CN101400128A - Method and device for wireless timeslot allocation in time division duplexing mobile communication system - Google Patents
Method and device for wireless timeslot allocation in time division duplexing mobile communication system Download PDFInfo
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- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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Abstract
The invention discloses a method of a wireless frame up and down time slot distribution in a time division duplexing mobile communication system, wherein 10 ms is a period, each time slot in the period is ensured as an up transmitting time slot or a down transmitting time slot, up or downtransmission is completed in corresponding time slot. The invention also discloses a device of a wireless frame up and down time slot distribution in a time division duplexing mobile communication system, according to the method and the device of the invention , scale types of the time slot is enriched, causing the scale adjustment of the time slot to be more agile and precise.
Description
Technical Field
The present invention relates to a time slot allocation technique in a wireless frame, and more particularly, to a method and apparatus for allocating uplink and downlink time slots of a wireless frame in a tdd mobile communication system.
Background
In a long term evolution time division duplex (LTE TDD) system, two modes are currently included: type1 TDD and Type2 TDD, wherein, Type2 TDD is time division-synchronous code division multiple access (TD-SCDMA) evolution technology. In LTE, a low chip rate-time division duplex (LCR-TDD) frame structure has been written as a standard for LTE tdtype 2 frame structures.
As shown in fig. 1, in the LTE TDD Type2 Frame structure, each 10ms Radio Frame (Radio Frame) is divided into two identical 5ms Half-frames (Half-frames), each Half-Frame is composed of seven regular time slots (timeslots) and three special time slots, and each regular time slot is composed of a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. Three special time slots are DwPTS, UpPTS and GP, wherein the DwPTS is a downlink pilot time slot and is used for sending downlink synchronous signals; the UpPTS is an uplink pilot time slot and is used for uplink random access; the GP is a guard interval when downlink transmission is switched to uplink transmission. In the conventional timeslot, TS0 is always used for downlink transmission, and TS1 is always used for uplink transmission, that is, TS0 is fixed as a downlink timeslot, TS1 is fixed as an uplink timeslot, and the rest of timeslots can be flexibly configured as uplink or downlink timeslots.
Since the transmission direction of the TS2 to the TS6 in each half frame is configurable, in practical application, the requirements of different service types can be met by flexibly allocating and adjusting the proportion of uplink and downlink timeslots. However, for the LTE TDD Type2 frame structure shown in fig. 1, since the 10ms radio frame is divided into two identical 5ms fields, the adjustment of the uplink and downlink timeslot proportion can only be performed in a field, and is repeated with a period of 5ms, as shown in fig. 2. In fig. 2, the time slots filled with dots are downlink time slots, the time slots filled with horizontal lines are uplink time slots, and the time slots filled with oblique lines are three special time slots. As can be seen from fig. 2, in the timeslot proportion allocation manner with a period of 5ms, at most 6 different uplink and downlink timeslot proportions can be supported, as shown in table one, where DL represents a downlink timeslot, UL represents an uplink timeslot, and the minimum granularity of timeslot proportion adjustment is 14%, that is, 1/7.
| |
1 | 2 | 3 | 4 | 5 | 6 |
| DL: |
1∶6 | 2:5 | 3:4 | 4:3 | 5:2 | 6:1 |
Watch 1
Obviously, in the existing LTE TDD Type2 frame structure, when the 5ms half frame is used as the period for uplink and downlink timeslot allocation, at most, 6 different uplink and downlink timeslot proportions can be supported, the minimum granularity for timeslot proportion adjustment is 14%, the timeslot proportion types are not rich enough, the adjustment is not flexible and accurate enough, it is difficult to meet the needs of multiple service types, and the advantages of the TDD technology are not fully exerted.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for allocating uplink and downlink timeslots of a radio frame in a tdd mobile communication system, which can enrich the timeslot proportion types and make timeslot proportion adjustment more flexible and accurate.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for allocating wireless frame uplink and downlink time slots in a time division duplex mobile communication system, which takes 10ms as a period, determines each time slot in the period as an uplink transmission time slot or a downlink transmission time slot, and completes uplink or downlink transmission in the corresponding time slot when communication is carried out.
The method further comprises the following steps: the currently employed slot allocation scheme is selected from all the alternative slot allocation schemes and indicated in the broadcast channel.
Wherein the all selectable slot allocation schemes comprise: a time slot distribution scheme corresponding to two pairs of switching points in a 10ms period, a time slot distribution scheme corresponding to a pair of switching points in a 10ms period and a time slot distribution scheme corresponding to no switching point in a 10ms period;
alternatively, the all selectable slot allocation schemes include: and a time slot distribution scheme corresponding to two pairs of switching points in the 10ms period and a time slot distribution scheme corresponding to no switching point in the 10ms period.
