That is, when the load of the bearer sector is low, a higher-rate F-SCH is allowed to be established. As the load of the bearer sector increases, the rate of the F-SCH allowed to be established decreases. -sch build. Different rate F-SCHs use different power access thresholds of the carrier sector to optimize the F-SCH rate distribution, give priority to voice services in specific scenarios, and avoid overloading the carrier sector. the

Contents of the invention

Aiming at the problem in the related art that when assigning the forward channel rate, assigning a high-rate F-SCH will quickly exhaust the power margin of the carrier fan, causing the carrier fan to enter the overload state more easily, the present invention provides a forward supplementary channel A rate assignment method and device to solve at least one of the above problems. the

According to one aspect of the present invention, a forward supplementary channel rate assignment method is provided. the

The forward supplementary channel rate assignment method according to the present invention includes: when the terminal is in the current wireless condition to establish the forward supplementary channel, obtain the highest rate that can be assigned; obtain the initial transmission required to establish the highest rate forward supplementary channel Power; determine whether the difference between the maximum rate corresponding to the carrier sector power access threshold value and the current carrier sector occupied power is greater than or equal to the initial transmit power, wherein the corresponding carrier sector power access threshold value is set for different rates in advance; if not , then reduce the maximum rate until the rate assignment succeeds. the

According to another aspect of the present invention, a forward supplementary channel rate assignment device is provided. the

The forward supplementary channel rate assignment device according to the present invention includes: a first acquisition unit, used to determine the highest rate that can be assigned when the terminal is in the current wireless condition to establish a forward supplementary channel; a second acquisition unit, used to Obtain the initial transmission power required to establish the forward supplementary channel of the highest rate; the determination unit is used to determine whether the difference between the maximum rate corresponding to the carrier sector power admission threshold value and the current carrier sector occupied power is greater than or equal to the initial transmit power, where , pre-set the corresponding fan power admission threshold for different rates; the processing unit is used to reduce the highest rate until the rate assignment is successful when the output of the determination unit is negative. the

Through the present invention, when assigning the rate of the forward supplementary channel, different power access thresholds of the carrier sector are used for different rates, which solves the problem of assigning a high-rate F-SCH when assigning the rate of the forward channel in the related art. The power margin of the carrier fan will be exhausted soon, which will cause the carrier fan to enter the overload state more easily. When the carrier fan is under different load conditions, the F-SCH rate distribution can take into account both efficiency and fairness, and can alleviate the load. fan overload condition. the

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the flowchart of the supplementary channel assignment method according to the embodiment of the present invention;

Fig. 2 is a flow chart of the supplementary channel assignment method according to a preferred embodiment of the present invention;

Fig. 3 is a structural block diagram of a supplementary channel assignment device according to an embodiment of the present invention;

Fig. 4 is a structural block diagram of a supplementary channel assignment device according to a preferred embodiment of the present invention. the

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. the

Fig. 1 is a flowchart of a supplementary channel assignment method according to an embodiment of the present invention. As shown in Figure 1, the supplementary channel assignment method according to the embodiment of the present invention includes the following processing (step S101-step S107):

Step S101: When the terminal is in the current wireless state to establish a forward supplementary channel, obtain the highest rate that can be assigned;

Step S103: Obtain the initial transmit power required to establish the highest rate forward supplementary channel;

Step S105: Determine whether the difference between the maximum rate corresponding to the carrier sector power access threshold and the current carrier sector occupied power is greater than or equal to the initial transmit power, wherein the corresponding carrier sector power access thresholds are set for different rates in advance;

Step S107: If not, reduce the maximum rate until the rate assignment is successful. the

In the above method, different fan power access thresholds are provided for different rates of F-SCH, so that when the carrier fan is under different load conditions, the rate distribution of the F-SCH can take into account both efficiency and fairness, and can alleviate the overload situation of the carrier fan . the

Preferably, the above step S101 may further include the following processing:

1. Calculate the transmit power required for the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition;

In the specific implementation process, the above step 1 may further include the following processing:

(1) After the basic channel is established, obtain the instantaneous transmit power of the basic channel according to a predetermined time interval;

(2) Weighted and summed the power value obtained each time and the latest power value saved to obtain the transmit power of the basic channel;

(3) According to the transmit power of the basic channel, the transmit power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition is obtained through calculation. the

