CN101005326A - Up reasource distributing method and radio communication system - Google Patents

Abstract

The present invention discloses a method for allocating uplink resources. The method includes: the system assigns, according to the channel quality conditions of the scheduled users, for each user who is scheduled to send data in the currently scheduled transmission time unit. Broadband pilot resources; and set a special transmission time unit, in which the measurement pilot resources are allocated for unscheduled users. The invention also discloses a wireless communication system. In the present invention, through the above scheme, users who are not scheduled in normal scheduling can have more opportunities to send measurement pilots, thereby allocating measurement pilot resources to more users, so that they can participate in uplink scheduling; In addition, in the present invention, after the pilot resources are allocated to the users who transmit data in the transmission time unit, these users are no longer allocated measurement pilot resources in the same transmission time unit, thereby ensuring the low peak-to-average ratio of the single carrier. characteristics.

Description

A method for allocating uplink resources and a wireless communication system

technical field

The present invention relates to the technical field of wireless communication information transmission, in particular to an uplink resource allocation method and a wireless communication system.

Background technique

The traditional single-carrier technology has the characteristics of low peak-to-average ratio (PAPR) of the transmitted waveform, so that the amplifier device of the terminal equipment can work in a small linear range, thereby saving power consumption and reducing the cost of the terminal, but its multiplexing The method is not flexible enough. Orthogonal Frequency Division Multiple Access (OFDM) technology has the characteristics of flexible multiplexing, and can resist multipath interference, and is widely used in many communication systems, but one of its unavoidable problems is that its signals have high PAPR, which limits the application of OFDM technology in the uplink of wireless communication systems.

At present, an emerging single-carrier frequency division multiple access (SC-FDMA) technology integrates the above two technologies, and through the processing of time domain symbols -> frequency domain sample point mapping -> time domain waveforms, so that The system not only maintains the characteristics of single carrier but also can carry out convenient and flexible frequency division multiplexing. As shown in Figure 1, it is a schematic diagram of the main technology of SC-FDMA, wherein first, the time-domain signal shown in 101 is transformed into the frequency domain through Fourier transform (DFT) 102, and then sub-carrier mapping (Sub-carrierMapping) is performed in the frequency domain 103. Map the frequency-domain signal to the corresponding subcarrier, and then convert it to the time domain through inverse Fourier transform (IFFT) 104, and then at 105, add the cyclic prefix CP to the time-domain signal and send it.

In the uplink direction, the above subcarrier mapping steps in SC-FDMA and the subcarrier mapping steps included in other FDMA technologies (such as OFDM technology, etc.) determine the frequency band occupied by the user. As shown in Figure 2, it is a schematic diagram of subcarrier mapping. Figure 2a shows that the sample points are mapped to a certain frequency domain, and the remaining subcarrier positions are added with 0, while Figure 2b shows that the sample points are scattered on the subcarriers. , that is, (L-1) zeros are inserted between every two samples. When L=1, the sample points output by DFT are mapped to continuous subcarriers, which is called localized FDMA; when L>1, it is mapped to equally spaced subcarriers, called distributedFDMA, usually also called comb spectrum transfer method. Such a position where a user maps a sample point is a position where other users add 0, so that each user maintains orthogonality in the frequency domain. These two methods can ensure that the peak-to-average ratio of the transmission waveform is low, thereby improving the efficiency of the terminal power amplifier.

In the current wireless communication system, the receiver needs to know the corresponding channel information to demodulate the data, and the channel compensation can effectively improve the receiving performance by using equalization and other methods. This is usually done by sending a reference signal known by the receiver. And the receiving end performs channel estimation according to the signal. In a multi-user system, the wireless channel path experienced by each user is different, so the fading of each channel is also different, so that the current user has better transmission performance in some transmission frequency bands, but in some frequency bands Possibly deep decline. From the point of view of the system, in order to maximize the system capacity and throughput, the transmission differences between different users can be fully utilized, which is usually called multi-user diversity. The multi-user diversity system guarantees the maximum system capacity and throughput by utilizing the differences of users in terms of time and frequency through an effective scheduling algorithm, and configures different time and frequency band resources for different users to make better use of their transmission. time-frequency resources. In the uplink, in order to reliably demodulate user data and make full use of multi-user diversity, the receiving end of the base station needs to know the channel information on the user’s transmission frequency band and the channel quality on the full frequency band, so as to correctly demodulate the data and provide effective allocation of resources to users.