In the above scheme, there are two pairs of switching points in the 10ms period, one pair of switching points in each 5ms half frame, the downlink-to-uplink switching is completed by GP, and the uplink-to-downlink switching is completed between any two adjacent time slots after TS1 in each 5ms half frame.
A pair of switching points in the 10ms period is switched from downlink to uplink by the GP of the first 5ms half frame, and the switching from uplink to downlink is positioned between any two adjacent time slots after the TS1 of the first 5ms half frame and before the TS0 of the second 5ms half frame; or, the downlink-uplink switching is completed by the GP of the first 5ms field, and the uplink-downlink switching is located between any two adjacent time slots after the TS1 of the first 5ms field and at the end of the 10ms radio frame.
In the above scheme, the indication is indication using 6bits signaling, or indication using 5bits signaling, or indication using 4bits signaling, or indication using 3bits signaling.
In the scheme, a first specific time slot and a second specific time slot are respectively arranged between a first time slot and a second time slot of a first 5ms half frame and between a first time slot and a second time slot of a second 5ms half frame in a 10ms period, and the duration of each specific time slot is 275 us.
In the above scheme, the specific time slot consists of three special time slots, namely DwPTS, UpPTS and GP; or the system consists of DwPTS and short time slot which can transmit downlink control signaling or service data and has the duration of 191.66 us; or a short time slot with the duration of 275us and capable of carrying out uplink/downlink data or control signaling transmission.
The method further comprises the following steps: and determining an optional time slot allocation scheme according to a certain principle according to different signaling indication bit numbers.
In the above scheme, the number of signaling indication bits is 6bits, and the certain principle is: and reserving all time slot allocation schemes of two pairs of switching points, one pair of switching points and no switching point in a 10ms period as optional time slot allocation schemes. The signaling indication bit number is 5bits, and the certain principle is as follows: reserving all time slot allocation schemes of a 5ms allocation period; reserving all time slot allocation schemes when no switching point and a pair of switching points exist in a 10ms allocation period; and on the premise of keeping all the time slot ratios, carrying out redundancy deletion on the time slot allocation scheme supporting the same time slot ratio. The signaling indication bit number is 4bits, and the certain principle is as follows: reserving all time slot allocation schemes of a 5ms allocation period; reserving a time slot allocation scheme without a switching point in a 10ms allocation period; for the time slot allocation scheme with two pairs of switching points and one pair of switching points in the 10ms period, on the premise of keeping all the time slot ratios, redundancy deletion is carried out on the time slot allocation scheme supporting the same time slot ratio. The signaling indication bit number is 4bits, and the certain principle is as follows: reserving all time slot allocation schemes of a 5ms allocation period; a slot allocation scheme without a switching point within a 10ms allocation period is reserved.
The method further comprises the following steps: setting an indication that the DwPTS is sent twice or once within a 10ms period.
The invention also provides a device for allocating the uplink and downlink time slots of the wireless frame in the time division duplex mobile communication system, which comprises an allocation scheme selection module, a time slot allocation module and a transceiver module, wherein,
the allocation scheme selection module is used for determining the currently adopted time slot allocation mode, determining all selectable time slot allocation schemes corresponding to the mode according to the determined time slot allocation mode, selecting the currently used time slot allocation scheme and sending the selected time slot allocation scheme to the time slot allocation module;
the time slot distribution module determines each time slot in the 10ms period as an uplink transmission time slot or a downlink transmission time slot according to the received time slot distribution scheme, and divides the uplink and downlink transmission time slots in the 10ms period to inform the transceiver module;
and the transceiver module is used for carrying out uplink or downlink transmission in the corresponding time slot when carrying out communication according to the divided uplink and downlink transmission time slots.
The device further comprises an allocation indication generating module, which is used for determining the bit number used by the indication time slot allocation scheme and sending the determined indication bit number to the allocation scheme selecting module; correspondingly, the allocation scheme selection module further determines all current selectable time slot allocation schemes according to the determined time slot allocation mode and the received indication bit number, and then selects the current used time slot allocation scheme from the current selectable time slot allocation schemes and sends the selected time slot allocation scheme to the time slot allocation module. Wherein the number of bits is any one of 3 to 6 bits.
In the above scheme, the timeslot allocation mode is as follows: two pairs of switching points exist in the 10ms period, or one pair of switching points exist in the 10ms period, or no switching point exists in the 10ms period.
