CN101431362A - Subframe distribution method and apparatus for TDD system - Google Patents
Subframe distribution method and apparatus for TDD system Download PDFInfo
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Abstract
The invention relates to the technical field of mobile communication, in particular to a subframe distribution technology for a time division duplex system. The invention embodiment discloses a method and a device for subframe distribution for the time division duplex system which reduces the time slot proportion regulation granularity and strengthens the flexibility satisfying different business requirements. The method for the subframe distribution for the time division duplex system comprises: according to proportion of an uplink business volume and a downlink business volume, determining configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is taken as a subframe distribution period; according to the configuration proportion of the uplink time slot and the downlink time slot, determining a distribution mode of an uplink business subframe and a downlink business subframe in at least one wireless frame. The device for the subframe distribution for the time division duplex system comprises a configuration proportion determination unit and a first distribution mode determination unit. The invention embodiment also provides a base station and user equipment.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a subframe allocation technology of a time division duplex system.
Background
The third Generation Mobile Communication system (3G) adopts Code Division Multiple Access (CDMA) technology, supports multimedia services, and has high competitive power in The coming years. To ensure Long-Term effectiveness of such competitive power, the 3rd Generation Partnership Project (3 GPP) has initiated standardization work for Long Term Evolution (LTE). The LTE system is based on Orthogonal Frequency Division Multiplexing (OFDM) technology, and has a subcarrier spacing set to 15kHz and a corresponding OFDM symbol length of 66.67 us. The LTE system includes two Duplex modes, Time Division Duplex (TDD) and Frequency Division Duplex (FDD).
TD-SCDMA is the only standard which adopts TDD mode in three international standards of 3G system. The TD-SCDMA standard supports the transmission of uplink and downlink asymmetric services, and has greater flexibility in the utilization of frequency spectrum. The TD-SCDMA system comprehensively adopts advanced technologies such as intelligent antenna, uplink synchronization, joint detection and software radio, so that the system has higher performance and spectrum utilization rate. In order to maintain the long-term competitive capability of TD-SCDMA system, TD-SCDMA system also requires long-term evolution.
In order to ensure the coexistence with the unique TDD-based TD-SCDMA standard in the 3G system, the lte TDD system adopts a frame structure as shown in fig. 1: a 10ms radio Frame (Frame) is composed of two 5ms fields, each field is composed of 8 0.5ms Traffic Slots (TS) and three special areas, which are respectively: downlink pilot time slot (DwPTS), downlink-to-uplink guard interval (GP), and uplink pilot time slot (UpPTS). Two consecutive service slots constitute a service Subframe (SF), and the length of each service subframe is 1 ms. The length of the three special areas can be flexibly configured by higher layer signaling, but the total length remains unchanged for 1 ms. Each half frame includes 4 traffic subframes, and traffic subframe # 0 is always allocated to transmit downlink traffic. Each half frame is configured with a pair of switching points, wherein the downlink-uplink switching point is positioned in the special region GP, the uplink-downlink switching point is positioned at the boundary of other service subframes except the service subframe # 0, and two service time slots of the same service subframe can not be switched in the uplink and the downlink. The parameters of the traffic slot in the frame structure of the lte tdd system are given in table 1, and the number of OFDM symbols included in the traffic slot is determined according to the length of a Cyclic Prefix (CP) in the OFDM symbol.