In addition, an uplink subframe structure as shown in Figure 3, which includes two pilot symbols (P1, P2), used to transmit reference signals, that is, as pilots for coherent demodulation, and data symbols (Data) , for control/data transfer. Generally, in order to track the channel time-varying characteristics of some users, such as users whose moving speed is greater than 120km/h, etc., based on such a subframe structure, if the system needs to know the channel quality information of users on resources other than the time-frequency resources for transmitting data , in the case of not increasing the extra pilot overhead of the system, but also to ensure the performance of the demodulated data is good, and at the same time avoid too high peak-to-average ratio of the transmission waveform, it is necessary to allocate pilot and data resources Make a reasonable allocation design.

Contents of the invention

In view of this, the object of the present invention is to provide an uplink resource allocation method and a wireless communication system, which can allocate measurement pilot resources to most users so that they can participate in uplink scheduling.

In order to achieve the first aspect of the above object, the present invention provides a method for allocating uplink resources in a time-frequency resource scheduling system, the method comprising:

According to the channel quality conditions of the scheduled users, the system allocates pilot resources extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit; and sets a special transmission time unit, In this time transmission unit, the measurement pilot resources are allocated to the unscheduled users.

Preferably, the system sets the special transmission time unit to be periodic.

Preferably, the system allocates data resources in the special transmission time unit to non-scheduled users for data transmission, or to scheduled users and/or non-scheduled users for transmission of control information and real-time service data.

The control information includes fed back downlink channel quality indicator (CQI) information and/or downlink data transmission acknowledgment (ACK/NACK) information and/or uplink scheduling request information and/or uplink random access information.

The system may allocate data resources in the special transmission time unit to non-scheduled users for data transmission by dividing subbands.

Preferably, the system allocates data resources to the same user by means of frequency hopping in different said special transmission time units.

Preferably, the channel-associated pilot resource allocated by the system to all users transmitting data in the special transmission time unit is: a frequency band corresponding to the user data in a fixed comb-shaped channel-associated pilot resource, or an extended Code-division or frequency-division pilot resources to full frequency.

The system may allocate the data and/or pilot resources in the special transmission time unit in a code division manner.

Preferably, after the system allocates pilot resources extending to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled users, the system The remaining pilot resources in the transmission time unit are allocated to users who do not transmit data in the transmission time unit for transmitting measurement pilots.

The system can allocate pilot resources extending to a wider frequency band than the data transmission bandwidth in the currently scheduled transmission time unit for the scheduled data transmission users in a code division or frequency division manner.

Preferably, the code-division pilot is a code-division pilot generated by using a sequence obtained by cyclically shifting a constant amplitude zero autocorrelation CAZAC sequence.

Preferably, the frequency-divided pilot has comb-like spectrum characteristics.

Preferably, the transmission time unit includes a plurality of pilot symbols, and the spectrum resource on at least one pilot symbol in the plurality of pilot symbols is allocated by using the method.

The special transmission time unit and other transmission time units may have the same or different structures, including the number of symbols, symbol length, guard interval and transmission time length, which may be the same or different respectively.

Preferably, the measurement pilot allocated by the system to the user is less than or equal to the maximum measurement frequency band that can reflect the average characteristic of the channel.

Preferably, the frequency band of the system is divided into multiple sub-bands, and the measurement pilots are allocated respectively.

Preferably, in the MIMO system, the system allocates measurement pilots to different transmit antennas of the same user and/or antennas of other unscheduled users.