In the above solution, the apparatus may further include a DwPTS indicating module for indicating that the DwPTS is transmitted once or twice within the 10ms period.
The method and the device for allocating the uplink and downlink time slots of the wireless frame in the time division duplex mobile communication system adopt the idea of dividing the uplink or downlink transmission time slots by taking 10ms as a period, expand the combination of the uplink and downlink transmission time slots and increase the selection range of a time slot allocation scheme, thereby providing richer uplink and downlink time slot proportion types, ensuring that the adjustment of the time slot proportion is more flexible and accurate, meeting the requirements of various service types and giving play to the advantages of the TDD technology to a greater extent.
The invention also provides various optional time slot allocation schemes when the time slot allocation schemes are indicated by adopting different bit numbers, so that users can adopt different time slot allocation schemes according to requirements, the application is more flexible and convenient, the application range is wider, and when fewer bit indications are adopted, the broadcast channel resources can be saved to a certain extent.
Drawings
Fig. 1 is a schematic diagram of a structure of an LTE TDD Type2 frame;
fig. 2 is a schematic diagram of the proportional allocation of uplink and downlink timeslots with a period of 5ms in the prior art;
FIGS. 3 a-3 f are schematic diagrams of the slot ratio distribution with a period of 10ms and two pairs of switching points in the period;
FIG. 4 is a diagram of a frame structure with a 10ms period and a pair of switch points in the period;
fig. 5 is a schematic diagram of the proportional allocation of uplink and downlink timeslots based on the frame structure shown in fig. 4;
FIG. 6 is a schematic diagram of another frame structure with a 10ms period and a pair of switch points in the period;
fig. 7 is a schematic diagram of the proportional allocation of uplink and downlink timeslots based on the frame structure shown in fig. 6;
FIG. 8 is a diagram of a frame structure with a period of 10ms and no switching point in the period;
fig. 9 is a schematic diagram of the proportional allocation of uplink and downlink timeslots based on the frame structure shown in fig. 8;
fig. 10a to 10c are schematic diagrams of uplink and downlink timeslot proportion allocation in the first optimization scheme;
fig. 11 is a schematic diagram of the proportional allocation of uplink and downlink timeslots in the second optimization scheme;
fig. 12 is a schematic diagram of uplink and downlink timeslot proportion allocation in the third optimization scheme.
Detailed Description
The core idea of the invention is as follows: and determining each time slot in the period as an uplink transmission time slot or a downlink transmission time slot by taking the 10ms wireless frame as the period, and finishing uplink or downlink transmission in the corresponding time slot when communication is carried out. Further, all current selectable time slot allocation schemes are determined, the time slot allocation scheme to be adopted currently is selected, and the currently adopted time slot allocation scheme is indicated in the broadcast channel.
In each 10ms wireless frame, the first time slot of the first 5ms half frame is always kept as a downlink transmission time slot, a first specific time slot and a second specific time slot are respectively arranged between the first time slot and the second time slot of the first 5ms half frame and between the first time slot and the second time slot of the second 5ms half frame, and the duration of each specific time slot is 275 us. There are three possible ways of forming each specific timeslot: first, the specific timeslot includes three special timeslots DwPTS, UpPTS and GP, as in the prior art; secondly, the specific time slot comprises a special time slot DwPTS and a short time slot which can transmit downlink control signaling or service data, and the time length of the short time slot is 191.66 us; thirdly, the specific time slot is a short time slot capable of performing uplink/downlink data or control signaling transmission, and the duration of the short time slot is 275 us. In practical applications, the first specific time slot and the second specific time slot may optionally have one of the three compositions, and the compositions of the two specific time slots may be the same or different.
In the invention, three time slot distribution modes exist in a 10ms period according to the different numbers of the switching points, and each time slot distribution mode corresponds to one or more time slot distribution schemes, so that all current optional time slot distribution schemes can be determined according to the different numbers of the switching points. Specifically, the method comprises the following steps:
the first slot allocation mode is a mode in which there are two pairs of switching points in a 10ms period, and the frame structure used in this mode is the same as that of the prior art, and the slot composition of each 5ms half frame is as shown in fig. 1. Within each 5ms half-frame there is a pair of switching points, namely a down-to-up switching point DUSP and an up-to-down switching point UDSP, where down-to-up switching is done by GP, while up-to-down switching can be done between any two adjacent time slots after TS1 within the respective 5ms half-frame, and in particular there may be no UDSP within the respective 5ms half-frame, i.e. TS1 to TS6 are all uplink transmission time slots, the switching point positions shown in fig. 1 being only illustrative of one case.
