WO2012155680A1

WO2012155680A1 - Method and device for configuring guard interval in communication system

Info

Publication number: WO2012155680A1
Application number: PCT/CN2012/072917
Authority: WO
Inventors: 刘锟; 鲁照华; 宁迪浩; 郁光辉; 胡留军
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-08-24
Filing date: 2012-03-23
Publication date: 2012-11-22
Also published as: CN102281229A; CN102281229B

Abstract

Disclosed are a method and device for configuring an uplink/downlink guard interval in a communication system. In the present invention, in a communication system where an OFDM technology is used, the sampling frequency is F hertz, and the time domain sampling interval is Ts seconds, the length of a downlink-to-uplink guard interval (DUGI) of a frame is set to N1*(N2*Ts)+T1, and the length of an uplink-to-downlink guard interval (UDGI) of a frame is set to M1*(M2*Ts)+T2. N1, N2, T1, M1, M2, and T2 are all positive integers greater than or equal to zero, which are configured by a base station to a terminal through a downlink channel, or are default configured values. The present invention can flexibly satisfy requirements of a base station and a terminal on conversion of delays and can make full use of time and frequency resources, thereby not wasting the resources.

Description

Configuration method and device for switching interval in communication system

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for configuring a transition interval in a communication system using OFDM (Orthogonal Frequency Division Multiplexing) technology. Background technique

With the development of mobile Internet and the popularity of smart phones, the demand for mobile data traffic is growing rapidly, and the rapid growth of data services poses a serious challenge to the transmission capabilities of mobile communication networks. According to authoritative forecasts, in the next decade (2011-2020), mobile data traffic will double every year and will increase by a thousand times in ten years.

Most mobile data services occur mainly in indoor and hotspot environments, as reflected in nomadic/local wireless access scenarios. According to statistics, nearly 70% of mobile data traffic is currently indoors, and this proportion will continue to grow, and is expected to exceed 80% by 2012. The data service is mainly for Internet services, and the requirements for service quality are relatively simple, and far lower than the requirements for service quality of traditional telecommunication services. The cellular mobile communication system is mainly designed for high-speed mobile, seamless telecommunication traditional telecommunication service design. When it carries large-flow and low-speed IP (Internet Protocol) packet services, the efficiency is low and the cost is too high.

The existing solutions for nomadic/local wireless data access mainly include the IEEE ( Institute of Electrical and Electronics Engineers) 802.11 series of standards, and the domestic new shoreline company-led NUHT (Next Ultra-High). Throughout) standard. The NUHT standard uses OFDM technology and configures the frame structure of TDD. The downlink-to-uplink transition interval (DGI) and the uplink-to-downlink transition interval (UGI) are described by an integer multiple of the OFDM symbol length. Considering the base station (access point, AP, Access Point) The terminal and the terminal have different requirements for the conversion delay. Generally, the DGI time length is required to be larger than the UGI. Since the types of terminals in indoor and hotspot environments vary widely, the conversion delay requirements are also different. If the OFDM symbol length is used as the minimum time unit for describing DGI and UGI, some resources will be wasted due to excessive quantization granularity. As shown in Figure 1, consider that the reasonable DGI value of the terminal after the conversion delay requirement is T1. However, since the DGI is configured as an integer multiple of the OFDM symbol length, only two OFDM symbols can be allocated for the DGI, resulting in resources. waste. And when a fixed-length frame structure is used, since the length of the frame is not necessarily an integer multiple of the length of the OFDM symbol, a time-frequency resource smaller than the length of the OFDM symbol is generated, and this part should be considered in the design of DGI and UGI. Use of resources.

Summary of the invention

In view of the above, the main purpose of the present invention is to provide a method and a device for configuring an uplink and downlink transition interval in a communication system, which is used to solve the problem that the existing DGI and UGI configuration methods are easy to waste resources, and cannot satisfy the base station and the terminal in different scenarios. Technical issues for conversion latency requirements.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

Technical Solution 1: According to an aspect of the present invention, a method for designing an uplink and downlink conversion interval in a communication system is provided, the method comprising:

In a communication system using OFDM technology with a sampling frequency of F (Hertz, Hz), the time domain sampling interval is Ts (seconds, s), where Ts = l/F. The downlink-to-uplink transition interval DUGI has a length of N1*(N2*Ts)+T1, and the uplink-to-downlink transition interval UDGI has a length of M1*(M2*Ts)+T2, where the N1, N2, T1, Ml, Μ2, Τ2 are sent by the base station to the terminal through the downlink channel, or the default configuration value is adopted.