It can be seen from the above scheme that in the present invention, according to the channel quality conditions of the scheduled users, the system allocates a channel extended to a frequency band wider than the data transmission bandwidth in the currently scheduled transmission time unit for each user who is scheduled to send data. and set a special transmission time unit in which measurement pilot resources are allocated to unscheduled users, so that users that are not scheduled in normal scheduling can have more time to send measurement pilots Opportunities, so that most users are allocated measurement pilot resources, so that they can participate in uplink scheduling;

In addition, in the present invention, after the pilot resources are allocated to the users who transmit data in the transmission time unit, these users are no longer allocated measurement pilot resources in the same transmission time unit, thereby ensuring the low peak-to-average ratio of the single carrier. characteristics.

In order to achieve the second aspect of the above object, the present invention provides a wireless communication system, which includes:

The base station is used to allocate a pilot resource extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled user, and set for Unscheduled users are allocated a special transmission time unit of measurement pilot resources, in which transmission time units are allocated measurement pilot resources for unscheduled users, and the pilot resource information allocated to users is issued to user terminals ;

The user terminal is configured to receive resource information allocated to it by the base station, and perform pilot mapping according to the resource information.

Preferably, the base station includes:

The resource allocation module is used to allocate pilot resources extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled users, and set the A special transmission time unit for allocating measurement pilot resources for unscheduled users, in this transmission time unit, allocating measurement pilot resources for unscheduled users, and sending the pilot resource information allocated to users to the transmission module;

A sending module, configured to send the resource information from the resource allocation module to a corresponding user terminal.

It can be seen from the above scheme that the present invention sets a special transmission time unit for allocating measurement pilot resources for unscheduled users in the base station of the wireless communication system. Allocating measurement pilot resources enables users not scheduled in normal scheduling to have more opportunities to send measurement pilots, thereby allocating measurement pilot resources to most users so that they can participate in uplink scheduling.

Description of drawings

FIG. 1 is a schematic diagram of main technologies of single carrier frequency division multiple access;

FIG. 2 is a schematic diagram of subcarrier mapping;

FIG. 3 is a schematic structural diagram of an uplink subframe;

4 is a flowchart of a specific embodiment of the present invention;

FIG. 5 is a schematic diagram of a type A subframe in a specific embodiment of the present invention;

FIG. 6 is a schematic diagram of another type A subframe in a specific embodiment of the present invention;

7 is a schematic diagram of resource allocation in a type A subframe in a code division manner in a specific embodiment of the present invention;

Fig. 8 is a schematic diagram of a type B subframe in a specific embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

The main idea of the present invention is that the system allocates pilot resources extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled users; and A special transmission time unit is set, and in this time transmission unit, measurement pilot resources are allocated to unscheduled users.

According to the channel quality conditions of the scheduled users, when allocating pilot resources extended to a wider frequency band than the data transmission bandwidth in the currently scheduled transmission time unit for each user scheduled to send data, the pilot resource can be used to The method of frequency division may also be used to implement code division of pilot resources.

For the above-mentioned special transmission time unit, the system may set the transmission time unit periodically, for example, one transmission time unit is set every 4 frames. During the service transmission process, the data services of some users require the system to schedule and allocate time-frequency resources according to the channel quality conditions calculated by the measurement pilots sent by the users, while the data services of some users are due to the characteristics of their data types, such as The amount of data is small, or the characteristics of the user, such as the mobile speed is higher than 120km/h, etc., do not need the system to schedule according to the channel quality conditions. In order to ensure that each user can get the opportunity to transmit data in a short period of time, Therefore, in the present invention, the data that does not need to be scheduled is transmitted on the set special transmission time unit. Therefore, the system can also temporarily set the transmission time unit for this type of transmission not to participate in the scheduling of user service data according to the amount of service data that needs to be scheduled and the amount of service data that does not need to be scheduled. The amount of service data of users that need to be scheduled and those that do not need to be scheduled can be determined according to the size and type of data to be sent and other parameters reported by the user to the base station when the user initiates an uplink transmission request, as well as the data transmission status. Since data of users who do not need to be scheduled is transmitted on the transmission time unit set periodically and/or temporarily, at the same time, measurement pilot resources are allocated to the users participating in the scheduling in this transmission time unit, thereby ensuring that scheduling is required and unnecessary All scheduled user data can obtain uplink resources for transmission as soon as possible.

