WO2009049480A1

WO2009049480A1 - A method, system and device for transmitting wireless frame in time division duplexing mobile communication system

Info

Publication number: WO2009049480A1
Application number: PCT/CN2008/001647
Authority: WO
Inventors: Xueming Pan; Shiqiang Suo; Hai Tang; Ke Wang
Original assignee: Datang Mobile Communications Equipment Co., Ltd
Priority date: 2007-09-27
Filing date: 2008-09-24
Publication date: 2009-04-23
Also published as: CN101399606A; CN101399606B

Abstract

A method for transmitting wireless frame in time division duplexing mobile communication system is disclosed. A wireless frame duration transmitted in the time division duplexing mobile communication system includes a pair of uplink/downlink slot switch points. A wireless frame duration includes two half-frames, in which the first half-frame includes the first uplink/downlink slot switch point of the pair of uplink/downlink slot switch points. The second uplink/downlink slot switch point can be set in any guard period behind the first uplink/downlink slot switch point. The exact location is determined by the configuration of uplink/downlink slots in the cell. It can save the cost of guard period GP switching efficiently under the situation of large and super large base station coverage, improve the wireless frame transmission efficiency by the method for transmitting wireless frame in time division duplexing mobile communication system.

Description

Method, system and device for wireless frame transmission of time division duplex mobile communication system

The present invention relates to the field of data transmission, and in particular, to a method, system and device for wireless frame transmission of a time division duplex mobile communication system. Background technique

In the Long Term Evolution (LTE) technology, the Low Chip Rate-Time Division Duplexing (LCR-TDD) frame structure is written as a standard for the LTE TDD Type 2 frame structure, as shown in Figure 1. In the LTE TDD Type 2 frame structure, each 10ms regular time slot (TimeSlot) and three special time slots, each regular time slot TSI (an integer of IG {0, 1, , 6 }) is orthogonal Orthogonal Frequency Division Multiplexing (OFDM) symbol composition, the use of special time slots is the same as the original LCR TDD mode: Downlink Pilot Time Slot (DwPTS) is used as the downlink synchronization signal transmission. Guard Period 1 (GP1) is used for the protection interval when the downlink transmission is switched to the uplink transmission, and the Uplink Pilot Time Slot (UpPTS) is used as the uplink random access. In the regular time slot, the regular time slot TS0 is used for downlink data transmission and the TS1 is used for uplink data transmission.

There are two pairs of uplink and downlink time slot switching points in each 10ms radio frame. As shown in FIG. 1, the downlink to uplink time slot switching point DUSP and uplink to downlink time slots are included in the first 5ms field. The switching point UDSP (for the uplink and downlink time slots separated by a transition point, which is defined here as DUSP and UDSP is also true), the same pair of uplink and downlink time slot switching points exist in the second 5ms half frame. Two pairs of uplink and downlink time slot switching points correspond to two sets of special time slots, including two downlink to uplink switching guard intervals GP1.

Since the guard interval GP1 determines the coverage of the base station, in the frame structure shown in Figure 1, the guard interval GP1 has a duration of 50 μs and can only support a coverage of 7.5 km (the speed of light x 50 μ s/2 = 7.5 km). . In practical applications, if it is necessary to increase the coverage of the base station, it is necessary to increase the duration of the GP1. As shown 2, in the prior art, in order to support the large coverage of the base station, the original GP1 and UpPTS, TS1 three time slots can be combined as a new GP1 (random access is completed in TS2 and subsequent consecutive uplink time slots) ), with a duration of 866.66 μ _δ , can support a coverage of about 130 km, and the GP1 overhead in the radio frame is 17.33 % (866.66 μ s/5ms).

Further, in order to support an excessive coverage of 200 km or more, as shown in FIG. 3, the original GP1 and UpPTS, TS1, and TS2 time slots can be combined as a new GP1 (random access in consecutive uplink time slots in and after TS3) Completion), with a duration of 1541.66 μ _δ , can support a coverage of about 230 km, and the GP1 overhead in the radio frame is 30.83 % (1541.66 μ s/5ms).