The sampling frequency F is the maximum sampling frequency of the system or is an integer multiple of the maximum sampling frequency of the system. Technical Solution 2: Based on the technical solution 1, the configuration of the T1 is T1=kl*Ts, and the T2 is configured as T2=k2*Ts, where k1 and k2 are positive integers greater than or equal to zero, and are sent by the base station to the downlink channel. Terminal, or use the default configuration values.

Technical Solution 3: Based on the technical solution 2, the (N2*Ts) is a minimum quantization granularity of the DUGI, and N1 is a multiple of a minimum quantization granularity of the DUGI; the (M2*Ts) is a minimum quantization granularity of the UDGI, Ml a multiple of the minimum quantization granularity of the UDGI; wherein Nl, N2, Ml, M2 are positive integers greater than or equal to zero.

Solution 4: Based on the technical solution 3, the minimum quantization granularity of the DUGI and the minimum quantization granularity of the UDGI are both configured as an OFDM symbol length T _OTDM , that is, the (N2*Ts) and the (M2*Ts) Both are configured as T _OFDM , whereby the DUGI length is Nl*T _OFDM +Tl and the UDGI length is M1*T _OTDM +T2.

Preferably, based on the technical solution 1, the DUGI length is greater than or equal to the UDGI length; preferably, based on the technical solution 4, the values of T1=kl*Ts and T2=k2*Ts are all smaller than the length T of the OFDM symbol. _FDM ;

Technical Solution 5: Based on Technical Plan 4, when the frame length is! ^^ and only one DUGI and one UDGI are configured within one frame, and r _Remai „ indicates the length of the remaining resources in the time domain except for an integer multiple of the OFDM symbol within one frame:

T

τ Frame

Remain =τ Frame ¹ OFDM ~ L ^{1 S}

Τ ¹ OFDM

Where L" represents the rounding down operation and L is a positive integer greater than zero;

When the length of T1 is configured as r _Remai „, then kl=L, and at the same time, T2=0, ie k2=0;

When the length of T2 is configured as r _Remai „, then k2=L, and at the same time, T1=0, that is, kl=0;

When the length of T1+T2 is configured as r _R . , then kl+k2=L. Technical Solution 6: 4 aspect based on, when the configuration number N _DUGI Dugi and UDGI 1 ^^ _N U∞I number and the frame length is within an order represents a frame T _{R iri} addition to an integral multiple of the OFDM symbols The length of the remaining resources in the time domain:

T

τ Frame

Remain = τ Frame τ ¹ OFDM ~ L ^{1 S}

¹ OFDM

Where L" represents a downward rounding operation, L is a positive integer greater than zero, N _DUGI and N _UDG are positive integers greater than or equal to 1; when the length of T1 is configured as D 'N, then kl = L / N _DTirTT , meanwhile, T2=0, ie k2=0;

DUGI When the length of T2 is configured as TM'·"/, then k2=L/N _UDGI , and at the same time, T1=0, that is, kl=0; when the length of N _DUGI *T1+ NUDGI *T2 is configured as r _R . „, then NDUGI *kl+ N _UDGI *k2=L.

The present invention further provides a configuration apparatus for uplink and downlink transition intervals in a communication system, which is applied to a communication system using OFDM technology and a time domain sampling interval of Ts seconds. The device includes:

The DUGI configuration module is configured to set the downlink to uplink transition interval DUGI length in the frame to Nl*(N2*Ts) + T1, where Tl=kl*Ts;

The UDGI configuration module is configured to set the uplink to downlink transition interval UDGI length in the frame to Ml* ( M2*Ts ) + T2, where T2=k2*Ts;

The parameter configuration module is configured to configure the values of the parameters N1, N2, kl, Ml, M2, and k2, and configure the foregoing parameters to the terminal through the downlink channel, or configure the default values of the foregoing parameters for the network side or the terminal side.