In addition, the data resources in the above special transmission time unit can also be used to transmit control information and real-time service data of scheduled users and non-scheduled users, where the control information includes the feedback of downlink channel quality indicator (CQI) information and/or downlink Data transmission acknowledgment (ACK/NACK) information and/or uplink scheduling request information and/or uplink random access information.

Generally, when the system allocates uplink resources, a transmission time unit is based on a subframe. Subsequent descriptions in this specification will take the aforementioned transmission time unit being a subframe as an example. Furthermore, in order to distinguish the above-mentioned special transmission time unit from the original transmission time unit in the system, in the subsequent description, the original transmission time unit in the system is called a type A subframe, and this type of special transmission time unit is called a type B subframe frame. In the present invention, these two types of subframes may have the same time slot structure, or may have different time slot structures, such as the number of pilot signals and/or data signals in the two types of subframes is different, or the number of pilot signals and/or data signals is different. Or the length of the data signal is not the same.

The full-frequency measurement pilot in the following description refers to the scheduling bandwidth of the system, such as a 10M system, and its scheduling bandwidth is 5M, so the full-frequency measurement pilot refers to the pilot that measures the scheduling bandwidth . The channel-associated pilot occupies a frequency band wider than the data transmission frequency band, which is not exactly the same as the above-mentioned full frequency.

The present invention will be described in detail below through specific examples.

As shown in FIG. 4 , it is a flow chart of the system of this embodiment performing uplink resource allocation and users transmitting information according to the allocated resources. Wherein, in the system, the uplink resource allocation by the base station is taken as an example for illustration. After the base station sets the period of the B-type subframe, this embodiment specifically includes the following steps:

Step 401 , the base station determines whether the subframe type of the current subframe is a type A subframe or a type B subframe, if it is a type A subframe, perform step 402 ; if it is a type B subframe, perform step 405 .

In this step, the base station determines the subframe type of the current subframe according to the preset period of the type B subframe.

Step 402, the base station allocates data resources for the scheduled user according to the channel quality information of the scheduled user and the resource allocation principle in the base station, and allocates pilot resources for the user allocated the data resource and other users, and then assigns the resource information for the user Send it to the user.

In this step, the base station schedules the measurement pilots previously sent by the user according to the needs, analyzes the channel response on the full frequency band, calculates the transmission quality of the user signal on each scheduling frequency band, and allocates it to the user based on the transmission resource allocation rules of the receiving end. Transmission frequency band or time. For example, the measurement standard of channel quality is set as signal interference ratio (SIR), and the system bandwidth is divided into multiple scheduling frequency bands with basic granularity, such as setting the basic scheduling frequency band as 1.25M, etc., and calculating the User's SIR on all scheduled frequency bands. Then one or more continuous or discontinuous scheduling frequency bands with higher SIR values are selected. Of course, discontinuous frequency band allocation is not used when low peak-to-average ratio characteristics need to be guaranteed. The resource allocation principle in the base station can be the principle of maximizing the system capacity, that is, maximizing the throughput of the system, and can also take into account the principle of fairness, that is, ensuring that all users can be served without distinction, or according to the user's priority, etc. , allocate time-frequency resources for data transmission to users.

As for the pilot resources, once the user is scheduled to use the allocated data frequency band resources, at least one broadband channel-associated pilot will be sent. The sub-carrier density of the channel-associated pilot is relatively sparse in the sub-mode, but the information on other sub-carriers can be obtained through an effective interpolation algorithm at the receiving end, and the performance of channel estimation can be guaranteed.