As described above, the existing LTE TDD Type 2 frame structure has an uplink and downlink time slot allocation with a period of 5 ms half frame, that is, a pair of uplink and downlink time slot switching points are set in each 5 ms field, corresponding to one downlink to uplink. Protection interval GP1. According to the principle of Time Division Duplexing (TDD), the duration of the guard interval GP1 is proportional to the coverage of the base station. When the existing frame structure supports large coverage or large coverage, since a longer GP1 needs to be set in each 5ms field, the GP1 overhead is large, which reduces the efficiency of data transmission. Summary of the invention

Embodiments of the present invention provide a method, system, and apparatus for wireless frame transmission of a time division duplex mobile communication system, which can save the overhead of guard interval GP and improve the efficiency of data transmission.

A method for transmitting a radio frame of a time division duplex mobile communication system according to an embodiment of the present invention, the method includes:

A radio frame period transmitted in a time division duplex mobile communication system includes a pair of uplink and downlink slot switching points.

The embodiment of the invention discloses a time division duplex mobile communication system, which comprises:

a base station, configured to send downlink data or control signaling to the user equipment by using a radio frame, and receive uplink data or control signaling sent by the user terminal by using the radio frame;

a user terminal, configured to send uplink data or control signaling to the base station by using a radio frame, and receive downlink data or control signaling sent by the base station by using the radio frame; The radio frame includes a pair of uplink and downlink slot switching points in one cycle. A base station provided by an embodiment of the present invention includes a sending unit and a receiving unit, where

The sending unit is configured to send downlink data or control signaling to the user terminal by using a radio frame, where the receiving unit is configured to receive uplink data or a control signaling sent by the user terminal by using a radio frame;

The radio frame includes a pair of uplink and downlink slot switching points in one cycle.

A user terminal according to an embodiment of the present invention includes a sending unit and a receiving unit, where the sending unit is configured to send uplink data or control signaling to a base station by using a radio frame, where the receiving unit is configured to receive a base station by using a radio frame. Transmitted downlink data or control signaling; wherein the radio frame includes a pair of uplink and downlink slot switching points in one cycle.

A configuration apparatus provided by an embodiment of the present invention includes a computing unit and a communication unit, where the calculating unit is configured to calculate a duration of the GP according to a coverage of the base station, and select a frame structure configuration corresponding to a duration of the GP;

The communication unit is configured to notify the base station and the user terminal of the frame structure configuration.

In the embodiment of the present invention, a pair of uplink and downlink time slot switching points are set in a radio frame period. In a large coverage and a large coverage scenario of the base station, the downlink data and the uplink data need only be switched once in a radio frame period, which is effective. It saves the overhead of switching protection interval GP and improves the efficiency of wireless frame transmission. DRAWINGS

1 is a schematic structural diagram of a prior art LTE TDD Type 2 frame;

2 is a schematic diagram of a guard interval GP1 setting in the prior art supporting a coverage of 130 km; FIG. 3 is a schematic diagram of a guard interval GP1 setting in a prior art supporting 230 km coverage; FIG. 4 is a pair of uplink and downlink in a 10 ms radio frame according to an embodiment of the present invention; Schematic diagram of the frame structure of the slot switching point;

5 is a schematic diagram of setting a guard interval GP of a coverage interval of 130 km in a 10 ms slot allocation period according to an embodiment of the present invention; 6 is a schematic diagram of setting a guard interval GP of a coverage interval of 230 km in a 10 ms slot allocation period according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a wireless frame transmission system according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another wireless frame transmission system according to an embodiment of the present invention. detailed description

In the embodiment of the present invention, the uplink and downlink time slots are allocated by using one radio frame as a cycle. By setting a pair of uplink and downlink time slot switching points in one radio frame period, the guard interval can be effectively saved when the coverage of the base station is increased. The overhead of improving the efficiency of wireless frame transmission.

In the LTE TDD Type 2 frame structure, the fixed duration of a radio frame is 10 ms, including two half frames with a duration of 5 ms. By setting only one pair of uplink and downlink time slot switching points in the entire 10 ms radio frame, corresponding to one downlink to uplink. The guard interval GP of the handover can effectively save the overhead of the guard interval GP and increase the efficiency of the radio frame transmission when the coverage of the base station increases and the GP duration needs to be increased.