The present invention sets the downlink-to-uplink transition interval DUGI length in the frame to N1*(N2*Ts)+T1, and sets the uplink-to-downlink transition interval UDGI length in the frame to M1*(M2*Ts)+T2; The network side can flexibly configure the base station and the terminal according to the requirements of the conversion delay in different scenarios. Parameters such as Nl, N2, Tl, Ml, M2, and T2 can use time-frequency resources to the maximum extent without causing waste of resources. DRAWINGS

1 is a schematic diagram of position distribution of DGI and UGI in a frame in a communication system; FIG. 2 is a schematic diagram of a DUGI and UDGI position distribution in the method of the present invention; FIG. 3 is another DUGI and UDGI position in the method of the present invention; Schematic diagram of the distribution. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

In a communication system using OFDM technology with a sampling frequency of F (Hertz, Hz), the time domain sampling interval is Ts (seconds, s), where Ts = l/F.

Configure the length of the Downlink to Uplink Gap Interval (DUGI) to Nl* ( N2*Ts ) +Tl and the length of the Uplink to Downlink Gap Interval (UDGI) to Ml*. (M2*Ts) +T2, as shown in Figure 2.

among them,

The N1, N2, Tl, Ml, M2, and T2 are positive integers greater than or equal to zero;

(N2*Ts) is the minimum quantization granularity of DUGI, the value of T1 is an integer multiple of Ts, Tl=kl*Ts, and N1 is a multiple of the minimum quantization granularity of the DUGI;

(M2*Ts) is the minimum quantization granularity of UDGI, and the value of T2 is an integer multiple of Ts.

T2=k2*Ts, Ml is a multiple of the minimum quantization granularity of the UDGI;

The N1, N2, T1, M1, Μ2, Τ2, kl, k2 are sent by the base station to the terminal through the downlink channel, or adopt a default configuration set by the protocol; Example 2

When the OFDM symbol length T _{OFDM is selected} as the minimum quantization granularity of the downlink-to-uplink transition interval DUGI and the uplink-to-downlink transition interval UDGI, the DUGI length is N1*T _OTDM +T1 , and the UDGI length is M1*T _OTDM +T2;

Wherein, the values of Tl=kl*Ts and T2=k2*Ts are both smaller than the length of the OFDM symbol T _OFDM ;

Nl, Ml, kl, k2 are sent by the base station to the terminal through the downlink channel, or adopt a default configuration set by the protocol;

(1) When the frame length is a fixed value! ^^ And when there is only one DUGI and one UDGI within one frame, ^ is the length of the remaining resources other than the integer multiple of the OFDM symbol in one frame in the time domain:

T

τ Frame

Remain =τ Frame ¹ OFDM ~ L ^IS

Τ ¹ OFDM

Where L" means rounding down.

When the length of the T1 is equal to r _R . , then kl=L, and at the same time, T2=0, that is, k2=0;

When the length of the T2 is equal to r _R . „, then k2=L, and at the same time, T1=0, that is, kl=0;

When the length of the T1+T2 is equal to r _R . , then kl+k2=L;

(2) When the frame length is a fixed value T _Frame and there are N _DUGI (N _DUGI is a positive integer greater than 1) DUGI and N _UDGI (NUDGI is a positive integer greater than 1) UDGI within 1 frame,

T

τ Frame

Remain two τ Frame τ * L*7 ^ denotes OFDM of OFDM symbols except one integer multiple of 1 frame

The length of the remaining resources in the time domain.

When the length of the T1 is equal to TM, then kl=L/N _DUCI , and at the same time, T2=0, ie K2=0; N Li, meanwhile, T1=0, ie

Kl=0;

When the length of the N _DUGI *T1+ NUDGI *Τ2 is equal, then NDUGI *kl+

Example 3

In the communication system with OFDM technology, the bandwidth is 20MHz, the frame length is r _F =5ms, and the sampling frequency is 30.72MHz, the subcarrier spacing is 120KHz, and the time domain sampling interval is Ts=l/30.72MHz=32.55ns.

