CN102300291A - Method and system for scheduling uplink data - Google Patents

Abstract

The present invention discloses an uplink data scheduling method and system. The method includes: configuring an initial modulation and coding mode and an initial resource number of a terminal based on uplink power control; resources, and when resources remain, reduce the order of modulation and coding schemes of the terminal and allocate the remaining resources to the terminal according to preset principles. The present invention can improve resource utilization rate in resource-limited power control.

Description

A method and system for uplink data scheduling

technical field

The present invention relates to wireless communication, in particular to an uplink data scheduling method and system.

Background technique

In wireless communication, uplink power control and uplink data scheduling are two most important technologies in uplink communication. Among them, the uplink power control mainly completes the adjustment of terminal carrier transmit power, and at the same time needs to realize the reasonable control of uplink modulation and coding mode, and the uplink scheduling involves the amount of uplink data that can be allocated to the terminal.

There is a contradiction here: since the terminal has its own maximum transmit power, the carrier transmit power adjustment and the amount of uplink scheduling data of the terminal will be limited by the maximum transmit power, that is, it is impossible to adjust the carrier power and the amount of scheduling data to reach a very large .

The problems existing in the current uplink power control and uplink scheduling methods are:

1) The result of the final adjustment is that the carrier transmission power of the terminal is not improved, and the number of resources allocated by scheduling is reduced at the same time, resulting in a waste of the maximum transmission power capability of the terminal.

2) The result of the final adjustment is that the transmit power of the uplink carrier of the terminal increases, and at the same time, the number of resources allocated by scheduling increases, which causes the terminal to exceed the maximum transmit power capability and ultimately wastes precious air interface bandwidth resources.

3) The result of the final adjustment is that the transmission power of the uplink carrier of the terminal is increased, and at the same time, the number of resources allocated by scheduling is limited, and the ability of the terminal to control the transmission power not to exceed the maximum transmission power. However, when the base station still has resources available, this solution It will cause a waste of resources.

Among the above-mentioned methods, the third method is currently used more. This method is to increase the transmission power of the terminal carrier under the premise of a certain total transmission power through resource limitation, so as to ensure the purpose of uplink data transmission in the wireless system. . However, as mentioned earlier, this approach results in a waste of resources.

Contents of the invention

The main technical problem to be solved by the present invention is to provide an uplink data scheduling method and system, which can reduce the transmission power of the terminal and improve resource utilization.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A method for scheduling uplink data, comprising:

Configure the terminal's initial modulation and coding method and the initial number of resources based on uplink power control;

According to the initial number of resources and the resource application of the terminal, resources are pre-allocated for the terminal, and when resources remain, the order of the modulation and coding mode of the terminal is reduced according to a preset principle and the remaining resources are allocated to the terminal.

In an embodiment of the method of the present invention, when there are no resources left, the initial modulation and coding mode is maintained.

In an embodiment of the method of the present invention, pre-allocating resources for the terminal according to the initial number of resources and resource applications of the terminal includes: when the number of resource applications of the terminal is greater than the initial number of resources, pre-allocating resources for the terminal according to the initial number of resources Resources: When the number of resources requested by the terminal is less than or equal to the initial number of resources, resources are pre-allocated for the terminal according to the number of resources of the terminal.

In an embodiment of the method of the present invention, configuring the initial modulation and coding scheme and the number of initial resources of the terminal based on uplink power control includes: configuring the terminal with an initial modulation and coding as high as possible under the limit of the maximum transmit power of the terminal way, and allocate the corresponding initial resources for the terminal.

In an embodiment of the method of the present invention, reducing the order of the modulation and coding scheme of the terminal according to a preset principle and allocating the remaining resources to the terminal includes: maintaining or close to maintaining the initial uplink data throughput of the uplink power control configuration as In principle, the order of the modulation and coding mode of the terminal is reduced and the corresponding number of remaining resources is allocated to the terminal; the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding mode of the terminal.

In an embodiment of the method of the present invention, for multiple terminals, each terminal is polled and the order is reduced step by step, and the corresponding number of remaining resources is allocated to each terminal until the remaining resources are allocated or the modulation and coding of each terminal The mode order is reduced to the minimum.

In an embodiment of the method of the present invention, the modulation and coding scheme is a modulation scheme and a coding rate.

The present invention also provides an uplink data scheduling system, including:

An initialization module, configured to configure the terminal's initial modulation and coding scheme and the initial number of resources based on uplink power control;

The adjustment module is configured to pre-allocate resources for the terminal according to the initial number of resources and the resource application of the terminal, and when resources remain, reduce the order of modulation and coding schemes of the terminal according to preset principles and allocate the remaining resources to the terminal.