In the LTE TDD Type 2 frame structure, only one pair of uplink and downlink time slot switching points are set in the entire 10 ms radio frame, including setting a downlink to uplink time slot switching point in the first 5 ms field, corresponding to one downlink to uplink. The guard interval GP of the handover, the location of the second slot switch point is set according to the configuration of the uplink and downlink time slots of the cell, and in the second 5 ms field, three special time slots (downlink pilot time slot DwPTS, The guard interval GP and the uplink pilot time slot UpPTS are combined into one short time slot for transmission of uplink/downlink data or control signaling.

In the manner provided by the embodiment of the present invention, the overhead of the GP is 50% of the GP overhead in the prior art frame structure. As described in the following description, the embodiments provided by the present invention mainly reflect that only one pair of upper and lower slot switching points are set in a period of 10 ms radio frames, and the transmission efficiency of radio frame data is improved in a large coverage scenario.

Specific embodiments of the present invention are described below in conjunction with the drawings.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of a frame for setting a pair of uplink and downlink time slot switching points in a 10 ms radio frame according to an embodiment of the present invention. Wherein, in the embodiment of the present invention, the 10ms wireless frame is drawn It is divided into two 5ms half frames, including the first 5ms field (field 1) and the second 5ms field (field 2). There is only one pair of uplink and downlink time slot switching points in the 10ms radio frame, including the downlink to uplink time slot switching point DUSP and the uplink to downlink time slot switching point UDSP, corresponding to a downlink to uplink switching guard interval GP, and in the second Within 5ms half frames, three special time slots are combined into one short time slot TS for transmitting data or control signaling.

As shown in Figure 4, the guard interval GP is 50 μ _δ and can only support 7.5 km coverage. In practical applications, in order to support the large coverage of the base station, it is necessary to increase the duration of the guard interval GP and increase the duration of the GP. The GP, UpPTS, and the conventional time slot can be combined as a new guard interval GP.

The following is a method for setting a guard interval GP with a 10 ms time slot allocation period in a large coverage scenario of a base station. The base station large coverage scenario refers to a range in which the base station covers a range of about 130 km. This embodiment is described by a base station covering 130 km range, as shown in FIG. 5 . Show:

When the uplink and downlink time slots are allocated in a period of 10 ms radio frame, the 10 ms radio frame includes: a first 5 ms field and a second 5 ms field. The first 5ms field consists of seven regular time slots TSI, IG {0,1, ..., 6 } integers, and three special time slots: Downlink pilot time slot DwPTS, guard interval

The GP, the uplink pilot time slot UpPTS, combines the GP of the first 5ms field with the three timeslots of UpPTS and TS1 as a new GP with a duration of 866.66 s; the second 5 ms half frame, including seven regular times The slot TSI, the integer of IG {0,1, ..., 6 }, and three special time slots: downlink pilot time slot DwPTS, guard interval GP, uplink pilot time slot UpPTS, three special The time slots DwPTS, GP and UpPTS are combined as one short time slot TS, which can transmit data or control signaling.

The process of switching the uplink and downlink time slots within a 10 ms radio frame is further described below.

In the first 5ms field, TS0 is used as the downlink time slot to transmit downlink data. The new GP duration is 866.66 μs, which supports 130km coverage. DUSP is the downlink to uplink time slot switching point. To receive handover, random access is completed in TS2 and subsequent consecutive uplink time slots, TS2 ~ TS6 are used as uplink time slots to transmit uplink data; in the second 5ms field, TS0 and short time slot TS are used as The uplink time slot, through the uplink to downlink time slot switching point UDSP, completes the handover of the base station receiving and transmitting, TSI ~ TS6 is used as the downlink time slot, and then, the next 10 ms wireless frame number is performed. According to the transmission.

Since the switching of the uplink to the downlink time slot does not need to consume the GP, the location of the UDSP is not limited by this embodiment, as long as all the positions of the uplink to downlink time slot switching points satisfying the spirit of the present invention are included in the scope of the present invention. Inside.