TABLE 1
When a service time slot is allocated to transmit uplink service, the service time slot can be called as an uplink time slot, and two uplink time slots form an uplink service subframe; when one service time slot is allocated to transmit downlink service, the service time slot may be called a downlink time slot, and two downlink time slots form one downlink service subframe. The uplink and downlink time slots can be flexibly allocated, and different service requirements can be met by adjusting the configuration proportion of the uplink time slots and the downlink time slots, which is one of the advantages of the TDD mode. In a frame structure configured in an LTE TDD system, two 5ms fields included in a 10ms radio frame are completely the same, that is, the allocation of uplink and downlink timeslots can only be performed within a 5ms field, and a 5ms field is used as an allocation period of an uplink timeslot and a downlink timeslot. The allocation mode of all uplink service subframes and downlink service subframes in an LTE TDD system with 5ms half-frames as the subframe allocation period is simply introduced. As shown in fig. 2, SF0 denotes traffic subframe # 0, SF1 denotes traffic subframe # 1, SF2 denotes traffic subframe # 2, and SF3 denotes traffic subframe # 3; s denotes a special area including DwPTS, GP, and UpPTS. For the convenience of distinguishing, the service time slot allocated for transmitting the downlink service is filled with a vertical line, the service time slot allocated for transmitting the uplink service is filled with a diagonal line, and the special area is filled with dots. As can be seen from fig. 2, there are four configuration ratios of the uplink timeslot and the downlink timeslot supported in the LTE TDD system, each configuration ratio corresponds to one allocation manner, and is represented as a subframe allocation pattern in fig. 2, which is: in the first allocation mode, SF0 is a downlink traffic subframe, SF1, SF2 and SF3 are uplink traffic subframes, and downlink timeslots: the configuration ratio of the uplink time slot is 1: 3; in the second allocation mode, SF0 and SF3 are downlink traffic subframes, SF1 and SF2 are uplink traffic subframes, and downlink time slots: the configuration ratio of the uplink time slot is 2: 2; in the third allocation mode, SF0, SF2, and SF3 are downlink traffic subframes, SF1 is an uplink traffic subframe, and downlink timeslots: the configuration ratio of the uplink time slot is 3: 1; in the fourth allocation mode, all of SF0, SF1, SF2, and SF3 are downlink traffic subframes, and downlink timeslots: the configuration ratio of the uplink time slot is 4: 0. And when the 5ms half frame is taken as the sub-frame distribution period, the corresponding time slot proportion adjustment granularity is 25%.
In the existing LTE TDD system, a subframe allocation scheme which takes a 5ms half frame as a subframe allocation period only supports four configuration proportions of an uplink time slot and a downlink time slot, wherein the time slot proportion adjustment granularity is 25 percent, and the time slot proportion adjustment granularity is large, so that the adjustment is not flexible when different service requirements are met; each half frame is configured with a pair of switching points corresponding to a downlink-to-uplink guard interval GP, because the GP is determined by the coverage of the base station, in a large coverage scenario, the overhead of the GP is large.
Disclosure of Invention
The embodiment of the invention provides a subframe allocation method and a subframe allocation device of a time division duplex system, which are used for reducing the time slot proportion adjustment granularity in the time division duplex system and enhancing the flexibility of meeting different service requirements.
The embodiment of the invention provides a subframe allocation method of a time division duplex system, which comprises the following steps:
determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
and determining the distribution mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
The embodiment of the invention provides a subframe distribution device of a time division duplex system, which comprises:
a configuration ratio determination unit: the method comprises the steps of determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
a first recipe determination unit: and the method is used for determining the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
An embodiment of the present invention provides a base station, including:
a configuration ratio determination unit: the method comprises the steps of determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
a first recipe determination unit: and the method is used for determining the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
The embodiment of the invention provides a subframe allocation method of a time division duplex system, which comprises the following steps:
receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the at least one wireless frame is taken as a subframe distribution period;
determining the distribution mode of an uplink service subframe and a downlink service subframe in the at least one wireless frame according to the indication information;
and determining an uplink service subframe and a downlink service subframe in the at least one radio frame according to the distribution mode.
The embodiment of the invention provides a subframe distribution device of a time division duplex system, which comprises:
an instruction information receiving unit: the wireless terminal comprises a wireless frame, a first wireless terminal and a second wireless terminal, wherein the wireless frame is used for receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the wireless frame is used as a subframe distribution period;
a second allocation method determination unit: the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame is determined according to the indication information;
a subframe allocation unit: and the method is used for determining the uplink service subframe and the downlink service subframe in the at least one radio frame according to the distribution mode.
An embodiment of the present invention provides a user equipment, including:
an instruction information receiving unit: the wireless terminal comprises a wireless frame, a first wireless terminal and a second wireless terminal, wherein the wireless frame is used for receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the wireless frame is used as a subframe distribution period;
a second allocation method determination unit: the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame is determined according to the indication information;
a subframe allocation unit: and the method is used for determining the uplink service subframe and the downlink service subframe in the at least one radio frame according to the distribution mode.