In an embodiment of the system of the present invention, the adjustment module adjusts the order of modulation and coding schemes in the following manner: on the principle of maintaining or close to maintaining the initial uplink data throughput of the uplink power control configuration, reduce the The order of the modulation and coding mode of the terminal and allocate the corresponding number of remaining resources to the terminal; the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding mode of the terminal.

In an embodiment of the system of the present invention, the adjustment module adjusts the order of the modulation and coding mode of multiple terminals in the following manner: poll each terminal and reduce the order step by step, and allocate the corresponding remaining resources The number is given to each terminal until the remaining resources are allocated or the order of modulation and coding schemes of each terminal is reduced to the minimum.

The uplink data scheduling of the present invention configures the terminal's initial modulation and coding method and the initial number of resources based on uplink power control, and then pre-allocates resources for the terminal. assigned to the terminal. In this way, resources can be fully allocated to terminals, resource utilization is improved, and transmission power of terminals is reduced by reducing the order of modulation and coding modes of terminals, thereby reducing power consumption.

Description of drawings

Fig. 1 is a flow chart of uplink scheduling in an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

The present invention relates to uplink data scheduling, which is mainly applied to resource-constrained uplink power control schemes, relates to wireless communication systems, under the spectrum resource-limited uplink power control schemes, and especially relates to the control of network resources that are not under optimal channel conditions. The terminal performs uplink data scheduling. The main idea of the invention is: configure the terminal's initial modulation and coding method and the initial resource number based on uplink power control; The order of the modulation and coding scheme of the terminal and the allocation of remaining resources to the terminal. When there is no resource left, the initial modulation and coding mode is maintained.

For some wireless systems, the resource concept is a two-dimensional combination of frequency and time. However, in this article, based on the unified treatment of time factors, the resources in this article mainly refer to spectrum resources; the restriction on resources refers to the restriction and allocation of frequencies. In the examples below, the number of resources is based on the number of carriers For example, that is, how many resources are allocated to the terminal refers to how many carriers are allocated to the terminal.

In the uplink data scheduling in the embodiment of the present invention, the following principles are mainly followed:

1) In the uplink power control, increase the transmit power of the uplink carrier of the terminal, increase the order of the modulation and coding mode that the terminal can use, and limit the number of resources scheduled and allocated under this modulation and coding mode. As mentioned above, the uplink power control mainly completes the adjustment of terminal carrier transmit power, and the total transmit power of the terminal (the product of the transmit power of each carrier of the terminal and the number of allocated carriers) should be limited below the maximum transmit power of the terminal. Here, the modulation and coding scheme based on the uplink power control configuration is called an initial modulation and coding scheme, the number of allocated resources is the initial resource number, and the uplink data throughput determined thereby is called the initial uplink data throughput.

The modulation and coding method mainly refers to the modulation method and coding rate. The modulation method includes, for example, 16QAM, 64QAM, QPSK or DQPSK, and the coding rate includes, for example, 1/2, 2/3, 3/4, 5/6, or 7/8, etc. . Different modulation and coding methods are combinations of different modulation methods and different coding rates. Different modulation and coding methods correspond to different unit transmit powers and different unit uplink data throughputs. Here, different modulation and coding schemes are distinguished according to their orders. Higher-order modulation and coding schemes have greater unit uplink data throughput and require higher transmit power accordingly. Therefore, when the transmission power of the terminal carrier is limited by the maximum transmission power, the number of allocated resources is correspondingly reduced for high-order modulation and coding schemes. For example, assume that the maximum transmit power of the terminal is 1w (watt); modulation and coding mode A, unit transmit power is 0.1w, unit uplink data throughput is 10Bits (bits); modulation and coding mode B, unit transmit power is 0.05w, unit The uplink data throughput is 5Bits (bits); if the terminal is configured with modulation and coding method A, the number of resources (carriers) allocated by it is at most 10, and its total transmission power is 0.1*10=1w, which does not exceed the terminal At this time, the uplink data throughput of the terminal is 10*10=100Bits; if the terminal is configured with modulation and coding mode B, the maximum number of resources (carriers) allocated to it is 20, and its total transmission power is 0.05*20=1w, which does not exceed the maximum transmit power of the terminal, and the uplink data throughput of the terminal at this time is 5*20=100Bits.