The communication system generates a time domain OFDM symbol and transmits it using an inverse fast Fourier transform IFFT operation of 30.72 * 1000 / 120 = 256 points.

The cyclic prefix CP of an OFDM symbol contains 24 sample points with a length of approximately 0.781 us and a length r of the entire OFDM symbol. _{The FDM} is approximately 9.115us. Calculate the length r _R of the resource included in the time domain in addition to the OFDM symbol containing an integer multiple in one frame according to the following formula.

T

τ Frame * 7"

Re main = τ Frame ¹ OFDM

T ^A OFDM

5000

= 5000 *9.115^

9.115

= 4.98^ - 153*7^

When r. _{When FDM} is the minimum quantization granularity of DUGI and UDGI, the DUGI length is Nl*T _OF DM+Tl, and the UDGI length is Ml*T _OFDM +T2, where Nl and Ml are positive integers greater than or equal to zero;

When there is only one DUGI and one UDGI in one frame, Tl=r _Remai „ , T2=0; preferably, Nl=2, Ml=2, ie DUGI=23.21us, UDGI=18.23us; Preferably, Nl=3, Ml=2, ie DUGI=32.325us, UDGI=18.23us;

When there are only K (Κ is a positive integer greater than 1) DUGI and UD UDGI in 1 frame, K*Tl=r _Re T2=0, where N1 and Ml are positive integers greater than or equal to zero, then the length of DUGI is Nl *T _OFDM+ r _R „/k, UDGI length is Ml*T _OFDM+ T2/r _R „;

Preferably, Nl=2, Ml=2;

Preferably, Nl=3, Ml=2; Example 4

In OFDM technology, the bandwidth is 20MHz, the frame length is r _F =5ms, and the sampling frequency is 30.72MHz. The subcarrier spacing is 120ΚΗζ, and the time domain sampling interval is Ts=l/30.72MHz=32.55ns.

The communication system generates a time domain OFDM symbol and transmits using an IFFT operation of 30.72*1000/120 = 256 points.

The CP of an OFDM symbol contains 24 sample points with a length of approximately 0.781 us and a length r of the entire OFDM symbol. _FDM is about 9.15us

Calculate the length r _R of the resource included in the time domain in addition to the OFDM symbol containing an integer multiple in one frame according to the following formula.

5000us

= 5000us- *9.ll5us

9.115

= 4.98^-153*7^

When r. _{When FDM} is the minimum quantization granularity of DUGI and UDGI, the DUGI length is N1*TOFDM+T1, and the UDGI length is Ml*T _OFDM +T2, where Nl and Ml are positive integers greater than or equal to zero;

When there is only one DUGI and one UDGI in one frame, Τ1=0, Ί2=Τ _τ Preferably, Nl=3, Ml=2, ie DUGI=27.345us, UDGI=23.21us;

Preferably, Nl=2, Ml=l, that is, DUGI=18.23us, UDGI=14.095us;

Preferably, Nl=3, Ml=l, ie DUGI=27.345us, UDGI=14.095us;

When there are only K (K is a positive integer greater than 1) DUGI and one UDGI in one frame, K*Tl=r _Remai „, T2=0, where N1 and Ml are positive integers greater than or equal to zero, then DUGI length Nl*T _OFDM +r _Re „, „/k, UDGI length is Ml*T _OFDM +T2/r _Re ; preferably, Nl=2, Ml=2;

Preferably, Nl=3, Ml=2;

Example 5

In OFDM technology, the bandwidth is 20MHz, the frame length is 7 = 5ms, and the sampling frequency is 30.72MHz. The subcarrier spacing is 120KHz, and the time domain sampling interval is Ts=l/30.72MHz=32.55ns.