The second slot allocation pattern has a pair of switching points within a 10ms period, and in this way, the frame structure shown in fig. 4 or the frame structure shown in fig. 6 can be adopted. When different frame structures are adopted, the downlink-to-uplink switching is completed through the GP of the first 5ms half frame, and the uplink-to-downlink switching can be at different positions and can be located between any two adjacent time slots from the TS1 of the first 5ms half frame to the TS0 of the second 5ms half frame, where the position of the switching point shown in fig. 4 is only an illustration of one case; or between any two adjacent timeslots from the TS1 of the first 5ms half frame to the end of the 10ms radio frame, and specifically, there may be no UDSP, that is, the TS1 of the first 5ms half frame in the 10ms radio frame and all timeslots thereafter are uplink transmission timeslots, and the position of the switching point shown in fig. 6 is only an illustration of one case.
The third timeslot allocation mode is no switching point in a 10ms period, and the frame structure adopted in this way is shown in fig. 8.
In the first and second time slot allocation modes, a plurality of different time slot allocation schemes correspond to different uplink and downlink time slot allocation proportions.
When the broadcast channel indicates the currently adopted time slot allocation scheme, the invention can adopt signaling indication with different bits, such as: using a 6bits signaling indication, or using a 5bits signaling indication, or using a 4bits signaling indication, or using a 3bits signaling indication. The number of bits used varies, as does the number of slot allocation schemes that can be indicated.
Currently, there are at most 50 alternative slot allocation schemes, and to indicate all possible slot allocation schemes, a 6bits signaling indication is used, which can indicate all 50 alternative slot allocation schemes. If other bit numbers are used for indicating, because the number of the time slot allocation schemes which can be indicated is limited, the specific time slot allocation scheme needs to be further optimized according to the uplink and downlink time slot allocation proportion according to the difference of the signaling indication bit numbers, wherein, the 5bits signaling indication is used for indicating 32 optional time slot allocation schemes corresponding to the first optimization scheme; using 4bits signaling indication to correspond to the second optimization scheme, indicating 14 optional time slot allocation schemes; the 3bits signaling indication is used to indicate the corresponding third optimization scheme, and 7 optional time slot allocation schemes are indicated.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and specific embodiments. Wherein, the first to fourth embodiments mainly provide all timeslot allocation schemes supported under different timeslot allocation modes; from the signaling indication perspective, the fifth to eighth embodiments provide all optional timeslot allocation schemes supported by different indicated bit numbers in practical application, where each indicated bit number is a unified indication of the situation that there are two pairs of switching points, one pair of switching points, and no switching point within a 10ms period.
The first embodiment is as follows:
in this embodiment, the first specific time slot and the second specific time slot are both composed of three special time slots; the time slot distribution mode adopts a mode that two pairs of switching points exist within 10 ms.
In this way, in a 10ms period, the first time slot in each 5ms is fixed as a downlink transmission time slot, the second time slot is fixed as an uplink transmission time slot, and the rest time slots are all arbitrarily set as uplink transmission time slots or downlink transmission time slots.
The frame structure adopted in this embodiment is consistent with the prior art, and the specific timeslot allocation scheme formed in this embodiment is as shown in fig. 3a to 3f, and includes 36 types, and supports 11 uplink and downlink timeslot ratios corresponding to different timeslot patterns, as shown in table two.
| Number of |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Time slot ratio | 2:12 | 3:11 | 4:10 | 5:9 | 6:8 | 7:7 | 8:6 | 9:5 | 10:4 | 11:3 | 12:2 |
Watch two
It can be seen that five time slot proportions are newly added compared with the table, and meanwhile, the time slot proportion adjustment granularity is changed from 14% to 7%, namely 1/14, the time slot proportion type is richer and the adjustment is more accurate.
Example two:
in this embodiment, the first specific time slot is composed of three special time slots, the second specific time slot is composed of DwPTS and short time slot capable of transmitting downlink control signaling or service data, and the duration of the short time slot is 191.66 us; the slot allocation mode adopts a mode that a pair of switching points exist within 10 ms.
In this way, within a 10ms period, the first time slot in the first 5ms is fixed as a downlink transmission time slot, the second time slot is fixed as an uplink transmission time slot, all time slots in the second 5ms are downlink transmission time slots, and the rest time slots are arbitrarily set as uplink transmission time slots or downlink transmission time slots.