It should be noted that the above-mentioned power and unit uplink data throughput of the two modulation and coding methods are example values, and do not represent actual working values. Judging from the demodulation threshold of the current modulation and coding method, the unit uplink throughput The difference in the number of bits is 1 time, and the general demodulation threshold should be at least 4-5dB. Those skilled in the art know that 3dB is equivalent to a power difference of 1 times, and 4-5dB or more is equivalent to a power difference of about 3 times. Therefore, in actual work At this time, if according to the above example, the number of bits per unit uplink throughput is doubled (from 10Bits to 5Bits), the transmit power required by the carrier is far less than 0.5w. That is, under the condition of maintaining the same uplink data throughput, the transmission power of the carrier can be reduced by reducing the order of the modulation and coding mode, that is, the power consumption can be reduced.

In the embodiment of the present invention, when the uplink power control configures the initial modulation and coding mode of the terminal, the initial modulation and coding mode as high as possible is configured for the terminal under the limitation of the maximum transmission power of the terminal, and the initial resource number of the terminal is determined accordingly . That is, in this example, the initial modulation and coding mode is first configured for the terminal, thereby determining the terminal uplink carrier transmit power, then the initial resource number (terminal allocated carrier number) = maximum terminal transmit power/terminal uplink carrier transmit power.

2) Uplink scheduling adjusts the modulation and coding method and the number of resources allocated to the terminal. The principle of adjustment is:

a) The total transmit power of the control terminal cannot exceed the maximum transmit power capability of the terminal, and the average transmit power per unit uplink data throughput is reduced.

b) Reducing the order of modulation and coding schemes can increase the number of available resources, thereby increasing the actual transmission throughput.

c) Considering the number of resources applied by the terminal for uplink, if the number of resources applied by the terminal itself exceeds the number of resources allocated by the initial modulation and coding mode scheduling, and the base station has excess resources that can be used, use the principles of a and b above to allocate to the terminal Adjust the modulation and coding method and the number of resources.

d) Considering the number of resources applied by the terminal for uplink, if the number of resources applied by the terminal itself exceeds the number of resources allocated by the initial modulation and coding mode scheduling, and the base station has no redundant resources to use, then the initial modulation and coding mode and initial resources allocated to the terminal will not be corrected. The number is adjusted. In this case, it means that most terminals can use a higher-order modulation and coding method, which can increase the unit uplink data throughput, thereby increasing the total uplink data throughput of the base station.

Resource allocation involves allocating the initial number of resources during power control, and pre-allocating resources according to the terminal's application at the start of uplink scheduling. The pre-allocation of resources is limited by the number of initial resources, that is, when the number of applications for terminals exceeds the number of initial resources, at most the resources of the initial number of resources are allocated; when the number of applications for terminals does not exceed the number of initial resources, resources are allocated according to the number of applications to pre-allocate. For example, in uplink power control, after the maximum transmit power and the initial modulation and coding method are determined, the terminal can determine the initial number of resources accordingly, for example, 10 carriers. When the terminal applies for 20 carriers, the number of pre-allocated resources is 10, to prevent the transmission power from exceeding the maximum transmission power. When the terminal applies for, for example, 7 carriers, the number of pre-allocated resources is 7 to adapt to the number of resources required by the terminal.

As mentioned above, the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding method of the terminal. Therefore, the initial uplink data throughput of the uplink power control configuration can be maintained or close to the principle, and the modulation and coding method of the terminal The number is reduced to the corresponding order and the corresponding remaining resource number is allocated to the terminal. For example, the initial modulation and coding method is modulation and coding method A, its unit transmit power is 0.1w, and its unit uplink data throughput is 10Bits (bits); the number of resources (number of carriers) allocated by it is 10, and the terminal's initial Uplink data throughput is 10*10=100Bits. After resource pre-allocation, if there are remaining resources, the order of the modulation and coding scheme is reduced, and the corresponding remaining resources are allocated to the terminal.

For example, the remaining resources are 10 carriers. At this time, the order of the modulation and coding method can be reduced, and the unit uplink data throughput is correspondingly reduced. For example, a modulation and coding method with a unit uplink data throughput of 5 bits is selected to maintain or approach Keep the initial uplink data throughput of the uplink power control configuration, then all the remaining resources can be allocated to the terminal, and the number of resources allocated to the terminal is increased to 20, then the uplink data throughput is 20*5bits=100bits, so, it will be possible Maintain the initial uplink data throughput; of course, if there is no modulation and coding method with a unit uplink data throughput of 5 bits in the initially configured modulation and coding methods of each order, you need to select a modulation and coding method with a unit uplink data throughput close to 5 bits, At this point, the initial uplink data throughput will be nearly maintained. When the modulation and coding method includes multiple levels, the step-by-step reduction method is generally adopted, that is, the modulation and coding method is only reduced by one order during one adjustment, for example, the modulation and coding method with a unit uplink data throughput of 10 bits is reduced by one step, down to In the modulation and coding mode with a unit uplink data throughput of 8 bits, it is not necessary to allocate all 10 carriers of the remaining resources to the terminal, and only 2 to 3 redundant carriers can be allocated to the terminal accordingly.