The CP of an OFDM symbol contains 24 sample points with a length of approximately 0.781 us and a length r of the entire OFDM symbol. _{The FDM} is approximately 9.115us. According to the following formula, in addition to the OFDM symbol containing integer multiples in one frame, the length of the resource included in the time domain is r _R „ _;

5000^

= 5000^ - *9.115^

9.115

= 4.98M 153*7^ When r. _{When FDM} is the minimum quantization granularity of DUGI and UDGI, the DUGI length is Nl*T _OF DM+Tl, and the UDGI length is Ml*T _OFDM +T2, where N1 and Ml are positive integers greater than or equal to zero;

When there is only one DUGI and one UDGI in one frame, Tl+T2=r _Remai „ , and the values of T1 and T2 are flexibly configured according to the processing capabilities of the terminal and the base station;

When there are only K (K is a positive integer greater than 1) DUGI and K UDGI in one frame, K*(Tl+T2)=r _Remai „ , and the T1 and T2 are flexibly configured according to the processing capabilities of the terminal and the base station. value.

Example 6

In the communication system with OFDM technology, the bandwidth is 20MHz, the frame length is r _F =10ms, and the sampling frequency is 30.72MHz, the subcarrier spacing is 120KHz, and the time domain sampling interval is Ts=l/30.72MHz=32.55ns.

The CP of an OFDM symbol contains 24 sample points with a length of approximately 0.781 us and a length r of the entire OFDM symbol. _{The FDM} is approximately 9.115us. Calculate the length r _R of the resource included in the time domain in addition to the OFDM symbol containing an integer multiple in one frame according to the following formula.

T

T Frame

Re main Τ Frame OFDM

T OFDM

When r. _{When FDM} is the minimum quantization granularity of DUGI and UDGI, the DUGI length is Nl*T _OF DM+Tl, and the UDGI length is Ml*T _OFDM +T2, where N1 and Ml are positive integers greater than or equal to zero;

When there is only one DUGI and one UDGI in one frame, Tl=r _Remai „ , T2=0;

Preferably, Nl=2, Ml=2, ie DUGI=19.075us, UDGI=18.23us;

Preferably, Nl=3, Ml=2, ie DUGI=28.19us, UDGI=18.23us;

Preferably, Nl=2, Ml=2;

Preferably, Nl=3, Ml=2; Example 7

In OFDM technology, the bandwidth is 20MHz, the frame length is r _F =10ms, and the sampling frequency is 30.72MHz. The subcarrier spacing is 120KHz, and the time domain sampling interval is Ts=l/30.72MHz=32.55ns.

Calculate the length r _RR of the resource included in the time domain in addition to the OFDM symbol containing an integer multiple in one frame according to the following formula _;

10000

= 10000 - *9.115

= 0.845 « 26 *

When r. _{When FDM} is the minimum quantization granularity of DUGI and UDGI, the DUGI length is

N1*TOFDM+T1, the length of the UDGI is Ml*T _OFDM +T2, where Nl and Ml are positive integers greater than or equal to zero;

When there is only one DUGI and one UDGI in one frame, T1=0, T2=r _Remai „; preferably, Nl=3, Ml=2, ie DUGI=27.345us, UDGI=19.075us;

Preferably, Nl=2, Ml=l, ie DUGI=18.23us, UDGI=9.96us;

Preferably, Nl=3, Ml=l, ie DUGI=27.345us, UDGI=9.96us;

When there are only K (Κ is a positive integer greater than 1) DUGI and UD UDGI in 1 frame, K*Tl=r _Re T2=0, where N1 and Ml are positive integers greater than or equal to zero, then the length of DUGI is Nl *T _OFDM +r _R „/k, UDGI length is Ml*T _OFDM +T2/r _Ri

Preferably, Nl=2, Ml=2;

Preferably, Nl=3, Ml=2;

Example 8

The CP of an OFDM symbol contains 24 sample points with a length of approximately 0.781 us and a length r of the entire OFDM symbol. _TOM is about 9.15us The length of the resource in the time domain is 7;

When there are only K (K is a positive integer greater than 1) DUGI and K UDGI in one frame, K*(Tl+T2)=r _Remai „ , and the T1 and T2 are flexibly configured according to the processing capabilities of the terminal and the base station. Value. Example 9

Based on the foregoing embodiments, the present invention further provides a configuration apparatus for uplink and downlink switching intervals in a communication system, which is applied to a communication system using OFDM technology and a time domain sampling interval of Ts seconds, and the apparatus includes:

The parameter configuration module is configured to configure values of N1, N2, kl, Ml, M2, and k2, and configure the foregoing parameters to the terminal through the downlink channel, or configure the default of the foregoing parameters for the network side or the terminal side. Value.