The method and the device for allocating the subframes of the time division duplex system provided by the embodiment of the invention determine that at least one wireless frame is used as the subframe allocation period, increase the types of the allocation proportion of the uplink time slot and the downlink time slot, and can select the allocation mode of the uplink service subframe and the downlink service subframe according to the proportion of the uplink service volume and the downlink service volume, thereby reducing the adjustment granularity of the proportion of the time slots and enhancing the flexibility of meeting different service requirements.
Drawings
Fig. 1 is a schematic diagram of a frame structure of an LTE TDD system in the prior art;
FIG. 2 is a diagram illustrating a subframe allocation pattern with half a radio frame as an allocation period in the prior art;
FIG. 3 is a schematic diagram of a subframe allocation pattern of 2 pairs of switching points in an embodiment of the present invention, wherein a radio frame is used as a subframe allocation period;
FIG. 4 is a schematic diagram of a subframe allocation pattern with a subframe allocation period of a radio frame and 1 pair of switching points according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a subframe allocation pattern with a radio frame as a subframe allocation period and without a switch point according to an embodiment of the present invention;
FIG. 6 is a flowchart of a subframe allocation method at the base station side according to an embodiment of the present invention;
fig. 7 is a flowchart of a subframe allocation method at a user equipment side according to an embodiment of the present invention;
fig. 8 is a block diagram of a subframe allocation apparatus of a TDD system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention breaks through the limitation that a 5ms half frame is taken as a subframe allocation period in the frame structure of the existing LTE TDD system, and provides a subframe allocation method taking at least one 10ms wireless frame as the subframe allocation period, so as to reduce the time slot proportion adjustment granularity and enhance the flexibility of meeting different service requirements.
The embodiment of the invention firstly uses a 10ms wireless frame as a subframe allocation period, and introduces the configuration proportion of an uplink time slot and a downlink time slot and the allocation mode of a corresponding uplink service subframe and a corresponding downlink service subframe in detail. At most two pairs of switching points can be configured in a radio frame, and according to the logarithm of the configured switching points, there can be several allocation manners, which are described in detail below:
when 2 pairs of handover points are configured in a 10ms radio frame, there are 10 allocation manners, each allocation manner corresponds to one subframe allocation pattern, as shown in fig. 3, for the convenience of comparing fig. 3 and fig. 2, the same representation method is adopted, SF0 represents a service subframe # 0, SF1 represents a service subframe # 1, SF2 represents a service subframe # 2, and SF3 represents a service subframe # 3; s denotes a special area including DwPTS, GP, and UpPTS. Filling a vertical line in the service time slot allocated for transmitting the downlink service, filling an oblique line in the service time slot allocated for transmitting the uplink service, and filling a dot in the special area. The subframe allocation patterns of the two 5ms fields in the 10ms radio frame may be the same or different, and the detailed description of the subframe allocation patterns of 10ms is described in detail according to the sequence number in fig. 3:
in the subframe allocation pattern with the sequence number of 1, SF0 of each 5ms half frame is a downlink service subframe, and SF1, SF2 and SF3 are uplink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 2: 6;
in the subframe allocation pattern with the sequence number of 2, SF0 of a 5ms half frame is a downlink service subframe, and SF1, SF2 and SF3 are uplink service subframes; the SF0 and SF3 of the other 5ms half frame are downlink service subframes, and the SF1 and SF2 are uplink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 3: 5;
in the subframe allocation pattern with the sequence number of 3, SF0 of a 5ms half frame is a downlink service subframe, and SF1, SF2 and SF3 are uplink service subframes; the SF0, SF2 and SF3 of the other 5ms half frame are downlink service subframes, and the SF1 is an uplink service subframe; downlink time slot: the configuration ratio of the uplink time slot is 4: 4;
in the subframe allocation pattern with the sequence number of 4, SF0 of a 5ms half frame is a downlink service subframe, and SF1, SF2 and SF3 are uplink service subframes; the SF0, SF1, SF2 and SF3 of the other 5ms half frame are all downlink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 5: 3;