The specific calculation process is as follows: the rate of the forward supplementary channel, the value of the wireless configuration of the forward supplementary channel and the forward basic channel, the coding method of the forward basic channel, the number of base stations participating in the handover of the forward basic channel and the forward supplementary The four parameter values of the current frame error rate of the channel are corrected, and the corrected value is summed with the current transmit power of the forward basic channel to determine the transmit power of the forward supplementary channel at each rate. the

Since the basic channel transmit power of the terminal at each moment is discretely distributed within a certain range, the above processing avoids inaccurate subsequent calculations caused by instantaneous changes in the basic channel power. the

2. The transmission power is compared with the upper limit of transmission power corresponding to each predetermined rate configured in advance, and the highest rate that can be assigned is determined. the

In the specific implementation process, the rate is generally predetermined into several levels, and the rate of each level corresponds to a different transmission power upper limit. For example, after calculating the transmit power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition, the transmit power corresponding to the highest level predetermined rate obtained through the above calculation can be compared with the highest level predetermined rate first. Compared with the transmission power upper limit corresponding to the rate of the highest level, if the former is smaller than the latter, the predetermined rate of the highest level is the highest rate that can be assigned currently. If the former is greater than the latter, then follow the above procedure to compare the transmission power corresponding to the second highest rate with the upper limit of the transmission power, and so on to obtain the highest rate that can be assigned. the

In the specific implementation process, in step S103, the initial transmission power can be obtained by the following calculation:

The value of the transmit power of the user basic channel is summed with the correction value of the F-SCH corresponding to the rate of the system configuration and the correction value corresponding to the number of base stations participating in the handover of the forward basic channel to obtain the F-SCH transmit power of the corresponding rate. Since the correction value corresponding to each rate of the system configuration can be configured, the establishment of a certain rate F-SCH can be controlled (the larger the correction value configuration, the easier it is to slow down). the

Preferably, the above step S107 may further include the following processing:

1. Decrease the level of the highest speed step by step;

2. For each downgraded rate, obtain the transmit power required to establish the forward supplementary channel of the rate;

3. Determine whether the difference between the carrier sector power access threshold corresponding to the rate and the current carrier sector occupied power is greater than or equal to the transmit power required to establish the forward supplementary channel of the rate;

4. If yes, determine that the rate assignment is successful. the

It can be obtained from this that when the F-SCH is assigned at a rate, different rates use different carrier sector power admission thresholds. That is, when the power of the carrier sector is low, a higher-rate F-SCH is allowed to be established. As the carrier power increases, the rate of the F-SCH that is allowed to be established decreases, until the carrier load reaches a certain level, and the F-SCH is no longer allowed Sch build. the

Preferably, if it is determined that the difference between the carrier sector power admission threshold value corresponding to the predetermined minimum rate and the current carrier sector occupied power is less than the transmit power required to establish the forward supplementary channel of the lowest rate, the following processing may also be included: determine The transmission power of the current bearer sector is insufficient, and the rate assignment is stopped. the

Fig. 2 is a flowchart of a supplementary channel assignment method according to a preferred embodiment of the present invention. As shown in Figure 2, for the CDMA2000 base station system that uses the present invention to carry out forward supplementary channel rate assignment, the process includes the following processing (step S201-step S215):

Step S201: Using the wireless configuration of F-SCH, the wireless configuration of the basic channel, the coding method of the basic channel, the number of switching base stations on the basic channel, and the F-SCH frame error rate, the correction value is summed with the power of the basic channel to obtain an estimate F-SCH transmit power of each rate. the

Step S203: Comparing the estimated F-SCH transmission power of each rate with the configured upper limit of F-SCH of each rate, to obtain the maximum allowed F-SCH rate. the

Step S205: Calculate the transmit power occupied by the current carrier sector. the

Step S207: Subtract the transmit power of the current bearer sector from the F-SCH power admission thresholds of each rate to obtain the power headroom corresponding to each rate of F-SCH. the

Step S209: Determine whether the currently expected assigned F-SCH rate is lower than the lowest rate that can be assigned. If yes, the rate assignment fails because the transmit power of the current carrier sector is insufficient. Otherwise, execute step S211. the

Step S211: Estimate the transmission power of the desired rate F-SCH from the basic channel power. the

Step S213: Determine whether the power headroom corresponding to the expected rate F-SCH meets the transmission power requirements, and assign the F-SCH rate and initial transmission power to the user. If the power headroom corresponding to the expected rate F-SCH does not meet the transmission power requirements, slow down Level one, continue to execute step S211, otherwise, execute step S215. the