Taking the broadband channel-associated pilot in the frequency division mode as an example, assuming that 1/4 of the subcarrier density is sufficient to ensure the performance of channel estimation, there are 3 user frequency division multiplexing data transmission frequency bands in the subframe on the left in Figure 5 , so the corresponding P1 also has 3 users multiplexed, and there may be a pilot resource remaining, as shown in the white pilot resource part in the figure, this part of the pilot resource is allocated to non-current transmission data users to send measurement pilots. In the frame on the right, there are 4 users for multiplexing, and the pilots are all used up, and there are no remaining measurement pilot resources.

Since the subframe structure on which the present invention is based is a subframe that includes more than one pilot symbol, at least one of the multiple pilot symbols in a type A subframe can use the above-mentioned pilot allocation method, while the remaining pilot symbols Frequency symbols use other pilot allocation methods. Here, the pilot allocation method used for the remaining pilot symbols can be the method of channel-associated pilots accompanying data frequency bands, that is, the system allocates all the frequency bands corresponding to the data on the pilot resources to the user transmitting the data for transmission of the user. Channel-associated pilot; for example, in the subframe including two pilot symbols shown in Figure 5, P1 adopts the above-mentioned method of extending the channel-associated pilot of each data transmission user to the full frequency band, while P2 adopts the method of transmitting The channel-associated pilot of the data user accompanies the data frequency band, which can provide better channel estimation performance. In addition, the pilot allocation method adopted by the remaining pilot symbols can also be that the channel-associated pilots of multiple users who transmit data occupy the same comb-shaped pilot, and the base station also divides the comb-shaped pilot into sub-bands according to the user's data frequency band assigned to the corresponding users, the remaining fixed pilot resources are used as measurement pilots, which are allocated by the base station to other users to send measurement pilots. For example, in the subframe including two pilot symbols shown in Figure 6, P1 uses The method that the channel-associated pilots of each data-transmitting user is extended to the full frequency band is adopted, while P2 adopts the method that the channel-associated pilots of all data-transmitting users occupy the same comb-shaped pilot.

If after allocating pilot resources to users who transmit data, there are still remaining pilot resources at this time domain location, then pilot resources can be allocated to other users, and these users can map their own reference signals to their assigned After the comb pilots are used as the measurement pilots for these users. The specific method of allocating measurement pilots can be that the system directly allocates them to non-current transmission data users for transmission of measurement pilots; it can also allocate a part of the above-mentioned remaining pilot resources to non-current transmission data users for sending measurement pilots. The other part is allocated for other purposes, such as the transmission of control information or data by users who are not currently transmitting data. For example, the remaining pilot resources include three comb-shaped spectrums, and the system can allocate all of them to different users who are not currently transmitting data as measurement pilots, or allocate one or two of them to different non-current transmission users. One user of the data serves as a measurement pilot and the other is allocated for other uses.

For the comb-shaped spectrum allocated to non-transmission data users as transmission measurement pilots, the system can allocate each comb-shaped pilot to a user, or divide the remaining comb-shaped pilots to different users after frequency division. Alternatively, the remaining comb-shaped pilots are decomposed into multiple comb-shaped pilots with more sparse comb teeth, and then allocated to different users. The system can allocate the comb spectrum occupied by the measurement pilot or part of the frequency band in the comb spectrum to users according to the priority of non-transmission data users, and notify these users of the measurement pilot information allocated to these users, and the users receive After being notified, the pilot mapping is performed according to the preset time domain law or the time domain law notified by the system at the same time, until the user is scheduled to send data and sends a broadband channel-associated pilot, or due to priority Low-level factors are notified by the system to stop sending measurement pilots. The time-domain regularity refers to the cycle at which the user sends the measurement pilot, for example, once every three transmission time units.

