CN101345974A - Method and system for scheduling mobile terminal to transmit ascending signal channel detection pilot frequency - Google Patents
Method and system for scheduling mobile terminal to transmit ascending signal channel detection pilot frequency Download PDFInfo
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Abstract
The invention discloses a method for dispatching a mobile terminal to transmit up-channel detection pilot frequency, comprising: obtaining vacancy resource in each transmission time interval wherein the vacancy resource comprises time frequency resource which is not used for transmitting up-channel data; allocating the vacancy resource for each mobile terminal and indicating mobile terminal to send up-channel detection pilot frequency for allocated vacancy resource. Thus, the time frequency resource in system can be reasonably allocated and the waste of time frequency resource can effectively prevented, the utilization ratio of time frequency resource can be increased to a certain degree. The invention also discloses a communication device and communication system.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for scheduling a mobile terminal to transmit an uplink channel sounding pilot.
Background
In a communication system, an uplink pilot signal transmitted by a mobile terminal (UE) is mainly used for demodulation of data and channel estimation, and in a study of a Long Time Evolution (LTE) system, the uplink pilot signal is divided into the following two types:
1. an uplink channel data Demodulation (DM) pilot used for coherent Demodulation/detection of uplink data, also referred to as a data Demodulation reference signal;
2. an uplink Channel Sounding (CS) pilot is used for Channel-based scheduling of uplink in frequency domain or/and time domain, and is also referred to as a quality estimation reference signal.
In general, uplink data and a CS pilot are not transmitted at the same time, or occupy different frequency bands when transmitted at the same time, so that an evolved Node B (eNB) in an LTE system can implement channel-dependent scheduling.
In the conventional LTE system, the UE transmits the CS pilot within a frequency band in which a scheduling bandwidth is limited, at a set cycle. Referring to fig. 1, a plurality of UEs (including UE1, UE2, UE3, and UE4) perform transmission of uplink data (indicated by oblique lines in fig. 1) and CS pilot (indicated by vertical lines in fig. 1) in a Frequency band with a scheduling bandwidth W, where the plurality of UEs transmit their own CS pilot at the same time in the Frequency band by using a multiplexing method, where the multiplexing method includes multiple implementation methods, such as a Frequency-division multiplexing (FDM) method or a Code Division Multiplexing (CDM) method. As shown in fig. 1, in general, each UE transmits the CS pilot at a period of two Transmission Time Intervals (TTIs), which is denoted as 2 × TTI, and the transmission time of the CS pilot is located at the last bit of the corresponding TTI, e.g., the last Orthogonal Frequency Division (OFDM) symbol of the TTI; as shown in fig. 1, a plurality of UEs send their own CS pilots to the eNB through the whole W frequency band according to a set period, the eNB performs channel quality evaluation on the whole W frequency band for each UE according to the received CS pilots, and implements frequency selective scheduling according to the evaluation result, that is, selects appropriate channels for the plurality of UEs to complete scheduling transmission of uplink data of each UE.
As can be seen from fig. 1, since the eNB needs to partition a fixed time-frequency resource for transmitting the CS pilot, uplink data cannot be transmitted in a time period for transmitting the CS pilot; the uplink data transmission usually does not occupy all time-frequency resources, and generates many idle resources (shown in the blank part in fig. 1). Therefore, the time-frequency resource allocation in the existing LTE system is not reasonable, and the utilization rate of the time-frequency resource in the LTE system is affected.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for scheduling a mobile terminal to send an uplink channel detection pilot frequency, which are used for improving the utilization rate of time-frequency resources in a long-term evolution system.
The technical scheme of the embodiment of the invention is as follows,
a method for scheduling a mobile terminal to send an uplink channel sounding pilot comprises the following steps:
acquiring idle resources in each transmission time interval, wherein the idle resources comprise time-frequency resources which are not used for transmitting uplink data;
and allocating the idle resources for each mobile terminal, and indicating the mobile terminal to send the uplink channel detection pilot frequency on the allocated idle resources.
According to the above method:
when allocating idle resources in a transmission time interval for each mobile terminal, the method comprises the following steps:
allocating time period resources for sending uplink channel detection pilot frequency for each mobile terminal according to the time period for each mobile terminal to send uplink data in the subsequent transmission time interval;
and distributing corresponding frequency band resources for the mobile terminals according to the information quality related information of each mobile terminal on the idle resources.