In the present embodiment, the frame structure shown in fig. 4 is used, and DwPTS is transmitted twice within 10 ms. The specific timeslot allocation scheme formed in this embodiment is shown in fig. 5, and includes 7 types, and supports 7 uplink and downlink timeslot ratios corresponding to different timeslot patterns, as shown in table three.
| Number of |
1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Time slot ratio | 13:1 | 12:2 | 11:3 | 10:4 | 9:5 | 8:6 | 7:7 |
Watch III
It can be seen that the slot ratio adjustment granularity in this embodiment is 7%, i.e., 1/14, where the calculated ratio is such that the newly added short slots are not included.
Example three:
in this embodiment, the first specific time slot is composed of three special time slots, the second specific time slot is a short time slot capable of performing uplink/downlink data or control signaling transmission, and the duration of the short time slot is 275 us; the slot allocation mode adopts a mode that a pair of switching points exist within 10 ms.
In this way, within a 10ms period, the first time slot in the first 5ms is fixed as a downlink transmission time slot, the second time slot is fixed as an uplink transmission time slot, and all the other time slots are arbitrarily set as uplink transmission time slots or downlink transmission time slots.
In the present embodiment, the frame structure shown in fig. 6 is used, and DwPTS is transmitted only once within 10 ms. The specific timeslot allocation scheme formed in this embodiment is shown in fig. 7, and includes 13 types, and supports 13 uplink and downlink timeslot ratios corresponding to different timeslot patterns, as shown in table four.
| Number of |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Time slot ratio | 13:1 | 12:2 | 11:3 | 10:4 | 9:5 | 8:6 | 7:7 | 6:8 | 5:9 | 4:10 | 3:11 | 2:12 | 1:13 |
Watch four
It can be seen that, in this embodiment, at most 13 uplink and downlink timeslot ratios can be supported in a wireless frame of 10ms, which are two more than in the first embodiment, and the timeslot ratio adjustment granularity is 7%, that is, 1/14, where the calculated ratio is not to include the newly added short timeslot.
In the second and third embodiments, whether the DwPTS is transmitted twice or once in a 10ms period may be set in advance on the base station side and indicated by a separate signaling.
Example four:
in this embodiment, the first specific time slot and the second specific time slot are both short time slots capable of performing downlink data or control signaling transmission, and the duration of the short time slot is 275 us; the time slot distribution mode adopts a mode without a switching point within 10 ms; a 6bits signaling indication is used on the broadcast channel. In this way, all the time slots within the 10ms period are downlink transmission time slots, including two newly added short time slots, which are also downlink transmission time slots.
The frame structure shown in fig. 8 is adopted in this embodiment, and such a frame structure is generally applied to an enhanced multimedia broadcast multicast service (E-MBMS) service of an independent carrier. The specific time slot allocation scheme formed by the present embodiment is shown in fig. 9.
Example five:
in this embodiment, the broadcast channel uses 6bits signaling indication, since 2 bits664 indicates 64 scenarios, so in this example 10ms weeks remainAll 50 time slot allocation schemes of two pairs of switching points, one pair of switching points and no switching point in the period are taken as selectable time slot allocation schemes, and the method specifically comprises the following steps: 36 time slot allocation schemes of two pairs of switching points in a 10ms period are shown in fig. 3a to 3 f; a slot allocation scheme 13 for a pair of switching points in a 10ms period, as shown in fig. 7; slot allocation scheme 1 without switching point in 10ms period is shown in fig. 9.
That is, when the broadcast channel uses the 6bits signaling indication, any one of the 50 slot allocation schemes is supported and indicated.
Example six:
in this embodiment, the broadcast channel uses 5bits signaling indication, since 2 bits5Only 32 schemes can be indicated, so the 50 slot allocation schemes given in example five need to be optimized.
The embodiment is a first optimization scheme in practical application, and the specific optimization principle is as follows: and reserving all time slot allocation schemes of a 5ms allocation period, reserving all downlink time slot allocation schemes, reserving all time slot allocation schemes when a pair of switching points exist in a 10ms allocation period, and simultaneously, on the premise of keeping all time slot ratios, performing redundancy deletion on the condition that multiple time slot allocation schemes support the same time slot ratio.