The way of allocating the pilot resources can also be implemented by means of code division. For example, the sequence obtained by cyclically shifting the sequence with constant amplitude zero autocorrelation (CAZAC) characteristics is used as an orthogonal code sequence, and each sequence is used as a code channel. The system allocates a code channel for each data transmission user to map the The user's pilot signal, as shown in Figure 7, the system can obtain the channel quality information of the full frequency band of each user transmitting data, and if there are remaining code channels, the system can also allocate them to other users who are not currently transmitting data Map its measurement pilot signals.

Step 403, the user who has received the resource allocation information sent by the base station maps its own data and/or reference signals to spectrum resources to form a type A subframe for transmission according to the information.

In this step, after receiving the resource allocation information sent by the base station, the user maps its own data and/or reference signals to spectrum resources for transmission, and then multiplexes and sends them to the base station in type A subframes.

Step 404: After receiving the above-mentioned type A subframe, the base station demodulates user data according to the channel-associated pilot of the user, and obtains channel quality information of each user according to the measurement pilot.

After this step, the base station can perform resource scheduling on the user service data to be scheduled according to the channel quality information of the user obtained through the A-type subframe and the B-type subframe in the next scheduling. Figure 5 shows the time-frequency structure of two type A subframes after user data and pilot multiplexing, in which the service data of three users A, B and C are allocated for data transmission in the type A subframe on the left At different times, data frequency bands are allocated for the business data of four users A, B, C and D according to other information such as user channel quality information and priority. Such resource allocation may be different users in each frame.

Step 405 , the base station allocates data resources to users who do not need to be scheduled according to the resource allocation principle, and allocates pilot resources to users who have allocated data resources and other users, and then sends resource information allocated to users to users.

In order to ensure that users who are not currently scheduled can still be allocated measurement pilot resources to have the opportunity to participate in the next resource scheduling, the system configures periodic B-type subframes to provide fixed measurement pilots Resources are allocated to users who are not scheduled, and data resources in this type of subframe are allocated to data services that do not participate in scheduling, so as to meet the needs of different services.

In this case, the allocation of data transmission resources is no longer scheduled according to channel quality, but in a certain fixed manner. For example, the system bandwidth is divided into several equal transmission sub-bands, and different frequency bands are allocated to a user to transmit data signals. The data frequency bands allocated to these users can be frequency-hopped in different B-type subframes to obtain frequency The gain of diversity can also provide a slow channel quality measurement based on the user's channel-associated pilot.

The channel-associated pilots of these data transmission users occupy the same comb-shaped pilot, and the base station divides the comb-shaped pilot into sub-bands according to the user's data frequency band and distributes them to the corresponding users, and the remaining fixed pilot resources are used as measurement pilots. frequency, the base station allocates to the unscheduled users to send measurement pilots. Here, the unscheduled users include the unscheduled users in the last scheduling and the newly added users participating in the scheduling. In addition, since the subframe structure on which the present invention is based is a subframe that includes more than one pilot symbol, it may be that at least one pilot symbol in a Type B subframe adopts the above-mentioned pilot allocation method, while the remaining pilot symbols Frequency symbols use other pilot allocation methods. Here, other pilot allocation methods adopted by the remaining pilot symbols can be the method of channel-associated pilots accompanied by data frequency bands, or assign a comb-shaped pilot to each user who transmits data, and assign comb-shaped pilots to users who transmit data. The remaining pilot resource after the pilot is used as the measurement pilot, which is allocated by the base station to other users to send the measurement pilot. When allocating measurement pilot resources to users who do not transmit data in B-type subframes, the pilot resources are preferentially allocated to users who participated in the scheduling in the last scheduling but were not scheduled. The specific allocation can be based on the priority of these users level.

As shown in Figure 8, after the system allocates resources at different times, the resource allocation of two class B subframes, in which, by allocating different frequency bands to different users at different times, these users can send data While also performing slow channel quality measurements.