When each mobile terminal is selected, the following operations are executed:
acquiring the last updating time of the channel quality information of each mobile terminal on the idle resource and the interval length of the current time, and preferentially selecting the mobile terminal with the largest interval length; or/and
and determining the transmission time interval to which the idle resources belong, and preferentially selecting the mobile terminal for sending the uplink data in the subsequent transmission time interval.
When allocating corresponding frequency band resources to a mobile terminal, acquiring the last update time of the channel quality information of the mobile terminal on each unit frequency band in the idle resources and the interval length of the current time, and allocating the frequency band resources with the interval length larger than a set threshold value to the mobile terminal.
And when each mobile terminal is instructed to send the uplink channel detection pilot frequency on the allocated idle resources, sending an uplink channel detection pilot frequency scheduling instruction to each mobile terminal through a physical channel for transmitting an uplink data scheduling instruction, wherein the uplink channel detection pilot frequency scheduling instruction comprises the position information of the idle resources obtained by each mobile terminal.
The position information of the idle resource comprises time interval information or/and frequency interval information of the idle resource.
When a plurality of mobile terminals send uplink channel detection pilot frequency on the same frequency band, the plurality of mobile terminals send the uplink channel detection pilot frequency on different time periods of the same frequency band according to a specified time interval; or, the plurality of mobile terminals simultaneously transmit the uplink channel sounding pilot frequency in the same time period of the same frequency band by adopting a multiplexing mode.
The channel quality information of each mobile terminal on the allocated idle resources is updated according to the uplink channel detection pilot frequency reported by the mobile terminal.
In a transmission period at least comprising two transmission time intervals, each mobile terminal simultaneously transmits the uplink channel sounding pilot frequency in the same time period of the frequency band by adopting a multiplexing mode.
A communication device, comprising:
a storage unit for storing channel quality related information of each mobile terminal on a frequency band;
a resource allocation unit, configured to obtain idle resources in each transmission time interval, and allocate the idle resources to each mobile terminal, where the idle resources include time-frequency resources that are not used for transmitting uplink data;
and the communication unit is used for indicating each mobile terminal to send the uplink channel detection pilot frequency on the idle resource allocated to each mobile terminal.
The communication device also comprises a scheduling processing unit used for carrying out channel quality evaluation on idle resources for transmitting the uplink channel detection pilot frequency according to the uplink channel detection pilot frequency sent by the mobile terminal; and updating the channel quality information of the mobile terminal on the idle resource according to the evaluation result.
When the communication device allocates idle resources in a transmission time interval for each mobile terminal, allocating time interval resources for transmitting uplink channel detection pilot frequency for each mobile terminal according to the time interval for transmitting uplink data in the subsequent transmission time interval by each mobile terminal; and distributing corresponding frequency band resources for the mobile terminals according with the set number according to the information quality related information of each mobile terminal on the idle resources.
A communication system comprises an evolution base station and at least one mobile terminal; wherein,
the evolution base station is used for acquiring idle resources in each transmission time interval and instructing the mobile terminal to send uplink channel detection pilot frequency on the allocated idle resources, wherein the idle resources comprise time-frequency resources which are not used for transmitting uplink data;
and the mobile terminal is used for sending the uplink channel detection pilot frequency to the evolution base station on the allocated idle resource according to the indication of the evolution base station.
When the evolution base station allocates idle resources in a transmission time interval for each mobile terminal, the evolution base station allocates time period resources for transmitting uplink channel detection pilot frequency for each mobile terminal according to the time period for transmitting uplink data by each mobile terminal; and distributing corresponding frequency band resources for the mobile terminals according with the set number according to the information quality related information of each mobile terminal on the idle resources.
In the embodiment of the invention, the evolution base station allocates the idle resources in each transmission time interval to each mobile terminal in the system and instructs each mobile terminal to send the uplink channel detection pilot frequency on the allocated idle resources. Therefore, the evolution base station does not need to divide fixed time-frequency resources to transmit the uplink channel detection pilot frequency, so that the time-frequency resources in the system are reasonably distributed, and the utilization rate of the time-frequency resources in each transmission time interval is improved.