For multiple terminals, the order of the modulation and coding schemes of each terminal can be reduced step by step according to the above-mentioned manner by using the polling method until the remaining resources are allocated or the order of the modulation and coding schemes of each terminal is reduced to the minimum.

An uplink data scheduling system according to an embodiment of the present invention includes:

An initialization module, configured to configure the terminal's initial modulation and coding scheme and the initial number of resources based on uplink power control;

The adjustment module is configured to pre-allocate resources for the terminal according to the initial number of resources and the resource application of the terminal, and when resources remain, reduce the order of modulation and coding schemes of the terminal according to preset principles and allocate the remaining resources to the terminal.

As shown in Figure 1, the main process of the uplink data scheduling in the embodiment of the present invention includes:

Step 1: Uplink power control increases the transmit power of the terminal carrier, and selects the corresponding modulation and coding method that does not exceed the maximum transmission power capability of the terminal, that is, the initial modulation and coding method, and the number of available resources, that is, the initial resource number. At this point, determine the initial uplink data throughput (the total uplink data throughput of a certain terminal under uplink power control) = unit uplink data throughput (one resource unit, in this example, refers to the uplink data throughput of a carrier, determined by the initial Modulation and coding method) * initial number of resources (in this example, the number of carriers), and the total carrier transmission power of the terminal (transmission power of each carrier * number of carriers, where the transmission power of each carrier is determined by the initial adjustment coding method) does not exceed the terminal Maximum transmit power. When selecting the initial modulation and coding method, the terminal is configured with an initial modulation and coding method as high as possible under the limitation of the maximum transmission power of the terminal. After the order of the initial modulation and coding method is determined, the initial resource number can be allocated to the terminal accordingly. In this example, as mentioned above, since the transmit power of each carrier * the number of carriers should not exceed the maximum transmit power of the terminal, after the initial modulation and coding mode is determined, the maximum number of carriers under the maximum transmit power limit (maximum resource number), the initial number of resources can be allocated as close as possible to this maximum number of resources.

Step 2: Uplink scheduling obtains terminal resource applications, polls all terminals, and pre-allocates resource scheduling. In this step, the pre-allocation of resource scheduling is limited by the number of initial resources in the previous step, that is, when the number of resources applied for by the terminal is less than or equal to the number of initial resources, resources are allocated to the terminal according to the number of resources applied for by the terminal; When the number of applied resources is greater than the initial number of resources, resources are allocated to the terminal according to the initial number of resources. Therefore, not only the actual needs of the terminal are considered, but also the maximum transmission power limit is avoided.

Step 3: Based on the above pre-allocation results, check whether the number of uplink resources is still available. If there are no remaining resources, skip to step 6.

Step 4: There are still remaining uplink resources, and the modulation and coding mode and the number of resources of a terminal are adjusted. When adjusting, it is to reduce the modulation and coding order of the terminal and allocate the remaining resources to the terminal according to the preset principles. The order of the mode and allocate the corresponding number of remaining resources to the terminal. As described in step 1, the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding scheme of the terminal. When the order of the modulation and coding scheme is reduced, more resources can be allocated to the terminal accordingly. Therefore, when adjusting, first reduce the modulation and coding order of the terminal, and the new modulation and coding method after the reduction determines the new unit uplink data throughput, then it can be obtained: new resource number = initial uplink data throughput / new Uplink data throughput per unit. Subtract the number of new resources from the number of resources already allocated to the terminal to obtain how many resources need to be allocated to the terminal from the remaining resources after the adjustment of the modulation and coding mode.

For multiple terminals, the adjustment is performed by polling each terminal. When the initially configured modulation and coding mode has multiple levels, a level-by-level reduction method is adopted, that is, in one round, the modulation and coding mode of the terminal is only reduced by one level. Assuming that the modulation and coding methods include high-order, middle-order, and low-order, when the first terminal is polled, first reduce its modulation and coding method from high-order to middle-order, on the basis of maintaining the uplink data throughput of the terminal as much as possible , allocating the corresponding number of remaining resources to the terminal. Then the next terminal is polled, and only one level is lowered, from the high level to the middle level, and the corresponding number of remaining resources is allocated to the terminal, and so on. If there are still remaining resources available after the end of this round, a new round will start, and the first terminal will be reduced from middle-level to low-level... .