Step S215: Assign rate and initial transmit power for F-SCH. the

Through this embodiment, when the base station system (for example: CDMA2000) assigns the F-SCH rate and transmission power for the user's data service, the F-SCH corresponding to different rates uses different carrier sector power access thresholds and F-SCH transmission The power threshold improves the rate distribution of the F-SCH under different load levels of the carrier fan, and alleviates the power overload of the carrier fan caused by the F-SCH. the

Fig. 3 is a structural block diagram of an apparatus for assigning supplementary channels according to an embodiment of the present invention. As shown in FIG. 3 , the supplementary channel assignment device according to the embodiment of the present invention includes: a first obtaining unit 1 , a second obtaining unit 2 , a determining unit 3 and a processing unit 4 . the

The first acquisition unit 1 is used to determine the highest rate that can be assigned when the terminal is in the current wireless state to establish a forward supplementary channel;

The second obtaining unit 2 is used to obtain the initial transmission power required to establish the forward supplementary channel of the highest rate;

The determination unit 3 is used to determine whether the difference between the maximum rate corresponding to the carrier sector power admission threshold value and the current carrier sector occupied power is greater than or equal to the initial transmission power, wherein the corresponding carrier sector power admission threshold is set in advance for different rates value;

The processing unit 4 is configured to reduce the highest rate until the rate assignment is successful when the output of the determining unit is negative. the

When the device performs rate assignment for the F-SCH, it uses different carrier sector power admission thresholds for different rates. Therefore, when the load of the bearer sector is different, the rate distribution of the F-SCH can take into account both efficiency and fairness, and alleviate the overload situation of the bearer sector. the

Preferably, as shown in Figure 4, the first acquisition unit 1 may further include: a calculation module 10, which is used to calculate the transmission power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition; the comparison module 12, used The highest rate that can be assigned is determined by comparing the transmit power with the preconfigured upper limit of transmit power corresponding to each predetermined rate. the

Preferably, as shown in FIG. 4 , the calculation module 10 may further include: an acquisition submodule 100, configured to acquire the instantaneous transmit power of the fundamental channel at predetermined time intervals after the fundamental channel is established; a weighted summation unit 102, configured to The power value obtained each time and the latest power value stored are weighted and summed to obtain the transmission power of the basic channel; the calculation sub-module 104 is used to establish each predetermined rate under the current wireless condition of the terminal according to the transmission power of the basic channel through calculation The transmit power required for the forward supplementary channel. the

Preferably, as shown in FIG. 4 , the processing unit 4 may further include: a processing module 40, configured to lower the level of the highest rate step by step; an acquisition module 42, configured to obtain and establish the rate for each degraded rate The transmit power required for the forward supplementary channel; the judging module 44, used to judge whether the difference between the carrier sector power admission threshold value corresponding to the rate output by the processing module and the current carrier sector occupied power is greater than or equal to the forward channel for establishing the rate The transmit power required by the supplementary channel; a determining module 46, configured to determine that the rate assignment is successful when the output of the judging module is yes. the

Preferably, the processing unit 4 is further configured to determine that the difference between the power admission threshold value of the carrier sector corresponding to the predetermined minimum rate and the occupied power of the current carrier sector is less than the transmit power required to establish the forward supplementary channel of the lowest rate The transmission power of the current carrier sector is insufficient, and the rate assignment is stopped (that is, the establishment of the F-SCH is no longer allowed). the

The working modes of each unit, each module, and each sub-module in the above-mentioned device combined with each other can refer to the description in FIG. 1 and FIG. 2 , and will not be repeated here. the

When the device is used to assign F-SCH rate and transmission power to the user's data service in the base station system (for example: CDMA2000), corresponding to different rates of F-SCH, different carrier sector power access thresholds and F-SCH transmission power thresholds are used , which improves the F-SCH rate distribution of the carrier fan under different load levels, and alleviates the power overload of the carrier fan caused by the F-SCH. the

To sum up, with the help of the above-mentioned embodiments provided by the present invention, F-SCHs with different rates use different power access thresholds of bearer sectors to optimize F-SCH rate distribution, give priority to voice services in specific scenarios, and avoid bearer sector overload. Purpose. Moreover, when estimating the F-SCH transmission power through the transmission power of the user's basic channel, the statistical average value is used instead of the instantaneous sampling value, which avoids the estimated interference caused by the user's short-term wireless environment deterioration. the