Drawings
FIG. 1 is a schematic diagram illustrating a time-frequency resource allocation of an LTE system in the prior art according to the present invention;
fig. 2A is an architecture diagram of an LTE system according to an embodiment of the present invention;
FIG. 2B is a functional block diagram of an eNB in an embodiment of the present invention;
FIG. 2C is a diagram illustrating the resource distribution of the W-band inner unit channel according to an embodiment of the present invention;
fig. 3A is a schematic diagram of time-frequency resource allocation of a first LTE system according to an embodiment of the present invention;
fig. 3B is a schematic diagram of time-frequency resource allocation of a second LTE system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an eNB controlling a UE to transmit a CS pilot in an embodiment of the present invention.
Detailed Description
In order to reasonably distribute time-frequency resources in a Long Term Evolution (LTE) system and further improve the utilization rate of the time-frequency resources in each Transmission Time Interval (TTI). In the embodiment of the invention, an evolved Node B (eNB) in an LTE system allocates idle resources in each transmission time interval to each mobile terminal (UE), and instructs each UE to transmit a self uplink channel detection pilot frequency (CS pilot frequency) to the eNB on the acquired idle resources, and receives the CS pilot frequency transmitted by each UE and performs corresponding subsequent processing; the idle resources comprise time-frequency resources which are not used for transmitting uplink data in the LTE system.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 2A, in a particular embodiment, an LTE system includes an eNB20 and at least one UE 21. The eNB20 is configured to obtain idle resources in each TTn, and instruct the UE21 to send a CS pilot on the allocated idle resources, where the idle resources include time-frequency resources that are not used for transmitting uplink data; the UE21 is configured to send a CS pilot to eNB20 on the allocated free resources as indicated by eNB 20.
Referring to fig. 2B, in a specific embodiment, the eNB20 includes a storage unit 200, a resource allocation unit 201, a communication unit 202, and a scheduling processing unit 203.
The storage unit 200 is used to store a channel quality information list (CQI list) of each UE 21. The contents of the CQI list are shown in table 1:
TABLE 1
In practical applications, the eNB20 maintains a CQI list for each UE with uplink traffic registered in the eNB20, as shown in table 1, where the table entry content of the CQI list includes a resource unit index, channel quality information q, and time information t, where:
the resource unit index includes identification information of all unit channel resources in the W band, and as shown in fig. 2C, in each TTI, the W band is divided into m equal parts, identification information of the m equal parts is 1 and 2.... m, respectively, and each equal part is referred to as one unit channel resource;
the channel quality information records quality related information of each unit channel resource in the W frequency band, and the eNB20 selects a proper channel resource for the UE according to the information to send uplink data; each time the eNB20 receives a CS pilot sent by the UE, the eNB updates the channel quality information of the corresponding unit channel resource in the CQI list of the UE according to the result of channel quality estimation;
the time information t records the interval length of the channel quality information corresponding to the current time and the last update respectively.
The resource allocation unit 201 is configured to acquire idle resources in each transmission time interval, and allocate the idle resources to each UE 21; when a plurality of UEs 21 exist in the LTE system, the resource allocation unit determines the priority of each UE21 according to the channel quality information list of each UE21, and allocates idle resources to each UE21 in order of priority from high to low.
The communication unit is configured to instruct the UEs 21 to transmit uplink channel sounding pilots on the respective allocated free resources and to receive uplink channel sounding pilots transmitted by each UE21 to the eNB 20.
The scheduling processing unit 203 is configured to perform channel quality estimation on corresponding idle resources according to the CS pilots sent by each UE 21; and correspondingly updating respective channel quality information lists of the UE21 according to the evaluation result;
based on the system architecture shown in fig. 2A, in this embodiment, the eNB does not allocate a fixed time-frequency resource to the CS pilot, but uses an idle resource that is not used for transmitting uplink data in each TTI to implement transmission of the CS pilot, so that the time-frequency resource in the system can be more fully utilized.
Referring to fig. 3A, in the W band, the diagonal line part shows the time-frequency resources allocated by eNB20 for transmitting uplink data to each UE, and the vertical line part shows the time-frequency resources allocated by eNB20 for transmitting CS pilot to each UE. In the gap between the uplink data transmission of each UE, the eNB20 transmits the CS pilot, and the eNB20 does not need to partition fixed time-frequency resources for the UE to transmit the CS pilot. For any block of free resources, the eNB20 may be assigned to at least one UE for transmission of CS pilots.