The following is a description of the method for setting the guard interval GP with a 10 ms time slot allocation period in a super-large coverage scenario of the base station. The super-large coverage scenario of the base station covers a range of about 230 km for the base station. This embodiment uses a base station coverage of 230 km, as shown in FIG. 6 . Shown as follows:

The GP, the uplink pilot time slot UpPTS, combines the GP of the first 5ms field with the four timeslots of UpPTS, TS1, and TS2 as a new GP with a duration of 1541.66 S; the second 5 ms half frame, including seven Regular time slot TSI, IG {0, 1, ..., 6 } integer, and three special time slots: Downlink pilot time slot

DwPTS, guard interval GP, uplink pilot time slot UpPTS, combines three special time slots DwPTS, GP and UpPTS as one short time slot TS, which can transmit data or control signaling.

In the first 5ms field, TS0 is used as the downlink time slot, the new GP duration is 1541.66 s, which supports 230km coverage, and DUSP is the downlink to uplink time slot switching point, completing the base station's transmission to reception switching. Random access is completed in TS3 and subsequent consecutive uplink time slots, TS3 ~ TS6 are used as uplink time slots; in the second 5ms field, TS0 and short time slot TS are used as uplink time slots, when going up to downlink The slot switching point UDSP completes the handover of the base station's receive to transmission, TSI ~ TS6 is used as the downlink time slot, and then the next 10 ms radio frame data is transmitted.

As shown in FIG. 7, a time division duplex mobile communication system provided by an embodiment of the present invention includes a base station, a configuration device, and a user terminal. The base station is configured to send downlink data or control signaling to the user equipment by using a radio frame, send base station coverage signaling to the configuration device, and receive uplink data or control signaling sent by the user terminal through the radio frame, and receive the configuration device. Transmit frame structure configuration signaling;

The configuration device is configured to calculate a duration of the GP in the coverage according to the coverage of the base station, select a corresponding frame structure configuration according to the duration of the GP, and notify the base station and the user terminal of the frame structure configuration through the broadcast channel, so that the base station and the user terminal are configured according to the base station and the user terminal. The frame structure configuration performs data transmission and reception;

The user terminal is configured to send uplink data or control signaling to the base station by using a radio frame, receive downlink data or control signaling sent by the base station by using the radio frame, and receive frame structure configuration signaling of the configuration apparatus.

The radio frame includes a pair of uplink and downlink time slot switching points in one cycle, and the downlink to uplink time slot switching GP duration is configurable.

The base station of the embodiment of the present invention includes a transmitting unit and a receiving unit. The sending unit is configured to send downlink data or control signaling to the user terminal by using a radio frame, where the receiving unit is configured to receive uplink data or control signaling sent by the user terminal by using a radio frame, and receive a frame structure sent by the configuration apparatus. The signaling is configured, the radio frame includes a pair of uplink and downlink time slot switching points in one cycle, and the downlink to uplink time slot switching GP duration is configurable.

The configuration device of the embodiment of the invention comprises a computing unit and a communication unit. The calculation unit is configured to calculate a frame structure corresponding to the duration of the GP according to the coverage of the base station, and the communication unit is configured to notify the base station and the user terminal of the frame structure configuration.

The user terminal of the embodiment of the present invention includes a sending unit and a receiving unit. The sending unit is configured to send uplink data or control signaling to the base station by using a radio frame, where the receiving unit is configured to receive downlink data or control signaling sent by the base station by using a radio frame, and receive a frame structure configuration signal sent by the configuration apparatus. Therefore, the radio frame includes a pair of uplink and downlink time slot switching points in one cycle, and the downlink to uplink time slot switching GP duration is configurable.

As shown in FIG. 8, a time division duplex mobile communication system provided by an embodiment of the present invention includes a base station and a user terminal.

The base station is configured to send downlink data or control signaling to the user equipment by using a radio frame, and receive uplink data or control signaling sent by the user terminal by using the radio frame; a user terminal, configured to send uplink data or control signaling to the base station by using a radio frame, and receive downlink data or control signaling sent by the base station by using the radio frame;

The base station of the embodiment of the present invention includes a transmitting unit and a receiving unit. The sending unit is configured to send downlink data or control signaling to the user terminal by using a radio frame, where the receiving unit is configured to receive uplink data or control signaling sent by the user terminal by using a radio frame, where the radio frame is in one cycle. It includes a pair of uplink and downlink time slot switching points.