in the subframe allocation pattern with the sequence number of 5, SF0 and SF3 of each 5ms half frame are downlink service subframes, and SF1 and SF2 are uplink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 4: 4;
in the subframe allocation pattern with the sequence number of 6, SF0 and SF3 of a 5ms half frame are downlink service subframes, and SF1 and SF2 are uplink service subframes; the SF0, SF2 and SF3 of the other 5ms half frame are downlink service subframes, and the SF1 is an uplink service subframe; downlink time slot: the configuration ratio of the uplink time slot is 5: 3;
in the subframe allocation pattern with the sequence number of 7, SF0 and SF3 of a 5ms half frame are downlink service subframes, and SF1 and SF2 are uplink service subframes; the SF0, SF1, SF2 and SF3 of the other 5ms half frame are all downlink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 6: 2;
in the subframe allocation pattern with the sequence number of 8, SF0, SF2 and SF3 of two 5ms half frames are downlink service subframes, and SF1 is an uplink service subframe; downlink time slot: the configuration ratio of the uplink time slot is 6: 2;
in the subframe allocation pattern with the sequence number of 9, SF0, SF2 and SF3 of a 5ms half frame are downlink service subframes, and SF1 is an uplink service subframe; the SF0, SF1, SF2 and SF3 of the other 5ms half frame are all downlink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 7: 1;
in the subframe allocation pattern with the sequence number of 10, the SF0, SF1, SF2 and SF3 of two 5ms half frames are all downlink service subframes; downlink time slot: the configuration ratio of the uplink time slot is 8: 0.
When configuring 2 pairs of switching points in one radio frame, the special areas in the two half frames in the radio frame can be configured independently, that is, the lengths of DwPTS and UpPTS in the two special areas can be unequal, but the lengths of GP in the two half frames should be equal, and the GP length is configured according to the coverage requirement of the base station.
When 1 pair of switching points is configured in a 10ms wireless frame, 4 allocation modes are provided, each allocation mode corresponds to a subframe allocation pattern, as shown in fig. 4, the same representation method as that in fig. 3 is adopted, but for a special area, if no downlink-to-uplink switching point is configured in the special area, the transmission is full downlink transmission, and a vertical line is filled in the same way; and if the special area is configured with the downlink-uplink switching point, filling the special area with dots. The sequence numbers of the subframe assignment patterns in fig. 4 are arranged in sequence according to fig. 3, and the detailed description of the subframe assignment patterns of fig. 4 is given according to the sequence numbers in fig. 4:
in the subframe allocation pattern with the sequence number of 11, the SF0, SF1, SF2 and SF3 of two 5ms half frames are all downlink service subframes; downlink time slot: the configuration proportion of the uplink time slot is 8: 0; a pair of switching points is configured in one half frame;
in a subframe distribution pattern with the sequence number of 12, SF0, SF2 and SF3 of a 5ms half frame are downlink service subframes, SF1 is an uplink service subframe, and a pair of switching points are configured in the half frame; the SF0, SF1, SF2 and SF3 of another 5ms half frame are all downlink service subframes, and no switching point is configured in the half frame; downlink time slot: the configuration ratio of the uplink time slot is 7: 1;
in the subframe distribution pattern with the sequence number of 13, SF0 and SF3 of a 5ms half frame are downlink service subframes, SF1 and SF2 are uplink service subframes, and a pair of switching points are configured in the half frame; the SF0, SF1, SF2 and SF3 of another 5ms half frame are all downlink service subframes, and no switching point is configured in the half frame; downlink time slot: the configuration ratio of the uplink time slot is 6: 2;
in the subframe distribution pattern with the sequence number of 14, SF0 of a 5ms half frame is a downlink service subframe, SF1, SF2 and SF3 are uplink service subframes, and a switching point is not configured in the half frame; the SF0, SF1, SF2 and SF3 of another 5ms half frame are all downlink service subframes, and no switching point is configured in the half frame; downlink time slot: the configuration ratio of the uplink time slot is 5: 3;
when 1 pair of switching points is configured in one radio frame, only one half frame in the radio frame is configured with a pair of switching points, the special area of the radio frame consists of DwPTS, GP and UpPTS, and the length of GP is configured according to the coverage requirement of a base station. The other half frame is configured to be full downlink transmission, all service time slots are downlink time slots, a special area of the downlink time slot only comprises a DwPTS, and the lengths of GP and UpPTS are both 0.