The following is a detailed description of four UEs (including UE1, UE2, UE3, and UE4) as an example.
As shown in fig. 3A, eNB20 allocates certain time-frequency resources for UE2 to transmit uplink data in TTI n, and eNB20 allocates idle resources to multiple UEs for transmitting CS pilots, such as UE1, UE2, and UE 3. The resource allocation manner in TTI n is usually that resources have been allocated and indicated to each UE by resource allocation indication information within a certain transmission time interval (e.g., TTI n-1, TTI n-2, TTI n-3.) before TTI n, e.g., eNB20 allocates resources in TTI n-1 and sends resource allocation indication information to each UE, including UE1, UE2, and UE 3. Each UE uploads data or CS pilot on its respective time-frequency resource allocated to it by eNB20 in TTI n.
The eNB20 generally refers to the channel quality information of each UE to reasonably allocate idle resources, and the following description will take the example that the eNB20 allocates time-frequency resources to four UEs at the same time.
As shown in fig. 3B, taking the allocation of idle resources in TTIn as an example, the specific process is as follows:
step S300: the eNB20 obtains CQI lists of the UE1, the UE2, the UE3, and the UE4, and allocates time period resources for transmitting the CS pilot to the four UEs in the TTIn according to a time period in which each UE transmits uplink data in a subsequent TTI (e.g., TTIn +1, TTIn + 2.....);
step S301: the eNB20 selects a UE transmitting a CS pilot on an idle resource in TTIn according to the CQI lists of each of the UE1, UE2, UE3, and UE 4.
In each TTI, the number of UEs that allow CS pilots to be transmitted through idle resources is limited, and may be one, two, or three. Since there are four different UEs in the current LTE system, the eNB20 needs to select the UE that sends the CS pilot, and the eNB20 may follow the following principle when selecting the UE:
first principle: the UEs with larger t in the CQI list corresponding to the idle resources in TTI n are preferentially selected. When the first principle is executed, the eNB20 may update the corresponding channel quality information in the CQI list of each UE in time, thereby improving the reliability of the CQI list of each UE.
For example: the idle resources in TTI n include 15 unit channel resources with resource unit indexes of 20, 21.... 35, then the eNB20 obtains T (including T20, T21.... T35) corresponding to the 15 unit channel resources from the CQI lists of the UE1, the UE2, the UE3, and the UE4, respectively, and adds the T20, T21.... T35 in each CQI list to obtain total time information T (including T1, T2, T3, and T4), and then the eNB20 compares the sizes of T1, T2, T3, and T4, with the result that: t1 > T3 > T2 > T4, since the limited number is "three", then eNB20 selects UE1, UE2 and UE3 to transmit CS pilots in idle resources according to the comparison result, as shown in fig. 3A.
Second principle: a UE that will transmit uplink data in a subsequent period of TTI n (e.g., TTI n +1, TTIn + 2.) is preferably selected. When the second principle is executed, the eNB20 may update the corresponding channel quality information in the CQI list of the UE that will send uplink data in the subsequent TTI in time, so that the eNB20 may allocate time-frequency resources for sending uplink data to the corresponding UE according to the updated CQI list, thereby ensuring the transmission quality of uplink data and ensuring the performance of the eNB20 in scheduling control of the UE.
In practical applications, the eNB20 may only execute the first principle or only execute the second principle to select the UE when selecting the UE, or may simultaneously execute two principles to select the UE, and if the eNB20 simultaneously selects the UE according to the two principles, the corresponding execution priority may be set. Of course, in some cases, the eNB20 may prefer UEs with emergency traffic or UEs with VIP traffic without being limited by any principle.
Step S320: the eNB20 allocates the frequency band resource for transmitting the CS pilot to the selected UE in the idle resource of TTIn.
Taking UE2 as an example, referring to a vertical line part marked with "UE 2" in TTI n in fig. 3A, when allocating an idle resource to UE2, eNB20 preferentially selects an idle resource in TTI n and allocates a unit channel resource with t greater than a set threshold (e.g., 100ms, 200 ms...) to UE2 for transmitting a CS pilot according to a CQI list of UE 2.