The user terminal of the embodiment of the present invention includes a sending unit and a receiving unit. The sending unit is configured to send uplink data or control signaling to the base station by using a radio frame, where the receiving unit is configured to receive downlink data or control signaling sent by the base station by using a radio frame, where the radio frame is included in one cycle. A pair of uplink and downlink time slot switching points.

As shown in Table 1 below, it is seen that the GP overhead comparison between the 5ms half-frame as the time slot allocation period and the 10ms radio frame as the time slot allocation period under different coverage ranges shows that as the coverage increases, 10ms is used. The radio frame is a slot allocation period, which can effectively save GP overhead, thereby improving the radio frame transmission efficiency.

Table 1 GP overhead comparison of 5ms and 10ms slot allocation periods under different coverage areas

In summary, the beneficial effects of the embodiments of the present invention are that, in the scenario of large coverage and large coverage of the base station, since the downlink time slot and the uplink time slot need only be switched once in one radio frame period, the effective saving is achieved. Switching the overhead of the guard interval GP improves the efficiency of wireless frame transmission. The present invention will be described in detail with reference to the preferred embodiments, and those skilled in the art should understand that the technical solutions in the embodiments of the present invention may be modified or substituted without departing from the technical solutions of the embodiments of the present invention. Spirit and scope.

Claims

Rights request

A method for radio frame transmission in a time division duplex mobile communication system, characterized in that a radio frame period transmitted in a time division duplex mobile communication system comprises a pair of uplink and downlink slot switching points.

2. The method according to claim 1, wherein the one radio frame period comprises two fields, wherein, in the first field, the pair of uplink and downlink time slot switching points are included The first uplink and downlink time slot switching point.

The method according to claim 2, wherein the position of the second uplink and downlink time slot switching point of the pair of uplink and downlink time slot switching points is after the first uplink and downlink time slot switching point position The location of any guard interval.

The method according to claim 3, wherein the special time slot of the second field in the radio frame period is used for transmitting uplink and downlink data or control signaling, and the transmitted data is uplink data or The downlink data depends on the location of the second uplink and downlink time slot switching point.

The method according to claim 1, wherein in the large coverage scenario of the base station, in a radio frame period to be transmitted, the guard interval GP of the first field and the uplink pilot time slot UpPTS are conventional. The three time slots of time slot TS1 are combined as a new GP.

The method according to claim 1, wherein in the super-large coverage scenario of the base station, in the one radio frame period to be transmitted, the GP of the first field and the UpPTS, TS1, and the regular time slot TS2 are four. The time slot is merged as a new GP.

7. A time division duplex mobile communication system, comprising:

a user terminal, configured to send uplink data or control signaling to the base station by using a radio frame, and receive downlink data or control signaling sent by the base station by using the radio frame;

8. The system of claim 7, further comprising:

a configuration device, configured to calculate a duration of the GP under the coverage according to a coverage of the base station, The radio frame structure corresponding to the duration of the GP is selected, and the base station is notified to perform data transmission and reception according to the frame structure configuration, and the frame structure configuration is notified to the user terminal by the broadcast channel to perform data transmission and reception according to the frame structure configuration.

A base station, comprising: a sending unit and a receiving unit,

The base station according to claim 9, wherein the receiving unit is further configured to receive frame structure configuration signaling sent by the configuration device;

Among them, the downlink to uplink time slot switching GP duration can be configured.

A user terminal, comprising: a transmitting unit and a receiving unit,

The sending unit is configured to send uplink data or control signaling to the base station by using a radio frame, where the receiving unit is configured to receive downlink data or control signaling that is sent by the base station by using a radio frame, where the radio frame is in one cycle. It includes a pair of uplink and downlink time slot switching points.

The user terminal according to claim 11, wherein the receiving unit is further configured to receive frame structure configuration signaling sent by the configuration device;

13. A configuration device, comprising: a computing unit and a communication unit,

The calculating unit is configured to calculate a duration of the GP according to the coverage of the base station, and select a frame structure configuration corresponding to the duration of the GP;