Specifically, as shown in fig. 10, 32 slot allocation schemes are reserved as the alternative slot allocation schemes. The method comprises three parts which are respectively represented by figures 10a to 10c, wherein 18 time slot allocation schemes of two pairs of switching points in a 10ms period are included in figure 10a and indicated by reference numerals (1) to (18), six time slot allocation schemes with reference numerals (1), (3), (7), (11), (15) and (18) in figure 10a are the same as the time slot allocation scheme of a 5ms allocation period, and the rest 12 time slot allocation schemes are newly added in the 10ms allocation period; fig. 10b includes 13 slot allocation schemes for a pair of switching points within a 10ms period, indicated by reference numerals (19) to (31); fig. 10c includes slot allocation scheme 1 without switching points for a 10ms period, indicated by reference numeral (32).
That is, when the broadcast channel uses the 5bits signaling indication, an optional one of 32 slot allocation schemes is supported and indicated.
Example seven:
in this embodiment, the broadcast channel uses 4bits signaling indication, since 2 bits4Only 16 schemes can be indicated, so that further optimization of the 32 slot allocation schemes given in the sixth embodiment is required.
The embodiment is a second optimization scheme in practical application, and the specific optimization principle is as follows: and reserving all time slot allocation schemes of a 5ms allocation period, reserving all downlink time slot allocation schemes, and simultaneously, carrying out redundancy deletion on the condition that multiple time slot allocation schemes support the same time slot proportion on the premise of keeping all time slot proportions.
Specifically, as shown in fig. 11, 14 slot allocation schemes are reserved as the alternative slot allocation schemes. Wherein, 11 time slot allocation schemes of two pairs of switching points in the 10ms period are indicated by reference numbers (1), (2), (3), (6), (7), (10), (11), (14), (15), (17) and (18), the six time slot allocation schemes with the reference numbers (1), (3), (7), (11), (15) and (18) are the same as the time slot allocation scheme of the 5ms allocation period, and the other 5 time slot allocation schemes are newly added in the 10ms allocation period; 4 slot allocation schemes for a pair of switching points within a 10ms period, indicated by reference numerals (19), (23), (27), (31); slot allocation scheme 1 without switching points for a 10ms period is indicated by reference numeral (32), which is used in fig. 11 and is identical to that in fig. 10.
That is, when the broadcast channel uses the 4bits signaling indication, any one of the 14 slot allocation schemes is supported and indicated.
Example eight:
in this embodiment, the broadcast channel uses 3bits signaling indication, since 2 bits signaling indication3Only 8 schemes can be indicated, so that a further optimization of the 16 slot allocation schemes given in example seven is required.
The embodiment is a third optimization scheme in practical application, and the specific optimization principle is as follows: all slot allocation schemes of 5ms allocation periods are reserved, and all downlink slot allocation schemes are reserved.
Specifically, as shown in fig. 12, 7 slot allocation schemes are reserved as the alternative slot allocation schemes. Wherein, 6 time slot allocation schemes of two pairs of switching points in the 10ms period are indicated by the labels (1), (3), (7), (11), (15) and (18), and the six time slot allocation schemes are the same as the time slot allocation scheme of the 5ms allocation period; slot allocation scheme 1 without switching points for a 10ms period is indicated by reference numeral (32), which is used in fig. 12 and is identical to that in fig. 10.
That is, when the broadcast channel uses the 3bits signaling indication, one of the 7 slot allocation schemes is supported to be selected and indicated.
In order to realize the method, the invention also provides a device for allocating the uplink and downlink time slots of the wireless frame in the time division duplex mobile communication system, which at least comprises an allocation scheme selection module, a time slot allocation module and a transceiver module.
The allocation scheme selection module is used for determining a currently adopted time slot allocation mode, namely: two pairs of switching points exist in the 10ms period, or one pair of switching points exist in the 10ms period, or no switching point exists in the 10ms period, all selectable time slot allocation schemes corresponding to the mode are determined according to the determined time slot allocation mode, and the currently used time slot allocation scheme is selected and sent to the time slot allocation module. Here, all selectable time slot allocation schemes corresponding to different time slot allocation modes may be listed in advance, and after the currently adopted time slot allocation mode is determined, all corresponding time slot allocation schemes may be directly obtained according to the corresponding relationship. Such as: two pairs of switching points in a 10ms period correspond to 36 time slot allocation schemes, one pair of switching points correspond to 13 time slot allocation schemes, and no switching point corresponds to 1 time slot allocation scheme.
The time slot distribution module determines each time slot in the 10ms period as an uplink transmission time slot or a downlink transmission time slot according to the received time slot distribution scheme, and then divides the uplink and downlink transmission time slots in the 10ms period to inform the transceiver module.
And the transceiver module transmits uplink or downlink service data or downlink control signaling in the corresponding time slot when performing communication according to the divided uplink and downlink transmission time slots.