On the other hand, in the embodiment of the present invention, when multiple UEs send CS pilots through idle resources in each TTI, the eNB20 may instruct the multiple UEs to send their own CS pilots in the same time period of the same Frequency band by using a Frequency-division multiplexing (FDM) method or a Code Division Multiplexing (CDM) method; for example, referring to the vertical portion labeled "UE 3/UE 1" within the TTIn in FIG. 3A, in TTI n, UE3 transmits the CS pilot to eNB20 at the same time period of the same channel as UE 1. Or,
the eNB20 may also instruct the UEs to transmit their CS pilots in different Time periods of the same frequency band according to a set Time interval (including a zero interval and a non-zero interval) in a Time-Division Multiplexing (TDM) manner. For example, referring to the vertical line portions labeled "UE 2" and "UE 1" in TTI n +1 and TTI n +2 in fig. 3A, in TTI n +1, UE2 and UE1 successively transmit CS pilots to eNB20 at different time periods of the same frequency band, and in TTI n +2, UE1 and UE2 successively transmit CS pilots to eNB20 at time intervals of different time periods of the same frequency band.
The FDM method, CDM method, and TDM method may also be used in combination with each other, and are not described herein again.
Step S330: the eNB20 sends corresponding scheduling instructions to the selected UE1, UE2 and UE3, and indicates the position information of the idle resources obtained by the three UEs, respectively, to the three UEs, where the position information includes time period information and/or frequency band information of the idle resources.
Step S340: the UE1, the UE2, and the UE3 obtain the location information of the idle resources respectively allocated to the corresponding fields of the scheduling command according to the identification information (e.g., UE ID) in the scheduling command, and transmit the CS pilots of themselves to the eNB20 through the obtained idle resources.
The eNB20 performs channel quality assessment for corresponding UEs on idle resources transmitting the three pilots according to CS pilots transmitted by each of the UE1, the UE2, and the UE3, calculates CQI information of the three UEs on the corresponding idle resources, and updates part of parameters in two entries, namely "channel quality information q" and "time information t", in CQI lists of the three UEs.
According to the above description of the embodiments, the eNB20 also receives the CS pilots transmitted by the selected UEs in the same way in the transmission time intervals of TTI n +1 and TTI n +1.
In order to obtain the channel quality information of each UE on all the unit channel resources in the W-band in time, the eNB20 needs to take multiple transmission time intervals as a cycle (e.g., 1 × TTI, 2 × TTI, 3 × TTI.. times.) into consideration, which comprehensively considers the CS pilot transmission condition of each UE in one cycle. For example, referring to fig. 3A, the eNB20 uses 3 × TTI as a period (TTI n, TTI n +1, and TTI n +2), and in this period, the time-frequency resources for transmitting the CS pilot transmitted by the UE1 include all unit channel resources in the W band, so that the eNB20 can obtain the channel quality information of all unit channel resources in the W band for the UE1 by comprehensively considering the case that the UE1 transmits the CS pilot in this period, thereby providing a reliable basis for the eNB20 to perform scheduling control on the UE1 in subsequent TTIs (e.g., TTI n +3, TTI n + 4). Likewise, the eNB20 can also obtain channel quality information for UE1 and UE3 for all unit channel resources within the W-band according to the case where UE2 and UE3 transmit CS pilots in the period.
On the basis of the above embodiment, in order to avoid that a certain part of time-frequency resources in the W band are occupied by uplink data for a long time, another implementation may be adopted.
Referring to fig. 4, in a specific embodiment, an eNB20 uses 4 × TTI as a cycle, and transmits a CS pilot sent by a UE1, a UE2, a UE3, and a UE4 in a multiplexing manner through all W bands at the last bit of the first TTI in each cycle; meanwhile, the eNB20 transmits the CS pilots transmitted by the selected UE through idle resources in the other three TTIs in each period, so that the eNB20 can periodically obtain CQI information of all unit channel resources in the W band, thereby performing effective scheduling control on the UE transmitting uplink data in the system. Of course, the eNB20 may also transmit the CS pilots of the four UEs in the same manner in the first bit/middle period/last bit of the second TTI/third TTI/fourth TTI in each cycle, which is described in this embodiment as a preferred embodiment and is not described herein again.