When no switching point is configured in the 10ms radio frame, there are 1 allocation manner corresponding to a subframe allocation pattern, as shown in fig. 5, the same representation method as that in fig. 4 is adopted, and the subframe allocation pattern numbers are arranged according to fig. 4 in sequence, and the following description is made:
in the subframe allocation pattern with the sequence number of 15, the SF0, SF1, SF2 and SF3 of two 5ms half frames are all downlink service subframes; downlink time slot: the configuration proportion of the uplink time slot is 8: 0; no switching point is configured in both half-frames.
When a switching point is not configured in one radio frame, each half frame in the radio frame is configured to be full downlink transmission, all service time slots are downlink time slots, a special area only comprises a DwPTS, and the lengths of GP and UpPTS are 0 and are used for a Multicast Broadcast Single Frequency Network (MBSFN).
When a pair of switching points are configured in one of the radio frames, wherein the switching point from the downlink to the uplink is positioned in the special area GP, and the switching point from the uplink to the downlink is positioned at the boundary of other service subframes except the service subframe # 0; when all four service subframes in one half frame of a radio frame are downlink service subframes, a pair of switching points can be configured or not, when a pair of switching points is configured, a downlink-to-uplink switching point is located in a special area GP, and an uplink-to-downlink switching point is located at the boundary of a service subframe # 1.
When a 10ms radio frame is used as a subframe allocation period, 15 allocation modes of uplink service subframes and downlink service subframes are supported in total, which are expressed as 15 subframe allocation patterns, so that the configuration proportion of uplink time slots and downlink time slots supported in a TDD system reaches seven types, namely, the downlink time slots: the configuration ratios of the uplink time slots are respectively 2:6, 3:5, 4:4, 5:3, 6:2, 7:1 and 8:0, and three more than three types of configuration ratios are adopted when a 5ms half frame is taken as a subframe allocation period, so that the time slot ratio adjustment granularity is changed to 12.5%, the adjustment is more flexible and accurate, and the flexibility of meeting different service requirements is enhanced. The 15 allocation modes of the uplink service subframe and the downlink service subframe support seven allocation ratios of the uplink time slot and the downlink time slot, so that some allocation ratios can adopt various allocation modes. For example, downlink timeslot: when the configuration ratio of the uplink time slot is 7:1, a pair of switching points and two pairs of switching points are correspondingly configured in the radio frame, and each switching point has a distribution mode. Because the delay can be reduced by increasing the logarithm of the switching points, the distribution mode of two pairs of switching points is preferred at a lower delay of the system requirement; because the overhead of GP can be reduced by reducing the logarithm of switching points, when the coverage of the base station required by the system is large, the distribution mode of a pair of switching points is preferred; the specific distribution mode can be flexibly selected according to the actual requirements of the system.
When a 10ms radio frame is used as a subframe allocation period, 15 allocation manners are supported, and the base station may indicate, through a 4-bit signaling, an allocation manner corresponding to a subframe allocation pattern with sequence number 1, for example, 0000, an allocation manner corresponding to a subframe allocation pattern with sequence number 2, and so on, in a broadcast message. Meanwhile, in order to guarantee the search performance of the cell, a primary synchronization signal (P-SCH) of the base station is transmitted once per half frame, specifically in the first OFDM symbol of each DwPTS slot.
Of course, the subframe allocation period is not limited to one radio frame, and the subframe allocation period may be more than one radio frame. For example, when two radio frames are used as a subframe allocation period, the configuration ratio of the corresponding uplink timeslot and downlink timeslot may include 4:12, 5:11, 6:10, 7:9, and the like, and the corresponding timeslot ratio adjustment granularity is 6.25%. The subframe allocation period is at least one wireless frame, so that the purposes of reducing the time slot proportion adjustment granularity and enhancing the flexibility of meeting different service requirements can be achieved.
Based on the above analysis, an embodiment of the present invention provides a subframe allocation method for a TDD system, as shown in fig. 6, including:
s601, determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
a statistical period can be set, and the uplink traffic and the downlink traffic in the cell are counted in the statistical period, so that the proportion of the uplink traffic and the downlink traffic is determined and configured and updated in the base station; of course, the ratio of the uplink traffic volume and the downlink traffic volume required by one system can also be manually set and configured in the base station;
s602, determining the distribution mode of the uplink service subframe and the downlink service subframe in at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
S601 and S602 complete the subframe allocation on the base station side, and to implement communication between the base station and the user equipment, the method further includes the following steps:
s603, broadcasting the indication information of the distribution mode of the uplink service subframe and the downlink service subframe in at least one wireless frame.