Further, the DUGI configuration module configures that (N2*Ts) is a minimum quantization granularity of the DUGI, and N1 is a multiple of a minimum quantization granularity of the DUGI; and the UDGI configuration module configures the (M2*Ts) as a UDGI The minimum quantization granularity, Ml is a multiple of the minimum quantization granularity of the UDGI.

Further, the DUGI configuration module configures a minimum quantization granularity of the DUGI as an OFDM symbol length T _OFDM , that is, the (N2*Ts ) is configured as T _OFDM ; and the UDGI configuration module sets a minimum quantization granularity of the UDGI Configured as OFDM symbol length T _OFDM , that is, the (M2*Ts ) is configured as T _OFDM .

Further, when only one DUGI and one UDGI are configured within a frame length, and ^ is used to represent the length of the remaining resources in the time domain except for an integer multiple of the OFDM symbol in one frame: τ Remain =τ Frame

Frame ¹ OFDM ~ L ^{1 S}

T ^A OFDM When the DUGI configuration module configures the length of T1 as T _Remain , then kl=L, k2=0; the UDGI configuration module configures the length of T2 as r _R . „, then k2=L, kl =0; when the length of the DUGI configuration module and the UDGI configuration module ^! T1 + T2 is configured as U, then kl + k2 = L.

Further, when the frame length is 1^, and N _DUGI _DUGIs and N _{UDGI UDGIs} are configured within one frame, the remaining resources other than the integer multiple of the OFDM symbols in one frame are represented in the time domain by T _Remai „ Length: τ me

Remai =τ Fra

n Frame ¹ OFDM ~ L ^{1 S}

T ^A OFDM Where L" represents a downward rounding operation, L is a positive integer greater than zero, and N _DUGI and N UDGI are positive integers greater than or equal to 1;

When the DUGI configuration module configures the length of T1 as time, then kl=L/N DUGI '

K2=0; when the UDGI configuration module configures the length of T2 to ^T ^ / _N , then k2=L/ N _U∞I ,

, UDGI

Kl=0;

When the DUGI configuration module and the UDGI configuration module configure the length of N _DUC}I *T1+ N _UDGI *T2 to T _Remmn , then N _DUGI *kl+ N _u∞I *k2=L.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Industrial applicability

The present invention can flexibly meet the requirements of the base station and the terminal for the conversion delay in different scenarios, and can use the time-frequency resources to the maximum extent without causing waste of resources.

Claims

Claim

A method for configuring an uplink-downlink transition interval in a communication system, the method comprising: in a communication system using orthogonal frequency division multiplexing (OFDM) technology and a time domain sampling interval of Ts seconds, downlink to uplink in a frame The transition interval DUGI length is set to Nl* ( N2 * Ts ) + T1 , and the uplink to downlink transition interval UDGI length in the frame is set to Ml * ( M2 * Ts ) + T2;

The N1 N2 T1 M1 Μ2 Τ2 is configured by the base station to the terminal through the downlink channel, or adopts a default configuration value.

2. The method according to claim 1, wherein the configuration of the T1 is T1=k1*Ts, and the T2 is configured as T2=k2*Ts, where k1 and k2 are positive integers greater than or equal to zero, and are passed by the base station. The downlink channel is sent to the terminal, or the default configuration value is adopted.

3. The method according to claim 2, wherein: (N2*Ts) is a minimum quantization granularity of DUGI, and N1 is a multiple of a minimum quantization granularity of the DUGI; the (M2*Ts) is a minimum of UDGI Quantifying the granularity, Ml is a multiple of the minimum quantization granularity of the UDGI;

Where N1 N2 Ml M2 is a positive integer greater than or equal to zero.