On the other hand, in the embodiment of the present invention, the eNB20 instructs the selected UE to transmit the CS pilot using a new signaling format (hereinafter referred to as a CS pilot scheduling instruction).
In the prior art, the scheduling command (hereinafter referred to as an uplink data scheduling command) used by the eNB20 to instruct the UE to transmit uplink data is a control signaling based on a physical layer and has a specific signaling format, so if the signaling format of the CS pilot scheduling command is set to the specific information format, the eNB20 may also transmit the CS pilot scheduling command through an uplink data scheduling channel, which eliminates the need to set a dedicated channel for CS pilot scheduling, and simplifies the setting of the channel; meanwhile, the scheduling of the uplink CS pilot frequency is finished by utilizing physical layer signaling, so that the real-time performance of the uplink CS pilot frequency scheduling can be ensured, and the eNB20 can obtain effective uplink channel quality information in time, thereby effectively scheduling and controlling the UE.
In the prior art, the uplink data scheduling command sent by the eNB20 has a unique signaling format, and as shown in table 2, the uplink data scheduling command includes three parts, namely, a UE ID, a data scheduling resource indication, and other information. Wherein "UE ID" is used to uniquely identify the UE currently scheduled by eNB 20; "data scheduling resource indication" is used to identify the relevant information (e.g. TTI number, frequency band, etc.) of the time-frequency resource allocated to the currently scheduled UE; the "other information" is used to record relevant information required when the UE transmits uplink data.
TABLE 2
| UE ID | Data scheduling resource indication | Other information |
Based on the signaling format, as shown in table 3, the embodiment of the present invention adds an "indication field" part to the existing uplink data scheduling instruction to form a new signaling format, where "UE ID" is used to uniquely identify the UE currently scheduled by eNB 20; the "indication field" is used to identify the nature of the scheduling command transmitted by eNB20, and in this embodiment, when the value of the indication field is 1, it indicates that eNB20 transmitted the data scheduling command, and when the value of the indication field is 0, it indicates that eNB20 transmitted the CS pilot scheduling command; the "data/CS pilot scheduling resource indication" is used to record the location information of the time-frequency resource allocated by eNB20 to the currently scheduled UE, where the location information includes a time period identifier and/or a frequency band identifier of the time-frequency resource. If the value of the indication domain is 1, the time-frequency resource is used for transmitting uplink data sent by the UE, and if the value of the indication domain is 0, the time-frequency resource is used for transmitting CS pilot frequency sent by the UE; the "other information" is used to record the relevant information required by the UE to transmit the uplink data/CS pilot. In another embodiment, the positions of the "UE ID" and the "indication field" may be interchanged, and are not described herein.
TABLE 3
| UE ID | Indication field | data/CS pilot scheduling resource indication | Other information |
In this embodiment, the length of the "indication field" may be set to 1 bit, and therefore, the scheduling commands respectively adopting the two signaling formats are almost the same in length, so that the eNB20 can send the CS pilot scheduling command through the physical channel for sending the uplink data scheduling command, that is, the eNB20 sends the scheduling command adopting the signaling format shown in table 3 on the physical channel, and the UE identifies whether the scheduling command is the uplink data scheduling command or the CS pilot scheduling command by the value of the indication field part in the scheduling command.
In the embodiment of the present invention, eNB20 allocates the idle resources in each TTI to each UE in the system, and instructs each UE to transmit the CS pilot on the allocated idle resources. Thus, the eNB20 does not need to partition fixed time-frequency resources to transmit CS pilots, so that the time-frequency resources in the system are reasonably allocated, and the utilization rate of the time-frequency resources in each TTI is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. A method for scheduling a mobile terminal to transmit an uplink channel sounding pilot, comprising:
acquiring idle resources in each transmission time interval, wherein the idle resources comprise time-frequency resources which are not used for transmitting uplink data;
and allocating the idle resources for each mobile terminal, and indicating the mobile terminal to send the uplink channel detection pilot frequency on the allocated idle resources.