Step 5: Determine whether all terminals are polled and adjusted to the lowest level, if yes, skip to step 6. If not, check whether the number of uplink resources is still available. If there are no remaining resources, skip to step 6; if there are still remaining resources available, poll other terminals and return to step 4. That is to say, the end condition of the adjustment process includes two conditions. One of the two conditions is satisfied, that is, the adjustment process is ended. Sufficient remaining resources), or the remaining resources are allocated (in this case, it means that the amount of remaining resources is not enough to support all terminals to be reduced to the lowest level).

Step 6: Perform uplink scheduling according to the final adjusted modulation and coding scheme and the number of resources. Or, after resource pre-allocation, it is found that there is no remaining resource, then maintain the initial modulation and coding mode, and do not perform resource adjustment.

The present invention is based on the premise of power control based on the third method, taking into account the terminal transmission power capability and the base station uplink resource number scheduling capability, to improve the base station uplink throughput as much as possible, by detecting the terminal's available transmission power vacancy capability, and the current uplink scheduling resources The number of resources and the modulation and coding mode of the terminal are adjusted in real time by using the situation, so that the resource utilization rate is improved under the resource-limited power control method.

The above content is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. A method for scheduling uplink data, comprising: Configure the terminal's initial modulation and coding method and the initial number of resources based on uplink power control; According to the initial number of resources and the resource application of the terminal, resources are pre-allocated for the terminal, and when resources remain, the order of the modulation and coding mode of the terminal is reduced according to a preset principle and the remaining resources are allocated to the terminal. 2. The method according to claim 1, wherein the initial modulation and coding scheme is maintained when there are no resources left. 3. The method according to claim 1, wherein pre-allocating resources for the terminal according to the initial number of resources and the resource application of the terminal comprises: when the number of resource applications of the terminal is greater than the initial number of resources, assigning the terminal according to the initial number of resources Pre-allocate resources; when the number of resources requested by the terminal is less than or equal to the initial number of resources, pre-allocate resources for the terminal according to the number of resources of the terminal. 4. The method according to claim 1, wherein configuring the initial modulation and coding scheme and the number of initial resources of the terminal based on the uplink power control comprises: under the limitation of the maximum transmit power of the terminal, configuring an initial resource as high as possible for the terminal Modulation and coding methods, and assign corresponding initial resource numbers to the terminal. 5. The method according to claim 1, wherein reducing the order of the modulation and coding scheme of the terminal according to a preset principle and allocating the remaining resources to the terminal comprises: maintaining or close to maintaining the initial uplink data throughput of the uplink power control configuration In principle, reduce the order of the modulation and coding scheme of the terminal and allocate the corresponding number of remaining resources to the terminal; the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding scheme of the terminal. 6. The method according to claim 5, wherein, for multiple terminals, each terminal is polled and the order is reduced step by step, and the corresponding number of remaining resources is allocated to each terminal until the remaining resources are allocated or the number of each terminal is The order of the modulation coding mode is reduced to the minimum. 7. The method according to any one of claims 1-6, wherein the modulation and coding scheme is a modulation scheme and a coding rate. 8. An uplink data scheduling system, comprising: An initialization module, configured to configure the terminal's initial modulation and coding scheme and the initial number of resources based on uplink power control; The adjustment module is configured to pre-allocate resources for the terminal according to the initial number of resources and the resource application of the terminal, and when resources remain, reduce the order of modulation and coding schemes of the terminal according to preset principles and allocate the remaining resources to the terminal. 9. The system according to claim 8, wherein the adjustment module adjusts the order of modulation and coding schemes in the following manner: on the principle of maintaining or close to maintaining the initial uplink data throughput of the uplink power control configuration, reducing the The order of the modulation and coding mode of the terminal and allocate the corresponding number of remaining resources to the terminal; the initial uplink data throughput is determined by the initial number of resources and the initial modulation and coding mode of the terminal. 10. The system according to claim 9, wherein the adjustment module adjusts the order of the modulation and coding mode for multiple terminals in the following manner: poll each terminal and reduce the order step by step, and assign the corresponding The remaining resources are assigned to each terminal until the remaining resources are allocated or the order of modulation and coding schemes of each terminal is reduced to the minimum.