The allocation method of data and/or pilot resources in a type B subframe can also be code division, and at this time, the generation method of data and/or pilot in this subframe can be different from the code division method of a type A subframe . For example, pilot symbols are generated by using orthogonal sequences obtained by periodic shifting of CAZAC sequences, all or part of the code channels obtained by these sequences are used as measurement pilot resources, and data symbols can use orthogonal Walsh sequences Or other spread spectrum sequence generation, multiplexing and transmitting in the conventional CDMA way, such as user code division, and user data and associated pilot frequency multiplexing of I/Q branch. It is also possible to use conventional CDMA code division for all symbols in the B-type subframe, and allocate part of the resources in the code channel generated by each symbol as user measurement pilot resources that participate in scheduling but are not scheduled. After allocating measurement pilots to users who participate in scheduling but are not scheduled, the remaining code channels can be used for transmission of data and control information of non-scheduled users and corresponding channel-associated pilot transmission. Moreover, the frame structure of the type B subframe may be different from that of the type A subframe, for example, the number of symbols, symbol length, guard interval, and transmission time length may all or respectively be different.

Step 406: The user who has received the resource allocation information sent by the base station maps its own data and/or reference signals to spectrum resources to form a type B subframe for transmission according to the information.

In this step, after receiving the resource allocation information sent by the base station, the user maps its own data and/or reference signals to spectrum resources for transmission, and then multiplexes them into a class B subframe and sends it to the base station.

Since the user only needs to measure in a maximum measurement frequency band that can reflect the average characteristics of the channel, that is, the channel with the best quality can be measured when performing channel frequency measurement, so in the present invention, the allocation of measurement pilots , the allocation is made according to the maximum measurement frequency band, and the bandwidth larger than the maximum measurement frequency band does not need to be measured. For example, the bandwidth of 5M is enough to reflect the average characteristics of the channel, then the above-mentioned maximum frequency band range allocated for the measurement pilot can be 5M, if the frequency band of the system is 10M, then the 10M frequency band can be divided into two parts of 5M each Each sub-band is assigned a measurement pilot.

Step 407: After receiving the above-mentioned type B subframe, the base station demodulates user data according to the channel-associated pilot of the user, and obtains channel quality information of each user according to the measurement pilot.

Furthermore, the above method can be applied to a multiple-input multiple-output (MIMO) system, and the measurement pilot resources at this time can also be allocated to different transmit antennas of the same user to select transmit antennas and obtain diversity gain. And when performing multi-antenna simultaneous transmission, each antenna of each scheduled user is assigned an orthogonal path-associated pilot, and antennas of other unscheduled users are assigned measurement pilots.

The above is a detailed description of the resource allocation method of the present invention. The present invention also provides a wireless communication system, which will be described below.

The wireless communication system provided by the present invention includes: a base station and a user terminal. Among them, the base station is used to allocate pilot resources extended to the full frequency in the corresponding transmission time unit for each user scheduled to send data according to the channel quality conditions of the scheduled users, and set it to allocate A special transmission time unit of measurement pilot resources, in which measurement pilot resources are allocated to unscheduled users, and spectrum resource information allocated to users is delivered to user terminals. The user terminal is configured to receive spectrum resource information allocated by the base station, and perform data and/or pilot mapping according to the spectrum resource information.

Specifically, the base station may include a resource allocation module and a sending module, wherein the resource allocation module is used to allocate a full-frequency transmission in the corresponding transmission time unit for each user scheduled to send data according to the channel quality conditions of the scheduled users. pilot resources, and set a special transmission time unit for allocating measurement pilot resources to unscheduled users. The spectrum resource information is sent to the sending module. The sending module is used to send the spectrum resource information from the resource allocation module to the corresponding user terminal.

The resource allocation module in the above-mentioned base station further specifically performs resource allocation in the same manner as in the above-mentioned resource allocation method of the present invention, and will not be described in detail here.