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (10)

1. A forward supplementary channel rate assignment method, characterized in that the method comprises: When the terminal is in the current wireless state to establish a forward supplementary channel, obtain the highest rate that can be assigned; Obtain the initial transmit power required to establish the highest rate forward supplementary channel; Determine whether the difference between the carrier sector power admission threshold value corresponding to the highest rate and the current carrier sector occupied power is greater than or equal to the initial transmit power, wherein the corresponding carrier sector power admission threshold value is set for different rates in advance; If not, reduce the maximum rate until the rate assignment is successful. 2. The method according to claim 1, wherein when the terminal is in the current wireless condition and establishes a forward supplementary channel, obtaining the highest rate that can be assigned comprises: Calculate the transmission power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition; The transmission power is compared with the pre-configured transmission power upper limit corresponding to each predetermined rate, and the highest rate that can be assigned is determined. 3. The method according to claim 2, wherein the calculation of the required transmission power for establishing each predetermined rate forward supplementary channel under the current wireless condition of the terminal comprises: After the basic channel is established, acquire the instantaneous transmission power of the basic channel according to a predetermined time interval; weighted summation of the power value obtained each time and the latest saved power value to obtain the transmit power of the basic channel; According to the transmit power of the basic channel, the transmit power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition is obtained through calculation. 4. The method according to any one of claims 1 to 3, wherein reducing the highest rate until rate assignment is successful comprises: Decrease the level of the highest rate step by step; For each downgraded rate, obtain the transmit power required to establish the forward supplementary channel of the rate; Judging whether the difference between the carrier sector power admission threshold value corresponding to the rate and the current carrier sector occupied power is greater than or equal to the transmission power required to establish the forward supplementary channel of the rate; If yes, it is determined that the rate assignment is successful. 5. The method according to claim 4, wherein, if it is determined that the difference between the power admission threshold value of the carrier sector corresponding to the predetermined minimum rate and the current occupied power of the carrier sector is less than the forward supplementary channel set up at the lowest rate When the transmission power required, the method also includes: Determine that the transmit power of the current carrier sector is insufficient, and stop rate assignment. 6. A forward supplementary channel rate assignment device, characterized in that the device comprises: The first obtaining unit is used to determine the highest rate that can be assigned when the terminal is in the current wireless state to establish a forward supplementary channel; The second acquiring unit is configured to acquire the initial transmit power required to establish the forward supplementary channel of the highest rate; A determining unit, configured to determine whether the difference between the admission threshold value of the carrier sector power corresponding to the highest rate and the current carrier sector occupied power is greater than or equal to the initial transmission power, wherein the corresponding carrier sector power is set in advance for different rates entry threshold; A processing unit, configured to reduce the maximum rate until the rate assignment is successful when the output of the determining unit is negative. 7. The device according to claim 6, wherein the first acquiring unit comprises: A calculation module, configured to calculate the transmission power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition; A comparing module, configured to compare the transmission power with the pre-configured transmission power upper limit corresponding to each predetermined rate, and determine the highest rate that can be assigned. 8. The device according to claim 7, wherein the calculation module comprises: The obtaining submodule is used to obtain the instantaneous transmission power of the basic channel according to a predetermined time interval after the basic channel is established; A weighted summation unit, configured to perform weighted summation of the power value obtained each time and the latest stored power value to obtain the transmit power of the basic channel; The calculation sub-module is used to obtain the transmission power required by the terminal to establish each predetermined rate forward supplementary channel under the current wireless condition according to the transmission power of the basic channel. 9. The device according to any one of claims 6 to 8, wherein the processing unit comprises: A processing module, configured to gradually reduce the level of the highest rate; An obtaining module, configured to obtain, for each downgraded rate, the transmit power required to establish a forward supplementary channel of the rate; A judging module, configured to judge whether the difference between the carrier sector power admission threshold value corresponding to the rate output by the processing module and the current carrier sector occupied power is greater than or equal to the transmit power required to establish the forward supplementary channel at the rate; A determining module, configured to determine that the rate assignment is successful when the output of the judging module is yes. 10. The apparatus of claim 9, wherein: The processing unit is further configured to determine that when the difference between the access threshold value of the carrier sector power corresponding to the predetermined minimum rate and the current carrier sector occupied power is less than the transmission power required to establish the forward supplementary channel of the lowest rate The transmission power of the current bearer sector is insufficient, and the rate assignment is stopped.

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