The indication information is broadcasted by the base station through a broadcast channel, and if a wireless frame is taken as a subframe allocation period, a 4-bit signaling indication selection allocation mode needs to be adopted.
Preferably, according to the logarithm of the switching points configured in the allocation manner, the delay or the coverage of the base station required by the system can be considered comprehensively, and the optimal allocation manner is selected according to the system requirement, which is specifically divided into two cases:
and when the coverage area of the base station required by the system is greater than or equal to the set first threshold value, determining the allocation mode of configuring a pair of switching points in one of the semi-frames.
And when the time delay required by the system is less than or equal to the set second threshold value, determining the distribution mode of configuring a pair of switching points in each field.
According to the subframe allocation method of the base station side, a subframe allocation method of the TDD system is provided to the user equipment side at the same time, as shown in fig. 7, including:
s701, receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the at least one wireless frame is used as a subframe distribution period;
s702, determining the allocation mode of the uplink service subframe and the downlink service subframe in at least one wireless frame according to the indication information of the allocation mode of the uplink service subframe and the downlink service subframe;
s703, determining the uplink service subframe and the downlink service subframe in at least one wireless frame according to the distribution mode of the uplink service subframe and the downlink service subframe.
In this way, the base station and the user equipment adopt the same frame structure, and can communicate through the configured frame structure.
The embodiment of the present invention provides a subframe allocation apparatus for a TDD system in a base station and a user equipment, respectively, and as shown in fig. 8, the subframe allocation apparatus at the base station side includes:
the configuration ratio determination unit 811: the method comprises the steps of determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
first recipe determination unit 812: and the method is used for determining the allocation mode of the uplink service subframe and the downlink service subframe in at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
In order to enable the base station and the user equipment to adopt the same frame structure, the subframe allocation device on the base station side further comprises:
the instruction information transmitting unit 813: and the indication information is used for broadcasting the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame.
The subframe allocation device on the user equipment side comprises:
the instruction information receiving unit 821: the wireless terminal comprises a wireless frame, a first wireless terminal and a second wireless terminal, wherein the wireless frame is used for receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the wireless frame is used as a subframe distribution period;
second allocation manner determining unit 822: the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame is determined according to the indication information;
the subframe allocation unit 823: and the method is used for determining the uplink service subframe and the downlink service subframe in at least one wireless frame according to the distribution mode of the uplink service subframe and the downlink service subframe.
The subframe allocation scheme of the TDD system provided by the embodiment of the invention can select the allocation mode of the uplink service subframe and the downlink service subframe according to the proportion of the uplink service volume and the downlink service volume, reduce the time slot proportion adjustment granularity and enhance the flexibility of meeting different service requirements;
the scheme comprehensively considers the time delay required by the system and the coverage area of the base station, effectively reduces the cost of GP by selecting the distribution mode of only configuring a pair of switching points under the scene of large coverage area, and effectively controls the time delay of the system by selecting the distribution mode of configuring a pair of switching points in each half frame under the condition of low time delay required by the system.
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 (19)
1. A subframe allocation method of a time division duplex system is characterized by comprising the following steps:
determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
and determining the distribution mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
2. The method of claim 1, further comprising: and broadcasting the indication information of the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame.
3. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 2:6, and (b) a second set of,
according to the above 2:6, in the determined allocation mode of the uplink service subframe and the downlink service subframe in one wireless frame: the first service subframe in each half frame of the wireless frame is a downlink service subframe, and the other three service subframes are uplink service subframes; a pair of switching points is configured within each half-frame.
4. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 3:5, and (c) a further one of,
according to the above 3:5, in the determined allocation mode of the uplink service subframe and the downlink service subframe in a wireless frame: a first service subframe in a half frame of the wireless frame is a downlink service subframe, and the other three service subframes are uplink service subframes; the first service subframe and the fourth service subframe in the other half frame are downlink service subframes, and the other two service subframes are uplink service subframes; a pair of switching points is configured within each half-frame.
5. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 4:4, and (b) a second set of parameters,
according to the 4:4, in a first allocation mode of uplink service subframes and downlink service subframes in a radio frame, the first allocation mode comprises the following steps: the first service subframe and the fourth service subframe in each half frame of the wireless frame are downlink service subframes, and the other two service subframes are uplink service subframes; a pair of switching points is configured in each half frame; or,
according to the 4:4, in a second allocation mode of the uplink service subframe and the downlink service subframe in one wireless frame, the allocation mode comprises the following steps: a first service subframe in a half frame of the wireless frame is a downlink service subframe, and the other three service subframes are uplink service subframes; the second service subframe in the other half frame is an uplink service subframe, and the other three service subframes are downlink service subframes; a pair of switching points is configured within each half-frame.
6. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 5:3, and (b) a second set of parameters,
according to the 5:3, in a first allocation mode of the uplink service subframe and the downlink service subframe in a radio frame, the allocation mode comprises the following steps: all four service subframes in one half frame of the wireless frame are downlink service subframes; the first service subframe in the other half frame is a downlink service subframe, and the other three service subframes are uplink service subframes; a pair of switching points is configured in each half frame; or,
according to the 5:3, in a second allocation mode of the uplink service subframe and the downlink service subframe in one radio frame, the allocation mode comprises the following steps: a second service subframe in a half frame of the wireless frame is an uplink service subframe, and the other three service subframes are downlink service subframes; the first service subframe and the fourth service subframe in the other half frame are downlink service subframes, and the other two service subframes are uplink service subframes; a pair of switching points is configured in each half frame;
according to the 5:3, in a third allocation mode of the uplink service subframe and the downlink service subframe in one radio frame, the allocation mode comprises the following steps: all four service subframes in a half frame of the wireless frame are downlink service subframes, and a switching point is not configured in the half frame; the first service subframe in the other half frame is a downlink service subframe, the other three service subframes are uplink service subframes, and a pair of switching points is configured in the half frame.
7. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 6:2, and (b) a second set of parameters,
according to the 6:2, in a first allocation mode of uplink service subframes and downlink service subframes in a radio frame, which is determined by the method: all four service subframes in one half frame of the wireless frame are downlink service subframes; the first service subframe and the fourth service subframe in the other half frame are downlink service subframes, and the other two service subframes are uplink service subframes; a pair of switching points is configured in each half frame; or,
according to the 6:2, in a second allocation mode of the uplink service subframe and the downlink service subframe in one radio frame, the allocation mode comprises the following steps: the second service subframe in each half frame of the wireless frame is an uplink service subframe, and the other three service subframes are downlink service subframes; a pair of switching points is configured in each half frame; or,
according to the 6:2, in a third allocation mode of the uplink service subframe and the downlink service subframe in one radio frame, the allocation mode comprises the following steps: all four service subframes in a half frame of the wireless frame are downlink service subframes, and a switching point is not configured in the half frame; the first service subframe and the fourth service subframe in the other half frame are downlink service subframes, the other two service subframes are uplink service subframes, and a pair of switching points is configured in the half frame.
8. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 7:1, and (b) a second set of one or more of,
according to the 7:1, in a first allocation mode of uplink service subframes and downlink service subframes in a radio frame, which is determined by the method: all four service subframes in one half frame of the wireless frame are downlink service subframes; the second service subframe in the other half frame is an uplink service subframe, and the other three service subframes are downlink service subframes; a pair of switching points is configured in each half frame;
according to the 7:1, in a second allocation mode of uplink service subframes and downlink service subframes in a radio frame, the method comprises the following steps: all four service subframes in one half frame of the wireless frame are downlink service subframes, and no switching point is configured in the half frame; the second service subframe in the other half frame is an uplink service subframe, the other three service subframes are downlink service subframes, and a pair of switching points is configured in the half frame.