It can be understood that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (19)

1. A method for uplink resource allocation, characterized in that the method comprises: According to the channel quality conditions of the scheduled users, the system allocates pilot resources extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit; and sets a special transmission time unit, In this time transmission unit, the measurement pilot resources are allocated to the unscheduled users. 2. The method according to claim 1, characterized in that the special transmission time unit set by the system is periodic. 3. The method according to claim 1, wherein the system allocates data resources in the special transmission time unit to non-scheduled users for data transmission, or to scheduled users and/or non-scheduled users Used to transmit control information and real-time business data. 4. The method according to claim 3, wherein the control information includes feedback downlink channel quality indicator (CQI) information and/or downlink data transmission acknowledgment (ACK/NACK) information and/or uplink scheduling request information and/or uplink random access information. 5. The method according to claim 3, wherein the system allocates the data resources in the special transmission time unit to non-scheduled users for data transmission by sub-band frequency division. 6. The method according to claim 5, characterized in that the system allocates data resources to the same user by means of frequency hopping in different said special transmission time units. 7. The method according to claim 3, characterized in that, the channel-associated pilots allocated by the system to all users transmitting data in the special transmission time unit are: a fixed comb-shaped pilot combined with the user data The corresponding frequency band resources are code-division or frequency-division pilot resources extended to the full frequency. 8. The method according to claim 3, wherein the system allocates the data and/or pilot resources in the special transmission time unit in a code division manner. 9. The method according to claim 1, characterized in that the system allocates extended data transmission for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled users After receiving the pilot resources with wider bandwidth, the system allocates the remaining pilot resources in the transmission time unit to users who do not transmit data in the transmission time unit for transmitting measurement pilots. 10. The method according to claim 1, characterized in that, the system allocates a bandwidth wider than the data transmission bandwidth to the scheduled data transmission user in the currently scheduled transmission time unit by means of code division or frequency division. Banded pilot resources. 11. The method according to claim 7 or 10, wherein the code-division pilot is a code-division pilot generated by using a sequence obtained by cyclically shifting a constant amplitude zero autocorrelation CAZAC sequence. 12. The method according to claim 10, characterized in that the frequency-divided pilot has a comb-like spectrum characteristic. 13. The method according to any one of claims 1 to 10 and claim 12, wherein the transmission time unit includes a plurality of pilot symbols, at least one of the plurality of pilot symbols Spectrum resources of frequency symbols are allocated using the method described above. 14. The method according to any one of claims 1 to 10 and claim 12, characterized in that the special transmission time unit has the same or different structure as other transmission time units, including the number of symbols, symbols The length, the guard interval and the transmission time length may be the same or different respectively. 15. The method according to any one of claims 1 to 10 and claim 12, wherein the measurement pilot assigned by the system to the user is less than or equal to the maximum measurement frequency band that can reflect the average characteristics of the channel . 16. The method according to any one of claims 1 to 10 and claim 12, wherein the frequency band of the system is divided into multiple sub-bands, and the measurement pilots are allocated respectively. 17. The method according to any one of claims 1 to 10 and claim 12, in a multiple-input multiple-output MIMO system, the system allocates antennas for different transmit antennas of the same user and/or antennas of other unscheduled users Measurement pilot. 18. A wireless communication system, characterized in that the system comprises: The base station is used to allocate a pilot resource extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled user, and set for Unscheduled users are allocated a special transmission time unit of measurement pilot resources, in which transmission time units are allocated measurement pilot resources for unscheduled users, and the pilot resource information allocated to users is issued to user terminals ; The user terminal is configured to receive resource information allocated to it by the base station, and perform pilot mapping according to the resource information. 19. The method according to claim 18, wherein the base station includes: The resource allocation module is used to allocate pilot resources extended to a frequency band wider than the data transmission bandwidth for each user scheduled to send data in the currently scheduled transmission time unit according to the channel quality conditions of the scheduled users, and set the A special transmission time unit for allocating measurement pilot resources for unscheduled users, in this transmission time unit, allocating measurement pilot resources for unscheduled users, and sending the pilot resource information allocated to users to the transmission module; A sending module, configured to send the resource information from the resource allocation module to a corresponding user terminal.

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