2. The method of claim 1, wherein allocating free resources in a transmission time interval for each mobile terminal comprises:
allocating time period resources for sending uplink channel detection pilot frequency for each mobile terminal according to the time period for each mobile terminal to send uplink data in the subsequent transmission time interval;
and distributing corresponding frequency band resources for the mobile terminals according to the information quality related information of each mobile terminal on the idle resources.
3. The method of claim 2, wherein the following operations are performed when selecting the mobile terminals:
acquiring the last updating time of the channel quality information of each mobile terminal on the idle resource and the interval length of the current time, and preferentially selecting the mobile terminal with the largest interval length; or/and
and determining the transmission time interval to which the idle resources belong, and preferentially selecting the mobile terminal for sending the uplink data in the subsequent transmission time interval.
4. The method of claim 3, wherein when allocating the corresponding frequency band resource to the mobile terminal, the last update time of the channel quality information of the mobile terminal on each unit frequency band in the idle resource and the interval length of the current time are obtained, and the frequency band resource with the interval length greater than the set threshold is allocated to the mobile terminal.
5. The method of claim 1, wherein when each mobile terminal is instructed to transmit the uplink channel sounding pilot on the allocated idle resource, transmitting an uplink channel sounding pilot scheduling command to each mobile terminal through a physical channel transmitting the uplink data scheduling command, wherein the uplink channel sounding pilot scheduling command includes location information of the idle resource obtained by each mobile terminal.
6. The method of claim 5, wherein the location information of the idle resource comprises period information or/and frequency band information of the idle resource.
7. The method according to any of claims 1-6, wherein when a plurality of mobile terminals transmit the uplink channel sounding pilot on the same frequency band, the plurality of mobile terminals transmit the uplink channel sounding pilot on different time periods of the same frequency band at specified time intervals; or, the plurality of mobile terminals simultaneously transmit the uplink channel sounding pilot frequency in the same time period of the same frequency band by adopting a multiplexing mode.
8. The method of claim 7, wherein the channel quality information of each mobile station on the allocated idle resources is updated according to the uplink channel sounding pilot reported by the mobile station.
9. The method according to any of claims 1-6, characterized in that in a transmission period comprising at least two transmission time intervals, each mobile terminal simultaneously transmits uplink channel sounding pilots in a multiplexed manner on the same time period of the frequency band.
10. A communications apparatus, comprising:
a storage unit for storing channel quality related information of each mobile terminal on a frequency band;
a resource allocation unit, configured to obtain idle resources in each transmission time interval, and allocate the idle resources to each mobile terminal, where the idle resources include time-frequency resources that are not used for transmitting uplink data;
and the communication unit is used for indicating each mobile terminal to send the uplink channel detection pilot frequency on the idle resource allocated to each mobile terminal.
11. The communications apparatus of claim 10, further comprising:
the scheduling processing unit is used for carrying out channel quality evaluation on idle resources for transmitting the uplink channel detection pilot frequency according to the uplink channel detection pilot frequency sent by the mobile terminal; and updating the channel quality information of the mobile terminal on the idle resource according to the evaluation result.
12. The communication apparatus according to claim 10, wherein the communication apparatus allocates, when the communication apparatus allocates the idle resources in one transmission time interval for each mobile terminal, the time interval resources for transmitting the uplink channel sounding pilot for each mobile terminal according to the time interval in which each mobile terminal transmits the uplink data in the subsequent transmission time interval; and distributing corresponding frequency band resources for the mobile terminals according with the set number according to the information quality related information of each mobile terminal on the idle resources.
13. A communication system comprising an evolved base station and at least one mobile terminal; wherein,
the evolution base station is used for acquiring idle resources in each transmission time interval and instructing the mobile terminal to send uplink channel detection pilot frequency on the allocated idle resources, wherein the idle resources comprise time-frequency resources which are not used for transmitting uplink data;
and the mobile terminal is used for sending the uplink channel detection pilot frequency to the evolution base station on the allocated idle resource according to the indication of the evolution base station.
14. The communication system according to claim 13, wherein when the enb allocates idle resources in a transmission time interval for each ue, the enb allocates time interval resources for transmitting the uplink channel sounding pilot for each ue according to the time interval for transmitting uplink data of each ue; and distributing corresponding frequency band resources for the mobile terminals according with the set number according to the information quality related information of each mobile terminal on the idle resources.
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