The device may further include an allocation indication generating module, configured to determine a bit number used by the indication timeslot allocation scheme, where the bit number may be any one of 3-6 bits, and after the indication bit number is determined, the allocation indication generating module sends the determined indication bit number to the allocation scheme selecting module.
The allocation scheme selection module further combines the determined time slot allocation mode and the received indication bit number to determine all current selectable time slot allocation schemes, and then selects the current used time slot allocation scheme from the time slot allocation schemes and sends the selected time slot allocation scheme to the time slot allocation module. Here, all selectable time slot allocation schemes corresponding to different time slot allocation modes and different indicated bit numbers may be listed in advance, and after the currently used time slot allocation mode and the indicated bit number are determined, all corresponding time slot allocation schemes may be directly obtained according to the correspondence, and then the currently used time slot allocation scheme may be selected from them. Such as: when the 6bits indicates, 50 time slot allocation schemes are corresponding, including 36 time slot allocation schemes in two pairs of switching point modes in a 10ms period, 13 time slot allocation schemes in a pair of switching point modes, and 1 time slot allocation scheme in a mode without a switching point; the 5bits indication corresponds to 32 time slot allocation schemes, including 18 time slot allocation schemes in two pairs of switching point modes within a 10ms period, 13 time slot allocation schemes in a pair of switching point modes, 1 time slot allocation scheme in a mode without a switching point, and the like.
When the device does not comprise an allocation indication generating module, the bit number used by the default indication time slot allocation scheme is 6.
The apparatus may further include a DwPTS indicating module for indicating whether to transmit the DwPTS once or twice when there is only one pair of switching points in the 10ms period.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (19)
1. A method for distributing up and down time slots of radio frame in time division duplex mobile communication system is characterized by that it uses 10ms as period, and determines each time slot in the period as up transmission time slot or down transmission time slot, and when making communication, it can implement up or down transmission in correspondent time slot.
2. The method of claim 1, further comprising: the currently employed slot allocation scheme is selected from all the alternative slot allocation schemes and indicated in the broadcast channel.
3. The method of claim 2, wherein the all selectable slot allocation schemes comprise: a time slot distribution scheme corresponding to two pairs of switching points in a 10ms period, a time slot distribution scheme corresponding to a pair of switching points in a 10ms period and a time slot distribution scheme corresponding to no switching point in a 10ms period; or,
the all selectable slot allocation schemes include: and a time slot distribution scheme corresponding to two pairs of switching points in the 10ms period and a time slot distribution scheme corresponding to no switching point in the 10ms period.
4. The method of claim 3, wherein there are two pairs of switching points within the 10ms period, one pair for each 5ms half-frame, wherein downlink to uplink switching is accomplished via the GP, and wherein uplink to downlink switching is accomplished between any two adjacent timeslots after TS1 within each 5ms half-frame.
5. The method of claim 3, wherein a pair of switching points in the 10ms period is switched from downlink to uplink by the GP of the first 5ms half frame, and the switching from uplink to downlink is performed between any two adjacent timeslots from the TS1 of the first 5ms half frame to the TS0 of the second 5ms half frame; or,
the downlink-uplink switching is completed by the GP of the first 5ms half frame, and the uplink-downlink switching is positioned between any two adjacent time slots after the TS1 of the first 5ms half frame and at the end of the 10ms radio frame.
6. The method according to any of claims 2 to 5, wherein the indication is a use of 6bits signaling indication, or a use of 5bits signaling indication, or a use of 4bits signaling indication, or a use of 3bits signaling indication.
7. A method according to any one of claims 1 to 5, characterized in that a first specific slot and a second specific slot are provided between the first slot and the second slot of the first 5ms field and between the first slot and the second slot of the second 5ms field, respectively, within a 10ms period, each specific slot having a duration of 275 us.
8. The method of claim 7, wherein the specific timeslot consists of three special timeslots DwPTS, UpPTS and GP; or the system consists of DwPTS and short time slot which can transmit downlink control signaling or service data and has the duration of 191.66 us; or a short time slot with the duration of 275us and capable of carrying out uplink/downlink data or control signaling transmission.
9. The method of any one of claims 2 to 5, further comprising: and determining an optional time slot allocation scheme according to a certain principle according to different signaling indication bit numbers.
10. The method according to claim 9, wherein the signaling indication bit number is 6bits, and the certain rule is: and reserving all time slot allocation schemes of two pairs of switching points, one pair of switching points and no switching point in a 10ms period as optional time slot allocation schemes.