9. The method of claim 1, wherein the allocating ratio of the uplink timeslot and the downlink timeslot when a subframe is allocated with one radio frame comprises: downlink time slot: the uplink time slot is 8:0, and (c) is selected from the group consisting of,
according to the 8:0, in a first allocation mode of an uplink service subframe and a downlink service subframe in a radio frame, the allocation mode comprises the following steps: all four service subframes in each half frame of the wireless frame are downlink service subframes; a pair of switching points is configured in each half frame; or,
according to the 8:0 in a second allocation mode of uplink service subframes and downlink service subframes in a radio frame, the allocation mode comprises the following steps: all four service subframes in each half frame of the wireless frame are downlink service subframes; a pair of switching points is configured in one half frame; or,
according to the 8:0, in a third allocation mode of the uplink service subframe and the downlink service subframe in one wireless frame, the allocation mode comprises the following steps: and all four service subframes in each half frame of the wireless frame are downlink service subframes, and no switching point is configured in each half frame.
10. The method according to any of claims 1 to 9, wherein when a pair of switching points is configured in a half frame of a radio frame, the special area in the half frame is composed of downlink pilot time slot, downlink-to-uplink guard interval and uplink pilot time slot; when no switching point is configured in one half of the radio frame, the special area consists of downlink pilot time slots.
11. The method according to any of claims 1 to 9, characterized in that the ratio of the uplink traffic and the downlink traffic is updated according to the uplink traffic and the downlink traffic which are periodically counted.
12. The method as claimed in any one of claims 6 to 8, wherein when the coverage area of the base station required by the system is greater than or equal to the set first threshold, the allocation manner of a pair of switching points configured in one of the half-frames is determined.
13. The method according to any one of claims 6 to 8, wherein when the delay of the system requirement is less than or equal to the second threshold, determining the allocation mode for configuring a pair of switching points in each field.
14. A subframe assignment device for a time division duplex system, comprising:
a configuration ratio determination unit: the method comprises the steps of determining the configuration proportion of an uplink time slot and a downlink time slot when at least one wireless frame is used as a subframe allocation period according to the proportion of the uplink traffic and the downlink traffic;
a first recipe determination unit: and the method is used for determining the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame according to the configuration proportion of the uplink time slot and the downlink time slot.
15. The apparatus of claim 14, wherein the apparatus further comprises:
an instruction information transmitting unit: and the indication information is used for broadcasting the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame.
16. A base station, characterized in that it comprises the apparatus of claim 14 or 15.
17. A subframe allocation method of a time division duplex system is characterized by comprising the following steps:
receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the at least one wireless frame is taken as a subframe distribution period;
determining the distribution mode of an uplink service subframe and a downlink service subframe in the at least one wireless frame according to the indication information;
and determining an uplink service subframe and a downlink service subframe in the at least one radio frame according to the distribution mode.
18. A subframe assignment device for a time division duplex system, comprising:
an instruction information receiving unit: the wireless terminal comprises a wireless frame, a first wireless terminal and a second wireless terminal, wherein the wireless frame is used for receiving indication information of an uplink service subframe and a downlink service subframe distribution mode in at least one wireless frame when the wireless frame is used as a subframe distribution period;
a second allocation method determination unit: the allocation mode of the uplink service subframe and the downlink service subframe in the at least one wireless frame is determined according to the indication information;
a subframe allocation unit: and the method is used for determining the uplink service subframe and the downlink service subframe in the at least one radio frame according to the distribution mode.
19. A user equipment, characterized in that it comprises the apparatus of claim 18.
Priority Applications (7)
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|---|---|---|---|
| CN200710177030A CN101431362B (en) | 2007-11-08 | 2007-11-08 | Subframe distribution method and apparatus for TDD system |
| JP2010531402A JP2011502410A (en) | 2007-11-02 | 2008-11-03 | Method and apparatus for determining radio frame structure of time division duplex system |
| KR1020107012196A KR101110203B1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| EP08857870.3A EP2234292B1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| PCT/CN2008/001840 WO2009070964A1 (en) | 2007-11-02 | 2008-11-03 | A method and an apparatus for determining the radio frame structure of time division duplex system |
| US12/740,972 US8472465B2 (en) | 2007-11-02 | 2008-11-03 | Method and an apparatus for determining the radio frame structure of time division duplex system |
| JP2013046925A JP5542225B2 (en) | 2007-11-02 | 2013-03-08 | Method and apparatus for determining radio frame structure of time division duplex system |
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