4. The method according to claim 3, wherein the minimum quantization granularity of the DUGI and the minimum quantization granularity of the UDGI are both configured as an OFDM symbol length T _OTDM , that is,

(N2*Ts) and the (M2*Ts) are both configured as T ₀

5. The method according to claim 4, wherein when the frame length is 1^^ and only one DUGI and one UDGI are configured within one frame, T _Remai „ represents an OFDM symbol except one integer multiple of one frame. The length of the remaining resources in the time domain: ¹ OFDM ~ L ^{1 S}

When the length of T1+T2 is configured as r _R . , then kl+k2=L.

6. The method according to claim 4, wherein when the frame length is ! ^^ and when N _DUGI DUGI and N _{UDGI UDGI} are configured within the frame, r _Remai „ indicates the length of the remaining resources in the time domain other than the integer multiple of the OFDM symbol within one frame:

T Re = T Frame

Main Frame ¹ OFDM ~ L ^{1 S}

T ^A OFDM

Where L" represents a downward rounding operation, L is a positive integer greater than zero, and N _DUGI N _UDGI are positive integers greater than or equal to 1;

When the length of T1 is configured as D, then kl=L/N _DUC}I , and at the same time, T2=0, that is, k2=0;

/ ^ DUGI When the length of T2 is configured as , then k2=L/ N _UDGI , and at the same time, T1=0, ie kl=0;

/丄, UDGI

When the length of N _DUGI *T1+ N _UDGI *T2 is configured as r _R . , then N _DUGI *kl+ N _UDGI *k2=L.

A device for configuring an uplink-downlink transition interval in a communication system, which is applied to a communication system using an OFDM technology and a time domain sampling interval of Ts seconds, the device comprising:

UDGI configuration module, used to set the uplink to downlink transition interval UDGI length in the frame Is Ml* ( M2*Ts ) + T2, where T2=k2*Ts;

8. The apparatus according to claim 7, wherein

The DUGI configuration module configures (N2*Ts) to be the minimum quantization granularity of the DUGI, and N1 is a multiple of the minimum quantization granularity of the DUGI;

The UDGI configuration module configures (M2*Ts) to be the minimum quantization granularity of the UDGI, and M1 is a multiple of the minimum quantization granularity of the UDGI.

9. The apparatus according to claim 8, wherein

The DUGI configuration module configures a minimum quantization granularity of the DUGI to an OFDM symbol length T _OFDM , that is, the (N2*Ts ) is configured as T _OFDM ;

The UDGI configuration module configures a minimum quantization granularity of the UDGI to an OFDM symbol length T _OFDM , that is, the (M2*Ts ) is configured as T _OFDM .

10. The apparatus according to claim 9, wherein when only one DUGI and one UDGI are configured within one frame and one frame is within a frame, the OFDM symbol except one integer in one frame is represented by T _Remai „ The length of the remaining resources outside the time domain: τ Frame

Remain = τ Frame τ -' OFDM ~ L "

¹ OFDM

Where L" represents a downward rounding operation, L is a positive integer greater than zero; when the DUGI configuration module configures the length of T1 as T _Re , then kl = L, k2 = 0; the UDGI configuration module will T2 The length is configured as r _{R ;} „, then k2=L, kl=0; When the DUGI configuration module and the UDGI configuration module ^! The length of the search T1+T2 is configured as U, then kl+k2=L.

11. The apparatus of claim 9, wherein, when the configuration number _N DUCJI DUGI and _N U∞I UDGI number 1 and a ^ is the frame length, to the OFDM T _Re represents an integral multiple of the other frame The length of the remaining resources outside the symbol in the time domain:

T Frame

Remain = T Frame ¹ OFDM ~ LI

τ OFDM

Where L" represents a downward rounding operation, L is a positive integer greater than zero, and N _DUGI and N _UDGI are positive integers greater than or equal to 1;

The DUGI configuration module configures the length of T1 to be D/N, and then kl=L/N _DUGI .

' DUGI

K2=0;

When the UDGI configuration module configures the length of T2 to ^T ^ / _N , then k2=L/N _U∞I ,

/ 1, UDGI

Kl=0;

When the DUGI configuration module and the UDGI configuration module configure the length of N _DUGI *T1+ N _UDGI *T2 to T _R -, then N _DUGI *kl+ N _UDGI *k2=L.