11. The method according to claim 9, wherein the number of signaling indication bits is 5bits, and the certain rule is: reserving all time slot allocation schemes of a 5ms allocation period; reserving all time slot allocation schemes when no switching point and a pair of switching points exist in a 10ms allocation period; and on the premise of keeping all the time slot ratios, carrying out redundancy deletion on the time slot allocation scheme supporting the same time slot ratio.
12. The method according to claim 9, wherein the signaling indication bit number is 4bits, and the certain rule is: reserving all time slot allocation schemes of a 5ms allocation period; reserving a time slot allocation scheme without a switching point in a 10ms allocation period; for the time slot allocation scheme with two pairs of switching points and one pair of switching points in the 10ms period, on the premise of keeping all the time slot ratios, redundancy deletion is carried out on the time slot allocation scheme supporting the same time slot ratio.
13. The method according to claim 9, wherein the signaling indication bit number is 4bits, and the certain rule is: reserving all time slot allocation schemes of a 5ms allocation period; a slot allocation scheme without a switching point within a 10ms allocation period is reserved.
14. A method according to claim 1 or 2, characterized in that the method further comprises: setting an indication that the DwPTS is sent twice or once within a 10ms period.
15. A device for allocating wireless frame uplink and downlink time slots in a time division duplex mobile communication system is characterized by comprising an allocation scheme selection module, a time slot allocation module and a transceiver module, wherein,
the allocation scheme selection module is used for determining the currently adopted time slot allocation mode, determining all selectable time slot allocation schemes corresponding to the mode according to the determined time slot allocation mode, selecting the currently used time slot allocation scheme and sending the selected time slot allocation scheme to the time slot allocation module;
the time slot distribution module determines each time slot in the 10ms period as an uplink transmission time slot or a downlink transmission time slot according to the received time slot distribution scheme, and divides the uplink and downlink transmission time slots in the 10ms period to inform the transceiver module;
and the transceiver module is used for carrying out uplink or downlink transmission in the corresponding time slot when carrying out communication according to the divided uplink and downlink transmission time slots.
16. The apparatus of claim 15, further comprising an allocation indication generating module for determining a number of bits used for indicating the slot allocation scheme, and sending the determined number of indicated bits to the allocation scheme selecting module;
correspondingly, the allocation scheme selection module further determines all current selectable time slot allocation schemes according to the determined time slot allocation mode and the received indication bit number, and then selects the current used time slot allocation scheme from the current selectable time slot allocation schemes and sends the selected time slot allocation scheme to the time slot allocation module.
17. The apparatus of claim 16, wherein the number of bits is any one of 3 to 6 bits.
18. The apparatus according to claim 15, 16 or 17, wherein the timeslot allocation pattern is: two pairs of switching points exist in the 10ms period, or one pair of switching points exist in the 10ms period, or no switching point exists in the 10ms period.
19. The apparatus of claim 15, 16 or 17, further comprising a DwPTS indicating module for indicating that the DwPTS is transmitted once or twice within the 10ms period.
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| CN200710122552XA CN101400128B (en) | 2007-09-26 | 2007-09-26 | Method and device for wireless timeslot allocation in time division duplexing mobile communication system |
| PCT/CN2008/001644 WO2009046625A1 (en) | 2007-09-26 | 2008-09-24 | A method and device for allocating time slots of radio frame in time division duplexing mobile communication system |
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| CN200710122552XA CN101400128B (en) | 2007-09-26 | 2007-09-26 | Method and device for wireless timeslot allocation in time division duplexing mobile communication system |
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| WO2012072009A1 (en) * | 2010-11-30 | 2012-06-07 | 大唐移动通信设备有限公司 | Method, system, and device for time-division duplex communication |
| WO2013181846A1 (en) * | 2012-06-08 | 2013-12-12 | 海能达通信股份有限公司 | Data transmission method and device in private network communications |
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| KR20020052561A (en) * | 2000-12-26 | 2002-07-04 | 구자홍 | Method for Measuring Position in Time Division Duplex mode |
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| EP1511190A1 (en) * | 2003-08-27 | 2005-03-02 | Siemens Aktiengesellschaft | Method for transmission in a TDD system with variable length guard period |
| CN1780457A (en) * | 2004-11-24 | 2006-05-31 | 北京三星通信技术研究有限公司 | Wireless channel resource allocation |
| CN101005305A (en) * | 2006-01-17 | 2007-07-25 | 上海原动力通信科技有限公司 | Transmitting method for time division duplex mobile communication system |
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| WO2009046625A1 (en) | 2009-04-16 |
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